The class org.camunda.bpm.engine.rest.dto.task.GroupInfoDto requires a zero argument constructor or a specified factory method.

[2013-10-22T15:33:42.948+0200] [glassfish 4.0] [SEVERE] [] [org.glassfish.jersey.server.ServerRuntime$Responder] [tid: _ThreadID=46 _ThreadName=http-listener-2(4)] [timeMillis: 1382448822948] [levelValue: 1000] [[
  Error occurred when processing a response created from an already mapped exception.]]

[2013-10-22T15:33:42.950+0200] [glassfish 4.0] [WARNING] [] [javax.enterprise.web] [tid: _ThreadID=46 _ThreadName=http-listener-2(4)] [timeMillis: 1382448822950] [levelValue: 900] [[
  StandardWrapperValve[Engine Api]: Servlet.service() for servlet Engine Api threw exception
java.lang.RuntimeException: javax.servlet.ServletException: javax.ws.rs.WebApplicationException: HTTP 500 Internal Server Error
        at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:61)
        at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:56)
        at org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:38)
        at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:56)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
        at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:160)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
        at org.apache.catalina.core.StandardHostValve.__invoke(StandardHostValve.java:174)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
        at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
        at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
        at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
        at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
        at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
        at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
        at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
        at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
        at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
        at java.lang.Thread.run(Thread.java:724)
Caused by: javax.servlet.ServletException: javax.ws.rs.WebApplicationException: HTTP 500 Internal Server Error
        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:333)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:335)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:218)
        at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:47)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:67)
        at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:51)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:59)
        ... 33 more
Caused by: javax.ws.rs.WebApplicationException: HTTP 500 Internal Server Error
        at org.eclipse.persistence.jaxb.rs.MOXyJsonProvider.writeTo(MOXyJsonProvider.java:810)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:194)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:139)
        at org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:103)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:139)
        at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:88)
        at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:139)
        at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1005)
        at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:471)
        at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:333)
        at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:347)
        at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:230)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:198)
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:946)
        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:323)
        ... 47 more
Caused by: javax.xml.bind.JAXBException: 
Exception Description: The class org.camunda.bpm.engine.rest.dto.task.GroupInfoDto requires a zero argument constructor or a specified factory method.  Note that non-static inner classes do not have zero argument constructors and are not supported.
 - with linked exception:
[Exception [EclipseLink-50001] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.JAXBException
Exception Description: The class org.camunda.bpm.engine.rest.dto.task.GroupInfoDto requires a zero argument constructor or a specified factory method.  Note that non-static inner classes do not have zero argument constructors and are not supported.]
        at org.eclipse.persistence.jaxb.JAXBContext$TypeMappingInfoInput.createContextState(JAXBContext.java:1021)
        at org.eclipse.persistence.jaxb.JAXBContext.<init>(JAXBContext.java:174)
        at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:165)
        at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:152)
        at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:112)
        at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:102)
        at org.eclipse.persistence.jaxb.rs.MOXyJsonProvider.getJAXBContext(MOXyJsonProvider.java:302)
        at org.eclipse.persistence.jaxb.rs.MOXyJsonProvider.writeTo(MOXyJsonProvider.java:787)
        ... 67 more
Caused by: Exception [EclipseLink-50001] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.JAXBException
Exception Description: The class org.camunda.bpm.engine.rest.dto.task.GroupInfoDto requires a zero argument constructor or a specified factory method.  Note that non-static inner classes do not have zero argument constructors and are not supported.
        at org.eclipse.persistence.exceptions.JAXBException.factoryMethodOrConstructorRequired(JAXBException.java:144)
        at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.finalizeProperties(AnnotationsProcessor.java:896)
        at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processClassesAndProperties(AnnotationsProcessor.java:282)
        at org.eclipse.persistence.jaxb.compiler.Generator.<init>(Generator.java:150)
        at org.eclipse.persistence.jaxb.JAXBContext$TypeMappingInfoInput.createContextState(JAXBContext.java:1017)
        ... 74 more