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From Reto Bachmann-Gmür (JIRA) <j...@apache.org>
Subject [jira] Commented: (CLEREZZA-320) SSP rendering is slow: scala.tool.nsc.interpreter.AbstractFileClassLoader.findClass needs a lot of time to be executed
Date Fri, 08 Oct 2010 17:36:31 GMT

    [ https://issues.apache.org/jira/browse/CLEREZZA-320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919329#action_12919329
] 

Reto Bachmann-Gmür commented on CLEREZZA-320:
---------------------------------------------

Whenever I don't recreate the ClassLoader on every execution
I get the following error:

java.lang.ClassNotFoundException: sun.reflect.MethodAccessorImpl
	at scala.tools.nsc.interpreter.AbstractFileClassLoader.onull$1(AbstractFileClassLoader.scala:21)
	at scala.tools.nsc.interpreter.AbstractFileClassLoader$$anonfun$getBytesForClass$1.apply(AbstractFileClassLoader.scala:26)
	at scala.tools.nsc.interpreter.AbstractFileClassLoader$$anonfun$getBytesForClass$1.apply(AbstractFileClassLoader.scala:25)
	at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
	at scala.collection.immutable.List.foreach(List.scala:45)
	at scala.tools.nsc.interpreter.AbstractFileClassLoader.getBytesForClass(AbstractFileClassLoader.scala:25)
	at scala.tools.nsc.interpreter.AbstractFileClassLoader.findClass(AbstractFileClassLoader.scala:33)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at scala.tools.nsc.interpreter.AbstractFileClassLoader.scala$tools$nsc$util$ScalaClassLoader$$super$loadClass(AbstractFileClassLoader.scala:16)
	at scala.tools.nsc.util.ScalaClassLoader$class.loadClass(ScalaClassLoader.scala:57)
	at scala.tools.nsc.interpreter.AbstractFileClassLoader.loadClass(AbstractFileClassLoader.scala:16)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

The puzzling thing is that if I create a new AbstractFileClassLoader(virtualDirectory, this.getClass.getClassLoader())
it doesn't try to access this class and works.


> SSP rendering is slow: scala.tool.nsc.interpreter.AbstractFileClassLoader.findClass needs
 a lot of time to be executed
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: CLEREZZA-320
>                 URL: https://issues.apache.org/jira/browse/CLEREZZA-320
>             Project: Clerezza
>          Issue Type: Bug
>         Environment: in netbeans, during cpu profiling exclude all java core classes
>            Reporter: Tsuyoshi Ito
>            Priority: Blocker
>         Attachments: org.clerezza.test.render.zip, page_reuest_wo_javacore.png
>
>
> during profiling session we detected that rendering ssp is very slow. A lot of time is
used to execute scala.tool.nsc.interpreter.AbstractFileClassLoader.findClass. Seems that each
execution the classes are (re)loaded. IMO this should not be the case.

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