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  1. Groovy
  2. GROOVY-5187

Groovy Script Engine creates new classes for each script and doesn't get garbage collected

        Details

        • 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
        • Labels:
          None

          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.

            Activity

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            blackdrag Jochen Theodorou added a comment -

            As there have been a conflict with GROOVY-5786 this feature now has to be activated. that means the engine will by default not forget global functions and attached classes. See http://groovy.codehaus.org/JSR+223+Scripting+with+Groovy for how to activate it

            Show
            blackdrag Jochen Theodorou added a comment - As there have been a conflict with GROOVY-5786 this feature now has to be activated. that means the engine will by default not forget global functions and attached classes. See http://groovy.codehaus.org/JSR+223+Scripting+with+Groovy for how to activate it
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            blackdrag Jochen Theodorou added a comment -

            Because of me taking the wrong map GROOVY-5706 was filled and that has a major effect on the fix released in 1.8.8 and 2.0.2, till the point the jsr223 module my not really work anymore. Thus a new fix was required, changing the fix version for this issue

            Show
            blackdrag Jochen Theodorou added a comment - Because of me taking the wrong map GROOVY-5706 was filled and that has a major effect on the fix released in 1.8.8 and 2.0.2, till the point the jsr223 module my not really work anymore. Thus a new fix was required, changing the fix version for this issue
            Hide
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            blackdrag Jochen Theodorou added a comment -

            I made the map a soft reference based one. It can now forget entries over time. OOME can still happen of course, since class unloading is not always done as it should by the JVM, but the cases are very much reduced. This solution is kind of a middle ground. A LRU could still cause OOME, on the other hand the engine is originally not created to forget classes.

            Show
            blackdrag Jochen Theodorou added a comment - I made the map a soft reference based one. It can now forget entries over time. OOME can still happen of course, since class unloading is not always done as it should by the JVM, but the cases are very much reduced. This solution is kind of a middle ground. A LRU could still cause OOME, on the other hand the engine is originally not created to forget classes.

              People

              • Assignee:
                blackdrag Jochen Theodorou
                Reporter:
                espeed James Thornton
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                Dates

                • Created:
                  Updated:
                  Resolved:

                  Development