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Posted to dev@ant.apache.org by bu...@apache.org on 2005/10/04 05:49:08 UTC
DO NOT REPLY [Bug 36903] New: -
ANT Java Task hangs or causes other processes to hang
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http://issues.apache.org/bugzilla/show_bug.cgi?id=36903
Summary: ANT Java Task hangs or causes other processes to hang
Product: Ant
Version: 1.6.5
Platform: PC
OS/Version: Windows 2000
Status: NEW
Severity: blocker
Priority: P2
Component: Core tasks
AssignedTo: dev@ant.apache.org
ReportedBy: nomorogbe@idiominc.com
CC: nomorogbe@idiominc.com
BugsThisDependsOn: 24918
In attempting to upgrade our build process to ANT 1.6.5 from ANT 1.6.2, we have
encountered various hangs in java or other forked processes during our build
process.
It appears to be a serious regression in the ANT Java Task.
We observed this behavior with ANT 1.6.{3,4,5} -- this bug is present in all
three latest versions.
Everything worked perfectly with ANT 1.6.2.
Seems Bug fix 24918 has caused this regression.
Compared the sources of ANT 1.6.2 and 1.6.5 for Java Task;
the only notable change was this fix for 24918.
By just commenting these lines out and recompiling this 1 file, the hanging
problems go away, and everything works on ANT 1.6.5.
apache-ant-1.6.5\src\main\org\apache\tools\ant\taskdefs\Java.java
/**
* Set up properties on the redirector that we needed to store locally.
*/
protected void setupRedirector() {
redirector.setInput(input);
redirector.setInputString(inputString);
redirector.setOutput(output);
redirector.setError(error);
if (redirectorElement != null) {
redirectorElement.configure(redirector);
}
// if (!spawn && input == null && inputString == null) {
// #24918: send standard input to the process by default.
// redirector.setInputStream(new KeepAliveInputStream(getProject
().getDefaultInputStream()));
// }
}
We need this fix before we can upgrade our ANT version to the latest release :-(
We observed that sometimes adding fork="yes" to Java Task works around the
problem, but at other points removing fork="yes" works around the problem, so
have not been able to establish a consistent pattern for how to work around
this.
We also observed that having fork="yes" option when running a java task, can
sometimes cause other unrelated processes later on to hang, even though the
java process itself successfully terminates (or so it seemed).
We have fairly complicated build scripts that invoke numerous java and non-java
processes;
I have not yet been able to isolate a simple reproducible case.
We also do our builds using Cruise Control
(http://cruisecontrol.sourceforge.net) and first observed it there.
Though, it has nothing to do with Cruise Control, as I can reproduce the
problems easily by invoking the same ANT targets directly from bash command
line.
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