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POAnt optional classpath element
 

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    <p>I have some modules and a main runnable project. I have common build file, and </p> <p>build.common.xml</p> <pre><code>&lt;target name="build" &gt; &lt;path id="libraries.classpath"&gt; &lt;fileset dir="${lib.dir}" includes="*.jar" /&gt; &lt;/path&gt; &lt;javac srcdir="${src.dir}" destdir="${build.dir}" includeantruntime="false" source="1.6"&gt; &lt;classpath refid="libraries.classpath" /&gt; &lt;classpath refid="modules.classpath" /&gt; &lt;/javac&gt; &lt;/target&gt; </code></pre> <p>..and every module declares its own dependencies in their build.xml:</p> <pre><code>&lt;path id="modules.classpath"&gt; &lt;pathelement path="../ModuleA/${build.dir}" /&gt; ... &lt;/path&gt; </code></pre> <p>The problem is if there is no internal dependency I get the following exception: "Reference modules.classpath not found."</p> <p>What is the solution for that? <strong>How could I declare an optional classpath element?</strong></p> <p><strong>Note:</strong> <em>If anybody want to suggest to create jars out of my modules, please justify this. I'm going to have 5-10 rapidly changing modules, and I don't want to do unnecesary steps in the build process.</em></p> <p><strong>Update:</strong> I extracted the build into two different targets and created a condition for them, but did not help (it echoes the 'false' and builds with module-dependencies):</p> <pre><code>&lt;target name="build"&gt; &lt;condition property="modules.classpath.set" else="false"&gt; &lt;isset property="modules.classpath"/&gt; &lt;/condition&gt; &lt;echo message="modules.classpath is set: ${modules.classpath.set} " /&gt; &lt;antcall target="build-with-modules" /&gt; &lt;antcall target="build-without-modules" /&gt; &lt;/target&gt; &lt;target name="build-with-modules" if="modules.classpath.set"&gt; &lt;echo message="Building with module-dependencies" /&gt; &lt;javac srcdir="${src.dir}" destdir="${build.dir}" includeantruntime="false" source="1.6"&gt; &lt;classpath refid="libraries.classpath" /&gt; &lt;classpath refid="modules.classpath" /&gt; &lt;/javac&gt; &lt;/target&gt; &lt;target name="build-without-modules" unless="modules.classpath.set"&gt; &lt;echo message="Building with no dependent modules" /&gt; &lt;javac srcdir="${src.dir}" destdir="${build.dir}" includeantruntime="false" source="1.6"&gt; &lt;classpath refid="libraries.classpath" /&gt; &lt;/javac&gt; &lt;/target&gt; </code></pre>
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    1. COOk, I think I know the problem: `<path id="modules.classpath">` is not a property, so the `<isset property="modules.classpath"/>` always became false. But I don't know the solution...
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    2. COI've tried `<available classpathref="modules.classpath" property="modules.classpath.set" />` , but it does not work neither...
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