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Posted to user@ant.apache.org by Juha Laiho <Ju...@iki.fi> on 2009/12/21 19:26:06 UTC
Re: Java in JDK but ANT can't find it!
I came across this oldish thread while trying to resolve the same
problem:
David Nemer wrote:
> I am running ANT programmatically in JAVA. So, my task is to build the
> BUILD.XML.
> I'm able to do so, but it throws an exception saying:
>
> /scratch2/nemer/test/xfire/build.xml:5: The following error occurred
while
> executing this line:
> /scratch2/nemer/test/xfire/build-common.xml:81: Unable to find a javac
> compiler;
> com.sun.tools.javac.Main is not on the classpath.
> Perhaps JAVA_HOME does not point to the JDK.
> It is currently set to "/opt/jdk1.6.0_06/jre"
I think I have found an explanation on what is going on, at least
for cases where ant is run using a shell script on the command line.
Environment:
Linux (Slackware)
Java is Sun JDK 1.6.0_17-b04, from Slackware packages
build.xml for the test:
<project>
<echo message="JAVA_HOME: ${java.home}"/>
</project>
Environment variables, executable locations:
bash-3.1$ echo $JAVA_HOME
/usr/lib64/java
bash-3.1$ echo $PATH
/usr/lib64/java/bin:/usr/bin:/bin:/home/jlaiho/aa/apache-ant-1.7.1/bin
bash-3.1$ type -a ant
ant is /home/jlaiho/aa/apache-ant-1.7.1/bin/ant
bash-3.1$ type -a java
java is /usr/lib64/java/bin/java
The installation pointed to by JAVA_HOME is a JDK installation
(tools.jar does exist in $JAVA_HOME/lib). A JRE installation
also exists, at $JAVA_HOME/jre .
bash-3.1$ ls -l /usr/lib64/java/lib/tools.jar
-rw-r--r-- 1 root root 12590684 2009-11-05 23:08
/usr/lib64/java/lib/tools.jar
Running the test:
bash-3.1$ ant
Buildfile: build.xml
[echo] JAVA_HOME: /usr/lib64/java/jre
BUILD SUCCESSFUL
Total time: 0 seconds
What happened? Explanation can be found in the ant shell script,
starting at line 125 (at which point there hasn't been anything
that would set JAVACMD):
if [ -z "$JAVACMD" ] ; then
if [ -n "$JAVA_HOME" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
JAVACMD="$JAVA_HOME/jre/sh/java"
elif [ -x "$JAVA_HOME/jre/bin/java" ] ; then
JAVACMD="$JAVA_HOME/jre/bin/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
else
JAVACMD=`which java 2> /dev/null `
if [ -z "$JAVACMD" ] ; then
JAVACMD=java
fi
fi
fi
... so, as JAVACMD was empty, and JAVA_HOME was set, AND
$JAVA_HOME/jre/bin/java did exist, then the JAVA_HOME was
forcible overridden with the JRE home directory. I don't
understand why, but that is what happens.
Is this a bug - perhaps? At least it's not what I would
expect.
--
..Juha
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Re: Java in JDK but ANT can't find it!
Posted by Antoine Levy Lambert <an...@gmx.de>.
Hello Juha,
I do not understand what is causing the described problem to happen. The
ant script never sets JAVA_HOME. At least not directly.
Can you check whether the rpm_mode is activated on your computer ?
I think you can run ant like that " ant --noconfig " to desactivate the
rpm_mode.
Regards,
Antoine
Can you run the ant script like that : sh -x
/home/jlaiho/aa/apache-ant-1.7.1/bin/ant
to better find out what is happening >
Regards,
Antoine
Juha Laiho wrote:
> I came across this oldish thread while trying to resolve the same
> problem:
>
> David Nemer wrote:
> > I am running ANT programmatically in JAVA. So, my task is to build the
> > BUILD.XML.
> > I'm able to do so, but it throws an exception saying:
> >
> > /scratch2/nemer/test/xfire/build.xml:5: The following error occurred
> while
> > executing this line:
> > /scratch2/nemer/test/xfire/build-common.xml:81: Unable to find a javac
> > compiler;
> > com.sun.tools.javac.Main is not on the classpath.
> > Perhaps JAVA_HOME does not point to the JDK.
> > It is currently set to "/opt/jdk1.6.0_06/jre"
>
>
> I think I have found an explanation on what is going on, at least
> for cases where ant is run using a shell script on the command line.
>
>
> Environment:
> Linux (Slackware)
> Java is Sun JDK 1.6.0_17-b04, from Slackware packages
>
> build.xml for the test:
> <project>
> <echo message="JAVA_HOME: ${java.home}"/>
> </project>
>
> Environment variables, executable locations:
> bash-3.1$ echo $JAVA_HOME
> /usr/lib64/java
> bash-3.1$ echo $PATH
> /usr/lib64/java/bin:/usr/bin:/bin:/home/jlaiho/aa/apache-ant-1.7.1/bin
> bash-3.1$ type -a ant
> ant is /home/jlaiho/aa/apache-ant-1.7.1/bin/ant
> bash-3.1$ type -a java
> java is /usr/lib64/java/bin/java
>
> The installation pointed to by JAVA_HOME is a JDK installation
> (tools.jar does exist in $JAVA_HOME/lib). A JRE installation
> also exists, at $JAVA_HOME/jre .
>
> bash-3.1$ ls -l /usr/lib64/java/lib/tools.jar
> -rw-r--r-- 1 root root 12590684 2009-11-05 23:08
> /usr/lib64/java/lib/tools.jar
>
> Running the test:
> bash-3.1$ ant
> Buildfile: build.xml
> [echo] JAVA_HOME: /usr/lib64/java/jre
>
> BUILD SUCCESSFUL
> Total time: 0 seconds
>
> What happened? Explanation can be found in the ant shell script,
> starting at line 125 (at which point there hasn't been anything
> that would set JAVACMD):
>
> if [ -z "$JAVACMD" ] ; then
> if [ -n "$JAVA_HOME" ] ; then
> # IBM's JDK on AIX uses strange locations for the executables
> if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
> JAVACMD="$JAVA_HOME/jre/sh/java"
> elif [ -x "$JAVA_HOME/jre/bin/java" ] ; then
> JAVACMD="$JAVA_HOME/jre/bin/java"
> else
> JAVACMD="$JAVA_HOME/bin/java"
> fi
> else
> JAVACMD=`which java 2> /dev/null `
> if [ -z "$JAVACMD" ] ; then
> JAVACMD=java
> fi
> fi
> fi
>
> ... so, as JAVACMD was empty, and JAVA_HOME was set, AND
> $JAVA_HOME/jre/bin/java did exist, then the JAVA_HOME was
> forcible overridden with the JRE home directory. I don't
> understand why, but that is what happens.
>
> Is this a bug - perhaps? At least it's not what I would
> expect.
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