I am starting to look into Enterprise Java and the book I am following mentions that it will use JBoss. Netbeans ships with Glassfish. I have used Tomcat in the past.

What are the differences between these three programs?

What is the difference between Tomcat, JBoss and Glassfish?

I am seeing the following (truncated) stacktrace in the server.log file of JBoss 7.1.1 Final:

    Caused by: org.postgresql.util.PSQLException: 
    ERROR: current transaction is aborted, commands ignored until end of 
    transaction block

	at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
	at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
	at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:512)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:374)
	at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:302)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_23]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [rt.jar:1.6.0_23]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [rt.jar:1.6.0_23]
	at java.lang.reflect.Method.invoke(Method.java:597) [rt.jar:1.6.0_23]
	at org.postgresql.ds.jdbc23.AbstractJdbc23PooledConnection$StatementHandler.invoke(AbstractJdbc23PooledConnection.java:455)
	at $Proxy49.executeUpdate(Unknown Source)	at org.jboss.jca.adapters.jdbc.WrappedStatement.executeUpdate(WrappedStatement.java:371)
	at org.infinispan.loaders.jdbc.TableManipulation.executeUpdateSql(TableManipulation.java:154) [infinispan-cachestore-jdbc-5.1.2.FINAL.jar:5.1.2.FINAL]
	... 154 more

Inspecting the Postgres log file reveals the following statements:

    STATEMENT:  SELECT count(*) FROM ISPN_MIXED_BINARY_TABLE_configCache
    ERROR:  current transaction is aborted, commands ignored until end of transaction block
    STATEMENT:  CREATE TABLE ISPN_MIXED_BINARY_TABLE_configCache(ID_COLUMN VARCHAR(255) NOT NULL, DATA_COLUMN BYTEA, TIMESTAMP_COLUMN BIGINT, PRIMARY KEY (ID_COLUMN))
    ERROR:  relation &quot;ispn_mixed_binary_table_configcache&quot; does not exist at character 22

I am using the Infinispan shipped with JBoss 7.1.1 Final, which is 5.1.2.Final.

So this is what I think is happening:

 - Infinispan attempts to run the `SELECT count(*)...` statement in order to see if there are any records in the `ISPN_MIXED_BINARY_TABLE_configCache`;
 - Postgres, for some reason, does not like this statement.
 - Infinispan ignores this and plows ahead with the `CREATE TABLE` statement.
 - Postgres barfs because it still thinks it&#39;s the same transaction, which Infinispan has failed to roll back, and this transaction is shafted from the first `SELECT count(*)...` statement.

What does this error mean and any idea how to work around it?


PSQLException: current transaction is aborted, commands ignored until end of transaction block

I was told I can add the `-XX:+HeapDumpOnOutOfMemoryError` parameter to my JVM start up options to my JBoss start up script to get a heap dump when we get an out of memory error in our application.  I was wondering where this data gets dumped?  Is it just to the console, or to some log file?  If it&#39;s just to the console, what if I&#39;m not logged into the Unix server through the console?


Using HeapDumpOnOutOfMemoryError parameter for heap dump for JBoss

TL;DR

What are the steps to configure a HA-JNDI service with a HornetQ setup? I believe the documentation is a little scattered. I have read through the docs [here][1] but doesn&#39;t seem to illustrate in detail.

Longer version:

So we have a HornetQ JMS setup along with JNDI. We have say 5 servers, that run the HornetQ JMS primary instance with JNDI service on each. On each of these 5 servers, we also have a secondary instance running for some other HornetQ primary instance. 

To illustrate:

    Server A - HornetQa_primary, JNDI, HornetQb_secondary
    Server B - HornetQb_primary, JNDI, HornetQc_secondary
    Server C - HornetQc_primary, JNDI, HornetQd_secondary
    Server D - HornetQd_primary, JNDI, HornetQe_secondary
    Server E - HornetQe_primary, JNDI, HornetQa_secondary

Each of these HornetQ servers serve as middleware for our various backend needs, so that means 5 servers, 5 HornetQ primary instances, 5 HornetQ secondary instances and 5 JNDI servers. The problem, however, with this setup is that if a server host (not just the process, the host itself), say A goes down, ideally the service should fallback to the HornetQ running on server E which hosts A&#39;s HornetQ secondary. However, to resume as HornetQ primary, the HornetQa_secondary needs to talk to the JNDI process running on server A (I presume to replicate messages). Since the host A is itself down, the HornetQa_secondary running on E has no way to talk to the JNDI on A, and thus, cannot resume as the primary process. 

Had the JNDI service been highly available, the secondary HornetQ process could resume as primary as expected. Can anyone point to the docs or illustrate in simple steps how we could convert our existing setup to a HA-JNDI? For what it&#39;s worth, I have read multiple [sources][1], but it doesn&#39;t seem to illustrate in much detail about how to get going with configuring a HA-JNDI. Please let me know if you need more info about our current setup.

  [1]: https://docs.jboss.org/jbossclustering/cluster_guide/5.1/html/clustering-jndi.html#clustering-jndi-jboss

Steps to make an existing JNDI HornetQ service as HA?

I have a JPA entity with a property set as 

    @ManyToOne
    @Column(name=&quot;LicenseeFK&quot;)
    private Licensee licensee;

But when I deploy on JBoss 6 the application throws an error saying: 

    org.hibernate.AnnotationException: @Column(s) not allowed on a @ManyToOne property

I use Hibernate 3.5 as the JPA 2.0 implementation.

What should I use to reference the foreign key column?

