Question

I have a project set up like this;

Project
    -src
        -com
            -top
                -classes
                    Class_3.java
                    Class_4.java
                -utils
                    Class_5.java
                    Class_6.java
                Class_1.java
                Class_2.java
    -data
        various files
    -libs
        lib_1.jar
        lib_2.jar
        lib_3.jar
        lib_4.jar
    build.xml

class_1.java contains the main class, libs contains external dependencies, data contains various images, text files etc…

I have been trying to write an Ant build file to make a distributable JAR file but am having difficultied pulling in all the required libraries etc…

This is where I am up to.

<?xml version="1.0"?>
<project name="Project" default="jar">

    <property name="libsSrc" value="libs"/>
    <property name="build" value="build"/>
    <property name="classes" value="build/classes"/>
    <property name="jar" value="build/jar"/>
    <property name="libs" value="build/libs"/>

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

    <target name="clean" description="remove intermediate files">
        <delete dir="build"/>
    </target>

    <target name="compile" description="compile the Java source code to class files">
        <mkdir dir="${classes}"/>
        <javac srcdir="." destdir="${classes}" classpathref="classpath">
            <compilerarg line="-encoding utf-8"/>
        </javac>
    </target>

    <target name="jar" depends="compile" description="create a Jar file for the application">
        <mkdir dir="${jar}"/>
        <jar destfile="${jar}/App.jar">
            <fileset dir="${classes}" includes="**/*.class"/>
            <manifest>
                <attribute name="Main-Class" value="com.top.Class_1"/>
            </manifest>
        </jar>
    </target>

</project>

This doesn’t work currently.

It compiles with no errors but doesn’t include the required dependencies and the JAR cannot find the main class. How can I fix it?

Answer 1

<?xml version="1.0"?>
<project name="Rutherford" default="jar">

    <property name="libsSrc" value="libs"/>
    <property name="build" value="build"/>
    <property name="classes" value="build/classes"/>
    <property name="jar" value="build/jar"/>
    <property name="libs" value="build/libs"/>

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

    <pathconvert property="mf.classpath" pathsep=" ">
            <path refid="classpath"/>
            <mapper>
                    <chainedmapper>
                            <flattenmapper/>
                            <globmapper from="*.jar" to="lib/*.jar"/>
                    </chainedmapper>
            </mapper>
    </pathconvert>

    <target name="clean" description="remove intermediate files">
        <delete dir="build"/>
    </target>

    <target name="compile" description="compile the Java source code to class files">
        <mkdir dir="${classes}"/>
        <javac srcdir="." destdir="${classes}" classpathref="classpath">
            <compilerarg line="-encoding utf-8"/>
        </javac>
    </target>

    <target name="jar" depends="compile" description="create a Jar file for the application">
        <mkdir dir="${jar}"/>
        <jar destfile="${jar}/App.jar">
            <zipgroupfileset dir="${libsSrc}" includes="*.jar"/>
            <fileset dir="${classes}" includes="**/*.class"/>
            <manifest>
                <attribute name="Main-Class" value="com.top.Class_1"/>
                <attribute name="Class-Path" value="${mf.classpath}"/>
            </manifest>
        </jar>
    </target>

</project>

Seems to do the trick but the line;

<compilerarg line="-encoding utf-8"/>

seems to do nothing, I have a few text files containing UTF-8 encoded characters that are read into strings and displayed that are not showing properly; dσ/dΩ shows as dÃ/d©. I will ask that in another question though.