Java – ant buildfile setting javac location

antbuildjavaxml

I'm editing the buildfile of an old project. When I add some jar files to the project that use Java 1.6, it won't build. It says

[javac] javac: invalid target release: 1.6

So clearly I need to tell the ant buildfile to use javac 1.6.

How do I do this? I have JDK1.6 installed on my system, but the default javac is 1.5. I don't want to change the default javac… I just want to set the javac location in this one proejct to JDK1.6/bin/javac. How do I do this in the XML of an ant buildfile?

Thanks,
ktm

Best Answer

This was pulled from the javac task documentation

<javac srcdir="" 
         destdir=""
         executable="path-to-java16-home/bin/javac" 
         fork="true"
         taskname="javac1.6" />

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Java – Ant is using wrong java version

Just had this issue, it happened because I'd first added the build file to the ant-view when the default JRE was 1.6.

There was no project-specific JRE and I changed the default to 1.5, even eclipse was running in 1.5, and JAVA_HOME was 1.5 too. Running the ant target from the command line used JRE 1.5, but within eclipse it still used 1.6.

I had to right-click the ant target, select Run As... and change the JRE under the JRE tab. This setting is remembered for subsequent runs.

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The m2eclipse plugin doesn't use Eclipse defaults, the m2eclipse plugin derives the settings from the POM. So if you want a Maven project to be configured to use Java 1.6 settings when imported under Eclipse, configure the maven-compiler-plugin appropriately, as I already suggested:

<plugin>
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  <artifactId>maven-compiler-plugin</artifactId>
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Best Answer

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