How to run script on Tomcat startup?

Question

I would like to know how to run a shell script on Tomcat startup, that is when catalina.log prints \"INFO: Server startup in xxx ms\"

Thanks in advance, bye

Answer 1

At Tomcat 7, you can accomplish that through a custom listener in the server.xml file at tomcat's configuration:

CustomEventHootListener.java:

package your.domain;

import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleEvent;
import org.apache.catalina.LifecycleListener;

public class CustomEventHookListener implements LifecycleListener {
  @Override
  public void lifecycleEvent(LifecycleEvent arg0) {
    Lifecycle lifecycle = arg0.getLifecycle();
    if (lifecycle == null) {
      return;
    }
    String type = arg0.getType();
    if (type == null) {
      return;
    }
    String stateName = lifecycle.getStateName();
    if (stateName == null) {
      return;
    }
    if (type.equals("after_start") && stateName.equals("STARTED")) {
      startPostInitScript();
    }
  }

  private void startPostInitScript() {
    // Non-blocking please.
    Thread t = new Thread() {
      @Override
      public void run() {
        try {
          super.run();
          String script = "/path/to/your-script.sh";
          // inheritIO to output things to JVM.
          new ProcessBuilder().command(script).inheritIO().start().waitFor();
        } catch (Throwable e) {
          e.printStackTrace();
        }
      }
    };
    t.setDaemon(true);
    t.start();
  }
}

You can see a functional example at https://github.com/Valemobi/tomcat-events-hook