androidpn 服务端报SSLConfig空指针

Question

 java.lang.ExceptionInInitializerError at org.androidpn.server.xmpp.net.Connection.startTLS(Connection.java:273) at org.androidpn.server.xmpp.net.StanzaHandler.startTLS(StanzaHandler.java:297) at org.androidpn.server.xmpp.net.StanzaHandler.negotiateTLS(StanzaHandler.java:278) at org.androidpn.server.xmpp.net.StanzaHandler.process(StanzaHandler.java:118) at org.androidpn.server.xmpp.net.XmppIoHandler.messageReceived(XmppIoHandler.java:150) at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:713) at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) at org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:176) at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:375) at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:229) at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:71) at org.apache.mina.core.session.IoEvent.run(IoEvent.java:63) at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTask(OrderedThreadPoolExecutor.java:780) at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTasks(OrderedThreadPoolExecutor.java:772) at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.run(OrderedThreadPoolExecutor.java:714) at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.NullPointerException at org.androidpn.server.xmpp.ssl.SSLConfig.<clinit>(SSLConfig.java:68) ... 24 more