"Exception occurred trying to invoke the getter"

I'm getting a RuntimeOperationsException when I perform a certain query on the latest Glassfish server.

The following:

conn.queryMBeans(new ObjectName("com.sun.appserv:host=*,path=/*,type=Manager"),null);

Gives me:

javax.management.RuntimeOperationsException: Exception occurred trying to invoke the getter on the MBean

at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:650)

at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)

at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.sun.enterprise.admin.util.proxy.ProxyClass.invoke(ProxyClass.java:77)

at $Proxy1.getAttribute(Unknown Source)

at com.sun.enterprise.admin.server.core.jmx.SunoneInterceptor.getAttribute(SunoneInterceptor.java:310)

at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1401)

at javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72)

at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1262)

at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1357)

at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:598)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)

at sun.rmi.transport.Transport$1.run(Transport.java:159)

at java.security.AccessController.doPrivileged(Native Method)

at sun.rmi.transport.Transport.serviceCall(Transport.java:155)

at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)

at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)

at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)

at java.lang.Thread.run(Thread.java:619)

at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)

at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)

at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)

at com.sun.jmx.remote.internal.PRef.invoke(Unknown Source)

at javax.management.remote.rmi.RMIConnectionImpl_Stub.getAttribute(Unknown Source)

at javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection.getAttribute(RMIConnector.java:863)

at com.loomissayles.jmxonitor.jmx.dao.JMXDAO.getSessionInfo(JMXDAO.java:77)

at com.loomissayles.jmxonitor.jmx.dao.JMXDAO.getSessionInfo(JMXDAO.java:65)

at com.loomissayles.jmxonitor.jmx.dao.test.JMXDAOTest.testGetSessionInfo(JMXDAOTest.java:22)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)

at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)

at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)

at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)

at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)

at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)

at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)

at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)

at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)

at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

Caused by: java.lang.IllegalArgumentException: Attribute cannot benull