[Jboss-dev-forums] [Design of AOP on JBoss (Aspects/JBoss)] - javassist.CannotCompileException: duplicate field

[rmcdonough <nu...@jb...>]

I am experienceing weird behavior when I try to compile my aspects. I have an Introduction that will give PropertyChangeSupport to my Hibernate classes.  I'm using this in a Swing app so that I can have a proper JavaBean that will work with the JGoodies Binding framework. So far, my code works using loadtime transformation through Eclipse. However, when I try to compile the classes with AopC, I get this:

[aopc] javassist.CannotCompileException: duplicate field: _com$damnhandy$binding$aspects$ModelMixinImpl$aop$mixin
  |      [aopc] at javassist.bytecode.ClassFile.testExistingField(ClassFile.java:501)
  |      [aopc] at javassist.bytecode.ClassFile.addField(ClassFile.java:484)
  |      [aopc] at javassist.CtClassType.addField(CtClassType.java:836)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.addMixin(Instrumentor.java:240)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.instrumentIntroductions(Instrumentor.java:308)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.transform(Instrumentor.java:640)
  |      [aopc] at org.jboss.aop.AspectManager.translate(AspectManager.java:742)
  |      [aopc] at org.jboss.aop.AspectManager.transform(AspectManager.java:657)
  |      [aopc] at org.jboss.aop.standalone.Compiler.compileFile(Compiler.java:266)
  |      [aopc] at org.jboss.aop.standalone.Compiler.compile(Compiler.java:199)
  |      [aopc] at org.jboss.aop.standalone.Compiler.main(Compiler.java:69)
  |      [aopc] java.lang.RuntimeException: failed to transform: com.damnhandy.binding.tutorial.Restaraunt
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.transform(Instrumentor.java:700)
  |      [aopc] at org.jboss.aop.AspectManager.translate(AspectManager.java:742)
  |      [aopc] at org.jboss.aop.AspectManager.transform(AspectManager.java:657)
  |      [aopc] at org.jboss.aop.standalone.Compiler.compileFile(Compiler.java:266)
  |      [aopc] at org.jboss.aop.standalone.Compiler.compile(Compiler.java:199)
  |      [aopc] at org.jboss.aop.standalone.Compiler.main(Compiler.java:69)
  |      [aopc] Caused by: javassist.CannotCompileException: duplicate field: _com$damnhandy$binding$aspects$ModelMixinImpl$aop$mixin
  |      [aopc] at javassist.bytecode.ClassFile.testExistingField(ClassFile.java:501)
  |      [aopc] at javassist.bytecode.ClassFile.addField(ClassFile.java:484)
  |      [aopc] at javassist.CtClassType.addField(CtClassType.java:836)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.addMixin(Instrumentor.java:240)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.instrumentIntroductions(Instrumentor.java:308)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.transform(Instrumentor.java:640)
  |      [aopc] ... 5 more
  |      [aopc] Exception in thread "main" java.lang.RuntimeException: failed to transform: com.damnhandy.binding.tutorial.Restaraunt
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.transform(Instrumentor.java:700)
  |      [aopc] at org.jboss.aop.AspectManager.translate(AspectManager.java:742)
  |      [aopc] at org.jboss.aop.AspectManager.transform(AspectManager.java:657)
  |      [aopc] at org.jboss.aop.standalone.Compiler.compileFile(Compiler.java:266)
  |      [aopc] at org.jboss.aop.standalone.Compiler.compile(Compiler.java:199)
  |      [aopc] at org.jboss.aop.standalone.Compiler.main(Compiler.java:69)
  |      [aopc] Caused by: javassist.CannotCompileException: duplicate field: _com$damnhandy$binding$aspects$ModelMixinImpl$aop$mixin
  |      [aopc] at javassist.bytecode.ClassFile.testExistingField(ClassFile.java:501)
  |      [aopc] at javassist.bytecode.ClassFile.addField(ClassFile.java:484)
  |      [aopc] at javassist.CtClassType.addField(CtClassType.java:836)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.addMixin(Instrumentor.java:240)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.instrumentIntroductions(Instrumentor.java:308)
  |      [aopc] at org.jboss.aop.instrument.Instrumentor.transform(Instrumentor.java:640)

The Restaraunt class is marked with an annotaion that pointcut picks up:

@Observable
  | public class Restaraunt {
  | 	@TableColumn(label="Title",index = 0,editable=true)
  | 	private String title;
  | 	@TableColumn(label="Category",index = 1)
  | 	private String category;
  | 	@TableColumn(label="Location",index = 2)
  | 	private String location;
  | 	private String description;
  | 	private boolean approved;
  | 	private Date created;
  | 	private int rating;
  | 	/**
  | 	 * 
  | 	 */
  | 	public Restaraunt() {
  | 		
  | 	}
  | 	/**
  | 	 * @return Returns the approved.
  | 	 */
  | 	public boolean isApproved() {
  | 		return approved;
  | 	}
  | 	/**
  | 	 * @param approved The approved to set.
  | 	 */
  | 	public void setApproved(boolean approved) {
  | 		this.approved = approved;
  | 	}
  | etc....

And finally, here is what my jboss-aop.xml looks like:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  | <aop>
  |       
  |     <bind pointcut="set(* @com.damnhandy.binding.aspects.Observable-&gt;*)">
  |         <interceptor class="com.damnhandy.binding.aspects.PropertyChangeInterceptor"/>
  |     </bind>
  |     
  |     <introduction class="@com.damnhandy.binding.aspects.Observable">
  |         <mixin>
  |             <interfaces>com.damnhandy.binding.aspects.ModelMixin</interfaces>
  |             <class>com.damnhandy.binding.aspects.ModelMixinImpl</class>
  |             <construction>new com.damnhandy.binding.aspects.ModelMixinImpl(this)</construction>
  |         </mixin>
  |         <interfaces/>
  |     </introduction>
  | </aop>

I'm using Java5 and JBoss AOP 1.3.1. I'd like to have all of this precompiled. Any pointers on how to fix the problem would be appreciated.

Ryan- 

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