How to specify jdk version in build.xml

[Shariq Roomi]

I have hdk 1.4 as well as jdk 1.5 in my machine.

JAVA_HOME points to jdk 1.5

I need to compile my java code using jdk 1.4.

How could I specify in build.xml to use jdk1.4 for compiling my code?

Thanks

[Purushoth Thambu]

Option 1 : change the JAVA_HOME
If Ant has been compiled against 1.5 then you can modify the build task to

<javac source="1.4" target="1.4" ...>
...
</javac>
[ April 23, 2007: Message edited by: Purushothaman Thambu ]

[Paul Sturrock]

Also, Ant has handy properties ant.build.javac.target and ant.build.javac.source which you can use instead of setting these attributes explicitly.

[Tim Holloway]

Use JAVA_HOME to specify which Java JDK you want to compile with.

Setting the "source" attribute merely tells the compiler what source restrictions apply. For example, setting 'source="1.3"' when using JDK 1.5's compiler should allow code with variables named "enum" to compile (enum is a reserved word in Java 1.5).

The "target" attribute likewise indicates what java level, the generated class files should be built for. One reason you'd set this is if you're building classes that will be serialized, since serialization isn't guaranteed across multiple runtime JVM versions. A major pain if you're doing RPC-style stuff.

[Sirish Kumar Gongal Reddy]

Hello,

Write the follwing javac target inside your "compile" target,

runtime-libs:: It will point your project lib directory. declared in properties.

<javac
bootclasspath="${runtime-libs}/rt.jar"
target="1.3"
source="1.3"
includeJavaRuntime="false"
includeAntRuntime="false"
debug="yes"
destdir="${build-dir}">
<classpath refid="project.class.path"/>
<src path="${code}"/>
</javac>

Thanks/Sirish