[news.eclipse.tools] javadoc: why does Main.execute not work in plugins?

["Student" <boheme42@xxxxxxxx>]

I'm using M5, sun jdk1.4.1_01 on W2k. If I try to start javadoc with
a special doclet (derived from doclet Standard) via com.sun.tools.javadoc
Main.execute(arguments) inside a plugin, javadoc
complains about a missing start method (which is present).

Console output:
Loading source files for package test...
Constructing Javadoc information...
javadoc: Doclet class documentation.doclet.SpecialDoclet does not contain a
start method
1 error

If I start the same doclet-code in an other process by calling
Runtime.getRuntime().exec(arguments), the start-method is
found and executed.

To aviod building another process and handle concurrency issues
I want to use Main.execute(String[]).

I'm going slightly mad by trying to get this running.

When I try to debug this, no source is attached, because I
don't have the javadoc source.
I suspect the plugin-classloader to play a mayor role in this case, because
it seems to be the only big difference (of the two start-methods). Am I
wrong?

To get access to Main.execute(...) I've copied tools.jar form sun jdk into
my projekt directory
and make a <runtime> <library>-entry in plugin.xml. I hope this is not
causing any problems.

Please help.

Grateful for any hint
  Hilger