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https://issues.apache.org/jira/browse/DERBY-4142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698855#action_12698855
]
Rick Hillegas commented on DERBY-4142:
--------------------------------------
I have had good success decompiling the generated code by using the free Jode
decompiler. I find that Jode succeeds where most decompilers fail. In addition,
I have found that the decompiled code is easy to read and can be compiled into
byte code again. Not all decompilers produce compilable code. Here is the
script which I use to drive Jode:
#! /bin/bash
#
# Run the jode decompiler on a class. E.g.:
#
# runjode acf81e0010x011cxddd8xfcabx0000000feab00
classStub=$1
. setupClasspath
export CLASSPATH=$CLASSPATH:$SW/javaDecompilers/jode/jode-1.1.2-pre1.jar:.
echo $CLASSPATH
mkdir org
mkdir org/apache
mkdir org/apache/derby
mkdir org/apache/derby/exe
cp $classStub.class org/apache/derby/exe/
#java -cp $CLASSPATH jode.decompiler.Main --help $*
java -cp $CLASSPATH jode.decompiler.Main org.apache.derby.exe.$classStub
> java.lang.VerifyError causing java.sql.SQLException: Cannot create an
> instance of generated class ... in lang.GeneratedColumnsTest and
> GeneratedColumnsPermsTest on IBM iseries
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-4142
> URL: https://issues.apache.org/jira/browse/DERBY-4142
> Project: Derby
> Issue Type: Bug
> Affects Versions: 10.5.1.0
> Environment: IBM iseries (AS 400) with ibm 1.5 (build 1.5.0_13-b05)
> Reporter: Myrna van Lunteren
>
> This results in 22 errors.
> Here's the stack trace with an insane build:
> 1)
> test_005_basicInsert(org.apache.derbyTesting.functionTests.tests.lang.GeneratedColumnsTest)java.sql.SQLException:
> Cannot create an instance of generated class
> org.apache.derby.exe.acd83d18d1x0120x62bdx2dffxffffb19003081.
> at java.lang.Throwable.<init>(Throwable.java:196)
> at java.lang.Exception.<init>(Exception.java:41)
> at java.sql.SQLException.<init>(SQLException.java:40)
> at org.apache.derby.impl.jdbc.EmbedSQLException.<init>(Unknown Source)
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
> at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
> at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown
> Source)
> at org.apache.derby.jdbc.Driver30.newEmbedPreparedStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
> Source)
> at
> org.apache.derbyTesting.functionTests.tests.lang.GeneratedColumnsHelper.chattyPrepare(GeneratedColumnsHelper.java:147)
> at
> org.apache.derbyTesting.functionTests.tests.lang.GeneratedColumnsHelper.goodStatement(GeneratedColumnsHelper.java:125)
> at
> org.apache.derbyTesting.functionTests.tests.lang.GeneratedColumnsTest.test_005_basicInsert(GeneratedColumnsTest.java:427)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at
> org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:105)
> at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
> at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
> at junit.extensions.TestSetup.run(TestSetup.java:23)
> at
> org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
> at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
> at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
> at junit.extensions.TestSetup.run(TestSetup.java:23)
> Caused by: java.sql.SQLException: Java exception:
> 'org/apache/derby/exe/acd83d18d1x0120x62bdx2dffxffffb19003081 0000 0000 :
> java.lang.VerifyError'.
> at java.lang.Throwable.<init>(Throwable.java:196)
> at java.lang.Exception.<init>(Exception.java:41)
> at java.sql.SQLException.<init>(SQLException.java:40)
> at org.apache.derby.impl.jdbc.EmbedSQLException.<init>(Unknown Source)
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
> at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
> at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown
> Source)
> ... 43 more
> Caused by: java.lang.VerifyError:
> org/apache/derby/exe/acd83d18d1x0120x62bdx2dffxffffb19003081 0000 0000
> at java.lang.Throwable.<init>(Throwable.java:196)
> at java.lang.Error.<init>(Error.java:49)
> at java.lang.VerifyError.<init>(VerifyError.java:34)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
> at
> org.apache.derby.iapi.services.loader.ClassInfo.getNewInstance(Unknown Source)
> at
> org.apache.derby.impl.services.reflect.LoadedGeneratedClass.newInstance(Unknown
> Source)
> at
> org.apache.derby.impl.services.reflect.ReflectGeneratedClass.newInstance(Unknown
> Source)
> at org.apache.derby.impl.sql.GenericActivationHolder.<init>(Unknown
> Source)
> at
> org.apache.derby.impl.sql.GenericPreparedStatement.getActivation(Unknown
> Source)
> ... 39 more
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