I am upgrading an old WLS8.1 app to 10.3 (11g) My ant build includes only the new weblogic.jar in the compile classpath and the build runs with no issues but when I include weblogic.jar as a libeary in the IDE (Intellij) i see many unresolved imports (for example: weblogic.xml.xpath.DOMXPath) when I check the weblogic.jar I see that the classes are indeed missing from it. compiling with verbose revealed that by including weblogic.jar in the ant classpath, many other jars in the BEA_HOME/modules are loaded to the classpath as well (for example: com.bea.core.xml.weblogic.xpath_1.4.0.0.jar) Can anyone explain what is going on? How can I fix my IDE classpath - do I need to import all the module-jars? Many of the module jars seems like they are there to support old deprecated weblogic 8 APIs (like: weblogic.xml.xpath.DOMXPath) how can I exclude these modules from my ant build? (I want to expose the APIs I need to upgrade) Thanks, NY