i checked out the 4.x branch this afternoon but was not able to build it.
Failed tests:
testDynamicRulesAddRemove(org.drools.integrationtests.DynamicRulesTest)
testRuleBaseAddRemoveSubNetworks(org.drools.integrationtests.DynamicRulesTest)
Tests run: 621, Failures: 2, Errors: 33, Skipped: 0
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] There are test failures.
Please refer to D:\download\drools4x\4.0.x\drools-compiler\target\surefire-reports for the individual test results.
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7 minutes 7 seconds
[INFO] Finished at: Mon Mar 17
17:12:13 PDT 2008
[INFO] Final Memory: 7M/38M
[INFO] ------------------------------------------------------------------------