@Column(s) not allowed on a @ManyToOne property

This will appear to be the age old question (which it is :)) that which server is better between Tomcat and JBoss, but I have not found a good enough answer yet to solve my problem.

I know that Tomcat is only a servlet engine and JBoss offers many more functionalities out of the box, but what I fail to understand is why Tomcat is better to use in some situations than jboss.
I read somewhere that JBoss has a pluggable architecture and if required, you can unplug features from JBoss to make it essentially a tomcat servlet container. If that is the case, then isn&#39;t it better to do so instead of using Tomcat, in order to leave scope for plugging things back.

Another explanation I find in favour of Tomcat is that it is lightweight, does that mean less memory requirement or does that also allows faster response. Again, I need to know that won&#39;t jboss load components as per requirement i.e. if i am using only servlets, then won&#39;t jboss skip the rest of the features and become lightweight automatically.

Essentially, my application does not have any Java EE features, but the &#39;lightweight&#39; arguments in favour of Tomcat does not sound convincing enough because of the above mentioned reasons. 

Please help.

Edit: We had finally decided to use tomcat back then and we have been using it for more than 6 months now with great ease of use. Infact we found some practical use where we could very easily run multiple tomcat instances on the same server machine for different developers, the same could have been very difficult with jboss. 

I have found tomcat to be hassle free for our work and therefore may be the right choice when you are not using much of Java EE features.
PS: Please note that we still use Spring and Hibernate with Tomcat

JBoss vs Tomcat again

If you started a new Java EE project today which is to be finished in about a year, which application server would you choose and why?

Part of your answer should include your arguments for your decision. And also how much experience you have with the Java EE server you choose and with the other available servers on the market. These are interesting as we all get a sense of the investigation and thought that was put into your answer.

Would you, at present date, use JBoss or Glassfish (or another) as Java EE server for a new project?

I&#39;m new to JBoss, and have found a lot of different terminology - JBoss EAP, JBoss Server, Wildfly, Jboss Web, and a lot of documentation that is either not up to date or targeted at an older version.

Where do I start learning about JBoss as a Java EE application server, running against the most current build?

What is the difference between JBoss EAP, Wildfly, JBoss web, and JBoss server?

I generated a web-service client using JBoss utils (JAX-WS compatible)
using Eclipse &#39;web service client from a wsdl&#39;.

So, the only thing I provided was a url to a web-service WSDL.

Now, the web service provider tells me to change the &quot;url of client endpoint application access&quot; of the web-service.

What is it and how to change it?

How to change webservice url endpoint?

I am writing a simple web application to call a stored procedure and retrieve some data.
Its a very simple application, which interacts with client&#39;s database. We pass employee id and company id and the stored procedure will return employee details.

Web application cannot update/delete data and is using SQL Server.

I am deploying my web application in Jboss AS. Should I use JPA to access the stored procedure or `CallableStatement`. Any advantage of using JPA in this case.

Also what will be the sql statement to call this stored procedure. I have never used stored procedures before and I am struggling with this one. Google was not much of a help.

Here is the stored procedure:

    CREATE procedure getEmployeeDetails (@employeeId int, @companyId int)
    as
    begin
        select firstName, 
               lastName, 
               gender, 
               address
          from employee et
         where et.employeeId = @employeeId
           and et.companyId = @companyId
    end

Update:

For anyone else having problem calling stored procedure using *JPA*.

    Query query = em.createNativeQuery(&quot;{call getEmployeeDetails(?,?)}&quot;,
                                       EmployeeDetails.class)			
                                       .setParameter(1, employeeId)
                                       .setParameter(2, companyId);
    
    List&lt;EmployeeDetails&gt; result = query.getResultList();

Things I have noticed:

1. Parameter names didn&#39;t work for me, so try using parameter index.
2. Correct sql statement `{call sp_name(?,?)}` instead of  `call sp_name(?,?)`
3. If stored procedure is returning a result set, even if you know with only one row, `getSingleResult` wont work
4. Pass a `resultSetMapping` name or result class details

How to call a stored procedure from Java and JPA

I&#39;ve just finished re-installing my OS, and as always install and test standard tools which I use, and now I get this error like never before when I tried to start Jboss 5 from eclipse, its quite big exeption :

