Question

我对SSHJ和多线程有疑问。我有一个使用SSHJ在远程服务器上使用SSHJ SSHExec类执行命令的类，它是Threads的扩展。我这样做是因为某些远程命令可能需要一段时间才能运行，我想并行运行它们，因为它们不会相互影响。

所以我的设置中有class_A，可以启动class_B的多个版本，这是执行SSH命令的程序。当我将class_A配置为仅启动class_B的一个实例时，一切正常。但是，当我将class_A配置为启动多个class_B的一个实例时，它会因以下错误而失败。

Aug 2, 2012 12:08:44 PM backup.SSHExec run
SEVERE: null
net.schmizz.sshj.transport.TransportException: Unexpected: SSH_MSG_UNIMPLEMENTED
    at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:33)
    at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:27)
    at net.schmizz.concurrent.Promise.deliverError(Promise.java:95)
    at net.schmizz.concurrent.Event.deliverError(Event.java:72)
    at net.schmizz.concurrent.ErrorDeliveryUtil.alertEvents(ErrorDeliveryUtil.java:34)
    at net.schmizz.sshj.transport.TransportImpl.die(TransportImpl.java:576)
    at net.schmizz.sshj.transport.Reader.run(Reader.java:79)
Caused by: net.schmizz.sshj.common.SSHException: [PROTOCOL_ERROR] Unexpected: SSH_MSG_UNIMPLEMENTED
    at net.schmizz.sshj.AbstractService.notifyUnimplemented(AbstractService.java:66)
    at net.schmizz.sshj.transport.TransportImpl.gotUnimplemented(TransportImpl.java:555)
    at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:490)
    at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:127)
    at net.schmizz.sshj.transport.Decoder.received(Decoder.java:195)
    at net.schmizz.sshj.transport.Reader.run(Reader.java:72)
Exception in thread "Thread-18" java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:61)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:55)
    at backup.StreamReader.run(StreamReader.java:86)
Exception in thread "Thread-17" java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:61)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:55)
    at backup.StreamReader.run(StreamReader.java:86)
Aug 2, 2012 12:08:44 PM backup.SSHExec run
SEVERE: null
net.schmizz.sshj.transport.TransportException: socket closed
    at net.schmizz.sshj.transport.TransportImpl.init(TransportImpl.java:164)
    at net.schmizz.sshj.SSHClient.onConnect(SSHClient.java:671)
    at net.schmizz.sshj.SocketClient.connect(SocketClient.java:71)
    at net.schmizz.sshj.SocketClient.connect(SocketClient.java:77)
    at net.schmizz.sshj.SocketClient.connect(SocketClient.java:103)
    at backup.SSHExec.run(SSHExec.java:73)
    at backup.SSHExec.exec(SSHExec.java:42)
    at backup.BackupExec2.copyPrevBackup(BackupExec2.java:335)
    at backup.BackupExec2.run(BackupExec2.java:164)
Caused by: java.net.SocketException: socket closed
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:129)
    at java.net.SocketInputStream.read(SocketInputStream.java:182)
    at net.schmizz.sshj.transport.TransportImpl.init(TransportImpl.java:158)
    ... 8 more
Exception in thread "Thread-23" java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:61)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:55)
    at backup.StreamReader.run(StreamReader.java:86)
Exception in thread "Thread-24" java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:61)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:55)
    at backup.StreamReader.run(StreamReader.java:86)

在线程中启动多个SSHExec会话是否有问题？如果不是我可能做错了什么？

SSHJ和多个线程

0 个答案: