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LuceneWrapper.jar has been regenerated for the Android version of Greenstone-3.
The key issue was that the version being used in Greenstone:

  gs2build/common-src/indexers/lucene-gs

uses lucene-core-2.3.2.jar

In this version of Lucene, IndexSearcher ultimately inherits from Remote/RMI.
This isn't supported in Android's version of Java that it converts to Dex format.
Shifting to a newer version (2.9.4, the newest version of the 2.x series) moves
the code beyond this reliance.

Command to compile:

  ant common.compile-core
  ant common.jar-cor

(result in build needs to be renamed, and copied to a couples of spots so it
is then included/unjar'd in the Greenstone wrapper code for Lucene)

Another (optional) improvmenent was to compile the lucene, targetted at 1.6.
This is to eliminate 'dx' warning about anonymous classes.  In:

  common-build.xml

locate the source and target 1.4 values, and change to 1.6

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xalan.jar needs to be changed