I'm using jaxb inside a jboss 5.0.1GA container, and seeing a strange exception at startup. It appears once only.
From the stacktrace you can see that it is during the class initialisation of FrameworkUtil class.
FrameworkUtil line 119 looks like this:
JAXBContext j = JAXBContext.newInstance(Validate.class, Response.class ....<more classes>);
Validate.java has this in it:
@XmlRootElement(name="validate")
public class Validate {
List<String> userGroups;
@XmlElementWrapper(name="userGroups")
@XmlElement(name="item")
public String[] getUserGroups() {
if (userGroups != null) {
return userGroups.toArray(new String[userGroups.size()]);
}
else return null;
}
public void setUserGroups(String[] userGrps) {
userGroups = new ArrayList<String>();
if (userGrps != null) {
for (String userGrp : userGrps) {
userGroups.add(new String(userGrp));
}
}
}
}
In the stack trace is a reference to Validate. But sometimes the stacktrace is different, and refers to the same field (userGroups) in Response.class instead.
Here's the stack trace:
Mar 19, 2015 11:20:50 AM com.sun.xml.bind.v2.runtime.reflect.opt.Injector inject
WARNING: duplicate class definition bug occured? Please report this : com/mycompany/ecommerce/message/beans/Validate$JaxbAccessorM_getUserGroups_setUserGroups_[Ljava_lang_String;
java.lang.ClassFormatError: Illegal class name "com/mycompany/ecommerce/message/beans/Validate$JaxbAccessorM_getUserGroups_setUserGroups_[Ljava_lang_String;" in class file com/mycompany/ecommerce/messa
ge/beans/Validate$JaxbAccessorM_getUserGroups_setUserGroups_[Ljava_lang_String;
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
at sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.xml.bind.v2.runtime.reflect.opt.Injector.inject(Injector.java:205)
at com.sun.xml.bind.v2.runtime.reflect.opt.Injector.inject(Injector.java:85)
at com.sun.xml.bind.v2.runtime.reflect.opt.AccessorInjector.prepare(AccessorInjector.java:89)
at com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(OptimizedAccessorFactory.java:114)
at com.sun.xml.bind.v2.runtime.reflect.Accessor$GetterSetterReflection.optimize(Accessor.java:369)
at com.sun.xml.bind.v2.runtime.property.ArrayProperty.<init>(ArrayProperty.java:65)
at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.<init>(ArrayERProperty.java:84)
at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.<init>(ArrayElementProperty.java:96)
at com.sun.xml.bind.v2.runtime.property.ArrayElementLeafProperty.<init>(ArrayElementLeafProperty.java:66)
at sun.reflect.GeneratedConstructorAccessor172.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.sun.xml.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:124)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:179)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:515)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:330)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1140)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:154)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:248)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:235)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:432)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:637)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:584)
at com.mycompany.global.er.util.FrameworkUtil.<clinit>(FrameworkUtil.java:119)