Setting the target version of Java in ant javac

Question

I need to compile a jar file using ant (1.7.0) to run under a specific version of Java (1.5). I currently have Java 1.6 on my machine. I have tried setting:

<target name="compile">   <javac compiler="javac1.5" target="1.5" srcdir=.../> </target> 

I have also removed

<property name="build.compiler" value="modern"/> 

and there is no properties file. I am running Java 1.6 on Linux/SUSE

Also is there a simple way of determining which version of Java is expected in the jar file.

Answer 1

Use "target" attribute and remove the 'compiler' attribute. See here. So it should go something like this:

<target name="compile">   <javac target="1.5" srcdir=.../> </target> 

Hope this helps

Answer 2

Both source and target should be specified. I recommend providing ant defaults, that way you do not need to specify source/target attribute for every javac task:

<property name="ant.build.javac.source" value="1.5"/> <property name="ant.build.javac.target" value="1.5"/> 

See Java cross-compiling notes for more information.