How to stop an OSGI Application from command line

I do have a running osgi (equinox container) application. It will been started via a bash script. See felix gogo shell

java -jar ... _osgi.jar -console 1234 &

This all works pretty well and I also can stop it via

telnet localhost 1234
<osgi>stop 0

But what I am looking for is how can I embed this into a bash script to stop the osgi application.

I already tried this

echo stop 0 | telnet localhost 1234

but this doesn't work. So if someone has idea how to put this in a bash script, please let me know.

Neil Bartlett

Telneting into the Gogo shell seems like an awfully fragile solution. Why not write your application to support standard POSIX signal handling? Then you could simply kill it with kill -s TERM <pid>.

For example the following bundle activator installs a shutdown hook that cleanly shuts down the framework, equivalently to stop 0:

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.launch.Framework;

public class ShutdownHookActivator implements BundleActivator {

    @Override
    public void start(final BundleContext context) {
        Thread hook = new Thread() {
            @Override
            public void run() {
                System.out.println("Shutdown hook invoked, stopping OSGi Framework.");
                try {
                    Framework systemBundle = context.getBundle(0).adapt(Framework.class);
                    systemBundle.stop();
                    System.out.println("Waiting up to 2s for OSGi shutdown to complete...");
                    systemBundle.waitForStop(2000);
                } catch (Exception e) {
                    System.err.println("Failed to cleanly shutdown OSGi Framework: " + e.getMessage());
                    e.printStackTrace();
                }
            }
        };
        System.out.println("Installing shutdown hook.");
        Runtime.getRuntime().addShutdownHook(hook);
    }

    @Override
    public void stop(BundleContext context) throws Exception {
    }

}

NB: if you are in control of the launcher code that starts the OSGi Framework, you should probably install the shutdown hook there rather from a separate bundle.

Update

In bash, the $! variable evaluates to the PID of the last executed background command. You can save this into your own variable for later reference, e.g.:

# Launch app:
java -jar ... &
MY_PID=$!

# Later when you want to stop your app:
kill $MY_PID

You can for instance use expect, if there is no other way than telnet to close the application.

http://www.tamas.io/automatic-scp-using-expect-and-bash/

来源：https://stackoverflow.com/questions/32211120/how-to-stop-an-osgi-application-from-command-line

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