CODEWITHSUNDEEP
javaantconfigurationcompilation
Marius Kurgonas
Marius Kurgonas

Reputation: 83

java ant run command - can not find lib jars

My ant build file looks like this:

<project name="Algorithm" basedir="." default="main">

<property name="src.dir"     value="src"/>

<property name="build.dir"   value="build"/>
<property name="classes.dir" value="${build.dir}/classes"/>

<property name="main-class"  value="ye.tian.Main"/>

<property name="jar.dir"     value="${build.dir}/jar"/>

<property name="lib.dir"     value="lib"/>

<path id="myclasspath">
    <fileset dir="${lib.dir}" includes="*.jar"/>
</path>

<target name="jar" depends="compile">
    <mkdir dir="${jar.dir}"/>
    <jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
        <manifest>
            <attribute name="Main-Class" value="${main-class}"/>
        </manifest>
    </jar>
</target>

<target name="clean">
    <delete dir="${build.dir}"/>
</target>

<target name="compile">
    <mkdir dir="${classes.dir}"/>
    <javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="myclasspath"/>
</target>

<target name="run" depends="jar">
    <java jar="${jar.dir}/${ant.project.name}.jar" classpathref="myclasspath" fork="true"/>
</target>

My project structure is: root folder with two folders inside named src and lib. Lib contains all the jar libraries and src - packages with java files.

Running the ant run gives an error:

run:
 [java] Exception in thread "main" java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/type/TypeReference

My libs folder looks like this:

Which i understand can not find library jars named Jackson which are under lib folder... My linking must be wrong. Any advice?

Thank!

UPDATE: Updated build.xml file with the suggestion from @AR.3 still the same issue

Upvotes: 0

Views: 2473

Answers (1)

trainmaster
trainmaster

Reputation: 145

Make all the paths in all the properties absolute (by prefixing src.dir, build.dir and lib.dir with ${basedir}/). Thus you don't have to rely on working directory. <java> task you run in run target might use ${jar.dir} as a working directory and your classpath (which is resolved as a relative path) would point to non-existing build/jar/lib/*.jar.

<property name="src.dir"     value="${basedir}/src"/>
<property name="build.dir"   value="${basedir}/build"/>
<property name="lib.dir"     value="${basedir}/lib"/>

<property name="classes.dir" value="${build.dir}/classes"/>
<property name="main-class"  value="ye.tian.Main"/>
<property name="jar.dir"     value="${build.dir}/jar"/>

Upvotes: 0

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