DataNucleus with Ant and Ivy
Background

This guide introduces Apache Ant Ivy as tool to manage project dependencies for DataNucleus based applications.

In this quick tutorial you will learn how to use Apache Ant Ivy to compile and enhance persistent classes.

Enhancement

DataNucleus enhances persistent classes during compile time. It's a transparent process when using the JDK 1.6 or upper, otherwise use the DataNucleus Ant Enhancer Task (See Ant Guide).

Build files

There are two ivy files and one traditional ant build file:

  • ivy.xml
  • ivysettings.xml
  • build.xml

The ivy.xml declares the project dependencies to DataNucleus libraries and the ivysettings.xml declares the DataNucleus SNAPSHOT repository.

The ivy.xml file: 

            

<ivy-module version="2.0">
	<info organisation="datanuleus" module="sample" revision="1.0.0" />
	<configurations>
		<conf name="build" description="build dependancies" />
		<conf name="enhancer" extends="build" description="enhancer dependances" />
		<conf name="runtime" extends="build" description="runtime dependances" />
	</configurations>

	<publications>
		<artifact />
	</publications>
	<dependencies>
		<dependency org="org.datanucleus" name="datanucleus-core" rev="1.1-SNAPSHOT" conf="build->default"/>
		<dependency org="org.datanucleus" name="datanucleus-enhancer" rev="1.1-SNAPSHOT" conf="enhancer->default"/>
		<dependency org="asm" name="asm" rev="3.0" conf="enhancer->default"/>
		<dependency org="javax.jdo" name="jdo-api" rev="3.0" conf="build->default"/>
		<dependency org="org.datanucleus" name="datanucleus-rdbms" rev="1.1-SNAPSHOT" conf="runtime->default"/>
	</dependencies>

</ivy-module>

The ivysettings.xml file: 

            

<ivysettings>
  <settings defaultResolver="resolver"/>
  <resolvers>
    <chain name="resolver">
      <url name="datanucleus-nightly" m2compatible="true">
        <artifact 
         pattern="http://www.datanucleus.org/downloads/maven2-nightly/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
      </url>
      <ibiblio name="ibiblio" m2compatible="true"/>
      <filesystem name="repository">
        <ivy pattern="${ivy.settings.dir}/../repository/[organisation]/[module]/[module]-[revision].xml" /> 
        <artifact pattern="${ivy.settings.dir}/../repository/[organisation]/[artifact]/[artifact]-[revision].[ext]" /> 
      </filesystem>		
    </chain>
  </resolvers>
</ivysettings>

The build.xml file: 

            

<project basedir="." default="default" name="build" xmlns:ivy="antlib:org.apache.ivy.ant">
    <property environment="env"/>
    <property name="debuglevel" value="source,lines,vars"/>
    <property name="target" value="1.5"/>
    <property name="source" value="1.5"/>
    <property name="bin" value="bin"/>
    <property name="src" value="src"/>
    <property name="dist" value="target"/>

	<target name="default" depends="retrieve,compile,jar,publish"></target>
	
    <target name="retrieve" description="retrieve dependencies with ivy">
        <ivy:retrieve/>
    	<ivy:cachepath pathid="build.path" conf="build" />
    	<ivy:cachepath pathid="enhancer.path" conf="enhancer" />
    </target>	
    <target name="publish">
    	<ivy:cleancache />
    	
        <ivy:publish deliverivypattern="ivy.xml" resolver="repository" overwrite="true">
        	<artifacts pattern="${dist}/[artifact]-[revision].[ext]"/>
        </ivy:publish>
    </target>
	<target name="compile">
		<delete dir="${bin}" failonerror="true"></delete>
		<mkdir dir="${bin}"/>
        <copy todir="${bin}">
            <fileset dir="${src}" includes="**/**.jdo" />
        </copy>
		<!-- using JDK 1.6 and datanucleus-core+datanucleus-enhancer+asm will enhance the classes automatically --> 
		<!-- MUST use fork, so datanucleus ensures that classes are enhanced before going ahead with the build -->
		<javac srcdir="${src}"
		       destdir="${bin}"
		       source="${source}"
		       target="${target}"
		       debuglevel="${debuglevel}"
		       debug="true"
		       fork="true">
			<classpath refid="build.path"></classpath>
			<classpath refid="enhancer.path"></classpath>
		</javac>
	</target>
	
	<target name="jar">
		<delete dir="${dist}" failonerror="false"></delete>
		<mkdir dir="${dist}"/>
        <jar destfile="${dist}/${ivy.module}-${ivy.revision}.jar">
            <fileset dir="${src}" includes="**/**.jdo" />
            <fileset dir="${bin}"/>
        </jar>
	</target>

</project>