    3:53:10,693 ERROR [AbstractKernelController] Error installing to Instantiated: name=AttachmentStore state=Described
    java.lang.IllegalArgumentException: Wrong arguments. new for target java.lang.reflect.Constructor expected=[java.net.URI] actual=[java.io.File]
    	at org.jboss.reflect.plugins.introspection.ReflectionUtils.handleErrors(ReflectionUtils.java:395)
    	at org.jboss.reflect.plugins.introspection.ReflectionUtils.newInstance(ReflectionUtils.java:153)
    	at org.jboss.reflect.plugins.introspection.ReflectConstructorInfoImpl.newInstance(ReflectConstructorInfoImpl.java:106)
    	at org.jboss.joinpoint.plugins.BasicConstructorJoinPoint.dispatch(BasicConstructorJoinPoint.java:80)
    	at org.jboss.aop.microcontainer.integration.AOPConstructorJoinpoint.createTarget(AOPConstructorJoinpoint.java:282)
    	at org.jboss.aop.microcontainer.integration.AOPConstructorJoinpoint.dispatch(AOPConstructorJoinpoint.java:103)
    	at org.jboss.kernel.plugins.dependency.KernelControllerContextAction$JoinpointDispatchWrapper.execute(KernelControllerContextAction.java:241)
    	at org.jboss.kernel.plugins.dependency.ExecutionWrapper.execute(ExecutionWrapper.java:47)
    	at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchExecutionWrapper(KernelControllerContextAction.java:109)
    	at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchJoinPoint(KernelControllerContextAction.java:70)
    	at org.jboss.kernel.plugins.dependency.InstantiateAction.installActionInternal(InstantiateAction.java:66)
    	at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:54)
    	at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:42)
    	at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62)
    	at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71)
    	at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51)
    	at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
    	at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
    	at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
    	at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
    	at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
    	at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:774)
    	at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:540)
    	at org.jboss.kernel.plugins.deployment.AbstractKernelDeployer.deployBean(AbstractKernelDeployer.java:319)
    	at org.jboss.kernel.plugins.deployment.AbstractKernelDeployer.deployBeans(AbstractKernelDeployer.java:297)
    	at org.jboss.kernel.plugins.deployment.AbstractKernelDeployer.deploy(AbstractKernelDeployer.java:130)
    	at org.jboss.kernel.plugins.deployment.BasicKernelDeployer.deploy(BasicKernelDeployer.java:76)
    	at org.jboss.bootstrap.microcontainer.TempBasicXMLDeployer.deploy(TempBasicXMLDeployer.java:91)
    	at org.jboss.bootstrap.microcontainer.TempBasicXMLDeployer.deploy(TempBasicXMLDeployer.java:161)
    	at org.jboss.bootstrap.microcontainer.ServerImpl.doStart(ServerImpl.java:138)
    	at org.jboss.bootstrap.AbstractServerImpl.start(AbstractServerImpl.java:450)
    	at org.jboss.Main.boot(Main.java:221)
    	at org.jboss.Main$1.run(Main.java:556)
    	at java.lang.Thread.run(Thread.java:619)
    Failed to boot JBoss:
    java.lang.IllegalStateException: Incompletely deployed:
    
    DEPLOYMENTS IN ERROR:
      Deployment &quot;AttachmentStore&quot; is in error due to: java.lang.IllegalArgumentException: Wrong arguments. new for target java.lang.reflect.Constructor expected=[java.net.URI] actual=[java.io.File]
    
    DEPLOYMENTS MISSING DEPENDENCIES:
      Deployment &quot;ProfileServiceBootstrap&quot; is missing the following dependencies:
        Dependency &quot;ProfileService&quot; (should be in state &quot;Installed&quot;, but is actually in state &quot;Instantiated&quot;)
        Dependency &quot;jboss.kernel:service=Kernel&quot; (should be in state &quot;Installed&quot;, but is actually in state &quot;**ERROR**&quot;)
      Deployment &quot;ProfileServiceDeployer&quot; is missing the following dependencies:
        Dependency &quot;AttachmentStore&quot; (should be in state &quot;Installed&quot;, but is actually in state &quot;**ERROR**&quot;)
      Deployment &quot;ProfileService&quot; is missing the following dependencies:
        Dependency &quot;ProfileServiceDeployer&quot; (should be in state &quot;Installed&quot;, but is actually in state &quot;Instantiated&quot;)
        Dependency &quot;jboss.kernel:service=KernelController&quot; (should be in state &quot;Installed&quot;, but is actually in state &quot;**ERROR**&quot;)
      Deployment &quot;ProfileServicePersistenceDeployer&quot; is missing the following dependencies:
        Dependency &quot;AttachmentStore&quot; (should be in state &quot;Installed&quot;, but is actually in state &quot;**ERROR**&quot;)
    
    	at org.jboss.kernel.plugins.deployment.AbstractKernelDeployer.internalValidate(AbstractKernelDeployer.java:278)
    	at org.jboss.kernel.plugins.deployment.AbstractKernelDeployer.validate(AbstractKernelDeployer.java:174)
    	at org.jboss.bootstrap.microcontainer.ServerImpl.doStart(ServerImpl.java:142)
    	at org.jboss.bootstrap.AbstractServerImpl.start(AbstractServerImpl.java:450)
    	at org.jboss.Main.boot(Main.java:221)
    	at org.jboss.Main$1.run(Main.java:556)
    	at java.lang.Thread.run(Thread.java:619)
    23:53:11,600 INFO  [ServerImpl] Runtime shutdown hook called, forceHalt: true
    23:53:11,615 INFO  [ServerImpl] Shutdown complete 

Did anyone had the similar problem before?I&#39;ve never encountered it so far

Error starting jboss server

I&#39;ve developed a Docker based application comprised of multiple microservices. It has to consume Amazon SQS messages and processes them. At first I wanted to use AWS Elastic Beanstalk, but then I fell over the EC2 Container Service. Now I don&#39;t know which one to choose.

As of now, Elastic Beanstalk supports Multi-Container-Environments. That&#39;s great because every microservice has its own application server inside a docker container. The next problem is scaling:

I don&#39;t know how the scaling mechanism works. For example: I have 5 docker containers in my Elastic Beanstalk Environment. Now only the fifth docker container is under heavy load, because it has a huge amount of SQS messages to process, the other four are nearly idle, because they don&#39;t need much CPU or maybe don&#39;t have a lot of SQS messages. Let&#39;s assume the 5th container runs a JBoss application server. As far as i know, the server only can consume a limited amount of parallel requests even if there is enough CPU/memory available.

