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java.lang.NullPointerException at org.xbib.elasticsearch.action.knapsack.state.TransportKnapsackStateAction.doExecute(TransportKnapsackStateAction.java:53) at org.xbib.elasticsearch.action.knapsack.state.TransportKnapsackStateAction.doExecute(TransportKnapsackStateAction.java:32) at org.elasticsearch.action.support.TransportAction.doExecute(TransportAction.java:149) at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:137) at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:85) at org.elasticsearch.client.node.NodeClient.doExecute(NodeClient.java:58) at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:359) at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:86) at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:56) at org.xbib.elasticsearch.plugin.knapsack.tar.KnapsackTarTests.testTarXz(KnapsackTarTests.java:146)