Since the number 4 (four in _English_) is a homonym for the preposition `for`, it&#39;s being used to indicate that the library is `for Java`.

In .NET, libraries are sometimes prefixed with `n` to indicate that they are the .NET variant.  For instance, Java has Hibernate and .NET has nHibernate.  You also have cases where Java follows this &quot;convention&quot; such as jUnit (where .NET has nUnit).

As a beginning developer I, too, was confused by the 4j naming convention.  I thought it was some kind of version indicator until I noticed several libraries carrying the suffix.

Maybe now a Google search will turn up a meaningful result for &quot;4j&quot; :)

EDIT:

I&#39;ve been unable to find the origin of the 4j suffix, but my _best guess_ would be that it started with [log4j][1] which now has [variants][2] such as log4net, log4php, log4cxx.


  [1]: http://en.wikipedia.org/wiki/Log4j
  [2]: http://logging.apache.org/

I&#39;d guess it means &quot;for java&quot;

On this page [slf4j][1] it even says 

&gt; The Simple Logging Facade for Java or (SLF4J)


  [1]: http://www.slf4j.org/

It is an abbreviation for &#39;for Java&#39;.

4j ~ for Java. And I&#39;m only writing more text because SO answers require a minimum of 15 characters, which is hardly to reach with an answer for this question - which should be community wiki anyway, to my opinion, even though it&#39;s legal and I guess, a lot more people just read this acronym without thinking about what it might stand for. ;)

But at least it&#39;s an opportunity to remind the community of a famous answer, given by [ammoQ][1], on [MasterPeter&#39;s][2] now closed and deleted subjective question &quot;Did Java steal away the fun from programming?&quot;:

&gt; Don&#39;t put the blame on Java; it&#39;s the
&gt; abundance of frameworks that make a
&gt; java developer cry. You can&#39;t even
&gt; poop without using the **Poop4J**
&gt; framework.

(Question can still be found in [google&#39;s cache][3])


  [1]: https://stackoverflow.com/users/65464/ammoq
  [2]: https://stackoverflow.com/users/81520/masterpeter
  [3]: http://209.85.229.132/search?q=cache:NYsBtzWwShYJ:stackoverflow.com/questions/1700859/did-java-steal-away-the-fun-from-programming/1700947+site:stackoverflow.com/questions+poop4j&amp;cd=1&amp;hl=en&amp;ct=clnk

I&#39;ve a class like this:

    public class PersonViewModel : ViewModelBase //Here is the INotifyPropertyChanged Stuff
    {
        public PersonViewModel(Person person)
        {
            PersonEntity = person;
        }

        public Person PersonEntity { 
            get { return PersonEntity.Name; }
            private set { PersonEntity.Name = value; RaisePropertyChanged(&quot;PersonEntity&quot;);
        }

        public string Name { 
            get { return PersonEntity.Name; }
            set { PersonEntity.Name = value; RaisePropertyChanged(&quot;Name&quot;);
        } 
        public int Age{ 
            get { return PersonEntity.Age; }
            set { PersonEntity.Age= value; RaisePropertyChanged(&quot;Age&quot;);
        } 

        public void ChangePerson(Person newPerson)
        {
            //Some Validation..
            PersonEntity = newPerson;
        }

My TextBoxes are bound to Name and Age of the ViewModel.
If I change the _person object in the ViewModel, do I have to call for each Property a RaisePropertyChanged again or is there a way to do this automaticly (in my concret example I have about 15 Properties..)?

Thanks for any help.

Cheers
Joseph

C#/WPF: PropertyChanged for all Properties in ViewModel?

I have 3 tables called:

- Applications (id, name)
- Resources  (id, name)
- ApplicationsResources (id, app_id, resource_id)

I want to show on a GUI a table of all resource names. In one cell in each row I would like to list out all of the applications (comma separated) of that resource.

So the question is, what is the best way to do this in SQL as I need to get all resources and I also need to get all applications for each resource?

Do I run a select * from resources first and then loop through each resource and do a separate query per resource to get the list of applications for that resource?

Is there a way I can do this in one query?

How do I create a comma-separated list using a SQL query?