If the JBoss Docker container isn&#39;t able to handle the amount of requests, but there is enough CPU/memory available, of course I want to automatically start a second Docker/JBoss container on the same instance. But what happens, if I don&#39;t have enough CPU/memory? Of course I want to spin on a second instance, which is configurable through a auto-scaling group in EB. Now a second instance spins up, but every container except of the 5th is nearly idle, of course I don&#39;t want them to spawn 4 unnecessary at the second instance too, which would be a waste of resources. Only the 5th should spawn and the others should scale like the 5th scale based on configurable parameters like e.g.: CPU/memory/SQS. 

I don&#39;t exactly know if Amazon ECS is doing that, or if it&#39;s possible at all, but I really can&#39;t find any source on the internet about this topic, which is in general said, scaling based on instances/containers.

Should I use AWS Elastic Beanstalk or the Amazon EC2 Container Service (ECS) to scale Docker containers?

I have done considerable research in internet and I haven&#39;t found any easy explanation what to do with `BOM` files with Maven.

The problem is that I use JBoss 7.1.1 and I want to include all JBoss client jars in `pom.xml`. JBoss has a manual that says that I should use BOM files, but I don&#39;t know how to use it in my `pom.xml`.

Please help.

How to use BOM file with Maven?

I noticed that in my JBoss Application Server 7 installation under `standalone/tmp` I have 400 MB of files related to past deployments, some of them a few months old.

How is it cleaned up? Should it happen automatically? Is there a tool for it? Can I just remove all those files myself?

JBoss AS 7: How to clean up tmp?

An answer to a question I read today suggested deploying an application as an exploded (unzipped) [WAR][1]. It got me thinking.

Every deployment I&#39;ve ever done to a JBoss/Tomcat has been with a a WAR/[EAR][2] file. At least as far as I can remember.

Have I been making a mistake all these years?

Are there advantages to deploying an app in its expanded form rather than packaged up?


  [1]: https://en.wikipedia.org/wiki/WAR_(file_format)
  [2]: https://en.wikipedia.org/wiki/EAR_(file_format)

Advantages/Disadvantages to exploded WAR files

How do you configure JBoss to debug an application in Eclipse?

JBoss debugging in Eclipse

I just started JAVA EE development with WildFly 8.2. My first problem is how to change the default port 8080 to something else?

I found many xml files containing below line.

    &lt;socket-binding name=&quot;http&quot; port=&quot;${jboss.http.port:8080}&quot;/&gt;

but I guess I don&#39;t have to change all of them?!


How to change default port 8080 in WildFly

I&#39;d like to make a picture of what are the possible cases for effective involvement of AOP in application design. All I have met so far is:

* logging-related
* security checks
* transaction management
* tweaking of a legacy application

Anything else?


(It doesn&#39;t have to be necessarily Spring&#39;s proxy based AOP - rather JBoss AOP.)

([Related question](https://stackoverflow.com/questions/2155936/how-to-introduce-aop-into-productive-software-development))

What are the possible AOP use cases?

I have a hibernate and JSF2 application going to the deployment server and suddenly throwing an org.hibernate.AssertionFailure: null id in exception. I will provide the stack trace and code immediately but here are four important issues first: 

1. This happens only on the deployment server (Jboss &amp; MySql running on Windows Sever 2008.) It does not happen on my development machine (Tomcat and MySql running on Windoes 7 Pro) and also not on the staging environment (Jboss and MySql running on Linux.) 

2. Researching this, it seems that people get this error when trying to insert an object. But I get the error when I&#39;m doing a simple query. (various different queries, actually, as the error pops up on several pages randomly.) 

3. The error hits only every now and then. If I do a Jboss restart it goes away, but a time later returns. Also, it&#39;s not consistent, on some clicks it&#39;s there, on others it&#39;s not. Even when it hits, when I do a simple refresh of the page it returns fine. 

4. I&#39;m using c3p0 (config below)

Any idea what&#39;s going on? 

The code details: 

This happens on an address object. Here&#39;s the full hbm: 

    &lt;?xml version=&quot;1.0&quot;?&gt;
    &lt;!DOCTYPE hibernate-mapping PUBLIC
	&quot;-//Hibernate/Hibernate Mapping DTD 3.0//EN&quot;
	&quot;http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd&quot;&gt;
    &lt;hibernate-mapping package=&quot;com.idex.auctions.model&quot;&gt;
    &lt;class name=&quot;Address&quot; table=&quot;address&quot; lazy=&quot;true&quot;&gt;
      &lt;id name=&quot;addressID&quot; column=&quot;AddressID&quot;&gt;
            &lt;generator class=&quot;native&quot;/&gt;            
      &lt;/id&gt;
      
      &lt;property name=&quot;street&quot; column=&quot;street&quot;/&gt; 
      &lt;property name=&quot;city&quot; column=&quot;city&quot;/&gt; 
      &lt;property name=&quot;zip&quot; column=&quot;zip&quot;/&gt; 
      &lt;property name=&quot;state&quot; column=&quot;state&quot;/&gt; 
      &lt;property name=&quot;region&quot; column=&quot;region&quot;/&gt; 
      &lt;property name=&quot;country&quot; column=&quot;country&quot;/&gt; 

      &lt;many-to-one name=&quot;user&quot; 
           class=&quot;com.idex.auctions.model.User&quot; 
           column=&quot;userid&quot; 
           unique=&quot;true&quot; 
           cascade=&quot;save-update&quot;/&gt;
     &lt;/class&gt; 
    &lt;/hibernate-mapping&gt;

