For those of you deploying Liferay DXP to WebLogic, you will need to add an override property to your portal-ext.properties file to allow the WebLogic JAXB implementation to peer inside the OSGi environment to create proxy instances.

I know, it's a mouthful, but it's all pretty darn technical. You'll know if you need this if you start seeing exceptions like:

java.lang.NoClassDefFoundError: org/eclipse/persistence/internal/jaxb/WrappedValue
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
	at org.eclipse.persistence.internal.jaxb.JaxbClassLoader.generateClass(JaxbClassLoader.java:124)
	at org.eclipse.persistence.jaxb.compiler.MappingsGenerator.generateWrapperClass(MappingsGenerator.java:3302)
	Truncated. see log file for complete stacktrace
Caused By: java.lang.ClassNotFoundException: org.eclipse.persistence.internal.jaxb.WrappedValue cannot be found by com.example.bundle_1.0.0
	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:444)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:357)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:349)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	Truncated. see log file for complete stacktrace

Suffice it to say that you need to override the module.framework.properties.org.osgi.framework.bootdelegation property to add the following two lines:

  org.eclipse.persistence.internal.jaxb,\
  org.eclipse.persistence.internal.jaxb.*,\

You have to include all of the packages from the value defined in portal.properties, so my entry actually looks like:

module.framework.properties.org.osgi.framework.bootdelegation=\
  __redirected,\
  com.liferay.aspectj,\
  com.liferay.aspectj.*,\
  com.liferay.portal.servlet.delegate,\
  com.liferay.portal.servlet.delegate*,\
  com.sun.ccpp,\
  com.sun.ccpp.*,\
  com.sun.crypto.*,\
  com.sun.image.*,\
  com.sun.jmx.*,\
  com.sun.jna,\
  com.sun.jndi.*,\
  com.sun.mail.*,\
  com.sun.management.*,\
  com.sun.media.*,\
  com.sun.msv.*,\
  com.sun.org.*,\
  com.sun.syndication,\
  com.sun.tools.*,\
  com.sun.xml.*,\
  com.yourkit.*,\
  org.eclipse.persistence.internal.jaxb,\
  org.eclipse.persistence.internal.jaxb.*,\
  sun.*

Enjoy