Ant + JUnit problems

[Greg Wilson <gv...@cs.toronto.edu>]

Hi everyone.  I can now make Ant + JUnit work on my machine, but only by
adding files to the Ant installation.  I do *not* want to tell my students
they have to do this --- my experience is that mucking with third-party
installs leads almost instantly to maintenance migraines.  So, here's what
I've got; if anyone can propose a cleaner solution than copying junit.jar
into $ANT_HOME/lib, I'd like to hear it.

- Project layout is pretty standard:

  ./
    build.xml
    src/
      User.java
    tst/
      TestUser.java
    class/
      ...User.class and TestUser.class put here...
    lib/
      ...the usual suspects --- more detail below...

I've installed JUnit in C:/junit3.8.1 (JUNIT_HOME), and Ant is in
C:/apache-ant-1.6.2 (ANT_HOME).

- Relevant parts of my build.xml are:

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

  and

    <target name="test">
        <junit fork="yes" printsummary="on">
            <classpath refid="cpath.run" />
            <formatter type="plain" usefile="false" />
            <test name="TestUser" todir="${report}" />
        </junit>
    </target>

- My CLASSPATH is set to 'C:/junit3.8.1/junit.jar;.', but Ant doesn't pay
  attention to that---it only cares about the classpath set in
  'build.xml'.  So, copy 'junit.jar' to my project's 'lib' directory: that
  makes everything compile, but when I try to run, I get:

  "Ant could not find the task or a class this task relies upon."

  followed by another screenful of messages.

- The documentation says, "You must have junit.jar and the class files for
  the <junit> task in the same classpath."  'cpath.run' includes both
  'junit.jar' and my generated class files, but not ant-junit.jar.  So,
  re-set CLASSPATH to
  'C:/junit3.8.1/junit.jar;C:/apache-ant-1.6.2/lib/ant-junit.jar;.'.
  Doesn't make a difference.

- Try copying ant-junit.jar to my 'lib' folder, so that it will be
  included in my 'cpath.run'.  No good; remove it.

- As I said above, I do *not* want to recommend to students that they
  start moving files around in third-party installations, since it
  quickly leads to maintenance nightmares.  However, let's see if copying
  'junit.jar' into '$ANT_HOME/lib' makes a difference: yup, that makes my
  tests run.  Delete it again and keep going.

- What about removing 'ant-junit.jar' from '$ANT_HOME/lib' as the FAQ
  entry at:

  http://ant.apache.org/faq.html#delegating-classloader

  seems to suggest?  (Right at the bottom, under the heading "Using The
  Second Option with Ant 1.6 and later").  This leaves me with 'junit.jar'
  and 'ant-junit.jar' in my 'lib' directory, and neither in '$ANT_HOME/lib'.
  Nope, doesn't work.

As I said in the intro, my goal isn't just to get this to work, but to get
it to work in a way I feel comfortable showing to undergraduate students.
Advice would be welcome.

Thanks,
Greg

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Re: Ant + JUnit problems

[Ivan Ivanov <ra...@yahoo.com>]

Hi Greg,
to be honest, I hardly see any reason of *not* placing
junit.jar in $ANT_HOME/lib as it saves a lot of fuss.
Anyway, here are some more ways, that prevents from
moving files in and out distribution:

1) You can place junit.jar (and all third party jars
required by ant optional task) in user's home
directory and Ant will pick them correctly. No need to
move anything in $ANT_HOME/lib.
2) You can place junit.jar in any directory, say
C:/thirdpartyJars and then pass that directory as a
parameter of -lib option to ant starting script:

ant -lib C:/thirdpartyJars test

Again no need to move anything in $ANT_HOME/lib.

3) (Requires moving a file out of ant distribution) 
> - The documentation says, "You must have junit.jar
> and the class files for
>   the <junit> task in the same classpath." 

IMHO "in the same classpath" means "loaded by same
classloader". So you can do this: place junit.jar in
any directory say C:\thirdpartyJars and then move
ant-junit jar from $ANT_HOME/lib to C:\thirdpartyJars
and then redefine junit task in this way:
<path id="junit.cp">
   <fileset dir="C:\thirdpartyJars">
      <include name="junit.jar"/>
      <include name="ant-junit.jar"/>			
   </fileset>
</path>
<taskdef name="junit" 	
classname="org.apache.tools.ant.taskdefs.optional.junit.JUnitTask"
classpathref="junit.cp"/>

Here the jars are loaded by one and the same
classloader and so it works. but in most cases <junit>
is used with <junitreport> task that is defined in
ant-junit.jar, so I should taskdef it too and I am too
lazy to do it. Anyway, it is a good exercise in
classpaths and classloading; you can even ask your
students to extend the corresponding entry in Ant's
FAQ and explain it thoroughly :)).

HTH Ivan

P.S. I started my career as a teaching assistant in
Computer Science courses, and I have also wonder a lot
how to explain and resolve classpath issues in my
lessons, so I wish you great luck with your
activities.

> 'cpath.run' includes both
>   'junit.jar' and my generated class files, but not
> ant-junit.jar.  So,
>   re-set CLASSPATH to
>  
>
'C:/junit3.8.1/junit.jar;C:/apache-ant-1.6.2/lib/ant-junit.jar;.'.
>   Doesn't make a difference.
> 
> - Try copying ant-junit.jar to my 'lib' folder, so
> that it will be
>   included in my 'cpath.run'.  No good; remove it.
> 
> - As I said above, I do *not* want to recommend to
> students that they
>   start moving files around in third-party
> installations, since it
>   quickly leads to maintenance nightmares.  However,
> let's see if copying
>   'junit.jar' into '$ANT_HOME/lib' makes a
> difference: yup, that makes my
>   tests run.  Delete it again and keep going.
> 
> - What about removing 'ant-junit.jar' from
> '$ANT_HOME/lib' as the FAQ
>   entry at:
> 
>  
>
http://ant.apache.org/faq.html#delegating-classloader
> 
>   seems to suggest?  (Right at the bottom, under the
> heading "Using The
>   Second Option with Ant 1.6 and later").  This
> leaves me with 'junit.jar'
>   and 'ant-junit.jar' in my 'lib' directory, and
> neither in '$ANT_HOME/lib'.
>   Nope, doesn't work.
> 
> As I said in the intro, my goal isn't just to get
> this to work, but to get
> it to work in a way I feel comfortable showing to
> undergraduate students.
> Advice would be welcome.
> 
> Thanks,
> Greg
> 
>
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> 



		
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