The Java class is straight forward: 

    public class Address implements Serializable {
    private static final long serialVersionUID = 7485582614444496906L;

    private long addressID;
    private String street;
    private String city;
    private String zip;
    private String state;
    private String region;
    private String country;
    private User user;
    
    public Address() {
    	
    }
	public long getAddressID() {
		return addressID;
	}
	public void setAddressID(long addressID) {
		this.addressID = addressID;
	}
	public String getStreet() {
		return street;
	}
	public void setStreet(String street) {
		this.street = street;
	}
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public String getZip() {
		return zip;
	}
	public void setZip(String zip) {
		this.zip = zip;
	}
	public String getState() {
		return state;
	}
	public void setState(String state) {
		this.state = state;
	}
	public String getRegion() {
		return region;
	}
	public void setRegion(String region) {
		this.region = region;
	}
	public String getCountry() {
		return country;
	}
	public void setCountry(String country) {
		this.country = country;
	}
	public User getUser() {
		return user;
	}
	public void setUser(User user) {
		this.user = user;
	}

    }

The c3p0 configuration: 

	&lt;property name=&quot;hibernate.c3p0.acquire_increment&quot;&gt;1&lt;/property&gt; 
	&lt;property name=&quot;hibernate.c3p0.idle_test_period&quot;&gt;1000&lt;/property&gt; 
	&lt;property name=&quot;hibernate.c3p0.max_size&quot;&gt;20&lt;/property&gt;  
	&lt;property name=&quot;hibernate.c3p0.min_size&quot;&gt;5&lt;/property&gt;
	&lt;property name=&quot;hibernate.c3p0.timeout&quot;&gt;1800&lt;/property&gt;
	&lt;property name=&quot;hibernate.c3p0.max_statements&quot;&gt;0&lt;/property&gt;
	&lt;property name=&quot;connection.provider_class&quot;&gt;org.hibernate.connection.C3P0ConnectionProvider&lt;/property&gt;

The versions used are

    hibernate3.jar

    c3p0-0.9.1.2.jar

    myfaces-api-2.1.4.jar

    myfaces-impl-2.1.4.jar

    mysql-connector-java-5.1.20-bin.jar


The full stacktrace 

    org.hibernate.AssertionFailure: null id in com.idex.auctions.model.Address entry 
        (don&#39;t flush the Session after an exception occurs)
    org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(
                                              DefaultFlushEntityEventListener.java:78)
    org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(
                                              DefaultFlushEntityEventListener.java:187)
    org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(
                                              DefaultFlushEntityEventListener.java:143)
    org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(
                                              AbstractFlushingEventListener.java:219)
    org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(
                                              AbstractFlushingEventListener.java:99)
    org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(
                                              DefaultAutoFlushEventListener.java:58)
    org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:997)
    org.hibernate.impl.SessionImpl.list(SessionImpl.java:1142)
    org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
    com.idex.auctions.manager.DatabaseManager.getAllObjects(DatabaseManager.java:464)
    com.idex.auctions.ui.NavBean.gotoHome(NavBean.java:40)
    sun.reflect.GeneratedMethodAccessor350.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:735)
    javax.el.BeanELResolver.invoke(BeanELResolver.java:467)
    javax.el.CompositeELResolver.invoke(CompositeELResolver.java:246)
    org.apache.el.parser.AstValue.getValue(AstValue.java:159)
    org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
    org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.getValue(
                                              ContextAwareTagValueExpression.java:96)
    javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:246)
    javax.faces.component.UIOutcomeTarget.getOutcome(UIOutcomeTarget.java:50)
    org.apache.myfaces.shared.renderkit.html.HtmlRendererUtils.getOutcomeTargetHref(
                                              HtmlRendererUtils.java:1542)
    org.apache.myfaces.shared.renderkit.html.HtmlLinkRendererBase.renderOutcomeLinkStart(
                                              HtmlLinkRendererBase.java:908)
    org.apache.myfaces.shared.renderkit.html.HtmlLinkRendererBase.encodeBegin(
                                              HtmlLinkRendererBase.java:143)
    javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:502)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:744)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:758)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:758)
    org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(
                                        FaceletViewDeclarationLanguage.java:1900)
    org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:285)
    com.ocpsoft.pretty.faces.application.PrettyViewHandler.renderView(
                                        PrettyViewHandler.java:163)
    javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:59)
    org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView(
                                        ResourceViewHandlerWrapper.java:93)
    com.idex.auctions.ui.CustomViewHandler.renderView(CustomViewHandler.java:98)
    org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:115)
    org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:241)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:199)
    com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:126)
    com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118)

org.hibernate.AssertionFailure: null id in entry (don&#39;t flush the Session after an exception occurs)

I would like to specify the root context of my Java web application in my WAR file. How can I do this using valid `web-app` XML in a `web.xml` file?

Oh, yes I would like to do this in an application server agnostic way.

How do you specify the root context in your &lt;web-app&gt; tags in web.xml?

What is the Difference between `standalone.xml` and `standalone-full.xml`. In what scenarios we use `standalone-full.xml`

Difference between standalone.xml and standalone-full.xml

Some times whenever I restart the application, which is built on 
Java
Struts
Mysql and Jboss 4.05 Version
I get the error as **Address already in use: JVM_Bind**

Only fix that i know is to restart the machine and try again, it will work.
Else Some times I do Ctrl-Alt-Del and Stop all the process related to Java, some times this also works.

But what is the exact reason and how can we prevent this problem ?


Address already in use: JVM_Bind java

I am trying to enable TLS 1.2 in my web app which uses JBoss 6.4 and Java 1.7. I have `-Dhttp.protocols = TLSv1.2` in my application environment but it doesn&#39;t seem to work for me. 

