Old JaxB and JDK8 Metaspace OutOfMemory Issue

Question

We are working on a business application (1 million+ LOC) developed since 10+ years. While switching to JDK8 we get an issue with the metaspace of JDK8. This seems to be rel

Answer 1

Here is the solution Gary is talking about, which is better than just setting a flag (since even the JAXB guys suggest to make it singleton...)

private static Map<class<?>, JAXBContext> contextStore = new ConcurrentHashMap<class<?>, JAXBContext>();
... 
protected static JAXBContext getContextInstance(Class<?> objectClass) throws JAXBException{
  JAXBContext context = contextStore.get(objectClass);
  if (context==null){
    context = JAXBContext.newInstance(objectClass);
    contextStore.put(objectClass, context);
  }
  return context;
}

//using it like this:
JAXBContext context = getContextInstance(objectClass);

Answer 2

JAXBContext.newInstance() should be used once to create a context for your class to unmarshall. It will use up your permgen or metaspace otherwise.

Answer 3

We solved our current issue untill able to fix all occurances in our application by using the following VM-parameter:

-Dcom.sun.xml.bind.v2.bytecode.ClassTailor.noOptimize=true

I hope this will help others with similar issues...