If you are using Hibernate&#39;s proprietary API, you&#39;ll need the `hibernate.cfg.xml`. If you are using JPA i.e. Hibernate EntityManager, you&#39;ll need the `persistence.xml`. 

So you generally don&#39;t need both as you use **either** Hibernate proprietary API or JPA.

However, if you **were using** Hibernate Proprietary API and already have a `hibernate.cfg.xml` (and `hbm.xml` XML mapping files) but want to start using JPA,  you can reuse the existing configuration files by referencing the `hibernate.cfg.xml` in the `persistence.xml` in the `hibernate.ejb.cfgfile` property - and thus have both files. Reusing existing `hbm.xml` files is IMO a realistic scenario that could justify keeping both (even if I&#39;d probably migrate to JPA annotations on the long run).

### References

- Hibernate EntityManager
 - [2.2.2. Bootstrapping][1] 


  [1]: http://docs.jboss.org/hibernate/stable/entitymanager/reference/en/html_single/#setup-configuration-bootstrapping

`hibernate.cfg.xml` is for Hibernate; `persistence.xml` is for JPA.  

If you do Hibernate without JPA, you don&#39;t need the latter.

If you do JPA, you have to have a provider implementation, which means Hibernate, EclipseLink, etc.  (There may be other legit JPA implementations, but I don&#39;t have time to check right now.)


Can anyone please tell me the LIST OF DATATYPES in SQLITE supporting ANDROID.

I want to confirm about TIME and DATE datatypes.

what are Datatypes in SQLite supporting android

I need to make some command line calls to linux and get the return from this, however doing it as below is just returning `0` when it should return a time value, like `00:08:19`, I am testing the exact same call in regular command line and it returns the time value `00:08:19` so I am confused as to what I am doing wrong as I thought this was how to do it in python.

    import os
    retvalue = os.system(&quot;ps -p 2993 -o time --no-headers&quot;)
    print retvalue


Linux command-line call not returning what it should from os.system?

This is my current project structure:

    pom.xml
    /src
      /main
        /resources
          hibernate.cfg.xml
          /META-INF
            persistence.xml

I have very similar configuration params in both files (`hibernate.cfg.xml` and `persistence.xml`), which looks strange, but this is what I saw in many online examples and tutorials. I can&#39;t understand why do I need to have two files. Is it possible to work just with one? Please explain.

ps. For example, should I declare `hibernate.dialect` in both files, or just one will be enough? If so, which one to use?

what is the purpose of two config files for Hibernate?

This is my current project structure:
<pre><code class="hljs language-bash">pom.xml
/src
 /main
 /resources
 hibernate.cfg.xml
 /META-INF
 persistence.xml
</code></pre>
I have very similar configuration params in both files (<code>hibernate.cfg.xml</code> and <code>persistence.xml</code>), which looks strange, but this is what I saw in many online examples and tutorials. I can't understand why do I need to have two files. Is it possible to work just with one? Please explain.
ps. For example, should I declare <code>hibernate.dialect</code> in both files, or just one will be enough? If so, which one to use?

I&#39;m very new to Java EE and I&#39;m trying to understand the concept of Local interfaces and Remote interfaces. I&#39;ve been told that one of the big advantages of Java EE is that it is easy to scale (which I believe means you can deploy different components on different servers). Is that where Remote and Local interfaces come in? Are you supposed to use Remote interfaces if you expect your application to have different components on different servers? And use Local interfaces if your application is only going to reside on one server?

If my assumptions above are correct, how would you go about choosing whether to use Local or Remote interfaces for a new application, where your unsure of what the volume of traffic would be? Start off by using Local interfaces, and gradually upgrade to Remote interfaces where applicable?

Thanks for any clarification and suggestions.


EJB&#39;s - when to use Remote and/or local interfaces?

Just wanted to know if it is possible in Eclipse to sort Maven dependencies by alphabetical order?

It&#39;s bothering me to have a list of 200 jars not ordered... :(

Sort maven dependencies in Eclipse

I am trying to run my project, but Eclipse is saying I have errors. But there are no errors, just a red cross where the project name is. I have tried deleting the R.java and generating a new one, but that didn&#39;t work.

Eclipse shows errors but I can&#39;t find them

Let&#39;s say we have a class:

    public class MyClass {
        @Autowired private AnotherBean anotherBean;
    }

Then we created an object of this class (or some other framework have created the instance of this class).

