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From Christian Schröder ...@deriva.de>
Subject Cross-compilation problem
Date Fri, 22 Feb 2008 14:30:18 GMT
Hi list,
I have some projects that should be compiled with javac 1.4 and some 
that should be compiled with javac 1.5. Since I do not want to change my 
environment between the projects, I have the JAVA_HOME variable set to 
the 1.5 classpath and want ant to use the external 1.4 javac when 
necessary. Unfortunately, I always get an "Error running 
/usr/java/j2sdk1.4.2/bin/javac compiler".

I have been able to create a small example build file to reproduce this 
problem:

<?xml version="1.0" encoding="UTF-8"?>
<project name="TestProject" default="default" basedir=".">
    <target name="default">
        <javac srcdir="src" destdir="classes" source="1.4" target="1.4" 
fork="yes" executable="/usr/java/j2sdk1.4.2/bin/javac"/>
    </target>
</project>

With verbose output I get the following stack trace:

/home/chschroe/deriva/projects/DerivaLibLogging/build-tmp.xml:4: Error 
running /usr/java/j2sdk1.4.2/bin/javac compiler
        at 
org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter.executeExternalCompile(DefaultCompilerAdapter.java:509)
        at 
org.apache.tools.ant.taskdefs.compilers.JavacExternal.execute(JavacExternal.java:61)
        at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:997)
        at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:820)
        at 
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at 
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:357)
        at org.apache.tools.ant.Target.performTasks(Target.java:385)
        at 
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
        at 
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
        at org.apache.tools.ant.Main.runBuild(Main.java:698)
        at org.apache.tools.ant.Main.startAnt(Main.java:199)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
Caused by: java.io.IOException: java.io.IOException: Cannot allocate memory
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
        at java.lang.ProcessImpl.start(ProcessImpl.java:65)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:451)
        at java.lang.Runtime.exec(Runtime.java:591)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at 
org.apache.tools.ant.taskdefs.Execute$Java13CommandLauncher.exec(Execute.java:828)
        at org.apache.tools.ant.taskdefs.Execute.launch(Execute.java:445)
        at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:459)
        at 
org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter.executeExternalCompile(DefaultCompilerAdapter.java:506)
        ... 20 more

The machine has several gigs of free memory and this test project is 
really small. So what's the problem?

Some information about my environment:

Apache Ant version 1.7.0 compiled on December 13 2006
javac 1.5.0_12
javac 1.4.2_15

Thanks for all help!
    Christian

-- 
Deriva GmbH                         Tel.: +49 551 489500-42
Financial IT and Consulting         Fax:  +49 551 489500-91
Hans-Böckler-Straße 2                  http://www.deriva.de
D-37079 Göttingen

Deriva CA Certificate: http://www.deriva.de/deriva-ca.cer


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