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From "Daniel John Debrunner (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-176) Derby throws ERROR XBCM1: Java linkage error thrown during load of generated class org.apache.derby.exe.aced07c066x0102xca87x3319x00004aa5686e1 during execution of large query
Date Wed, 06 Apr 2005 17:25:20 GMT
     [ http://issues.apache.org/jira/browse/DERBY-176?page=comments#action_62286 ]
     
Daniel John Debrunner commented on DERBY-176:
---------------------------------------------

Kathey Marsden and myself made a number of changes in IBM's Cloudscape 5.1 codeline to make
progress in this area and address an urgent customer issue. They fall into Jack's 1) and 2)
categories, generate less code and split methods up into multiple methods. In addition some
simple checks are made to ensure the structure of the class file is not corrupted by exceeding
limits. These checks are made before handing the class off to the class loader/verifier.

I'll migrate these changes to Derby's trunk and add notes for them in this bug.

> Derby throws ERROR XBCM1: Java linkage error thrown during load of generated class org.apache.derby.exe.aced07c066x0102xca87x3319x00004aa5686e1
during execution of large query
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-176
>          URL: http://issues.apache.org/jira/browse/DERBY-176
>      Project: Derby
>         Type: Bug
>   Components: SQL
>     Versions: 10.0.2.0, 10.0.2.1, 10.0.2.2, 10.1.0.0
>     Reporter: Kathey Marsden
>     Assignee: Kathey Marsden
>  Attachments: largeCodeGen.java
>
> When executing a large query or oather large operations, Derby throws a java linkage
exception.
> This is because the generated byte code exceeds the JVM limits for method sizes constant
pool entries etc, the amount of code in a conditional etc.  The attached repro demonstrates
the problem but the problem can also occur for other operations that generate lots of byte
code.  The repro is just a new functional test,
> so should be copied to derbyTesting/functionTests/lang/largeCodeGen.java and run like
>  java -Djvmflags=-Xmx512M org.apache.derbyTesting.harness.RunTest lang/largeCodeGen
> When this problem is fixed additional scenarios should be added to this test.
> ERROR XBCM1: Java linkage error thrown during load of 
> generated class org.apache.derby.exe.aced07c066x0102xca87x3319x00004aa5686e1.
> 	at org.apache.derby.iapi.error.StandardException.newException(StandardException.java:315)
> 	at org.apache.derby.impl.services.reflect.DatabaseClasses.loadGeneratedClass(DatabaseClasses.java:162)
> 	at org.apache.derby.impl.services.bytecode.GClass.getGeneratedClass(GClass.java:59)
> 	at org.apache.derby.impl.sql.compile.ExpressionClassBuilder.getGeneratedClass(ExpressionClassBuilder.java:920)
> 	at org.apache.derby.impl.sql.compile.StatementNode.generate(StatementNode.java:270)
> 	at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:432)
> 	at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:107)
> 	at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:688)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(EmbedPreparedStatement.java:118)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(EmbedPreparedStatement20.java:82)
> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(EmbedPreparedStatement30.java:62)
> 	at org.apache.derby.jdbc.Driver30.newEmbedPreparedStatement(Driver30.java:92)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(EmbedConnection.java:675)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(EmbedConnection.java:519)
> 	at org.apache.derbyTesting.functionTests.tests.lang.largeCodeGen.main(largeCodeGen.java:86)
> Exception in thread "main" 

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