Apache Mina SSHD服務器：無會話可用

Question

我正在使用Apache Mina SSHD編寫SSH服務器。服務器啓動正常，但是當我嘗試連接到服務器時，出現「無會話可用」異常。這裏是服務器的代碼：

SshServer sshd = SshServer.setUpDefaultServer(); 
sshd.setPort(port); 

PasswordAuthenticator auth = new PasswordAuthenticator() { 
    public boolean authenticate(String string, String string1, ServerSession ss) { 
     return true; 
    } 
}; 
sshd.setPasswordAuthenticator(auth); 
sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider("hostkey.ser")); 
sshd.start(); 

這裏是我所得到的，當我嘗試連接到服務器：

134 [com.ssh.Startup.main()] INFO org.apache.sshd.common.util.SecurityUtils - Trying to register BouncyCastle as a JCE provider 
454 [com.ssh.Startup.main()] INFO org.apache.sshd.common.util.SecurityUtils - Registration succeeded 
3845 [NioProcessor-2] INFO org.apache.sshd.server.session.ServerSession - Session created from /127.0.0.1:50426 
3879 [NioProcessor-2] WARN org.apache.mina.core.filterchain.DefaultIoFilterChain - Unexpected exception from exceptionCaught handler. 
java.lang.IllegalStateException: No session available 
    at org.apache.sshd.common.AbstractSessionIoHandler.exceptionCaught(AbstractSessionIoHandler.java:52) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.exceptionCaught(DefaultIoFilterChain.java:697) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextExceptionCaught(DefaultIoFilterChain.java:483) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1100(DefaultIoFilterChain.java:46) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.exceptionCaught(DefaultIoFilterChain.java:791) 
    at org.apache.mina.core.filterchain.IoFilterAdapter.exceptionCaught(IoFilterAdapter.java:111) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextExceptionCaught(DefaultIoFilterChain.java:483) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireExceptionCaught(DefaultIoFilterChain.java:471) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextSessionCreated(DefaultIoFilterChain.java:359) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$700(DefaultIoFilterChain.java:46) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.sessionCreated(DefaultIoFilterChain.java:771) 
    at org.apache.mina.core.filterchain.IoFilterAdapter.sessionCreated(IoFilterAdapter.java:79) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextSessionCreated(DefaultIoFilterChain.java:357) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireSessionCreated(DefaultIoFilterChain.java:350) 
    at org.apache.mina.core.service.IoServiceListenerSupport.fireSessionCreated(IoServiceListenerSupport.java:211) 
    at org.apache.mina.core.polling.AbstractPollingIoProcessor.addNow(AbstractPollingIoProcessor.java:521) 
    at org.apache.mina.core.polling.AbstractPollingIoProcessor.handleNewSessions(AbstractPollingIoProcessor.java:488) 
    at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:67) 
    at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1103) 
    at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    at java.lang.Thread.run(Thread.java:662) 
Caused by: java.lang.NoSuchMethodError: org.slf4j.Logger.isTraceEnabled()Z 
    at org.apache.sshd.common.session.AbstractSession.encode(AbstractSession.java:436) 
    at org.apache.sshd.common.session.AbstractSession.writePacket(AbstractSession.java:349) 
    at org.apache.sshd.common.session.AbstractSession.sendKexInit(AbstractSession.java:693) 
    at org.apache.sshd.server.session.ServerSession.sendKexInit(ServerSession.java:336) 
    at org.apache.sshd.server.session.ServerSession.<init>(ServerSession.java:92) 
    at org.apache.sshd.server.session.SessionFactory.doCreateSession(SessionFactory.java:43) 
    at org.apache.sshd.common.session.AbstractSessionFactory.createSession(AbstractSessionFactory.java:38) 
    at org.apache.sshd.common.AbstractSessionIoHandler.sessionCreated(AbstractSessionIoHandler.java:37) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.sessionCreated(DefaultIoFilterChain.java:643) 
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextSessionCreated(DefaultIoFilterChain.java:357) 
    ... 14 more 

任何想法可能是錯誤的服務器？所有幫助表示讚賞！

Answer 1

它看起來就像你在你的classpath有SLF4J不兼容的版本：

Caused by: java.lang.NoSuchMethodError: org.slf4j.Logger.isTraceEnabled()Z