    MyClass obj = new MyClass();

Is it possible to still inject the dependencies? Something like:

    applicationContext.injectDependencies(obj);

(I think Google Guice has something like this)


How to inject dependencies into a self-instantiated object in Spring?

How do I increment a Integer&#39;s value in Java? I know I can get the value with intValue, and I can set it with new Integer(int i).

    playerID.intValue()++;

does not seem to work.

Note: PlayerID is a Integer that has been created with:

    Integer playerID = new Integer(1);

Increment a Integer&#39;s int value?

I have a database with the following structure:

    CREATE TABLE entity (
        id SERIAL,
        name VARCHAR(255),
        PRIMARY KEY (id)
    );
    
    CREATE TABLE entity_property (
        entity_id SERIAL,
        name VARCHAR(255),
        value TEXT
    );

When I try to create an EntityProperty class

    @Entity
    @Table(name=&quot;entity_property&quot;)
    public class EntityProperty {
    
        private String name;
        private String value;
    
        @Column(name=&quot;name&quot;)
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
    
        @Column(name=&quot;value&quot;, nullable=true, length=255)
        public String getValue() {
            return value;
        }
        public void setValue(String value) {
            this.value = value;
        }
    }

I get the following exception:

    org.hibernate.AnnotationException: No identifier specified for entity: package.EntityProperty

I know that JPA entities must have a primary key but I can&#39;t change the database schema due to reasons that are beyond my control. Is it possible to create JPA (Hibernate) entities that will work with database schema like this? 



JPA entity without id

How would you configure annotations in the following example code? I&#39;d like to stick with JPA annotations only and avoid Hibernate specific dependencies. **Is the code below correct?**

    @Entity
    public class RefExample extends RefData {
    	
    }

(There will be multiple versions of these classes, RefSomeOtherExample, etc, and one db table per class. Some may add additional fields (columns) but most will simply make use of the basic fields inherited from the &quot;RefData&quot; base class.)

Base class:

    @Entity
    public abstract class RefData {
    	
    	private long id;
    	private String code;
    	private String desc;
    	
    	@Id
    	@GeneratedValue(strategy = GenerationType.IDENTITY)
    	@Column(unique = true, nullable = false)
    	public long getId() {
    	
    		return id;
    	}
    	
    	public void setId(long id) {
    	
    		this.id = id;
    	}
    	
    	@Column(unique = true, nullable = false, length=8)
    	public String getCode() {
    	
    		return code;
    	}
    	
    	public void setCode(String code) {
    	
    		this.code = code;
    	}
    	
    	@Column(unique = true, nullable = false, length=80)
    	public String getDesc() {
    	
    		return desc;
    	}
    	
    	public void setDesc(String desc) {
    	
    		this.desc = desc;
    	}
    }

Ultimately I&#39;d like to generate schema creation scripts from this using Hibernate&#39;s SchemaExport class.  In the case above these two classes should only result in the creation of a single table named &quot;RefExample&quot; with the three columns from &quot;RefData&quot;. Will this work?

Inherited abstract class with JPA (+Hibernate)

What is the difference between JTA, JPA and plain JDBC in terms of Hibernate?

Difference between JTA, JPA and plain JDBC in hibernate

I have a one-to-many relation between Parent and Child table.  In the parent object I have a 

    List&lt;Child&gt; setChildren(List&lt;Child&gt; childs)

I also have a foreign key in the Child table. This foreign key is an ID that references a Parent row in database.  So in my database configuration this foreign key can not be NULL.
Also this foreign key is the primary key in the Parent table.

So my question is how I can automatically save the children objects by doing something like this:

    session.save(parent);

I tried the above but I&#39;m getting a database error complaining that the foreign key field  in the Child table can not be NULL. Is there a way to tell JPA to automatically set this foreign key into the Child object so it can automatically save children objects?

Thanks in advance.

Save child objects automatically using JPA Hibernate

I am having an issue in setting up a one to many relationship in my annotated object.

