试图运行 JXSE 2.7 的示例文件 // Connecting with OSGI, Edge_Dimitri Sending messages etc, 我得到这个错误
PSE Membmership Service started.
Oct 23, 2012 8:20:13 AM net.jxta.impl.peergroup.StdPeerGroup initFirst
SEVERE: Failed to make PSE membership credential 'ready for join'
Oct 23, 2012 8:20:13 AM net.jxta.peergroup.WorldPeerGroupFactory newWorldPeerGroup
SEVERE: World Peer Group could not be instantiated.
net.jxta.exception.PeerGroupException: Failed to login to this group: null. Error=0
at net.jxta.impl.peergroup.StdPeerGroup.initFirst(StdPeerGroup.java:704)
at net.jxta.impl.peergroup.Platform.initFirst(Platform.java:214)
at net.jxta.impl.peergroup.GenericPeerGroup.init(GenericPeerGroup.java:907)
at net.jxta.peergroup.WorldPeerGroupFactory.newWorldPeerGroup(WorldPeerGroupFactory.java:312)
at net.jxta.peergroup.WorldPeerGroupFactory.<init>(WorldPeerGroupFactory.java:182)
at net.jxta.peergroup.NetPeerGroupFactory.<init>(NetPeerGroupFactory.java:203)
at net.jxta.platform.NetworkManager.startNetwork(NetworkManager.java:408)
at Examples.A_JXTA_Connection_And_Local_Configuration._160_Connecting_With_OSGi.main(_160_Connecting_With_OSGi.java:66)
这是我的 Java 构建路径（使用 eclipse）
任何帮助将不胜感激。谢谢