Comments (10)
jbachorik
commented on July 4, 2024
[author="j.bachorik", created="Tue, 15 Mar 2011 13:40:35 +0100"]
For the subtype matching to work correctly it is necessary to process a class only after all its superclasses and interfaces has been loaded.
In order to achieve this the class initializers of all newly loaded classes will be modified (or created if they don't exist) such that the class retransform on the current class will be triggered the moment the class initializer is executed. This will ensure the whole class hierarchy is loaded and the subtype matching will work correctly.
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jbachorik
commented on July 4, 2024
[author="j.bachorik", created="Tue, 15 Mar 2011 13:43:52 +0100"]
Fix delivered in http://kenai.com/projects/btrace/sources/core-maven/revision/12
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jbachorik
commented on July 4, 2024
[author="joachimhskeie", created="Tue, 15 Mar 2011 18:33:46 +0100"]
Hello,
I keep getting the following error:
xception in thread "main" java.lang.VerifyError: (class: org/apache/derby/jdbc/EmbeddedDriver, method: signature: ()V) Illegal type in constant pool at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at org.eurekaj.demo.derby.DerbyEnvironment.initializeDatabase(DerbyEnvironment.java:35) at org.eurekaj.demo.app.Main.startExecuting(Main.java:61) at org.eurekaj.demo.app.Main.(Main.java:37) at org.eurekaj.demo.app.Main.main(Main.java:107)
The method being executed is contains the following:
public void initializeDatabase() { try { Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance(); connection = DriverManager.getConnection(derbyProtocol + "EurekaJDemoDB;create=true", new Properties()); createDatabaseIfNotCreated(); } catch (InstantiationException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } catch (IllegalAccessException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } catch (ClassNotFoundException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } catch (SQLException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } }
The full source for the code being executed is here: https://github.com/joachimhs/EurekaJDemoApplication
It is being started with the following JAVA_OPTS from within IDEA: -Xmx256m -Dbtrace.agent=EurekaJDemoAgent -javaagent:/srv/btrace/1.3/btrace-agent-1.3-SNAPSHOT-agent.jar=scriptdir=/srv/btrace/1.3/scripts,stdout=false,fileRollMilliseconds=7500
The BTrace script being executed: https://github.com/joachimhs/EurekaJDemoApplication/blob/master/src/main/resources/JdbcQueries.java
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jbachorik
commented on July 4, 2024
[author="j.bachorik", created="Wed, 16 Mar 2011 15:11:35 +0100"]
This error was caused by loading a type operand on stack in the injected routine. Unfortunately, this requires the class version >= 49.
Fix available in http://kenai.com/projects/btrace/sources/core-maven/revision/13
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jbachorik
commented on July 4, 2024
[author="joachimhskeie", created="Thu, 17 Mar 2011 22:56:19 +0100"]
Trying out revision 13 above, I get a different stack trace than before, although similar:
java.sql.SQLException: Cannot create an instance of generated class org.apache.derby.exe.ac582f8014x012exc5cfx1c12x0000046737000.
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.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.(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.(Unknown Source)
at org.apache.derby.jdbc.Driver40.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.eurekaj.demo.task.NumStatisticsTask.readRowCountFromStatisticsTable(NumStatisticsTask.java:31)
at org.eurekaj.demo.task.NumStatisticsTask.run(NumStatisticsTask.java:45)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.sql.SQLException: Cannot create an instance of generated class org.apache.derby.exe.ac582f8014x012exc5cfx1c12x0000046737000.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
... 25 more
Caused by: java.sql.SQLException: Java exception: '(class: org/apache/derby/exe/ac582f8014x012exc5cfx1c12x0000046737000, method: signature: ()V) Illegal type in constant pool: java.lang.VerifyError'.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.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)
... 22 more
Caused by: java.lang.VerifyError: (class: org/apache/derby/exe/ac582f8014x012exc5cfx1c12x0000046737000, method: signature: ()V) Illegal type in constant pool
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructor0(Class.java:2699)
at java.lang.Class.getConstructor(Class.java:1657)
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.(Unknown Source)
at org.apache.derby.impl.sql.GenericPreparedStatement.getActivation(Unknown Source)
... 18 more
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jbachorik
commented on July 4, 2024
[author="j.bachorik", created="Fri, 18 Mar 2011 08:59:19 +0100"]
Rather counterintuitively, the major class version is encoded in the lower word of the version integer number. Thanks to this the plain comparison version < Opcodes.V1_5 doesn't work if a minor version is specified. It is necessary to extract the major version first and use that for the comparison.
I've checked with your demo application and after this change it works fine.
Implemented in - http://kenai.com/projects/btrace/sources/core-maven/revision/14.
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jbachorik
commented on July 4, 2024
[author="joachimhskeie", created="Fri, 18 Mar 2011 10:24:48 +0100"]
This is now working great, thanks!
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jbachorik
commented on July 4, 2024
[author="j.bachorik", created="Fri, 18 Mar 2011 10:55:01 +0100"]
Marking as closed
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jbachorik
commented on July 4, 2024
[author="j.bachorik", created="Sat, 18 Jun 2011 13:47:27 +0200"]
fix transplanted to the main (non-maven) repository - http://kenai.com/projects/btrace/sources/hg/revision/419
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jbachorik
commented on July 4, 2024
[author="j.bachorik", created="Tue, 26 Jun 2012 13:42:55 +0200"]
temporarily reopening; the issue target release has been changed to 1.2.2
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