I notice a number of java libraries use this as a suffix:

    log4j, couchdb4j, neo4j, launch4j, etc..

What does 4j mean?

<p>I notice a number of java libraries use this as a suffix:</p>
<pre><code class="hljs">log4j, couchdb4j, neo4j, launch4j, etc..
</code></pre>


I have some code-under-test that calls on a Java logger to report its status.
In the JUnit test code, I would like to verify that the correct log entry was made in this logger. Something along the following lines:

    methodUnderTest(bool x){
        if(x)
            logger.info(&quot;x happened&quot;)
    }

    @Test tester(){
        // perhaps setup a logger first.
        methodUnderTest(true);
        assertXXXXXX(loggedLevel(),Level.INFO);
    }

I suppose that this could be done with a specially adapted logger (or handler, or formatter), but I would prefer to re-use a solution that already exists. (And, to be honest, it is not clear to me how to get at the logRecord from a logger, but suppose that that&#39;s possible.)


How to do a JUnit assert on a message in a logger

I know, there are many different questions and so many answers about this problem... But I can&#39;t understand...

I have: ubuntu-9.10-desktop-amd64 + NetBeans6.7.1 installed &quot;as is&quot; from off. rep.
I need connecting to some site over the HTTPS. For this I use Apache&#39;s HttpClient.

From tutorial I read:

&quot;Once you have JSSE correctly installed, secure HTTP communication over SSL should be as  
 simple as plain HTTP communication.&quot; And some example:

    HttpClient httpclient = new HttpClient();
    GetMethod httpget = new GetMethod(&quot;https://www.verisign.com/&quot;); 
    try { 
      httpclient.executeMethod(httpget);
      System.out.println(httpget.getStatusLine());
    } finally {
      httpget.releaseConnection();
    }

By now, I write this:

    HttpClient client = new HttpClient();

    HttpMethod get = new GetMethod(&quot;https://mms.nw.ru&quot;);
    //get.setDoAuthentication(true);
        
    try {
        int status = client.executeMethod(get);
        System.out.println(status);

        BufferedInputStream is = new BufferedInputStream(get.getResponseBodyAsStream());
        int r=0;byte[] buf = new byte[10];
        while((r = is.read(buf)) &gt; 0) {
            System.out.write(buf,0,r);
        }

    } catch(Exception ex) {
        ex.printStackTrace();
    }

As a result I have a set of errors:

    javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
            at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1627)
            at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:204)
            at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:198)
            at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:994)
            at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:142)
            at sun.security.ssl.Handshaker.processLoop(Handshaker.java:533)
            at sun.security.ssl.Handshaker.process_record(Handshaker.java:471)
            at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:904)
            at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1132)
            at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:643)
            at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:78)
            at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
            at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
            at org.apache.commons.httpclient.HttpConnection.flushRequestOutputStream(HttpConnection.java:828)
            at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2116)
            at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
            at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
            at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
            at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
            at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
            at simpleapachehttp.Main.main(Main.java:41)
    Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:302)
            at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:205)
            at sun.security.validator.Validator.validate(Validator.java:235)
            at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:147)
            at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:230)
            at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:270)
            at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:973)
            ... 17 more
    Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
            at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:191)
            at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:255)
            at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:297)
            ... 23 more

What have I to do to create simplest SSL connection?
(Probably without KeyManager and Trust manager etc. while.)


How to handle invalid SSL certificates with Apache HttpClient?

&gt; **Possible Duplicate:**  
&gt; [Should one call .close() on HttpServletResponse.getOutputStream()/.getWriter()?](https://stackoverflow.com/questions/1159168/should-one-call-close-on-httpservletresponse-getoutputstream-getwriter)  

&lt;!-- End of automatically inserted text --&gt;

Am I responsible for closing the HttpServletResponse.getOutputStream() (or the getWriter() or even the inputstream)
or should I leave it to the container ?


    protected void doGet(HttpServletRequest request, HttpServletResponse response) 
       throws ServletException, IOException {
        OutputStream o = response.getOutputStream();
        ... 
        o.close(); //yes/no ?
    }

Should I close the servlet outputstream?

I am using RESTlet and I have created a resource. I handle POST by overriding `acceptRepresentation` method.

