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From "Chris Price (JIRA)" <j...@apache.org>
Subject [jira] [Created] (EXEC-102) "Stream closed" error in Java 8 when passing input to processes that don't consume it
Date Wed, 27 Jan 2016 22:14:39 GMT
Chris Price created EXEC-102:
--------------------------------

             Summary: "Stream closed" error in Java 8 when passing input to processes that
don't consume it
                 Key: EXEC-102
                 URL: https://issues.apache.org/jira/browse/EXEC-102
             Project: Commons Exec
          Issue Type: Bug
            Reporter: Chris Price


When trying to pass an InputStream to a process (i.e. for it to be used as STDIN), I am getting
an IOException in Java 8 that I did not get in Java 7.

Here is a simple reproducer:

{code}
package foo;

import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.Executor;
import org.apache.commons.exec.PumpStreamHandler;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class CommonsExecBinTrue {
    public static void main(String[] args) throws IOException {

        Executor exec = new DefaultExecutor();

        CommandLine cl = new CommandLine("/bin/true");

        String text = "hello";
        ByteArrayInputStream input =
                new ByteArrayInputStream(text.getBytes("UTF-8"));
        ByteArrayOutputStream output = new ByteArrayOutputStream();

        exec.setStreamHandler(new PumpStreamHandler(output, null, input));
        exec.execute(cl);

        System.out.println("result: " + output.toString("UTF-8"));
    }
}
{code}

This program would work fine in Java 7, but in Java 8 it fails with this stack trace:

{code}
Exception in thread "main" java.io.IOException: Stream closed
	at java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:433)
	at java.io.OutputStream.write(OutputStream.java:116)
	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
	at java.io.FilterOutputStream.close(FilterOutputStream.java:158)
	at org.apache.commons.exec.DefaultExecutor.closeProcessStreams(DefaultExecutor.java:306)
	at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:387)
	at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
	at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:153)
	at foo.CommonsExecBinTrue.main(CommonsExecBinTrue.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
{code}



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