java execute command prompt problem

Question

public class CmdExec {

     public static void main(String argv[]) {
            try {
                Runtime rt = Runtime.getRuntime();
                StreamWrapper error, output;
                String TEMP = "/output:C:\\InstallList.txt product get name,version";     
                System.out.println(TEMP);
                CmdExec rte = new CmdExec();
                Process proc = rt.exec("wmic");
                proc = rt.exec(TEMP);

                error = rte.getStreamWrapper(proc.getErrorStream(), "ERROR");
                output = rte.getStreamWrapper(proc.getInputStream(), "OUTPUT");
                int exitVal = 0;
                error.start();
                output.start();
                error.join(3000);
                output.join(3000);
                exitVal = proc.waitFor();
                System.out.println("Output: "+output.message+"\nError: "+error.message);



     } catch (IOException e) {
         e.printStackTrace();
     } catch (InterruptedException e) {
         e.printStackTrace();
        }
}
}

getting Exception :

java.io.IOException: CreateProcess: \output:C:\InstallList.txt product get name,version error=123 at java.lang.ProcessImpl.create(Native Method) at java.lang.ProcessImpl.(Unknown Source) at java.lang.ProcessImpl.start(Unknown Source) at java.lang.ProcessBuilder.start(Unknown Source) at java.lang.Runtime.exec(Unknown Source) at java.lang.Runtime.exec(Unknown Source) at java.lang.Runtime.exec(Unknown Source) at CmdExec.main(CmdExec.java:20)

For better help sooner, post an SSCCE, that will supposedly explain what a StreamWrapper is. It would also help to ask a specific question, as Jon alluded to, even if it is only "How do I solve this exception?". — Andrew Thompson
– Andrew Thompson, Commented Apr 2, 2011 at 7:24
Runtime.exec starts a new Process for every invokation. exec("wmic") will start a process without arguments and exec(TEMP) has commandline arguments without an executable. The result is nonsense and fails. — josefx
– josefx, Commented Apr 2, 2011 at 8:43

Stephen C · Accepted Answer · 2011-04-02 07:05:07Z

1

The problem is that you are trying to execute "/output:C:\\InstallList.txt product get name,version" as a command and that isn't working. (Indeed, it looks like nonsense to me.)

I expect that you should be executing the command like this:

    rt.exec("wmic /output:C:\\InstallList.txt product get name,version");

answered Apr 2, 2011 at 7:05

Stephen C

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2 Comments

Andrew Thompson Over a year ago

Why not use a String[] for the args to rt.exec()? That way such output paths as C:\\Program Files\\InstallList.txt can be handled without escapes or obtuse substitution characters.

Stephen C Over a year ago

@Andrew - in general, true. In this particular case, it makes no difference. (The "\" has to be escaped anyway ...)

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