[GROOVY-5187] Groovy Script Engine creates new classes for each script and doesn't get garbage collected

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.4, 2.0-beta-1
• Fix Version/s: 2.0.6, 1.8.9
• Component/s: GroovyScriptEngine
• Assignee: Jochen Theodorou
• Reporter: James Thornton
• Created: 12/Dec/11 16:36
• Updated: 22/Dec/12 01:10
• Resolved: 17/Dec/12 08:41

Description

New classes are created for each script:

https://github.com/groovy/groovy-core/blob/master/src/main/org/codehaus/groovy/jsr223/GroovyScriptEngineImpl.java#L109

Which are added to the classMap, which grows and old classes don't get garbage collected:

https://github.com/groovy/groovy-core/blob/master/src/main/org/codehaus/groovy/jsr223/GroovyScriptEngineImpl.java#L338

This results in PermGen errors:

Rexster Groovy Script Engine
https://github.com/tinkerpop/rexster/issues/143

Neo4j Server Groovy Script Engine
http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-Feedback-after-evaluation-tp3569774p3574520.html

There is no public way of removing older scripts and the HashMap is not a LinkedHashMap with LRU enabled for storing them. Right now the Neo4j workaround is to recreated the GSE every 500 requests.