The client should send me some data, then I store it to DB, set response to 201 (SUCCESS_CREATED) and I need to return some data to the client, but return type of `acceptRepresentation` is `void`.

In my case, I need to return some identificator so that client can access that resource.

For example, if I had a resource with URL `/resource` and the client sends POST request I add a new row in DB and its address should be `/resource/{id}`. I need to send `{id}`.

Am I doing something wrong? Does REST principles allow to return something after POST? If yes, how can I do it, and if no what is the way to handle this situation? 

Is it ok by REST to return content after POST?

With PMD, if you want to ignore a specific warning, you can use `// NOPMD` to have that line be ignored.

Is there something similar for FindBugs?

Is there a way to ignore a single FindBugs warning?

With PHP you have the [`phpinfo()`](http://php.net/manual/en/function.phpinfo.php) which lists installed modules and then from there look up what they do.

Is there a way to see what packages/modules are installed to import?

Get available modules

Allergro is an open souce C++ addon library for graphics manipulation. How do I add this library to my compiler?

The instructions don&#39;t work for me as I have Windows 7. I don&#39;t know if the OS matters. I have the Visual Studio Express Edition. The library is a .dll file. How do I add it to my projects?


How to add additional libraries to Visual Studio project?

How do I add local jar files (not yet part of the Maven repository) directly in my project&#39;s library sources?

How to add local jar files to a Maven project?

What is the difference between `.a` `.o` and `.lo` file in C?

Difference between .a .o and .lo file

I have been working on a project (a game to be specific) and I feel that I should start over with different libraries. So when doing this I reinstalled [Code::Blocks](http://codeblocks.org) and setup my new libraries and includes. 

But as of now Im having a problem starting u[ my new project to test if all of the includes work. This problem is: `libstdc++-6.dll was not found.` At first i wondered if I could just find this file online, but its nowhere to be found(or at least the many places I have searched...) Soon after, I tried loading up my old project, and the same problem happened again(wierd... ._.) I was thinking its maybe my compiler, so I used my older compiler and it did the same thing! At this moment I held the problem off for tomorrow(which is today)

So my question is: If anyone else had this problem, how would you solve it?

Im using Code::Blocks with MinGW as the compiler on Windows Vista 32 bit.


*****EDIT*****

Here are the Build options in my project. Note that these are the settings in the Project, not the global compiler:

In (project name)-&gt;Compiler settings-&gt;Otehr options:

(I use `//` to seperate the commands)

    -mthreads//
    -fmessage-length=0//
    -fexceptions//
    -fident//

In (project name)-&gt;Compiler settings-&gt;#define:


    WIN32//
    _WINDOWS//

In (project name)-&gt;Linker settings-&gt;Other linker options:

    -static-libstdc++//
    -static-libgcc//
    -Wl,--enable-auto-image-base//
    -Wl,--add-stdcall-alias//
    -Wl,--enable-auto-import//

In linker-&gt;link libraries i have various links to files with a `.a` extension, these files include Bullet PHysics, Ogre3D, and SFML

In the search directories i have links to the MinGW/bin, and the MinGW/lib directories, along with other links to different libraries.


My Compiler is MinGW, a GNU GCC compiler for windows 32 bit. and the IDE is Codeblocks. Also note that in Debug and Release settings on the project, there is nothing.

Most of these setings are also pieces that i got from the [Ogre3D Application setup tutorial](http://www.ogre3d.org/tikiwiki/Setting+Up+An+Application+-+CodeBlocks) if that is of any help.



Content Type	Original Author	Original Content on Stackoverflow
Question	Verhogen	View Question on Stackoverflow
Solution 1 - Java	Ryan Emerle	View Answer on Stackoverflow
Solution 2 - Java	Neil Foley	View Answer on Stackoverflow
Solution 3 - Java	Galwegian	View Answer on Stackoverflow
Solution 4 - Java	Rakesh Juyal	View Answer on Stackoverflow
Solution 5 - Java	Andreas Dolk	View Answer on Stackoverflow

What does 4j mean?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

Solution 5 - Java

How do I create a comma-separated list using a SQL query?

C#/WPF: PropertyChanged for all Properties in ViewModel?

Attributions