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Close process streams after exit to work around JDK-4311711 hang #412

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Close process streams after exit to work around JDK-4311711 hang #412

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42 changes: 21 additions & 21 deletions src/main/java/org/apache/maven/shared/utils/cli/CommandLineUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
*/
package org.apache.maven.shared.utils.cli;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
Expand Down Expand Up @@ -274,27 +275,26 @@ public Integer call() throws CommandLineException {

int returnValue = p.waitFor();

// TODO Find out if waitUntilDone needs to be called using a try-finally construct. The method may
// throw an
// InterruptedException so that calls to waitUntilDone may be skipped.
// try
// {
// if ( inputFeeder != null )
// {
// inputFeeder.waitUntilDone();
// }
// }
// finally
// {
// try
// {
// outputPumper.waitUntilDone();
// }
// finally
// {
// errorPumper.waitUntilDone();
// }
// }
// Close the process streams to work around JDK-4311711:
// Process.getInputStream().read() can hang indefinitely
// even after the process has terminated. Closing the
// streams causes the pumpers' readLine() calls to return.
try {
p.getOutputStream().close();
} catch (IOException e) {
// ignore
}
try {
p.getInputStream().close();
} catch (IOException e) {
// ignore
}
try {
p.getErrorStream().close();
} catch (IOException e) {
// ignore
}

if (inputFeeder != null) {
inputFeeder.waitUntilDone();
}
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