Execute shell commands from Java

I am trying to execute shell commands from Java applications on GNU / Linux platform The problem is that the script that calls another Java application never ends, even though it runs successfully from bash I tried to debug it:

(gdb) bt
#0  0xb773d422 in __kernel_vsyscall ()
#1  0xb7709b5d in pthread_join (threadid=3063909232,thread_return=0xbf9cb678) at pthread_join.c:89
#2  0x0804dd78 in ContinueInNewThread ()
#3  0x080497f6 in main ()

I tried: processbuilder(); And runtime getRuntime(). exec(cmd);

It looks like it's waiting to finish something Any ideas?

Thank you, Lauren ţ iu

Solution

Are you working with standard input and standard output? From JavaDocs:

Process cmdProc = Runtime.getRuntime().exec(command);


BufferedReader stdoutReader = new BufferedReader(
         new InputStreamReader(cmdProc.getInputStream()));
String line;
while ((line = stdoutReader.readLine()) != null) {
   // process procs standard output here
}

BufferedReader stderrReader = new BufferedReader(
         new InputStreamReader(cmdProc.getErrorStream()));
while ((line = stderrReader.readLine()) != null) {
   // process procs standard error here
}

int retValue = cmdProc.exitValue();