Hi Friends,<div><br></div><div>I am seeing following exception </div><div><br></div><div><div>21-Jun-2011 18:29:01 org.apache.xmlrpc.server.XmlRpcErrorLogger log</div><div>SEVERE: Failed to invoke method registerSubscriber in class org.ros.internal.node.xmlrpc.MasterImpl: null</div>

<div>org.apache.xmlrpc.common.XmlRpcInvocationException: Failed to invoke method registerSubscriber in class org.ros.internal.node.xmlrpc.MasterImpl: null</div><div><span class="Apple-tab-span" style="white-space:pre">  </span>at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.invoke(ReflectiveXmlRpcHandler.java:129)</div>

<div><span class="Apple-tab-span" style="white-space:pre">      </span>at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.execute(ReflectiveXmlRpcHandler.java:106)</div><div><span class="Apple-tab-span" style="white-space:pre">        </span>at org.apache.xmlrpc.server.XmlRpcServerWorker.execute(XmlRpcServerWorker.java:46)</div>

<div><span class="Apple-tab-span" style="white-space:pre">      </span>at org.apache.xmlrpc.server.XmlRpcServer.execute(XmlRpcServer.java:86)</div><div><span class="Apple-tab-span" style="white-space:pre">       </span>at org.apache.xmlrpc.server.XmlRpcStreamServer.execute(XmlRpcStreamServer.java:200)</div>

<div><span class="Apple-tab-span" style="white-space:pre">      </span>at org.apache.xmlrpc.webserver.Connection.run(Connection.java:208)</div><div><span class="Apple-tab-span" style="white-space:pre">   </span>at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(ThreadPool.java:68)</div>

<div>Caused by: java.lang.IllegalStateException</div><div><span class="Apple-tab-span" style="white-space:pre">     </span>at com.google.common.base.Preconditions.checkState(Preconditions.java:129)</div><div><span class="Apple-tab-span" style="white-space:pre">   </span>at org.ros.internal.node.server.MasterServer.addSlave(MasterServer.java:80)</div>

<div><span class="Apple-tab-span" style="white-space:pre">      </span>at org.ros.internal.node.server.MasterServer.registerSubscriber(MasterServer.java:110)</div><div><span class="Apple-tab-span" style="white-space:pre">       </span>at org.ros.internal.node.xmlrpc.MasterImpl.registerSubscriber(MasterImpl.java:123)</div>

<div><span class="Apple-tab-span" style="white-space:pre">      </span>at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)</div><div><span class="Apple-tab-span" style="white-space:pre">       </span>at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)</div>

<div><span class="Apple-tab-span" style="white-space:pre">      </span>at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)</div><div><span class="Apple-tab-span" style="white-space:pre">     </span>at java.lang.reflect.Method.invoke(Method.java:597)</div>

<div><span class="Apple-tab-span" style="white-space:pre">      </span>at org.apache.xmlrpc.server.ReflectiveXmlRpcHandler.invoke(ReflectiveXmlRpcHandler.java:115)</div></div><div><br></div><div><br></div><div>My code is </div>

<div><br></div><div>//Publisher</div><div><div>node = new Node(<font class="Apple-style-span" color="#3366ff">"Camera1"</font>, configuration);</div><div><span class="Apple-tab-span" style="white-space:pre">                       </span>publisher = node.createPublisher("Camera1",</div>

<div><span class="Apple-tab-span" style="white-space:pre">                                      </span>org.ros.message.sensor_msgs.Image.class);</div></div><div>....................</div><div><br></div><div>//Subscriber </div><div><div> node = new Node(<font class="Apple-style-span" color="#3366ff">"Camera1</font>", configuration);</div>

<div>      System.out.println("ScreenView.main() Starting");</div><div>//      final Log log = node.getLog();</div><div>      node.createSubscriber("Camera1", new MessageListener<org.ros.message.sensor_msgs.Image>() {</div>

<div>        public void onNewMessage(org.ros.message.sensor_msgs.Image message) {</div><div>          System.out</div><div><span class="Apple-tab-span" style="white-space:pre">                               </span>.println("Subscriber \"" + message + "\"");</div>

<div>        }</div><div>      }, org.ros.message.sensor_msgs.Image.class);</div></div><div><br></div><div><br></div><div>Reason behind this exception is Nodes with same name.</div><div>If I change this name and create different nodes in publisher and subscribers code then its fine.</div>

<div><br></div><div>Anyone has any idea why is that or we are not supposed to create node with same name?</div><div><br clear="all">Thanks and Regards<br>Abhishek Verma<br>
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