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This exception has no message.
java.lang.NullPointerException: 	at undefined.LookupMfgService.getPreferredMfgNames(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at ch.ethz.iks.r_osgi.impl.ChannelEndpointImpl.handleMessage(	at ch.ethz.iks.r_osgi.impl.ChannelEndpointImpl$	at ch.ethz.iks.r_osgi.impl.ChannelEndpointImpl$