How to Avoid Deadlocks When Reading JSch Command Output?

How to Continuously Read JSch Command Output

When running a command via JSch, it's essential to continuously read the output to prevent deadlocks resulting from a full output buffer. Here's how to achieve this:

<code class="java">ChannelExec channel = (ChannelExec)session.openChannel("exec");

channel.setCommand(...);

ByteArrayOutputStream outputBuffer = new ByteArrayOutputStream();
ByteArrayOutputStream errorBuffer = new ByteArrayOutputStream();

InputStream in = channel.getInputStream();
InputStream err = channel.getExtInputStream();

channel.connect();

while (!channel.isClosed()) {
    // Read stdout continuously
    while (in.available() > 0) {
        outputBuffer.write(in.read(tmp, 0, 1024));
    }

    // Read stderr continuously
    while (err.available() > 0) {
        errorBuffer.write(err.read(tmp, 0, 1024));
    }

    try {
        Thread.sleep(1000);
    } catch (Exception e) {}
}

System.out.println("output: " + outputBuffer.toString("UTF-8"));
System.out.println("error: " + errorBuffer.toString("UTF-8"));

channel.disconnect();</code>

By continuously reading the output, the command execution is not blocked and the output can be retrieved and processed as needed.

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