Guava and Weblogic:ClassNotFoundException

Question

I\'m trying to work on a web application that deploys to Weblogic 10.3.5. One of the maven dependencies is Guava.

Unfortunately, upon attempting to publish the proje

Answer 1

• Yes it's classloader issue (application vs. WebLogic classloading)
• guava libraries and com.google.common contains same classes
• WebLogic has com.google.common_1.0.0.0_0-6.jar or com.google.common_1.1.0.0_0-6.jar in it's classpath, in modules directory. (depending on WebLogic version, but the jar content is same, only META-INF\MANIFEST.MF is different)
• You cannot find this library in WebLogic Classloader Analysis Tool (CAT). I'm not sure why is that....
• Why not using WebLogic built in feature with help of FilteringClassLoaders - prefer-application-packages ?

you need to add something like this to your weblogic.xml or weblogic-application.xml if you are in EAR application

<wls:container-descriptor>
    <wls:prefer-application-packages>
            <wls:package-name>com.google.common.*</wls:package-name>
    </wls:prefer-application-packages>
</wls:container-descriptor>

Then redeploy the application.

It works for us.

• pros: no need to replace & rename magic with com.google.common*.jar files... that's a way to suicide...

Hope it helps.

For more info, see the link:
https://www.rational-pi.be/2013/03/guava-and-weblogic12c/

Answer 2

Go to your weblogic folder, weblogic-home >modules and if there is a com.google.common....jar file, just delete it and replace it with a guava.jar file, and you have to rename the guava file with the old com.google.common......jar name (cuz weblogic is looking for this name, but its conflicting with your guava file).

i had the same problem here