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Running P2 Ant Tasks in Eclipse

If you have the following when executing p2 ant tasks in Eclipse:

Buildfile: C:\projects\p2\build.xml
run:

BUILD FAILED
C:\projects\p2\build.xml:6: Problem: failed to create task or type p2.mirror
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.

Make sure that you run this task in the same JRE as workspace.

How to do that? Go to "Externals Tools Configuration". Choose your ant script. Go to "JRE" tab and select "Run in the same JRE as the workspace".