java.lang.ClassCastException: Cannot cast com.att.aft.dme2.internal.jersey.core.impl.provider.header.LocaleProvider to com.sun.jersey.spi.HeaderDelegateProvider at java.lang.Class.cast(Class.java:3369) at com.sun.jersey.spi.service.ServiceFinder$LazyObjectIterator.hasNext(ServiceFinder.java:833) at com.sun.jersey.core.spi.factory.AbstractRuntimeDelegate.<init>(AbstractRuntimeDelegate.java:76) at com.sun.ws.rs.ext.RuntimeDelegateImpl.<init>(RuntimeDelegateImpl.java:56) at sun.reflect.GeneratedConstructorAccessor303.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at javax.ws.rs.ext.FactoryFinder.newInstance(FactoryFinder.java:65) Caused: java.lang.ClassNotFoundException: Provider com.sun.ws.rs.ext.RuntimeDelegateImpl could not be instantiated at javax.ws.rs.ext.FactoryFinder.newInstance(FactoryFinder.java:69) at javax.ws.rs.ext.FactoryFinder.find(FactoryFinder.java:155) at javax.ws.rs.ext.RuntimeDelegate.findDelegate(RuntimeDelegate.java:105)
{code:java} java.lang.ClassCastException: Cannot cast com.att.aft.dme2.internal.jersey.core.impl.provider.header.LocaleProvider to com.sun.jersey.spi.HeaderDelegateProvider
at java.lang.Class.cast(Class.java:3369) at com.sun.jersey.spi.service.ServiceFinder$LazyObjectIterator.hasNext(ServiceFinder.java:833) at com.sun.jersey.core.spi.factory.AbstractRuntimeDelegate.<init>(AbstractRuntimeDelegate.java:76) at com.sun.ws.rs.ext.RuntimeDelegateImpl.<init>(RuntimeDelegateImpl.java:56) at sun.reflect.GeneratedConstructorAccessor303.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at javax.ws.rs.ext.FactoryFinder.newInstance(FactoryFinder.java:65) Caused: java.lang.ClassNotFoundException: Provider com.sun.ws.rs.ext.RuntimeDelegateImpl could not be instantiated at javax.ws.rs.ext.FactoryFinder.newInstance(FactoryFinder.java:69) at javax.ws.rs.ext.FactoryFinder.find(FactoryFinder.java:155)
at javax.ws.rs.ext.RuntimeDelegate.findDelegate(RuntimeDelegate.java:105){code}
The stacktrace you posted doesn't even mention the plugin, it doesn't even mention hudson/jenkins, but you can see java.lang.ClassNotFoundException. Can you add more info? Jenkins and plugin version? when are you executing getting this stracktrace?
I may be experiencing the same issue, at least the stack trace looks identical in my case. I'm getting this exact same error stack trace when clicking "Validate Settings" in Jenkins configuration page.