NullPointerException in JAXB

Question

Hi all,
I have a problem with JAXB. I installed the jwsdp-1_6-windows-i586.exe,
and made some test running the xjc using the command line. It works fine,
all Classes has been created and compiled. Furthermore I wanted to use it
within eclipse. I created a new Project, copied all needed libs into it,
but I got a NPE:
E:\eclipse>E:\java\j2sdk1.4.2_04\bin\java -Djava.endorsed.dirs=E:\workspace\_internTestJAXB\lib;E:\workspace\_internTestJAXB\lib\endorsed -jar E:\workspace\_internTestJAXB\lib\jaxb-xjc.jar E:\workspace\_internTestJAXB\xsd\faa.xsd -p de.jaxb.bo -d E:\workspace\_internTestJAXB\src\
parsing a schema...
compiling a schema...
Exception in thread "main" java.lang.NullPointerException
at com.sun.tools.xjc.generator.SkeletonGenerator.generateStaticRuntime(SkeletonGenerator.java:238)
at com.sun.tools.xjc.generator.SkeletonGenerator.<init>(SkeletonGenerator.java:130)
at com.sun.tools.xjc.generator.SkeletonGenerator.generate(SkeletonGenerator.java:110)
at com.sun.tools.xjc.Driver.generateCode(Driver.java:379)
at com.sun.tools.xjc.Driver.run(Driver.java:220)
at com.sun.tools.xjc.Driver._main(Driver.java:80)
at com.sun.tools.xjc.Driver.access$000(Driver.java:46)
at com.sun.tools.xjc.Driver$1.run(Driver.java:60)
Someone an idea what's wrong?
Thanks in advance,
zzkozak

Answer 1

It looks like a build path problem with your Eclipse project. Why not try an Ant script such as the following? It's much easier than using xjc from the command line.
<?xml version="1.0" standalone="yes"?>
<project name="DataExtract JAXB Build" basedir="." default="run">
     <description>
          Controls the JAXB XML schema and Java compilations and wraps the results into a JAR file.
    </description>
     <!-- Change this property to point to the JWSDP installation directory on your machine.  -->
     <property name="jwsdp.home" value="C:\Program Files\Java\jwsdp-1.6" />
     <path id="classpath">
          <pathelement path="src" />
          <fileset dir="${jwsdp.home}" includes="jaxb/lib/*.jar" />
          <fileset dir="${jwsdp.home}" includes="jwsdp-shared/lib/*.jar" />
          <fileset dir="${jwsdp.home}" includes="jaxp/lib/**/*.jar" />
     </path>
     <taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">
          <classpath refid="classpath" />
     </taskdef>
     <target name="run" description="Compile the XML schemas and all the Java source files they create.">
          <echo message="Compiling the Schema..." />
          <mkdir dir="tmpClasses" />
          <mkdir dir="tmpSource"/>
          <echo message="Doing forum.xsd..." />
          <xjc schema="forum.xsd" package="extract" target="tmpSource" />
          <echo message="Compiling the java source files..." />
          <javac srcdir="tmpSource" destdir="tmpClasses" debug="on" >
               <classpath refid="classpath" />
          </javac>
          <echo message="Bundling the generated classes and source files into forum.jar"/>
          <jar destfile="forum.jar" update="true">
               <fileset dir="tmpClasses"/>     
               <fileset dir="tmpSource"/>
          </jar>
          <echo message="Cleaning up the working directories."/>          
          <delete dir="tmpClasses"/>
          <delete dir ="tmpSource"/>
     </target>
</project>Copy this script into a file called build.xml within your Eclipse project. Change the value of jwsdp.home to the location of your JWSDP installation, and change the name of the Schema. With the script and the Schema in the same directory, right-click on the file and select Run As -> Ant Build.
This script bundles the generated classes into a jar file and and then deletes the source. But, you can play around with it if you want to do something else.