Is there anything I could do to enable TLS 1.2?

I wrote a simple program 

    context = SSLContext.getInstance(&quot;TLSv1.2&quot;);
    context.init(null,null,null);
    SSLContext.setDefault(context); 
    SSLSocketFactory factory = (SSLSocketFactory)context.getSocketFactory();
    SSLSocket socket = (SSLSocket)factory.createSocket();
    protocols = socket.getEnabledProtocols();

After running this program within the app the TLS 1.2 gets enabled. I do not want to run this program but I want to directly enable it during app startup. Is there any way to do it?


How to enable TLS 1.2 in Java 7

I am developing a Java EE application that I deploy over and over again on a local JBoss installation during development. I want to speed up the build by hot deploying my application straight into [JBOSS]/server/default/deploy/myApp

It seems to work - but there also seems to be a somewhat arbitrary delay between the hard deploy and when JBoss starts using the new classes. I am not very familiar with JBoss, but I assume it caches classes, and that this is what causes the problem. 

Am I correct, and if so, how do I make JBoss flush it&#39;s cache?

Hot deploy on JBoss - how do I make JBoss &quot;see&quot; the change?

My application below communicates as a client on a JBoss 7.2.0 system to a receiver JNDI/JMS on a JBoss 4.2.1 system.  It creates a Send Queue and a Receive Queue.  We have been running just fine for 2 months straight with this configuration; no changes were made to either side.  The local client app has the 4.2.1 jbossall-client.jar and jnp-client.jars installed.

After normal activity, we start receiving a `org.jboss.mq.SpyJMSException: Exiting on IOE; - nested throwable: (java.io.EOFException) at org.jboss.mq.SpyJMSException.getAsJMSException(SpyJMSException.java:72)` exception.

We restarted JBoss 7.2.0 without changing anything, and when we are establishing the receive queue, we are now receiving a `org.jboss.mq.SpyJMSException: Cannot subscribe to this Destination: ; {...} Caused by: java.io.EOFException` exception thrown from our code at `QueueReceiver receiver = session.createReceiver(queue);`.  We also start throwing this same exception after the app has been running fine for days, but without activity over a multi-day period of time.

We had the 4.2.1 system restarted to see if that was the problem, but that fixed nothing.  **In fact, we can replicate this failure scenario by having both systems connect as normal, then recycle the 4.2.1 system.**  The errors start throwing once the 4.2.1 system is down, and the 7.2.0 system continues to fail to re-establish the connections once the 4.2.1 system is fully established (even when it SHOULD be capable of doing so).

Stopping then starting the app in JBoss does not fix this.  Restarting JBoss has a 20% chance of fixing this (100% chance in the case of the forced failure scenario cited above).  Undeploying, then redeploying the application usually fixes this.

**What might be causing this?**

This same war file works fine on our test system, which has an identical JBoss set-up.  Communication with the target JBoss system via a test app from the command prompt using the same code works fine.

I suspect there is an issue with JBoss 7.2.0 itself, or is this possibly a timeout issue?  How do I check or extend the timeout length; is that something doable from the client side?  Even if it was timeout, I make the call to the `stop()` method before the rest of `start()` re-connects, and I still get the exception; in that scenario, it wouldn&#39;t be a timeout issue as a timeout would have reset.

**Context Values:**

    connectionFactoryName=ConnectionFactory
    contextFactoryName=org.jnp.interfaces.NamingContextFactory
    packagePrefixes=org.jboss.naming:org.jnp.interfaces
    providerUrl=MYSERVER:1099

**Java Code:**

	private ContextContainer contextContainer = null;
	private QueueConnection connection = null;
	private QueueReceiver receiver = null;
	private Queue sendQueue = null;
	private Queue receiveQueue = null;
    private String sendQueueName = null;
    private String receiveQueueName = null;
	private MessageHandler messageHandler = null;

	protected synchronized void start() throws Exception {
		
        // NOTE: This position also has delay code (for pending multiple 
        // consecutive recycling requests), with an external method to 
        // reset the delay. It was removed for code clarity and has no 
        // effect on the issue being discussed.

		// Clear prior Connection
		stop();

		logger.info(&quot;Regenerating JMS for : &quot; + this.getClass().getName());

		Context context = this.contextContainer.getContext();
		
		logger.info(&quot;Looking up factory : &quot; + contextContainer.getConnectionFactoryName());

		QueueConnectionFactory connectionFactory = (QueueConnectionFactory)context.lookup(contextContainer.getConnectionFactoryName()); 

		// ESTABLISH SEND MESSAGE QUEUE
		logger.info(&quot;Looking up send queue : &quot; + sendQueueName);

		sendQueue = (Queue)context.lookup(sendQueueName); 
		
		logger.info(&quot;Send Queue string : &quot; + sendQueue);
		logger.info(&quot;Send Queue name   : &quot; + sendQueue.getQueueName());
		logger.info(&quot;Creating Queue Connection&quot;);

		connection = connectionFactory.createQueueConnection();
		
		logger.info(&quot;Setting Exception Listener&quot;);

		connection.setExceptionListener(new ExceptionListener() {

			public void onException(JMSException ex) {

				logger.error(&quot;JMS Exception received on QueueConnection&quot;, ex);

				start();
			}
		});

		// ESTABLISH RECEIVE MESSAGE QUEUE
		logger.info(&quot;Looking up receive queue : &quot; + receiveQueueName);
			
		receiveQueue = (Queue)context.lookup(receiveQueueName); 
			
		logger.info(&quot;Receive Queue string : &quot; + receiveQueue);
		logger.info(&quot;Receive Queue name   : &quot; + receiveQueue.getQueueName());
		logger.info(&quot;Creating JMS Session for Receiving&quot;);
	
		QueueSession session = connection.createQueueSession(false, Session.CLIENT_ACKNOWLEDGE);
			
		logger.info(&quot;Created Session &quot; + session);		
		logger.info(&quot;Creating JMS Receiver for Queue \&quot;&quot; + receiveQueue.getQueueName() + &quot;\&quot;&quot;);

        // THIS IS THE LINE WHERE THE EXCEPTION IS THROWN!!!
		receiver = session.createReceiver(receiveQueue);
	
		logger.info(&quot;Setting Message Listener&quot;);
	
		receiver.setMessageListener(new MessageListener() {
	
			public void onMessage(Message message) {
	
				try {
	
					if (message instanceof ObjectMessage) {
							
						Object obj = ((ObjectMessage) message).getObject();
							
                        //  UNRELATED METHOD FOR HANDLING THE MESSAGE
						handleMessage(obj);
							
					} else {
			
						throw new Exception(&quot;Received message of unexpected type &quot; + message.getJMSType() + &quot;, was expecting ObjectMessage&quot;);
					}
						
				} catch (Exception ex) {
						
					logger.error(&quot;Error processing incoming message.&quot;, ex);
						
				} finally {
			
					try {
						
						message.acknowledge();
						logger.info(&quot;Acknowledged message.&quot;);
							
					} catch (Exception ex) {
	
						logger.error(&quot;Unable to acknowledge message.&quot;, ex);
					}
				}
			}
		});
		
		logger.info(&quot;Starting Queue Connection&quot;);

		connection.start();

		logger.info(&quot;Started Queue Connection&quot;);
	}	

	/**
	 * Extinguish the existing connection.
	 */
	public synchronized void stop() {
		
		if (receiver != null) {
		
			try {
				
				logger.info(&quot;Nullifying Receiver Listener&quot;);
				receiver.setMessageListener(null);
				logger.info(&quot;Nullified Receiver Listener&quot;);
				
			} catch(Exception ex) {
				
				logger.warn(&quot;Exception nullifying Receiver Listener&quot;, ex);
			}
			
			try {
				
				logger.info(&quot;Closing Receiver&quot;);
				receiver.close();
				logger.info(&quot;Closed Receiver&quot;);
				
			} catch(Exception ex) {
				
				logger.warn(&quot;Exception closing Receiver&quot;, ex);

			} finally {
			
				receiver = null;
			}			
		}

		if (connection != null) {

			try {

				logger.info(&quot;Nullifying Exception Listener&quot;);
				connection.setExceptionListener(null);
				logger.info(&quot;Nullified Exception Listener&quot;);

			} catch (Exception ex) {

				logger.warn(&quot;Exception nullifying Exception Listener&quot;, ex);
			}

			try {

				logger.info(&quot;Stopping Queue Connection&quot;);
				connection.stop();
				logger.info(&quot;Stopped Queue Connection&quot;);

			} catch (Exception ex) {

				logger.warn(&quot;Exception stopping Queue Connection&quot;, ex);
			}

			try {

				logger.info(&quot;Closing Queue Connection&quot;);
				connection.close();
				logger.info(&quot;Closed Queue Connection&quot;);

			} catch (Exception ex) {

				logger.warn(&quot;Exception closing Queue Connection&quot;, ex);

			} finally {

				connection = null;
			}
		}
	}

**Log Output:**

	Setting Context Factory Class: org.jnp.interfaces.NamingContextFactory
	Setting Package Prefixes: org.jboss.naming:org.jnp.interfaces
	Setting Provider URL: MYSERVER:1099
	Generating JMS for : MYPACKAGE.ConnectionHandler
	Looking up factory : ConnectionFactory
	Looking up send queue : queue/sendQueue
	Send Queue string : QUEUE.sendQueue
	Send Queue name   : sendQueue
	Creating Queue Connection
	Setting Exception Listener
	Looking up receive queue : queue/receiveQueue
	Receive Queue string : QUEUE.receiveQueue
	Receive Queue name   : receiveQueue
	Creating JMS Session for Receiving
	Created Session SpySession@1903462020[tx=false ack=CLIENT txid=null RUNNING connection=Connection@1963631553[token=ConnectionToken:ID:273725/9966a9625bb094d33a37f72db71b3bb9 rcvstate=STOPPED]]
	Creating JMS Receiver for Queue &quot;receiveQueue&quot;
	Exception caught during initialization.
	org.jboss.mq.SpyJMSException: Cannot subscribe to this Destination: ; - nested throwable: (java.io.EOFException)

**Exception trace after normal activity:**

    JMS Exception received on QueueConnection
    org.jboss.mq.SpyJMSException: Exiting on IOE; - nested throwable: (java.io.EOFException)
	at org.jboss.mq.SpyJMSException.getAsJMSException(SpyJMSException.java:72)
	at org.jboss.mq.Connection.asynchFailure(Connection.java:423)
	at org.jboss.mq.il.uil2.UILClientILService.asynchFailure(UILClientILService.java:174)
	at org.jboss.mq.il.uil2.SocketManager$ReadTask.handleStop(SocketManager.java:439)
	at org.jboss.mq.il.uil2.SocketManager$ReadTask.run(SocketManager.java:371)
	at java.lang.Thread.run(Thread.java:744)
    Caused by: java.io.EOFException
	at java.io.ObjectInputStream$BlockDataInputStream.readByte(ObjectInputStream.java:2766)
	at java.io.ObjectInputStream.readByte(ObjectInputStream.java:916)
	at org.jboss.mq.il.uil2.SocketManager$ReadTask.run(SocketManager.java:316)
	... 1 more

