Perm or Metaspace OOME due to many duplicate JaxbAccessor classes

Issue

• We see a perm or metaspace OOME and the heap dump shows many duplicate JaxbAccessor classes (such as com.package.name.Class$$JaxbAccessorF_variablename) in our application classloader.

• The OOME is hit in a call like the following:

  |- at java.lang.OutOfMemoryError.<init>()V (OutOfMemoryError.java:48)
  |- at java.lang.ClassLoader.defineClass1(Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class; (Native Method)
  |- at java.lang.ClassLoader.defineClass(Ljava/lang/String;[BIILjava/security/ProtectionDomain;)Ljava/lang/Class; (ClassLoader.java:760)
  |- at java.lang.ClassLoader.defineClass(Ljava/lang/String;[BII)Ljava/lang/Class; (ClassLoader.java:642)
  |- at sun.reflect.GeneratedMethodAccessor242.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; (Unknown Source)
  |- at sun.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; (DelegatingMethodAccessorImpl.java:43)
  |- at java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; (Method.java:497)
  |- at com.sun.xml.bind.v2.runtime.reflect.opt.Injector.inject(Ljava/lang/String;[B)Ljava/lang/Class; (Injector.java:181)
  |- at com.sun.xml.bind.v2.runtime.reflect.opt.Injector.inject(Ljava/lang/ClassLoader;Ljava/lang/String;[B)Ljava/lang/Class; (Injector.java:85)
  

• Code similar to the following that performs a JAXB XML translation results in endlessly creating new classes:

  StringWriter sw = new StringWriter();
  JAXBContext jaxbContext = JAXBContext.newInstance(myObject.getClass());
  Marshaller marshal = jaxbContext.createMarshaller();
  marshal.marshal(myObject, sw);