[jboss-user] [Javassist user questions] - Inconsistent stack height 0 != 1

[bblfish]

I am getting a weird exception when I add code to the toString method of the following class.
This is code I am working on https://sommer.dev.java.net project. 
My javassist byte code rewritten classes otherwise work well (though I am only now starting to test them in more serious ways).


package net.java.dev.sommer.doap.ont;
  | 
  | import java.io.File;
  | import java.net.URL;
  | import java.util.Collection;
  | import net.java.rdf.annotations.rdf;
  | import net.java.dev.sommer.doap.CheckoutHandler;
  | import static net.java.dev.sommer.doap.ont.DoapProject.doap;
  | 
  | /**
  |  *
  |  * @author hjs
  |  */
  | @rdf(doap+"Repository")
  | public class Repository {
  |     
  |     @rdf(doap+"location") private URL location;
  |     @rdf(doap+"browse") private Collection<URL> browse;
  |     @rdf(doap+"anon-root") private String anonRoot;
  |     @rdf(doap+"name") private String name;
  |     
  |     public CheckoutHandler checkout(File destination) {
  |         throw new UnsupportedOperationException("Not yet implemented");
  |     }
  | 
  |     public String getType() {
  |         return "unknown";
  |     }
  | 
  |     public URL getLocation() {
  |         return location;
  |     }
  | 
  |     public Collection<URL> getBrowse() {
  |         return browse;
  |     }
  | 
  |     public String getAnonRoot() {
  |         return anonRoot;
  |     }
  | 
  |     @Override
  |     public String toString() {
  |         if (name != null) return getType()+" type "+name;
  | //        if (location != null) return getType()+" type at "+location.getPath();
  |         return getType()+" type with no name";
  |     }
  |     
  |     
  | }

The stack trace is the following

java.lang.VerifyError: (class: net/java/dev/sommer/doap/ont/Repository, method: toString signature: ()Ljava/lang/String;) Inconsistent stack height 0 != 1
  |         at java.lang.Class.getDeclaredConstructors0(Native Method)
  |         at java.lang.Class.privateGetDeclaredConstructors(Class.java:2328)
  |         at java.lang.Class.getConstructor0(Class.java:2640)
  |         at java.lang.Class.getConstructor(Class.java:1629)
  |         at net.java.rdf.sommer.SesameMapper.map(SesameMapper.java:989)
  |         at net.java.rdf.sommer.SesameMapper.getCollection(SesameMapper.java:1220)
  |         at net.java.rdf.sommer.util.RDFCollection.getCurrentCollection(RDFCollection.java:113)
  |         at net.java.rdf.sommer.util.RDFCollection.isEmpty(RDFCollection.java:121)
  |         at net.java.dev.sommer.doap.DoapDisplayForm.htmlForProject(DoapDisplayForm.java:222)
  |         at net.java.dev.sommer.doap.DoapDisplayForm.<init>(DoapDisplayForm.java:48)
  |         at net.java.dev.sommer.doap.DoapFetcher.useTheDoapFile(DoapFetcher.java:226)
  |         at net.java.dev.sommer.doap.DoapFetcher.run(DoapFetcher.java:214)
  |         at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
  |         at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
  | [catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
  |         at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
  |         at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
  |         at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
  |         at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
  | 

perhaps I can send the byte code too. I am not sure where I should look to resolve the problem. If I remove the 
code from the toString() everything works fine.

I can dissasemble the byte code with jad, and javap seems to have to trouble with it either.

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