build.xml

<project name="AgentBridge" basedir="." default="main"> 
  <property name="src.dir"     value="src"/> 
 
  <property name="build.dir"   value="build"/> 
  <property name="classes.dir" value="${build.dir}/classes"/> 
  <property name="jar.dir"     value="${build.dir}/jar"/> 
 
  <property name="main-class"  value="com.fluentstream.agentbridge.Main"/> 
 
  <property name="lib.dir"     value="lib"/> 
 
  <path id="classpath"> 
    <fileset dir="${lib.dir}" includes="**/*.jar"/> 
  </path> 
 
  <target name="clean"> 
    <delete dir="${build.dir}"/> 
  </target> 
 
  <target name="compile"> 
    <mkdir dir="${classes.dir}"/> 
    <javac includeantruntime="false" srcdir="${src.dir}" destdir="${classes.dir}"
           classpathref="classpath"/> 
  </target> 
 
  <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="run" depends="jar"> 
    <java fork="true" classname="${main-class}"> 
      <classpath> 
        <path refid="classpath"/> 
        <path id="application" location="${jar.dir}/${ant.project.name}.jar"/> 
      </classpath> 
    </java> 
  </target> 
 
  <target name="junit" depends="jar"> 
    <junit printsummary="yes"> 
      <classpath> 
        <path refid="classpath"/> 
        <path refid="application"/> 
      </classpath> 
 
      <batchtest fork="yes"> 
        <fileset dir="${src.dir}" includes="*Test.java"/> 
      </batchtest> 
    </junit> 
  </target> 
 
  <target name="clean-build" depends="clean,jar"/> 
 
  <target name="main" depends="clean,run"/> 
 
</project>

result.txt

blt@doritos:~/projects/agentbridge
$ ant compile
Buildfile: /home/blt/projects/agentbridge/build.xml

compile:
    [mkdir] Created dir: /home/blt/projects/agentbridge/build/classes
    [javac] Compiling 2 source files to /home/blt/projects/agentbridge/build/classes
a
BUILD SUCCESSFUL
Total time: 0 seconds

blt@doritos:~/projects/agentbridge
$ ant jar
Buildfile: /home/blt/projects/agentbridge/build.xml

compile:

jar:
    [mkdir] Created dir: /home/blt/projects/agentbridge/build/jar
      [jar] Building jar: /home/blt/projects/agentbridge/build/jar/AgentBridge.jar

BUILD SUCCESSFUL
Total time: 0 seconds

blt@doritos:~/projects/agentbridge
$ ant junit
Buildfile: /home/blt/projects/agentbridge/build.xml

compile:

jar:

junit:

BUILD FAILED
/home/blt/projects/agentbridge/build.xml:45: Reference application not found.

Total time: 0 seconds

tree.txt

blt@doritos:~/projects/agentbridge
$ tree
.
├── agentbridge.proto
├── build
│   ├── classes
│   │   ├── com
│   │   │   └── fluentstream
│   │   │       └── agentbridge
│   │   │           └── Main.class
│   │   └── MainTest.class
│   └── jar
│       └── AgentBridge.jar
├── build.xml
├── client.cpp
├── lib
│   ├── ant-junit.jar
│   ├── junit.jar
│   └── log4j-1.2.16.jar
├── Makefile
├── README
├── server.cpp
└── src
    ├── com
    │   └── fluentstream
    │       └── agentbridge
    │           └── Main.java
    └── MainTest.java

This looks like an error I noticed when I tried the ANT hello world tutorial. See my fork for a possible fix. I've just started learning ANT, but I guess reference lookup is scoped, so you have to refer to XML elements on the same or higher levels, not some nested within other elements.

Thanks for the comment. I wrote and fixed and finished this code so long ago that I don't hardly even remember what all the fuss was about.

Ah, I half suspected that might be the case.