Ant Javac and Commandline Javac give different results

小能豆

Ant Javac and Commandline Javac give different results

javascript

I have a class that imports some servlet libraries. When I compile it from command-line it is fine.

When I use the ant compile task to compile it, it gives the errors that it can’t find the servlet libraries in its path.

Is that a known/common occurrence?

Here is my Ant target:

<target name="compile" depends="prepare" description="compile the source" >
    <echo>=== COMPILE === SRCDIR: ${src}/com/udfr/src/java </echo> <!-- Compile the java code from ${src} into ${build} -->
    <javac srcdir="${src}/com/udfr/src/java" destdir="${dist}/WEB-INF/classes"/>
</target>

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2023-11-21

共1个答案

小能豆

Yes, this issue is quite common when using Ant to compile Java projects that depend on external libraries, such as servlet libraries. When you compile from the command line, the classpath is often set correctly, but when using Ant, you need to ensure that the classpath is properly configured.

In your Ant target, you should include the necessary servlet libraries in the classpath. Assuming you have the servlet JAR files in a lib directory, you can modify your javac task like this:

<target name="compile" depends="prepare" description="compile the source">
    <echo>=== COMPILE === SRCDIR: ${src}/com/udfr/src/java </echo>
    <!-- Compile the java code from ${src} into ${build} -->
    <javac srcdir="${src}/com/udfr/src/java" destdir="${dist}/WEB-INF/classes">
        <classpath>
            <fileset dir="${lib}" includes="*.jar" />
        </classpath>
    </javac>
</target>

In this example, ${lib} is assumed to be the directory containing your servlet libraries. Adjust the path accordingly based on your project structure.

Make sure that the servlet JAR files are present in the specified directory, and this should resolve the compilation issues related to missing servlet libraries when using Ant.

2023-11-21