It turned out to be a little tricky as everything compiled well during programming but if i tried to run the project the glassfish server complained about missing implementation of an abstract method. The key point is groov’s joint compilation. If you run a netbeans project it executes an ant build.xml file which can be found in the root project folder. This file is pretty empty as it imports the main compile and deploy tasks from another ant file in the “nbproject” folder.

Now you can customize the build.xml file to enable joint compilation. For this you have to modify the build.xml file in this way:

1. Insert this after the import tag:

<taskdef name=”groovyc”  classname=”org.codehaus.groovy.ant.Groovyc” />

2. Copy the target “-init-macrodef-javac” from the nbproject/build-impl.xml file to the end of the build.xml file. You have to modify the target like:

<target name=”-init-macrodef-javac”>
        <macrodef name=”javac” uri=”http://www.netbeans.org/ns/web-project/2“>
            <attribute default=”${src.dir}” name=”srcdir”/>
            <attribute default=”${build.classes.dir}” name=”destdir”/>
            <attribute default=”${javac.classpath}:${j2ee.platform.classpath}” name=”classpath”/>
            <attribute default=”${includes}” name=”includes”/>
            <attribute default=”${excludes}” name=”excludes”/>
            <attribute default=”${javac.debug}” name=”debug”/>
            <attribute default=”${empty.dir}” name=”gensrcdir”/>
            <element name=”customize” optional=”true”/>
            <sequential>
                <property location=”${build.dir}/empty” name=”empty.dir”/>
                <mkdir dir=”${empty.dir}”/>
                <groovyc   destdir=”@{destdir}” encoding=”${source.encoding}” excludes=”@{excludes}” includeantruntime=”false” includes=”@{includes}”  srcdir=”@{srcdir}” >
                    <src>
                        <dirset dir=”@{gensrcdir}” erroronmissingdir=”false”>
                            <include name=”*”/>
                        </dirset>
                    </src>
                    <classpath>
                        <path path=”@{classpath}”/>
                    </classpath>
                    <javac source=”${javac.source}” target=”${javac.target}” debug=”on” deprecation=”${javac.deprecation}”>
                        <compilerarg line=”${endorsed.classpath.cmd.line.arg}”/>
                        <compilerarg line=”${javac.compilerargs}”/>
                        <customize/>
                    </javac>
                </groovyc>
            </sequential>
        </macrodef>
    </target>

Look how we integrated the groovyc compiler which first compiles the groovy sources and afterwards the java sources with nested <javac>

3. You should extend the nbproject/project.properties with:  build.classes.excludes=**/*.java,**/*.form,**/*.groovy

Otherwise groovy source files will be deployed along with the class files.

Now you can run your project from netbeans 6.8 with the RUN button.

Have fun!

-startup
plugins/org.eclipse.equinox.launcher_1.0.201.R35x_v20090715.jar
–launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.0.200.v20090519
-showsplash
org.eclipse.platform
–launcher.XXMaxPermSize
256m
-vm
C:\Program Files\Java\jdk1.6.0_16\bin\javaw.exe
-vmargs
-Xms40m
-Xmx256m

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