Problems while using the Maven plugin with Swing

Hi, I'm running the Middlegen plugin for Maven. So far it works fine, except 
when I specify the following property:

maven.middlegen.0.gui=true

to see the Swing GUI. I get the following exception:

<exception-start>
middlegen:run:
    [echo] Starting middlegen generation (appname=hibernate-examples, 
config_index = 0)
Database URL:jdbc:mysql://localhost:3306/test
    [middlegen] No <table> elements specified. Reading all tables. This 
might take a while...
********************************************************
* CTRL-Click relations to modify their cardinality     *
* SHIFT-Click relations to modify their directionality *
********************************************************
java.lang.NullPointerException
        at javax.swing.ImageIcon.<init>(ImageIcon.java:138)
        at middlegen.swing.JMiddlegenFrame.<init>(JMiddlegenFrame.java:127)
        at middlegen.MiddlegenTask.execute(MiddlegenTask.java:455)
        at org.apache.tools.ant.Task.perform(Task.java:341)
        at org.apache.commons.jelly.tags.ant.AntTag.doTag(AntTag.java:185)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:233)
        at org.apache.commons.jelly.tags.core.IfTag.doTag(IfTag.java:88)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:233)
        at 
org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:173)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:79)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:110)
        at com.werken.werkz.Goal.fire(Goal.java:639)
        at com.werken.werkz.Goal.attain(Goal.java:575)
        at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
        at com.werken.werkz.Goal.attain(Goal.java:573)
        at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
        at 
org.apache.maven.jelly.tags.werkz.MavenAttainGoalTag.doTag(MavenAttainGoalTag.java:127)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:233)
        at 
com.werken.werkz.jelly.PreGoalTag$1.firePreGoal(PreGoalTag.java:87)
        at com.werken.werkz.Goal.firePreGoalCallbacks(Goal.java:691)
        at com.werken.werkz.Goal.fire(Goal.java:616)
        at com.werken.werkz.Goal.attain(Goal.java:575)
        at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
        at com.werken.werkz.Goal.attain(Goal.java:573)
        at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
        at com.werken.werkz.Goal.attain(Goal.java:573)
        at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
        at com.werken.werkz.Goal.attain(Goal.java:573)
        at com.werken.werkz.Goal.attainPrecursors(Goal.java:488)
        at com.werken.werkz.Goal.attain(Goal.java:573)
        at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
        at 
org.apache.maven.jelly.tags.werkz.MavenAttainGoalTag.doTag(MavenAttainGoalTag.java:127)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:79)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:110)
        at com.werken.werkz.Goal.fire(Goal.java:639)
        at com.werken.werkz.Goal.attain(Goal.java:575)
        at 
org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:671)
        at org.apache.maven.MavenSession.attainGoals(MavenSession.java:263)
        at 
org.apache.maven.jelly.tags.maven.ReactorTag.doTag(ReactorTag.java:368)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:79)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:110)
        at com.werken.werkz.Goal.fire(Goal.java:639)
        at com.werken.werkz.Goal.attain(Goal.java:575)
        at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
        at 
org.apache.maven.jelly.tags.werkz.MavenAttainGoalTag.doTag(MavenAttainGoalTag.java:127)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:79)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:110)
        at com.werken.werkz.Goal.fire(Goal.java:639)
        at com.werken.werkz.Goal.attain(Goal.java:575)
        at 
org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:671)
        at org.apache.maven.MavenSession.attainGoals(MavenSession.java:263)
        at org.apache.maven.cli.App.doMain(App.java:488)
        at org.apache.maven.cli.App.main(App.java:1239)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at com.werken.forehead.Forehead.run(Forehead.java:551)
        at com.werken.forehead.Forehead.main(Forehead.java:581)

BUILD FAILED
File...... 
D:\MySite\maven\cache\maven-multiproject-plugin-1.3.1\plugin.jelly
Element... maven:reactor
Line...... 217
Column.... 9
Unable to obtain goal [multiproject:install-callback] --  
D:\MySite\maven\cache\maven-middlegen-plugin-2.1\plugin.je
lly:105:27: <jelant:middlegen> java.lang.NullPointerException
Total time: 5 seconds
Finished at: Thu Aug 04 20:49:36 BST 2005

<exception-end>

Am I missing something? BTW, it works fine with the taskdef, but I'm using 
the Maven plugin because I'd like to avoid Ant :)

Marco 


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