Ant - How to create a runnable jar of jars and classes

[Mark Moge]

I am trying to create a runnable jar of jars and classes.
In my build.xml file I have

<manifest file="MANIFEST.MF">       
    <attribute name="Main-Class" value="com.corporate.cotp.CRMBRMMiddleware"/>	 
</manifest>

After creating new jar it consist of *.class and *.jar files and if I want to run it I have an error

Could not find the main class: com.corporate.cotp.CRMBRMMiddleware.

I saw that Eclipse adds to the manifest file

Rsrc-Class-Path: ./ log4j-1.2.16.jar pcmext.jar  pcm.jar sapjco3.jar
Class-Path: .
Rsrc-Main-Class: com.corporate.cotp.CRMBRMMiddleware
Main-Class: org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader

and the jar has classes from org.eclipse.jdt.internal.jarinjarloader package

JIJConstants.class
JarRsrcLoader$ManifestInfo.class
JarRsrcLoader.class
RsrcURLConnection.class
RsrcURLStreamHandler.class
RsrcURLStreamHandlerFactory.class

If I add classes from org.eclipse.jdt.internal.jarinjarloader and update Manifest as above I can run my jar (but it's not a clean job). Can you tell me how can I do it without using classes from eclipse package?

[James Sabre]

e.g.

       <jar basedir="${classes}" jarfile="myexecutable.jar">
            <include name="**/*.class"/>
            <manifest>
                <attribute name="Built-By" value="Mark Moge"/>
                <attribute name="Main-Class" value="com.corporate.cotp.CRMBRMMiddleware"/>
                <attribute name="Class-Path" value="a space separated list of library jars"/>
            </manifest>
        </jar>

[Mark Moge]

After that i have an exception

run:
     [echo] Run the jar file
     [java] java.lang.NoClassDefFoundError: com/portal/pcm/EBufException
     [java] Caused by: java.lang.ClassNotFoundException: com.portal.pcm.EBufException
     [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
     [java]     at java.security.AccessController.doPrivileged(Native Method)
     [java]     at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     [java]     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
     [java] Could not find the main class: com.corporate.cotp.CRMBRMMiddleware.
Program will exit.
     [java] Exception in thread "main"
     [java] Java Result: 1

[James Sabre]

Run
jar -tf your-jar-file.jar
and make sure that the list contains the class com.portal.pcm.EBufException in the directory com/portal/pcm . If it doesn't then you need to modify the 'include' set to make sure it gets included.

[Mark Moge]

James Sabre wrote:Run
jar -tf your-jar-file.jar
and make sure that the list contains the class com.portal.pcm.EBufException in the directory com/portal/pcm . If it doesn't then you need to modify the 'include' set to make sure it gets included.

com.portal.pcm.EBufException is part of pcm.jar and this jar is included.

As I sad If I add to my jar *class files from eclipse and modify manifest as in first post everything works. The exception tells something about URLClassLoader and two classes from eclipse have Loader in a name.

[James Sabre]

Since you are trying to avoid using the Eclipse jar-in-jar class loader you cannot put the jars your main jar needs in the main jar. They need to be external to your main jar and, as I illustrated in my first post, you must define a Class-Path entry in your manifest. The entry is a list of jars separated by spaces.

Assuming that your dependency jar are external to the main jar and in the directory 'lib' relative to your main jar then your Class-Path entry will be

Class-Path : lib/ajar.jar lib/bjar.jar lib/cjar.jar

Obviously replacing ajar.jar bjar.jar etc with names of the jars.

[Mark Moge]

Ok, I can see your point of view and it works. Thanks a lot for solution.