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[jetty-users] Exception initiating WebSocketClient

Hi community!

I am trying to load an example where I change messages between Ros and Java. I have add all the libraries that I have found, but I always get the following exception:

Exception in thread "main" java.lang.NullPointerException
    at org.eclipse.jetty.websocket.common.extensions.AbstractExtension.getName(AbstractExtension.java:90)
    at org.eclipse.jetty.websocket.api.extensions.ExtensionFactory.<init>(ExtensionFactory.java:37)
    at org.eclipse.jetty.websocket.common.extensions.WebSocketExtensionFactory.<init>(WebSocketExtensionFactory.java:40)
    at org.eclipse.jetty.websocket.client.WebSocketClient.<init>(WebSocketClient.java:85)
    at org.eclipse.jetty.websocket.client.WebSocketClient.<init>(WebSocketClient.java:78)
    at ros.RosBridge.connect(RosBridge.java:113)
    at tests.RosTest.main(RosTest.java:27)


These are the libraries:

com.fasterxml.jackson.core.jar
jetty-websocket-8.0.0.v20110901.jar
com.fasterxml.jackson.databind.jar
websocket-api-9.0.0.rc0.jar
websocket-client-9.0.3.v20130506.jar
websocket-client-9.0.3.v20130506-hybrid.jar
websocket-client-9.0.2.v20130417.jar
websocket-client-9.0.2.v20130417-hybrid.jar
websocket-client-9.1.0.m0-hybrid.jar
jetty-util-9.0.0.rc0.jar
jetty-io-9.0.0.m1.jar
websocket-common-9.0.0.rc1.jar
java_rosbridge.jar
java_rosbridge_all.jar
jetty-all.jar
jetty-all-9.2.6.v20141205.jar

--
Cheers!
Elías.

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