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From "Kevin Sutter (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-385) IndexOutOfBounds exception when parsing ".class" files
Date Wed, 26 Sep 2007 23:04:50 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12530590
] 

Kevin Sutter commented on OPENJPA-385:
--------------------------------------

Ran into a little snag with my proposal...  All of this metadata processing code is in "lib"
and "lib" doesn't have an associated configuration or logfactory, so I don't have a means
to log the failing class name.  I looked at alternatives of setting a configuration object
on the ClassAnnotationMetaDataFilter, but that gets ugly real fast.  And, for how much benefit?
 Since a malformed .class file is no better than a file that does not have the .class suffix,
why not treat them the same?  That is, just return "false" when we detect a malformed .class
file?  I would still put a comment in the code block indicating why we're eating the exception.
 I'll post a patch shortly so that you can see what I am referring to.

Kevin

> IndexOutOfBounds exception when parsing ".class" files
> ------------------------------------------------------
>
>                 Key: OPENJPA-385
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-385
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: lib
>    Affects Versions: 1.0.0, 1.0.1, 1.1.0
>            Reporter: Kevin Sutter
>            Assignee: Kevin Sutter
>             Fix For: 1.0.1, 1.1.0
>
>
> When finding and parsing files via the classpath, we're hitting a situation where an
invalid .class file is in the classpath.  Although the files in question have the .class suffix,
they do not have valid .class format.  Not only are we blowing up via the serp utilities,
but neither jad nor javap can recognize the files either.  Here's the call stack that is produced:
> Exception in thread "main" java.lang.ClassFormatError: COM/ibm/db2os390/sqlj/custom/DB2SQLJCustomizer.class
>         at org.apache.openjpa.lib.meta.ClassAnnotationMetaDataFilter.matches(ClassAnnotationMetaDataFilter.java:89)
>         at org.apache.openjpa.lib.meta.ZipFileMetaDataIterator.hasNext(ZipFileMetaDataIterator.java:79)
>         at org.apache.openjpa.lib.meta.MetaDataIteratorChain.hasNext(MetaDataIteratorChain.java:76)
>         at org.apache.openjpa.lib.meta.ClassArgParser.mapTypeNames(ClassArgParser.java:277)
>         at org.apache.openjpa.meta.AbstractCFMetaDataFactory.scan(AbstractCFMetaDataFactory.java:713)
>         at org.apache.openjpa.meta.AbstractCFMetaDataFactory.getPersistentTypeNames(AbstractCFMetaDataFactory.java:583)
>         at org.apache.openjpa.meta.MetaDataRepository.getPersistentTypeNames(MetaDataRepository.java:1190)
>         at org.apache.openjpa.meta.MetaDataRepository.loadPersistentTypes(MetaDataRepository.java:1207)
>         at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:1002)
>         at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:977)
>         at org.apache.openjpa.jdbc.meta.MappingTool.main(MappingTool.java:918)
> Caused by: java.lang.ArrayIndexOutOfBoundsException
>         at serp.bytecode.lowlevel.ConstantPoolTable.readByte(ConstantPoolTable.java:106)
>         at serp.bytecode.lowlevel.ConstantPoolTable.readUnsignedShort(ConstantPoolTable.java:114)
>         at serp.bytecode.lowlevel.ConstantPoolTable.readUnsignedShort(ConstantPoolTable.java:184)
>         at org.apache.openjpa.lib.meta.ClassAnnotationMetaDataFilter.matches(ClassAnnotationMetaDataFilter.java:67)
>         ... 10 more
> As you can see, the file in question is actually coming from the db2jcc.jar.  Although
I could pursue why these files do not have the correct format, I'm proposing that we become
more lenient in our "matches" logic.  Right now, we are throwing this IOOB exception.  This
seems too harsh, especially since we just return "false" for any other indication that the
resource is not an "interesting" class file with appropriate annotations.  In my mind, this
invalid class file should just be treated as if it didn't have the .class suffix.
> So, instead of the current exception throwing processing, I would like to change to just
log a trace message.  We already log an Info message for all of the files that we do process.
 And, logging an info message for a bad class format might just cause confusion (much like
this exception throwing).  Thus, I would like to just log a trace message with the appropriate
information and return "false" on this matches() invocation.
> Any problems with this approach?  I've looked at the caller's of this method and nobody
is expecting to get the ClassFormatException or IOOB exception (unexpected runtime exception),
so just logging and eating the exception and returning false looks safe.
> Kevin

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