If you are hosting more then one tomcats on a physical box in production then lot of times you might want to see the process id of running instance. We dump jstacks/top command output in a folder every 5 minutes and this helps in correlating it. Here is a sample code to dump tomcat pid.
public String getJvmProcessid() throws IOException {
String pid = null;
File pidFile = new File(System.getenv("CATALINA_PID"));
if(pidFile.exists()) {
FileInputStream fin = new FileInputStream(pidFile);
List lines = IOUtils.readLines(fin);
fin.close();
pid = StringUtils.join(lines.toArray());
}
return pid;
}
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