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Note: This is not (NOT!) the run() method from the java.lang.Runnable interface. Nor is this codified as an interface in the IzPack javadoc.  Instead, this would seem to be a magic method signature that is otherwise undocumented.

a. Contents of a minimal file that matches the requirements:

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This class uses the com.izforge.izpack.panels.process.AbstractUIProcessHandler class to log output into a calling ProcessPanel. See the IzPack javadoc for details. 

b.  Compile your Java class

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The ProcessPanel.Spec.xml file holds the XML configuration for the external Java class you want to execute.

<installation>
   ...

  <resources>
    <res id="ProcessPanel.Spec.xml" src="installer/ProcessPanel.Spec.xml"/>
    ...
  </resources>

  ...
</installation>


 

b.  Reference your JAR

At the top level of the install.xml file, add a reference to your JAR file containing the class.

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<installation>

  <resources>
    <res id="ProcessPanel.Spec.xml" src="installer/ProcessPanel.Spec.xml"/>
  </resources>


  ...

  <jar src="path/to/hello.jar" stage="install"/>

  ....

</installation>

Adding the jar element inear the <resources> definition is a good idea.

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<installation>

  <resources>
    <res id="ProcessPanel.Spec.xml" src="installer/ProcessPanel.Spec.xml"/>
  </resources>

  ...

  <jar src="path/to/hello.jar" stage="install"/>

  ....

  ...
  <panels>
    ...
    <panel classname="ProcessPanel"/>
  </panels>
  ....
</installation>

...

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3. Create the ProcessPanel.Spec.xml file

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