Start Daemons from Java

Question

Is it possible to start up a daemon from java. Specifically, I am trying to use MongoDB in java however I want my application to start up the mongod daemon if it not already running. I seem to be able to start it ok, exitcode is 0. However it always exits immediately. Is it possible to force it to stay running, then quit it with proc.destroy()?

ProcessBuilder pb = new ProcessBuilder("./bin/mongod","--dbpath data/db"); Process proc = pb.start();

If i set a breakpoint after i start the process the hasExisted boolean is always true, the exit code is 0 and I cannot connect to.

Also this is on OS X 10.5, I know ProcessBuilder is finicky across OS

./mongod --dbpath data/db doesn't start mongodb in the daemon mode. you have to use ./mongod --fork --dbpath data/db --logpath /var/log/mongodb.log --logappend for starting it as a daemon. If not started as daemon, you have to handle the stdin/stdout/stderr yourself for a process started with ProcessBuilder.start — Raihan
– Raihan, Commented Jan 27, 2012 at 2:25

Glorfindel · Accepted Answer · 2021-11-25 06:45:12Z

Your command and path are probably not handled properly. Here is what needs to be done in pseudo java (groovy) to run mongodb after a fresh install with brew

ProcessBuilder pb = new ProcessBuilder(["/usr/local/bin/mongod","run", "--config", "/usr/local/Cellar/mongodb/2.0.1-x86_64/mongod.conf"]); Process process = pb.start() InputStream is = process.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line; while ((line = br.readLine()) != null) { System.out.println(line); } int exitValue = process.waitFor() print exitValue

You can type the above directly in a groovy console.

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