build.xml

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

<property name="src.dir" value="src/main/java/ija/projekt"/>
<property name="build.dir"   value="build"/>
<property name="doc.dir"   value="doc"/>
<property name="dest-client.dir" value="dest"/>
    <property name="res.dir" location="src/main/resources"/>

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

        <!--<path id="path.test">-->
        <!--<pathelement location="lib/junit-4.12.jar" />-->
        <!--<pathelement location="lib/hamcrest-core-1.3.jar"/>-->
        <!--<pathelement location="${build.main.dir}"/>-->
        <!--</path>-->

<path id="library.gradle:_com.google.code.gson:gson:2.8.6.classpath">
    <pathelement location="${basedir}/../../../../.gradle/caches/modules-2/files-2.1/com.google.code.gson/gson/2.8.6/9180733b7df8542621dc12e21e87557e8c99b8cb/gson-2.8.6.jar"/>
</path>

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

<dirset dir="${basedir}/src/main">
    <include name="java"/>
    <include name="resources"/>
</dirset>

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

    <path id="ija-projekt.main.module.sourcepath">
        <dirset dir="${basedir}/src/main">
            <include name="java"/>
            <include name="resources"/>
        </dirset>
    </path>

<target name="compile-classes" depends="clean">
<mkdir dir="${build.dir}"/>
    <javac destdir="${build.dir}" debug="true" includeantruntime="false">
        <src refid="ija-projekt.main.module.sourcepath"/>
        <classpath refid="classpath.test"/>
    </javac>
<copy todir="${build.dir}">
    <fileset dir="${src.dir}" includes="**/*.fxml"/>
    <fileset dir="${src.dir}" includes="**/*.css"/>
    <fileset dir="lib" includes="**/*.png"/>
</copy>
</target>

    <path id="classpath.test">
        <pathelement location="lib/gson-2.8.6.jar"/>
    </path>

<target name="compile" depends="compile-classes">
<mkdir dir="${dest-client.dir}"/>
<jar destfile="${dest-client.dir}/ija-projekt.jar" basedir="${build.dir}">
    <manifest>
        <attribute name="Main-Class" value="ija.projekt.Main"/>
    </manifest>
    <zipgroupfileset dir="${basedir}/lib" includes="**/*.jar"/>
    <fileset dir="${res.dir}"/>
</jar>
</target>

<target name="run" depends="compile">
<java jar="${dest-client.dir}/ija-projekt.jar" fork="true"/>
</target>

<target name="clean-build" depends="clean,compile"/>

<target name="main" depends="clean,run"/>

</project>