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POFailure to start program from java (using ProcessBuilder)
 

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    <p>I am trying to call cleartool from an java application, but cleartool hangs even for a simple "-version" argument. Running cleardiff instead of cleartool works fine, so apparently there is something specific with the cleartool program (which I assume is related to its interactive capabilities).</p> <p>The following program</p> <pre><code>import java.io.*; import java.util.*; public class ExecTesting extends Thread { private List&lt;String&gt; command = new ArrayList&lt;String&gt;(); public ExecTesting (List&lt;String&gt; command) { super(); this.command = command; } private void print(String s) { System.out.println(s); } @Override public void run() { Process process; OutputStream stdin; InputStream stdout; InputStream stderr; String line; try { String commandString = joinList(command, " "); print("Executing: " + commandString); // runtime.exec has several issues (http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=1) // better to use ProcessBuilder (http://java.sun.com/developer/JDCTechTips/2005/tt0727.html#2) //process = Runtime.getRuntime().exec(commandString); process = new ProcessBuilder(command).start(); // it fails in both cases though stdin = process.getOutputStream(); stdout = process.getInputStream(); stderr = process.getErrorStream(); BufferedReader bufferedStderr = new BufferedReader(new InputStreamReader(stderr)); while ((line = bufferedStderr.readLine()) != null) { print("stderr: " + line); } bufferedStderr.close(); BufferedReader bufferedStdout = new BufferedReader(new InputStreamReader(stdout)); while ((line = bufferedStdout.readLine()) != null) { print("stdout: " + line); } bufferedStdout.close(); stdin.close(); stdout.close(); stderr.close(); process.waitFor(); print("Execution finished, exit code " + process.exitValue()); process.destroy(); } catch (IOException e) { print("IOException: " +e.getStackTrace()); } catch (InterruptedException e) { print("InterruptedException: " + e.getStackTrace()); } } /* assumes a list with at least one element */ private static String joinList(List&lt;String&gt; list, String glue) { Iterator&lt;String&gt; i = list.iterator(); String ret = i.next(); while (i.hasNext()) { ret += glue + i.next(); } return ret; } public static void main(String[] args) { ArrayList&lt;String&gt; cmd1 = new ArrayList&lt;String&gt;(); cmd1.add("c:\\Program Files\\Rational\\ClearCase\\bin\\cleardiff.exe"); cmd1.add("-version"); ExecTesting et1 = new ExecTesting(cmd1); et1.start(); ArrayList&lt;String&gt; cmd2 = new ArrayList&lt;String&gt;(); //cmd2.add("c:\\Program Files\\Rational\\ClearCase\\bin\\cleardiff.exe"); cmd2.add("c:\\Program Files\\Rational\\ClearCase\\bin\\cleartool.exe"); cmd2.add("-version"); ExecTesting et2 = new ExecTesting(cmd2); et2.start(); et1 = new ExecTesting(cmd1); et1.start(); } } </code></pre> <p>gives the following output</p> <pre><code>Executing: [c:\Program Files\Rational\ClearCase\bin\cleardiff.exe, -version] Executing: [c:\Program Files\Rational\ClearCase\bin\cleartool.exe, -version] Executing: [c:\Program Files\Rational\ClearCase\bin\cleardiff.exe, -version] stdout: cleardiff 2003.06.10+ (Tue Jul 13 14:02:05 2004) Execution finished, exit code 0 </code></pre> <p>hanging on the execution of the cleartool command. If instead cmd2 is changed to cleardiff the output is as expected</p> <pre><code>Executing: [c:\Program Files\Rational\ClearCase\bin\cleardiff.exe, -version] Executing: [c:\Program Files\Rational\ClearCase\bin\cleardiff.exe, -version] Executing: [c:\Program Files\Rational\ClearCase\bin\cleardiff.exe, -version] stdout: cleardiff 2003.06.10+ (Tue Jul 13 14:02:05 2004) Execution finished, exit code 0 stdout: cleardiff 2003.06.10+ (Tue Jul 13 14:02:05 2004) Execution finished, exit code 0 stdout: cleardiff 2003.06.10+ (Tue Jul 13 14:02:05 2004) Execution finished, exit code 0 </code></pre> <p>Question: Does anyone know why cleartool is hanging and how to fix?</p>
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