[jboss-user] [JBoss Seam] - JavaAssist fails to create proxy
My component:
| package org.blog.weblayer.session;
|
| import org.jboss.seam.ScopeType;
| import org.jboss.seam.annotations.Scope;
| import org.jboss.seam.annotations.AutoCreate;
| import org.jboss.seam.annotations.Name;
|
| @Name("Sessiontag_st") @AutoCreate @Scope(ScopeType.SESSION) public class
Var0 implements java.io.Serializable,
weblayer.SessionVar<org.blog.domainmodel.Tag>
| {
| org.blog.domainmodel.Tag var = new org.blog.domainmodel.Tag();
|
| public void setVar(org.blog.domainmodel.Tag var)
| {
| this.var = var;
| }
|
| public org.blog.domainmodel.Tag getVar()
| {
| return var;
| }
| }
|
The interface:
| package weblayer;
|
| public interface SessionVar<T> {
|
| public T getVar();
|
| public void setVar(T t);
|
| }
|
The lookup in another component:
| ((weblayer.SessionVar)Component.getInstance("Sessiontag_st")).setVar(t);
|
this line fails with:
| org.jboss.seam.InstantiationException
| <snip>
| Caused by: java.lang.RuntimeException: duplicate method: getVar
| [java] at
javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:173)
| [java] at org.jboss.seam.Component.createProxyFactory(Component.java:1979)
| [java] at org.jboss.seam.Component.getProxyFactory(Component.java:1154)
| [java] at org.jboss.seam.Component.wrap(Component.java:1145)
| [java] at org.jboss.seam.Component.instantiateJavaBean(Component.java:1134)
| [java] at org.jboss.seam.Component.instantiate(Component.java:1088)
| [java] at org.jboss.seam.Component.newInstance(Component.java:1736)
| [java] ... 76 more
| [java] Caused by: javassist.CannotCompileException: duplicate method: getVar
| [java] at
javassist.bytecode.ClassFile.testExistingMethod(ClassFile.java:544)
| [java] at javassist.bytecode.ClassFile.addMethod(ClassFile.java:528)
| [java] at javassist.util.proxy.ProxyFactory.override(ProxyFactory.java:373)
| [java] at
javassist.util.proxy.ProxyFactory.overrideMethods(ProxyFactory.java:349)
| [java] at javassist.util.proxy.ProxyFactory.make(ProxyFactory.java:277)
| [java] at
javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:164)
| [java] ... 82 more
|
If I get rid of the interface on the session scoped component and cast to Var0 directly,
everything works dandy... So, why can't my Seam component implement an interface?
(offtopic: originally I wanted to make Var0 parameterized, i.e. Var, assigning it
different roles for each session var so that I do not need to write a specialization for
each type I have, implementing a common generic interface. However, I really need the
instantiation of the member field, which cannot be done by virtue of Java's type
erasure scheme for generics)
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