I have the following:

    @MappedSuperclass
    public abstract class MappedModel
    {
    	@Id
    	@GeneratedValue(strategy=GenerationType.AUTO)
    	@Column(name=&quot;id&quot;,nullable=false,unique=true)
    	private Long mId;

then this

    @Entity
    @Table(name=&quot;customer&quot;)
    public class Customer extends MappedModel implements Serializable
    {
    
    	/**
       * 
       */
      private static final long serialVersionUID = -2543425088717298236L;
    
    
      /** The collection of stores. */
    	@OneToMany(mappedBy = &quot;customer&quot;, cascade = CascadeType.ALL, fetch = FetchType.LAZY)
      private Collection&lt;Store&gt; stores;

and this

    @Entity
    @Table(name=&quot;store&quot;)
    public class Store extends MappedModel implements Serializable
    {
    
    	/**
       * 
       */
      private static final long serialVersionUID = -9017650847571487336L;
    
      /** many stores have a single customer **/
      @ManyToOne(fetch = FetchType.LAZY)
      @JoinColumn (name=&quot;customer_id&quot;,referencedColumnName=&quot;id&quot;,nullable=false,unique=true)
      private Customer mCustomer;

what am i doing incorrect here

mappedBy reference an unknown target entity property

Maven: How to change path to target directory from command line?

(I want to use another target directory in some cases)

Maven: How to change path to target directory from command line?

Here&#39;s my generic problem:

My project P depends on A which depends on B which depends on C which depends on version 1.0.1 of D. 

There&#39;s a problem with version 1.0.1 of D and I want to force the use of another module. I don&#39;t know how to declare this in my project&#39;s POMs since I haven&#39;t added a dependency on D directly. It&#39;s C which declared the dependency on D.

Important: In this case, not only the version is changed, but the group &amp; artifact as well. So it&#39;s not just a matter of overriding the version of the dependency, but rather, of excluding a module and including another one. 


In the concrete case, D is StAX whose 1.0.1 has a [bug][1]. According to the notes in the bug, &quot;the problems were solved by replacing the stax-api-1.0.1 (maven GroupId = stax) by stax-api-1.0-2 (maven GroupId = javax.xml.stream)&quot; so I&#39;m trying just that.

Thus, D = stax:stax-api:jar:1.0.1 and C = org.apache.xmlbeans:xmlbeans:jar:2.3.0


I&#39;m using maven 2.0.9 in case it matters.


Output of mvn dependency:tree&quot;

    mvn dependency:tree
    [..snip..]
    [INFO] +- org.apache.poi:poi-ooxml:jar:3.6:compile
    [INFO] |  +- org.apache.poi:poi-ooxml-schemas:jar:3.6:compile
    [INFO] |  |  +- org.apache.xmlbeans:xmlbeans:jar:2.3.0:compile
    [INFO] |  |  |  \- stax:stax-api:jar:1.0.1:compile


In my project&#39;s POM I have the following dependency on &quot;A&quot;:


    &lt;dependency&gt;
        &lt;groupId&gt;org.apache.poi&lt;/groupId&gt;
        &lt;artifactId&gt;poi&lt;/artifactId&gt;
        &lt;version&gt;3.6&lt;/version&gt;
    &lt;/dependency&gt;
    &lt;dependency&gt;
        &lt;groupId&gt;org.apache.poi&lt;/groupId&gt;
        &lt;artifactId&gt;poi-ooxml&lt;/artifactId&gt;
        &lt;version&gt;3.6&lt;/version&gt;
    &lt;/dependency&gt;


  [1]: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6402423

Maven: how to override the dependency added by a library

I&#39;m new to Maven, coming from the Ant world.

Is it possible to list all of the possible goals (including, say, all the plugins) that you can run?

I can see that there used to be a `-g` flag in Maven 1, but this isn&#39;t available in version 2.

List all of the possible goals in Maven 2?

I am trying to find a way to copy a resource file to a new name in the target directory in a Maven build. Pretty much everything I have found while searching suggests workarounds involving multiple sub-directories in `/src/main/resources` and selecting among them via profiles. However, in my case, this does not solve the problem, namely that the file I want has a &quot;magic&quot; name.

Basically what I want to do is have a `/src/main/resources/default.DS_Store` file get copied to `${project.build.directory}/.DS_Store`. Since the `.DS_Store` file has special meaning in Mac OSX, it is not desirable to have a file with that name in the source tree, and in version control. However, I do want the data in the file to be in the source tree and version control, and have it renamed to the &quot;magic&quot; name during the build.

I&#39;m starting to think that ant is the only way to do this automatically. Is there any easier way?

Content Type	Original Author	Original Content on Stackoverflow
Question	yegor256	View Question on Stackoverflow
Solution 1 - Java	Pascal Thivent	View Answer on Stackoverflow
Solution 2 - Java	duffymo	View Answer on Stackoverflow

what is the purpose of two config files for Hibernate?

Java Problem Overview

Java Solutions

Solution 1 - Java

References

Solution 2 - Java

Linux command-line call not returning what it should from os.system?

what are Datatypes in SQLite supporting android

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