I'm having problems getting my Java program to run (it uses some third party JARs). I can compile it fine but when I call my run target in ant it says it can't find the class that I told it run in the classpath. Here's what my build.xml looks like: ``` ``` Does anyone know what I might be doing wrong? Here's my stack trace from ant: ``` ant run Buildfile: build.xml run: [java] Could not find GuiStarter. Make sure you have it in your classpath [java] at org.apache.tools.ant.ta…

Problems with setting the classpath in ant

ant, classpath, java

Solution

I think the problem is with your `classpath` path declaration. The `build` directory should be a `<pathelement>`

<path id="classpath">
    <fileset dir="${lib}">
        <include name="**/*.jar" />
    </fileset>
    <pathelement location="${build}" />
</path>

Also, I would only include 3-rd party jars in your `classpath` refid. So the whole block looks like.

<path id="3rd-party-classpath">
    <fileset dir="${lib}">
        <include name="**/*.jar" />
    </fileset>
</path>

<target name="build">
    <javac srcdir="${src}" destdir="${build}">
        <classpath refid="3rd-party-classpath" />
    </javac>
</target>

<target name="run">
    <java classname="FirstClass">
      <classpath>
        <pathelement location="${build}" />
        <path refid="3rd-party-classpath" />
      </classpath>
    </java>
</target>

Also, as DroidIn.net has pointed out, you should create a package for you program.

Problem

I'm having problems getting my Java program to run (it uses some third party JARs). I can compile it fine but when I call my run target in ant it says it can't find the class that I told it run in the classpath. Here's what my build.xml looks like: ``` <project basedir="." default="build"> <property name="build" value="build" /> <property name="src" value="." /> <property name="lib" value="lib" /> <path id="classpath"> <fileset dir="${lib}"> <include name="**/*.jar" /> </fileset> <fileset dir="${build}"> <include name="*.class" /> </fileset> </path> <target name="build"> <javac srcdir="${src}" destdir="${build}"> <classpath refid="classpath" /> </javac> </target> <target name="run"> <java classname="FirstClass"> <classpath refid="classpath" /> </java> </target> ``` Does anyone know what I might be doing wrong? Here's my stack trace from ant: ``` ant run Buildfile: build.xml run: [java] Could not find GuiStarter. Make sure you have it in your classpath [java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:138) [java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:764) [java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:218) [java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:132) [java] at org.apache.tools.ant.taskdefs.Java.execute(Java.java:105) [java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) [java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [java] at java.lang.reflect.Method.invoke(Method.java:616) [java] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) [java] at org.apache.tools.ant.Task.perform(Task.java:348) [java] at org.apache.tools.ant.Target.execute(Target.java:357) [java] at org.apache.tools.ant.Target.performTasks(Target.java:385) [java] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) [java] at org.apache.tools.ant.Project.executeTarget(Project.java:1306) [java] at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) [java] at org.apache.tools.ant.Project.executeTargets(Project.java:1189) [java] at org.apache.tools.ant.Main.runBuild(Main.java:758) [java] at org.apache.tools.ant.Main.startAnt(Main.java:217) [java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257) [java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104) [java] Java Result: -1 BUILD SUCCESSFUL Total time: 1 second ```

Original source