Exploded jar file not a directory

fordfrog · **Joined:** Thu Nov 24, 2005 8:48 am **Posts:** 10

Hello,

I am trying to use <jar-file> tag in persistence.xml file to instruct EntityManagerFactory to include the classes from this library. I use Tomcat. Unfortunately I cannot manage it to work.

I use this syntax:
<jar-file>core.jar</jar-file>

core.jar is my library and it is located in web/WEB-INF/lib.

This is what JarVisitor says:

Code:

19:10:29,728 DEBUG JarVisitor:178 - Searching mapped entities in jar/par: file:core.jar
19:10:29,729  WARN ExplodedJarVisitor:30 - Exploded jar file not a directory (ignored): file:core.jar

Here is the content of the jar file:

Code:

$ jar tf core.jar
META-INF/
META-INF/MANIFEST.MF
cz/
cz/startnet/
cz/startnet/logic/
cz/startnet/logic/settings/
cz/startnet/logic/settings/SettingsItem.class
cz/startnet/logic/settings/SettingsItemValue.class
cz/startnet/logic/settings/SettingsModule.class

What am I doing wrong?

fordfrog · **Joined:** Thu Nov 24, 2005 8:48 am **Posts:** 10

So I have debugged the hibernate entity manager code and have found two things:

1) The only way I can be sure the file will be loaded is to provide full path to the file (this is IMHO not portable to other systems) because in my case relative path begins at /opt/tomcat5.5/shared/lib which is definitely not the path of the context I work in. It would be greate if hibernate could search also the classpath of current context when running in Tomcat.

2) In JarVisitor.getVisitor() there is no checking whether the specified file exists which is very confusing. Simple check like 'file.exists()' would be very helpful for debugging why things don't work.

Code:

   public static final JarVisitor getVisitor(String jarPath, Filter[] filters) throws IllegalArgumentException {
      File file = new File( jarPath );
      if ( file.isFile() ) {
         return new InputStreamZippedJarVisitor( jarPath, filters );
      }
      else {
         return new ExplodedJarVisitor( jarPath, filters );
      }
   }

I wanted to check the latest code from cvs whether it is already solved but I cannot find any info about cvs access to the hibernate sources.

emmanuel · **Posted:** Wed Nov 30, 2005 6:21 am

Open a JIRA issue for the debugging enhancement.
<jar-file> is considered portable in an EJB3 container, not outside. There is no reasong why this jar would be in the CP as per the WAR spec.

fordfrog · **Joined:** Thu Nov 24, 2005 8:48 am **Posts:** 10

So what would be the correct way to include jar file? In my case when developing I have the path:

Code:

/home/user/src/project/build/web/WEB-INF/lib/core.jar

When the project will be deployed on a production server, it might be in:

Code:

/var/lib/tomcat-5/default/webapps/project/WEB-INF/lib/core.jar

or

Code:

/opt/tomcat5.5/webapps/servlets-examples/WEB-INF/lib/core.jar

or

Code:

C:\somepath\...

on Windows.

So in my case the core.jar file is placed in /context/WEB-INF/lib/core.jar but hibernate searches relative path from /opt/tomcat5.5/shared/lib.

I cannot specify absolute path to the core.jar file because it won't work in all these possible environments. If I specify relative path, it won't work either. The only thing I know is where the file is placed in my context but I don't know how to specify in the persistence.xml that EMF should search the directory WEB-INF/lib in my context and not /opt/tomcat5.5/shared/lib.

Quote:

<jar-file> is considered portable in an EJB3 container, not outside.

Could you please explain me how can I set portable path to the jar file in my case? I am very new to java, hibernate and Tomcat so I might be missing something important that prevents me from understanding it.

Thank you for your help.

emmanuel · **Posted:** Wed Nov 30, 2005 1:07 pm

tomcat is not an EJB3 container, so don't expect to find a good way to set jar-file

You can try JBoss EJB3 Embeddable to embed an EJB3 container inside Tomcat however.

fordfrog · **Joined:** Thu Nov 24, 2005 8:48 am **Posts:** 10

Now I understand. Thank you.

paulkneeland · **Joined:** Tue Jan 17, 2006 1:10 am **Posts:** 1

I am also interested in using external jar files without the need to specify the full path. I am running a swing app from a webstart connection. Is there a good way to do this, without repackaging the classes into my par? Can I place the jar file into my par archive somewhere?