**Exception trace after restart:**

	org.jboss.mq.SpyJMSException: Cannot subscribe to this Destination: ; - nested throwable: (java.io.EOFException)
		at org.jboss.mq.SpyJMSException.getAsJMSException(SpyJMSException.java:72)
		at org.jboss.mq.SpyJMSException.rethrowAsJMSException(SpyJMSException.java:57)
		at org.jboss.mq.Connection.addConsumer(Connection.java:800)
		at org.jboss.mq.SpySession.addConsumer(SpySession.java:947)
		at org.jboss.mq.SpySession.createReceiver(SpySession.java:658)
		at org.jboss.mq.SpyQueueSession.createReceiver(SpyQueueSession.java)
		at org.jboss.mq.SpySession.createReceiver(SpySession.java:647)
		at org.jboss.mq.SpyQueueSession.createReceiver(SpyQueueSession.java)
		at MYPACKAGE.ConnectionHandler.start(ConnectionHandler.java:144)
		at MYPACKAGE.ConnectionHandler.initialize(ConnectionHandler.java:60)
		at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
		at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
		at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.lang.reflect.Method.invoke(Method.java:606)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1414)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1375)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
		at java.security.AccessController.doPrivileged(Native Method)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
		at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
		at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
		at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
		at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
		at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
		at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
		at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
		at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
		at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
		at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
		at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
		at org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:3339)
		at org.apache.catalina.core.StandardContext.start(StandardContext.java:3777)
		at org.jboss.as.web.deployment.WebDeploymentService.doStart(WebDeploymentService.java:156)
		at org.jboss.as.web.deployment.WebDeploymentService.access$000(WebDeploymentService.java:60)
		at org.jboss.as.web.deployment.WebDeploymentService$1.run(WebDeploymentService.java:93)
		at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
		at java.util.concurrent.FutureTask.run(FutureTask.java:262)
		at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
		at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
		at java.lang.Thread.run(Thread.java:744)
		at org.jboss.threads.JBossThread.run(JBossThread.java:122)
	Caused by: java.io.EOFException
		at java.io.ObjectInputStream$BlockDataInputStream.readByte(ObjectInputStream.java:2766)
		at java.io.ObjectInputStream.readByte(ObjectInputStream.java:916)
		at org.jboss.mq.il.uil2.SocketManager$ReadTask.run(SocketManager.java:316)
		at java.lang.Thread.run(Thread.java:744)


Why are SpyJMSExceptions still thrown after recycling the client JBoss connection to remote queues?

I cannot start keycloak container using ansible and docker-compose. I&#39;am getting error: User with username &#39;admin&#39; already added to &#39;/opt/jboss/keycloak/standalone/configuration/keycloak-add-user.json&#39;

I have 3 ansible jobs:

Create netwrok:

```
- name: Create a internal network
  docker_network:
    name: internal
```

Setup postgres:

```
- name: &quot;Install Postgres&quot;
  docker_compose:
    project_name: posgressdb
    restarted: true
    pull: yes
    definition:
      version: &#39;2&#39;
      services:
        postgres:
          image: postgres:12.1
          container_name: postgres
          restart: always
          env_file:
            - /etc/app/db.env
          networks:
            - internal
          volumes:
            - postgres-data:/var/lib/postgresql/data
            - /etc/app/createdb.sh:/docker-entrypoint-initdb.d/init-app-db.sh
          ports:
            - &quot;5432:5432&quot;
      volumes:
        postgres-data:
      networks:
        internal:
          external:
            name: internal
```

Create keycloak container:

```
- name: Install keycloak
  docker_compose:
    project_name: appauth
    restarted: true
    pull: yes
    definition:
      version: &#39;2&#39;
      services:
        keycloak:
          image: jboss/keycloak:8.0.1
          container_name: keycloak
          restart: always
          environment:
            - DB_VENDOR=POSTGRES
            - DB_ADDR=postgres
            - DB_PORT=5432
            - DB_SCHEMA=public
            - DB_DATABASE=keycloak
            - DB_USER=keycloak
            - DB_PASSWORD=keycloak
            - KEYCLOAK_USER=admin
            - KEYCLOAK_PASSWORD=admin
          networks:
            - internal
      networks:
        internal:
          external:
            name: internal

```

Does anyone have any idea why I get this error?

**EDIT**

If I downgrade keycloak to version 7 it starts normally!

Keycloak 8: User with username &#39;admin&#39; already added

I have the following structure in a Java Web Application:

    TheProject
      -- [Web Pages]
      -- -- [WEB-INF]
      -- -- -- abc.txt
      -- -- index.jsp
      -- [Source Packages]
      -- -- [wservices]
      -- -- -- WS.java

In `WS.java`, I am using the following code in a Web Method:

    InputStream fstream = this.getClass().getResourceAsStream(&quot;abc.txt&quot;);

But it is always returning a null.  I need to read from that file, and I read that if you put the files in `WEB-INF`, you can access them with `getResourceAsStream`, yet the method is always returning a `null`.

Any ideas of what I may be doing wrong?

Btw, the strange thing is that this was working, but after I performed a `Clean and Build` on the Project, it suddenly stopped working :/

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