[jira] [Commented] (GROOVY-7083) PermGen memory leak in ConfigSlurper.parse(Script script, URL location)

[Jochen Kemnade (JIRA)]

    [ 
https://issues.apache.org/jira/browse/GROOVY-7083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16010064#comment-16010064
 ] 

Jochen Kemnade commented on GROOVY-7083:
----------------------------------------

I let the script run with 1000 iterations and took a heap dump. It contains 
about 180k instances of {{MetaMethodIndex$Entry}}.
They look like this:
{noformat}
this     - value: org.codehaus.groovy.runtime.metaclass.MetaMethodIndex$Entry 
#177145
 <- [251]     - class: 
org.codehaus.groovy.runtime.metaclass.MetaMethodIndex$Entry[], value: 
org.codehaus.groovy.runtime.metaclass.MetaMethodIndex$Entry #177145
  <- table     - class: org.codehaus.groovy.runtime.metaclass.MetaMethodIndex, 
value: org.codehaus.groovy.runtime.metaclass.MetaMethodIndex$Entry[] #1009
   <- metaMethodIndex     - class: groovy.lang.ExpandoMetaClass, value: 
org.codehaus.groovy.runtime.metaclass.MetaMethodIndex #1009
    <- strongMetaClass     - class: org.codehaus.groovy.reflection.ClassInfo, 
value: groovy.lang.ExpandoMetaClass #987
     <- value     - class: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7$EntryWithValue, value: 
org.codehaus.groovy.reflection.ClassInfo #1239
      <- [0]     - class: java.lang.Object[], value: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7$EntryWithValue #1239
       <- [65]     - class: java.lang.Object[], value: java.lang.Object[] 
#139278
        <- table     - class: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7$GroovyClassValuePreJava7Segment,
 value: java.lang.Object[] #111688
         <- [14]     - class: 
org.codehaus.groovy.util.AbstractConcurrentMapBase$Segment[], value: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7$GroovyClassValuePreJava7Segment
 #15
          <- segments     - class: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7$GroovyClassValuePreJava7Map,
 value: org.codehaus.groovy.util.AbstractConcurrentMapBase$Segment[] #1
           <- map     - class: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7, value: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7$GroovyClassValuePreJava7Map
 #1
            <- globalClassValue     - class: 
org.codehaus.groovy.reflection.ClassInfo, value: 
org.codehaus.groovy.reflection.GroovyClassValuePreJava7 #1
{noformat}


> PermGen memory leak in ConfigSlurper.parse(Script script, URL location)
> -----------------------------------------------------------------------
>
>                 Key: GROOVY-7083
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7083
>             Project: Groovy
>          Issue Type: Bug
>          Components: groovy-jdk
>    Affects Versions: 2.3.6, 2.4.1
>            Reporter: Marcin Erdmann
>
> The following will quite quickly result in a java.lang.OutOfMemoryError: 
> PermGen space:
> {code}
> while(true) {
>     new ConfigSlurper().parse("")
> }
> {code}
> This is due to ConfigSlurper.parse(Script script, URL location) modifying 
> meta class of the compiled config script class and not clearing it afterwards 
> which means that there is reference to that class in meta class registry and 
> it never gets garbage collected.
> The exception does not occur for the following:
> {code}
> while (true) {
>     new ConfigSlurper() {
>         ConfigObject parse(Script script, URL location) {
>             def config = super.parse(script, location)
>             GroovySystem.metaClassRegistry.removeMetaClass(script.class)
>             config
>         }
>     }.parse("")
> }
> {code}



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