rosjava_core + turtlesim = compatibility problems?

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Hi,

I just wanted to test how the rosjava_core (java master) is able to handle communication between C++ nodes. So I tried to:
-launch java implementation of master (by simple script in my: jroscore repo )
-and start two turtlesim demo nodes

If I run (in 3 terminals) these commands in sequence:

./jroscore # launches ros master implemented in rosjava_core
rosrun turtlesim turtle_teleop_key 
rosrun turtlesim turtlesim_node

The communication and everything works fine, but if I launch them in another sequence:

./jroscore # launches ros master implemented in rosjava_core
rosrun turtlesim turtlesim_node 
rosrun turtlesim turtle_teleop_key

The rosjava_core throws this exception after launching the last one:

./jroscore
jroscore: Launching master server now, uri: <a href="http://localhost:11311/">http://localhost:11311/</a>
jroscore: Server successfully launched on address: <a href="http://localhost:11311/">http://localhost:11311/</a>
Oct 02, 2013 1:12:36 PM org.apache.xmlrpc.server.XmlRpcErrorLogger log
SEVERE: Failed to invoke method registerPublisher in class org.ros.internal.node.xmlrpc.MasterXmlRpcEndpointImpl: 
org.apache.xmlrpc.common.XmlRpcInvocationException: Failed to invoke method registerPublisher in class org.ros.internal.node.xmlrpc.MasterXmlRpcEndpointImpl: 
    at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.invoke(ReflectiveXmlRpcHandler.java:129)
    at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.execute(ReflectiveXmlRpcHandler.java:106)
    at org.apache.xmlrpc.server.XmlRpcServerWorker.execute(XmlRpcServerWorker.java:46)
    at org.apache.xmlrpc.server.XmlRpcServer.execute(XmlRpcServer.java:86)
    at org.apache.xmlrpc.server.XmlRpcStreamServer.execute(XmlRpcStreamServer.java:200)
    at org.apache.xmlrpc.webserver.Connection.run(Connection.java:208)
    at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(ThreadPool.java:68)
Caused by: org.ros.exception.RemoteException: 
    at org.ros.internal.node.response.Response.fromListChecked(Response.java:115)
    at org.ros.internal.node.client.SlaveClient.publisherUpdate(SlaveClient.java:119)
    at org.ros.internal.node.server.master.MasterServer.contactSubscriberForPublisherUpdate(MasterServer.java:269)
    at org.ros.internal.node.server.master.MasterServer.publisherUpdate(MasterServer.java:251)
    at org.ros.internal.node.server.master.MasterServer.registerPublisher(MasterServer.java:225)
    at org.ros.internal.node.xmlrpc.MasterXmlRpcEndpointImpl.registerPublisher(MasterXmlRpcEndpointImpl.java:92)
    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:601)
    at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.invoke(ReflectiveXmlRpcHandler.java:115)
    ... 6 more
Caused by:
org.ros.exception.RemoteException: 
    at org.ros.internal.node.response.Response.fromListChecked(Response.java:115)
    at org.ros.internal.node.client.SlaveClient.publisherUpdate(SlaveClient.java:119)
    at org.ros.internal.node.server.master.MasterServer.contactSubscriberForPublisherUpdate(MasterServer.java:269)
    at org.ros.internal.node.server.master.MasterServer.publisherUpdate(MasterServer.java:251)
    at org.ros.internal.node.server.master.MasterServer.registerPublisher(MasterServer.java:225)
    at org.ros.internal.node.xmlrpc.MasterXmlRpcEndpointImpl.registerPublisher(MasterXmlRpcEndpointImpl.java:92)
    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:601)
    at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.invoke(ReflectiveXmlRpcHandler.java:115)
    at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.execute(ReflectiveXmlRpcHandler.java:106)
    at org.apache.xmlrpc.server ...