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