Question

I have a Eclipse-Java-Project with an ANT-build-file. This build file exports a jar of the project without compiling it. So I only export the sources.

<target name="jar">
    <mkdir dir="/jar"/>
    <jar destfile="/jar/my_test_jarfile.jar" basedir="/src" />
</target>

I use this generated jar in another eclipse java project and set the path to the jar in the build-path-settings of the project. The problem is that eclipse says it cannot resolve the namespace of the imported classes of the jar.
If I export the jar manually by right clicking on the project and then “Export” and putting the jar to the build path of the other project, everything works fine and there are no errors. So the question is now, what am I doing wrong?

Answer 1

So here is my solution. It seems that you have to compile the source first and then pack it into a jar. I don’t give a guarantee that this jar is exactly the same like the one you get from eclipse when you do the right click thing and export etc.
But it works for me, there are no namespace errors any longer. so here is a minimum version of my ant targets:

<project default="run" basedir=".">
    <property name="src.dir" value="src" />
    <property name="classes.dir" value="bin" />
    <property name="build.dir" value="build" />

    <path id="libs">
        <fileset dir="lib">
            <include name="*.jar"/>
        </fileset>
        <pathelement path="${basedir}\${classes.dir}"/>
    </path>

    <target name="run">
        <antcall target="compile"/>
        <antcall target="jar"/>
    </target>

    <target name="compile">
        <javac debug="true" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="libs" encoding="UTF-8" />
    </target>

    <target name="jar">
        <jar destfile="${build.dir}/my_jar_file.jar" basedir="${classes.dir}"> 
    </target>
</project>