如果我从多个线程中使用JSch，应该如何使用它 [英] If I use JSch from more than one thread, how should I use it

问题描述

由于连接创建需要花费很多时间，并且我想连接到多个主机，所以我开始从多个线程使用JSch。

Since connection creation takes up quite a few times, and I'd like to connect to multiple hosts, I started to use JSch from multiple threads.

但是我收到一些令人讨厌的异常，我认为这是因为JSch不是线程安全的。我应该如何使用它，以免由于JSch的非线程安全性而引发任何异常？

However I get some nasty exceptions, which I think is because of JSch being not thread-safe. How should I use it, that it not throws any exception, which is due to the not-thread-safety of JSch?

Stacktrace：

Stacktrace:

com.jcraft.jsch.JSchException: connection is closed by foreign host
    at com.jcraft.jsch.Session.connect(Session.java:269)
    at com.jcraft.jsch.Session.connect(Session.java:183)
    at com.ericsson.eea.ark.test.common.ssh.JschSshContext.session$lzycompute(JschSshContext.scala:64)

更新

在我的测试多次连接到相同主机。这就是为什么我遇到异常。

update

In my test I connected to the same host multiple times. That's why I got the exception.

推荐答案

与其他任何非线程安全类一样。

As any other non-thread safe class.

一次只能从单个线程访问它。

Access it from a single thread at a time only.

使用 synchronized 语句：< br>
https://docs.oracle.com/ javase / tutorial / essential / concurrency / locksync.html

如果这会降低性能，则可以创建连接池。

If this downgrades performance, you can create a connection pool.

尽管我不认为此异常是由并发访问引起的。

Though I do not think this exception is caused by a concurrent access.

服务器拒绝来自同一主机的过于频繁的连接尝试（这很常见）。

It's rather that the server rejects too frequent connection attempts from the same host (what is quite common).

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