Threads in BLOCKED state in ProjectClassLoader and ParseTools ------------------------------------------------------------- Key: DROOLS-1567 URL: https://issues.jboss.org/browse/DROOLS-1567 Project: Drools Issue Type: Enhancement Components: core engine Affects Versions: 6.5.0.Final Reporter: Arkady Syamtomov Assignee: Mario Fusco Building the knowledge bases in parallel threads does not scale due to the recurrent synchronised call of Class.forName, detected in ProjectClassLoader and org.mvel2.util.ParceTools. While in the org.drools.core.common.ProjectClassLoader the classes, if not found, are blacklisted, in the org.mvel2.util.ParceTools there is no blacklist logic implemented at all. Nevertheless, even with org.drools.core.common.ProjectClassLoader the issue remains, since the internal DRL conditions query are submitted as class names to resolve and with the number of rules growing in the system, the blacklisting of invalid class names is not enough any more: it would be desirable to have an internal hook to filter the names matching a configurable pattern.