编译Java文件时遇到问题（与ANT和XML有关）

Question

Basically, when I execute the command ant -f mybuild.xml clean junit-TestRunner , I get lots of errors in my java file, it's giving errors on junit imports like:

    java:6: error: package org.junit does not exist

Here's a section of my xml file where it gives me errors on test-compile:

<path id="test.classpath">
   <pathelement location="${build.test.dir}"/>
</path>

<target name="test-compile" depends="test-init">
      <javac srcdir="test" 
      destdir="build\test"
      includeAntRuntime="No"/>
</target>

<target name="junit-TestRunner" depends="test-compile">
  <java classname="org.junit.runner.JUnitCore" 
        classpathref="C:\junit-4.10">
    <arg value="org.example.antbook.junit.SimpleTest"/>
  </java>

  <java classname="org.junit.runner.JUnitCore" 
        classpathref="test.classpath">
    <arg value="org.eclipseguide.persistence.FilePersistenceServicesTest"/>
  </java>
</target>

I assume it cannot find the the directory where my junit-4.10.jar file is located. I've changed that in the 'classpathref', but still give me same errors.

Any suggestions?

Answer 1

Don't put junit.jar into your $ANT_HOME . If you do that, you will cause problems when you install a new version of Ant, or if someone else checks out the file. Here's your problem:

<target name="junit-TestRunner" depends="test-compile">
   <java classname="org.junit.runner.JUnitCore" 
       classpathref="C:\junit-4.10">
       <arg value="org.example.antbook.junit.SimpleTest"/>
   </java>

A classpathref is a reference to a classpath. It is defined separately, and it is not a jar or directory.

For example, before I call my <java> task, I first define my classpath reference:

<classpath id="test.classpath">
    <pathelement path="C:/junit-4.10"/>
</classpath>

This defines a reference to this classpath called test.classpath . You can now use it in your <java> task:

<target name="junit-TestRunner" depends="test-compile">
    <classpath id="test.classpath">
        <pathelement path="C:/junit-4.10"/>
    </classpath>

   <java classname="org.junit.runner.JUnitCore" 
       classpathref="test.classpath">
       <arg value="org.example.antbook.junit.SimpleTest"/>
   </java>

Another thing you could do is simply include the classpath , so you don't have to define a reference to it in the first place:

<target name="junit-TestRunner" depends="test-compile">
   <java classname="org.junit.runner.JUnitCore">
       <arg value="org.example.antbook.junit.SimpleTest"/>
       <classpath>
           <pathelement path="C:/junit-4.10"/>
       </classpath>
   </java>

By the way, avoid the backslash. It can cause problems because it can sometimes be used as a quoting character . Instead, use a forward slash like I did in the above.

Answer 2

I suspect this:

classpathref="C:\junit-4.10"

should point to a jar file or a classes subdir under the above.

Answer 3

Have you checked the second "note" on this page ? I think the easiest way is #1, to put those JARs in ${ANT_HOME}/lib folder. That way you don't have to specify any classpaths.

Answer 4

Add the following target to your build.

<target name="bootstrap" description="Install build dependencies">
    <mkdir dir="${user.home}/.ant/lib"/>
    <get dest="${user.home}/.ant/lib/junit.jar" src="http://search.maven.org/remotecontent?filepath=junit/junit/4.11/junit-4.11.jar"/>
</target>

This will install the junit jar into one of ANT standard locations for 3rd party dependencies.