Help with java classpath...

[Fred Janon <fj...@yahoo.com>]

Hi,

I am trying to write an Ant build.xml file to compile and run a Java
(Groovy) app without too much success. I spent a day reading the Ant
manual and trying all sorts of things. The ant file builds the classes
correctly but apparently fails to include the current directory at
runtime. I think my classpath in the Ant file is not specified
properly, I can't get Ant to include the current directory in the java
classpath. I can run my app from the Windows command line like the
following and that's what I want Ant to run:

C:\Groovy_JPADownstream>java -cp
./lib/derby.jar;./lib/derbyclient.jar;./lib/toplink-essentials.jar;%GROOVY_HOME%/embeddable/groovy-all-1.5.4.jar;./classes;.
downstream/PopulateDownstream

but when I run the Ant file I get the following error message that
seems to indicate that the "META-INF\persistence.xml" file is not found
by JPA:

     [java] java.lang.NullPointerException
     [java]     at
oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:120)
     [java]     at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)

meaning that it doesn't see the META-INF/persistence.xml file from the
current directory

Here are the build file and the file structure:

<project name = "GroovyJPA" default = "run" basedir = ".">
  <property environment = "env"/>
  <property name = "persistenceconfig.dir" location = "**/*"/> <!-- We
need the current dir here -->
  <property name = "lib.dir" location = "lib"/>
  <property name = "src.dir" location = "src"/>
  <property name = "classes.dir" location = "classes"/>

    <!-- Groovy jar -->
  <path id = "groovy.classpath">
    <fileset dir = "${env.GROOVY_HOME}/embeddable/"/>
  </path>

  <!-- Application jars: DerbyDB, JPA Toplink + persistence.xml -->
  <path id = "app.classpath">
    <fileset dir = "${env.GROOVY_HOME}/embeddable/"/>
    <pathelement location="${classes.dir}"/>
    <!-- Should be:
../lib/derby.jar;../lib/derbyclient.jar;../lib/toplink-essentials.jar
-->
    <fileset dir = "${lib.dir}"/>
    <!-- /META-INF/persistence.xml -->
    <pathelement location="${persistenceconfig.dir}"/>
  </path>

  <taskdef name ="groovyc"
    classname = "org.codehaus.groovy.ant.Groovyc"
    classpathref = "groovy.classpath"/>

  <target name = "compile">
    <mkdir dir = "${classes.dir}"/>
    <groovyc
      destdir = "${classes.dir}"
      srcdir = "${src.dir}"
      includes = "*.groovy"
      classpathref = "app.classpath"
      />
  </target>

<!-- This works: C:\Groovy_JPADownstream>java -cp
./lib/derby.jar;./lib/derbyclient.jar;./lib/toplink-essentials.jar;%GROOVY_HOME%/embeddable/groovy-all-1.5.4.jar;./classes;.
downstream/PopulateDownstream -->
  <target name = "run" depends = "compile">
    <java classname = "downstream.PopulateDownstream">
        <classpath refid = "app.classpath"/>
    </java>
  </target>
</project>

==================

C:\Groovy_JPADownstream\build.xml

C:\Groovy_JPADownstream\lib
C:\Groovy_JPADownstream\lib\derby.jar
C:\Groovy_JPADownstream\lib\derbyclient.jar
C:\Groovy_JPADownstream\lib\toplink-essentials-agent.jar
C:\Groovy_JPADownstream\lib\toplink-essentials.jar

C:\Groovy_JPADownstream\META-INF
C:\Groovy_JPADownstream\META-INF\persistence.xml

C:\Groovy_JPADownstream\src
C:\Groovy_JPADownstream\src\Location.groovy
C:\Groovy_JPADownstream\src\LocationType.groovy
C:\Groovy_JPADownstream\src\PopulateDownstream.groovy
C:\Groovy_JPADownstream\src\QueryDownstream.groovy

C:\Groovy_JPADownstream\classes
C:\Groovy_JPADownstream\classes\downstream
C:\Groovy_JPADownstream\classes\downstream\Location.class
C:\Groovy_JPADownstream\classes\downstream\LocationType.class
C:\Groovy_JPADownstream\classes\downstream\PopulateDownstream.class
C:\Groovy_JPADownstream\classes\downstream\QueryDownstream.class

Thanks,

Fred

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