Question

When I try to execute an external program from java I use this code below :

Process p;
rn = Runtime.getRuntime();

String[] unzip = new String[2];

unzip[0]="unzip";

unzip[1]=archive ;

public void dezip() throws IOException{

    p = rn.exec(unzip);
    int ret = p.exitValue();

System.out.println("End of unzip method");

But my last System.out is never executed, as if we exit from unzip method.
The unzip() call does only the half of the work, only a part of my archive is unzipped.
When I use ps -x or htop from command line I see that unzip process is still here.

Help please.

Answer 1

You probably need to read the InputStream from the process. See the javadoc of Process

Which states:

Because some native platforms only provide limited buffer size for
standard input and output streams, failure to promptly write the input
stream or read the output stream of the subprocess may cause the
subprocess to block, and even deadlock.