Project: Birt
Bug 123840 Incorrect use of static fields in NEvaluator and FilterPassController
Reported: 2006-01-13 17:17:07 | Status: resolved fixed

Data Engine classes org.eclipse.birt.data.engine.script.NEvaluator and FilterPassController (used for top-n and bottom-n filter process) use static class fields to store proessing data. This is not multi-thread safe. If there are concurrent requests running in the same JVM (even if they use different instances of DataEngine), data corruption will occur since multiple requests may get/set the static fields at the same time. These classes should keep all per-request data in instance fields. Each report query need to have its own instance.

Files changed in fix:
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/FilterPassController.java data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/NEvaluator.java data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/ScriptEvalUtil.java