Unable to resolve setting of dependent jar file in ear

Hi,
I have an .ear file which as an ejb.jar and dependent.jar file. Now i set the classpath in MANIFEST.MF of ejb.jar and tried to deploy in weblogic server7.0 but my ejb is not able to identity my dependent.jar its throwing class not found error. I even tried setting up classpath even @ my MANIFEST.MF of ear also. still not able to resolve.
So let me know does dependent.jar in ear is suppoted are not?

Hello Sanjay,
This should work without any problems. Can you provide your manifest.mf file?
Meanwhile, refer to the following link for more documentation about WebLogic classloading
and how to specify a manifest.mf file to do what you're trying to achieve:
http://edocs.bea.com/wls/docs70/programming/classloading.html#1073491
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Sanjay <[email protected]> wrote:
Hi,
I have an .ear file which as an ejb.jar and dependent.jar file. Now
i set the classpath in MANIFEST.MF of ejb.jar and tried to deploy in
weblogic server7.0 but my ejb is not able to identity my dependent.jar
its throwing class not found error. I even tried setting up classpath
even @ my MANIFEST.MF of ear also. still not able to resolve.
So let me know does dependent.jar in ear is suppoted are not?

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Hello Sanjay,
This should work without any problems. Can you provide your manifest.mf file?
Meanwhile, refer to the following link for more documentation about WebLogic classloading
and how to specify a manifest.mf file to do what you're trying to achieve:
http://edocs.bea.com/wls/docs70/programming/classloading.html#1073491
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Sanjay <[email protected]> wrote:
Hi,
I have an .ear file which as an ejb.jar and dependent.jar file. Now
i set the classpath in MANIFEST.MF of ejb.jar and tried to deploy in
weblogic server7.0 but my ejb is not able to identity my dependent.jar
its throwing class not found error. I even tried setting up classpath
even @ my MANIFEST.MF of ear also. still not able to resolve.
So let me know does dependent.jar in ear is suppoted are not?

Why so many dependent jar files?

Crystal Report needs too many dependent jar file. What is the alternative way to minimize dependent jar files or club together as one jar?
Thanks,
Venkat

If you're using the Java Reporting Component (JRC), then I recommend upgrading to the newest version - [Crystal Reports For Eclipse 2.0|https://www.sdn.sap.com/irj/boc/crystalreports-java], where the number of jars are significantly decreased.
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Sincerely,
Ted Ueda

How to share dependant jars across rars & ears / avoid classcast exceptions

How can one share dependant jars between a ear application and a resource adapter and avoid getting a ClassCastException? 

In some appservers(such as Oracle) the resource adapter is the parent of your ear classloader, so a single instance multiple classloader problem doesn't occur. But in some appservers such as BEA Weblogic this isn't the case. Not sure why BEA decided to make resource adapter class loader seperate and not the parent of ear loader...

If I bundle the resource adapter specific classes in the corresponding module archive file, I will get a class cast exception, becos I will have a single instance and multiple class loader situation (assuming resource adapters uses its own classloader).

Second question related to the above: Web logic documentation recommends that we bundle the common files in APP-INF direcotory for embedded resource adapter apps. If I start bundling the resource adapter in an ear file, for every ear app we will have a rar bundled. What about the JNDI names? won't you have to rename the resource adapter differently for each ear so that there is no jndi name clash? Doesn't this defeat the purpose of having one common connector for all apps?

Here is a detailed description of what I want:
Let say you have a ear file. Let's say there is a common.jar shared between your ear application (say the ejb module uses it), and your resource adapter.

In the case of Oracle's OC4J I can see there won't be any problem of having this common.jar part of the resource adapter(RA). When the RA class loader loads the rar, it makes sure the common.jar files are accessible in the chain of all class loaders it is a parent of. So, the ear loader, ejb loader etc...will have visibility -> hence no class cast exception.

But what do clients do when they want to have their ear deployable across multiple appservers not just oc4j. BEA recently changed their class loader structure...their resource loader is no longer parent of the ear, so the ejb app in the ear doesn't have visibility into common.jar packaged with rar. So, the only solution was to bundle the common.jar file with the ear. But this causes problems, because we can have a situation where certain object instances (that are not serialized or copied) can be shared across class loaders. This ends up in the single instance multiple class loader situation->hence classcastexception.

The only solution I found was to make the common.jar file a shared library. That way only one copy of the class files are there for both the rar and the ear and its visibility is there not only for rar but for ear since it is loaded by the system class loader or shared library class loader (if ther eis one such).

Please convey best practise recommendation.
Sudhakar

Pete <[email protected]> wrote:
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Dimitri

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======================================
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> </module>
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Hi.
Please open a case with support.
Regards,
Michael
Rick Holland wrote:
I have an ear containing two ejb jars, one webapp war and a utility jar
(common.jar). Deploying to
WebLogic 6.1 sp2 results in deployment errors because WebLogic thinks
the common.jar in a
lib directory in the ear is an ejb jar:
==================================================================
<Apr 22, 2002 4:42:36 PM MDT> <Error> <J2EE> <Error deploying
application lib/common:
Unable to deploy EJB: lib/common.jar from lib/common.jar:
An error occurred while reading the deployment descriptor. The error was:
java.io.FileNotFoundException: META-INF/ejb-jar.xml not found in jar file
at weblogic.ejb20.dd.xml.DDUtils.getEntry(DDUtils.java:332)
at weblogic.ejb20.dd.xml.DDUtils.getEjbJarXml(DDUtils.java:236)
===================================================================Why does it think common.jar contains an EJB? My application.xml is:
<application>
<display-name>TestUnit</display-name>
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<ejb>TestUnit2.jar</ejb>
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<module>
<web>
<web-uri>WebApp1.war</web-uri>
<context-root>WebApp1</context-root>
</web>
</module>
</application>
Michael Young
Developer Relations Engineer
BEA Support

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ear:
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util.jar
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Unable to resolve setting of dependent jar file in ear

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