Eclipse changed in incompatible ways between 4.2 and 4.3 in ways that affect plug-ins. The following entries describe the areas that changed and provide instructions for migrating 4.2 plug-ins to 4.3. Note that you only need to look here if you are experiencing problems running your 4.2 plug-in on 4.3.
See also the list of deprecated API removals for this release.
What is affected: Clients that directly reference Lucene API included in the platform.
Description: The Eclipse platform help system has migrated from Lucene 2.9.1 to Lucene 3.5. This change brings improved performance and many bug fixes in help search. However, Lucene itself has changed in incompatible ways between their 2.9 and 3.5 releases. See the Lucene Change Log for complete details.
Action required: Clients that directly use Lucene APIs should refer to the Lucene change log for details on what has changed.