how to restart tomcat from a running webapp?

Question

I need to restart tomcat service from a webapp running on this tomcat. So I'm trying to execute script that stops tomcat service, and then starts it:

echo "before stop" >> textfile.txt
NET STOP "Tomcat7"

:loop
    timeout 3
    SC query Tomcat7 | FIND "STATE" | FIND "RUNNING" > NUL

IF ERRORLEVEL 1 (
    goto start
) ELSE (
    goto loop
)

:start
    NET START "Tomcat7"

Java code:

   String command = "C:\\Tomcat 7.0\\bin\\restart.bat";
   Process p = Runtime.getRuntime().exec(command);

Tomcat is stopped, but not started. If I run this batch from command line, it works properly.

thank you for your time

Answer 1

This worked:

        String fileName = "C:\\Tomcat 7.0\\bin\\restart.bat";
        String[] commands = {"cmd", "/c", "start", "\"DummyTitle\"",fileName};
        Runtime.getRuntime().exec(commands);

taken from http://www.rgagnon.com/javadetails/java-0014.html

Answer 2

What you are asking is not exactly safe and possible but do take a look at Tomcat manager API that allows you to programmatically manipulate Tomcat deployment and instance:

http://tomcat.apache.org/tomcat-7.0-doc/api/index.html

http://tomcat.apache.org/tomcat-7.0-doc/api/org/apache/catalina/manager/host/HostManagerServlet.html