MapGenerator: NullPointerException in ReflectedComponent

mnuhoglu · **Posted:** Tue Apr 06, 2004 7:58 am

Hi,

I have a problem when using MapGenerator. I run:

Code:

java MapGenerator --output=Musteri.hbm.xml satis.Musteri

The trace of the exception:

Code:

java.lang.NullPointerException
   at net.sf.hibernate.tool.class2hbm.ReflectedComponent.getXMLas(ReflectedComponent.java:120)
   at net.sf.hibernate.tool.class2hbm.ReflectedComponent.getXML(ReflectedComponent.java:107)
   at net.sf.hibernate.tool.class2hbm.ReflectedClass.getXMLasSubclass(ReflectedClass.java:187)
   at net.sf.hibernate.tool.class2hbm.ReflectedClass.getXML(ReflectedClass.java:159)
   at net.sf.hibernate.tool.class2hbm.MapGenerator.getXML(MapGenerator.java:490)
   at net.sf.hibernate.tool.class2hbm.MapGenerator.writeXML(MapGenerator.java:139)
   at net.sf.hibernate.tool.class2hbm.MapGenerator.main(MapGenerator.java:134)
   at util.CodeGenerator.main(CodeGenerator.java:25)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:324)
   at com.intellij.rt.execution.application.AppMain.main(Unknown Source)

I debugged the code, the null pointer occurs there:

Code:

   private void getXMLas( int level, boolean isComposite ) {
      if( component != null ) {
         Integer x = (Integer )map.cycleBuster.get( component );

cycleBuster is a null reference.

Does anybody know, why might cycleBuster be null? Or do you have any other suggestion?

Thanks...

david · **Posted:** Tue Apr 06, 2004 6:41 pm

MapGenerator / class2hbm is not the best tool to use. XDoclet is the primary candidate to use to generate mapping documents from POJOs (classes). It allows appropriate detail to be added to the java file so decent HBMs can be created from it.

If you can come up with a simple example then submit it to JIRA and someone will have a look at it.