[ https://issues.jboss.org/browse/DROOLS-461?page=com.atlassian.jira.plugin... ] Mario Fusco commented on DROOLS-461: ------------------------------------ I must admit you're last comment it's really surprising to me and I don't see how this could be possible. According to IBM an object is a GC root if at least one of this conditions is true http://pic.dhe.ibm.com/infocenter/isa/v4r1m0/index.jsp?topic=%2Fcom.ibm.j... and I don't see anything there that could be applicable to the JavaLexer. The only point where we create a JavaLexer is in the JavaExprAnalyzer: {code} private JavaParser parse(final String expr) { final CharStream charStream = new ANTLRStringStream(expr); final JavaLexer lexer = new JavaLexer( charStream ); final TokenStream tokenStream = new CommonTokenStream( lexer ); return new JavaParser( tokenStream ); } {code} and after we have done the parsing the JavaParser, CommonTokenStream and JavaLexer instances created there are all garbage collectable. Can you please send (via dropbox or other similar file sharing platform) the heapdump of your JVM. Without it is impossible for me to figure out what's happening in your case. Thanks again, Mario -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira