I've looked through the archive and I located similar problems, but I couldn't find a solution that I was able to apply to my case:

Calling webdoclet like this:

<webdoclet destdir="${project.web-inf.dir}"
  excludedtags="@version,@author"
  verbose="true">
    <fileset dir="${project.gen-src.dir}">
       <include name="**/web/**/*.java" />
    </fileset>

    <deploymentdescriptor
        servletspec="2.3"
        validatexml="true"
        mergedir="${project.src.dir}/xdoclet"/>
    <strutsconfigxml
        destdir="${project.web-inf.dir}">
        <configParam name="version" value="1.0"/>
    </strutsconfigxml>
  </webdoclet>

causes the following invocation error:

[webdoclet] 2004-03-01 10:27:30,140 (xdoclet.ConfigParamIntrospector.fillConfigParamsHashMapUsingReflectionFor) - name=setEngine
[webdoclet] 2004-03-01 10:27:30,140 (xdoclet.ConfigParamIntrospector.fillConfigParamsHashMapUsingReflectionFor) - propertyName=engine
[webdoclet] 2004-03-01 10:27:30,140 (xdoclet.ConfigParamIntrospector.fillConfigParamsHashMapUsingReflectionFor) - capitalPropertyName=Engine
[webdoclet] 2004-03-01 10:27:30,156 (xdoclet.ConfigParamIntrospector.fillConfigParamsHashMapUsingReflectionFor) - InvocationTargetException
[webdoclet] java.lang.reflect.InvocationTargetException
[webdoclet] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[webdoclet] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)


[webdoclet] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

[webdoclet] at java.lang.reflect.Method.invoke(Method.java:324)
[webdoclet] at xdoclet.ConfigParamIntrospector.fillConfigParamsHashMapUsingReflectionFor(ConfigParamIntrospector.java:187)


[webdoclet] at xdoclet.ConfigParamIntrospector.fillConfigParamsFor(ConfigParamIntrospector.java:113)

[webdoclet] at xdoclet.DocletTask.getConfigParams(DocletTask.java:439)
[webdoclet] at xdoclet.DocletTask.createContext(DocletTask.java:611)
[webdoclet] at xdoclet.DocletTask.validateSubTasks(DocletTask.java:513)
[webdoclet] at xdoclet.DocletTask.validateOptions(DocletTask.java:487)
[webdoclet] at xdoclet.modules.web.WebDocletTask.validateOptions(WebDocletTask.java:21)
[webdoclet] at xjavadoc.ant.XJavadocTask.execute(XJavadocTask.java:80)
[webdoclet] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[webdoclet] at org.apache.tools.ant.Task.perform(Task.java:401)
[webdoclet] at org.apache.tools.ant.Target.execute(Target.java:338)
[webdoclet] at org.apache.tools.ant.Target.performTasks(Target.java:365)
[webdoclet] at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
[webdoclet] at org.apache.tools.ant.Project.executeTargets(Project.java:1094)
[webdoclet] at org.apache.tools.ant.Main.runBuild(Main.java:669)
[webdoclet] at org.apache.tools.ant.Main.startAnt(Main.java:220)
[webdoclet] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:215)
[webdoclet] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:90)
[webdoclet] Caused by: java.lang.IllegalStateException: Engine is null?!
[webdoclet] at xdoclet.TemplateSubTask.getEngine(TemplateSubTask.java:172)
[webdoclet] ... 22 more


Any hints on what I may be missing are much appreciated.

Andreas



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