Hi,
Olaf Geibig wrote:
> Some addidtions to my old email.
>
> First of all I wonder that there was no response to my email - I thought
> that probably more people need the C/S mode.
sorry for the late answer, i've been travelling...
> Now I ran OJB's junit tests on a freshly unpacked and compiled OJB in
> C/S mode and they also fail because of similar exceptions. So I think if
> the junit tests fail the C/S mode must be really *not* working right
> now.
mhh, I don't remember exactly if it was for the OJB 0.9.4 or 0.9.5
release. But at at least for one of them I ran the complete regression
test suite successfully.
Maybe I did not check 0.9.5 properly (it really takes a long time to run
all tests in C/S mode)
> When I ran the junit tests with the client and server on two
> different machines there were even more failures. So there is my question:
>
> Is there anybody who is using the C/S mode successfully?
>
> I find the C/S mode very buggy, the not existent getPBKey(), etc, etc. .
please try out the 0.9.4 release. The bugs you found seem to be simple
regression bugs that are easy to fix.
I'll try to repair c/s for the next release.
> Probably the developers are more concentrating on other features.
I think I'm the only one working on C/s from time to time...
Most users are happy with the singlevm solution.
> For me
> the feature is quite important. So, that means I have write my own
> little server or I try to work on the OJB server.... How to become a
> contributor?
becoming a contributor is *very* easy:
just post your bug fix, new feature, etc. to the mailing list. the
committers will review your contribution and check it in.
cheers,
Thomas
> /olaf
>
>
> Olaf Geibig wrote:
>
>> Hello
>>
>> I'm getting more and more desperate about OJB's behaviour in C/S mode.
>> I cannot make it work for me in a stable way. Probably it's a
>> communication problem, but I'm running server and client on the same
>> machine on localhost. Client and server are sharing also the
>> OJB.properties file.
>>
>> OJB-0.9.5, jdk 1.3.1, server mode, ODMG interface, HSQLDB server mode.
>>
>> I run the same test code over and over again always an a freshly setup
>> empty database and a freshly started OJB-server and I'm getting lots
>> of different exceptions in every run - I mean different test runs
>> result in diffrent exceptions then in the previous test runs. Moreover
>> in singleVM mode everything is working fine. The exceptions are coming
>> up in C/S mode *only*.
>>
>> For sure the execptions are thrown when I try to update objects in a
>> n:m relation, sometimes but quite rare they also come up when storing
>> the other objects with 1:n relations.
>>
>> Here is my code for the creation / update of m:n objects. Semester and
>> CourseGroup have a m:n relation with no role.
>>
>> cg = new CourseGroup();
>> cg.setName("Methodisch/Technologisch orientierter Schwerpunkt");
>> cg.setHours(8);
>> cg.setCollSemester(new Vector());
>> s = (Semester)tool.querySelectFirst(odmg, Semester.class,
>> "number=7");
>> cg.getCollSemester().add(s);
>> s = (Semester)tool.querySelectFirst(odmg, Semester.class,
>> "number=6");
>> cg.getCollSemester().add(s);
>> cg.setCollCourse(new Vector());
>> Transaction tx = odmg.newTransaction();
>> tx.begin();
>> db.makePersistent(cg);
>> tx.commit();
>>
>> s = (Semester)tool.querySelectFirst(odmg, Semester.class,
>> "number=6");
>> cg = new CourseGroup();
>> cg.setName("Aktuelle Tendenzen der WI");
>> cg.setHours(4);
>> cg.setCollSemester(new Vector());
>> cg.getCollSemester().add(s);
>> cg.setCollCourse(new Vector());
>> Transaction tx2 = odmg.newTransaction();
>> tx2.begin();
>> db.makePersistent(cg);
>> tx2.commit();
>>
>> I attached three different exceptions resulting from three different
>> test runs with identical conditions. But for sure there is a
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>>
>> ------------------------------------------------------------------------
>>
>> [BOOT] INFO: OJB.properties: file:/C:/Documents and Settings/Olaf/My
>> Documents/Devel/projects/stundenplan/run/server/OJB.properties
>> (util.DatabaseCreator 148 ) Opening database timetable...
>> (util.DatabaseCreator 148 ) creating Room...
>> (DEFAULT 264 ) OJB Descriptor Repository:
>> file:/C:/Documents and Settings/Olaf/My
>> Documents/Devel/projects/stundenplan/run/server/repository.xml
>> (DEFAULT 289 ) ...Finished parsing
>> (util.DatabaseCreator 148 ) creating Season...
>> (util.DatabaseCreator 148 ) creating Study...
>> (util.DatabaseCreator 148 ) creating Curriculum...
>> (util.DatabaseCreator 148 ) creating Semester...
>> (util.DatabaseCreator 148 ) creating CourseGroup...
>> (odmg.TransactionImpl 253 ) Locking obj
>> og.timetable.persistent.Curriculum@5337d3 with lock mode 4 failed
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:257)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:147)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.close(PersistenceBrokerClient.java:793)
>
>>
>> at org.apache.ojb.broker.Identity.<init>(Identity.java:206)
>> at
>>
>org.apache.ojb.odmg.locking.PersistentLockMapImpl.getWriter(PersistentLockMapImpl.java:134)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.AbstractLockStrategy.getWriter(AbstractLockStrategy.java:98)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.ReadUncommittedStrategy.writeLock(ReadUncommittedStrategy.java:100)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.ReadUncommittedStrategy.writeLock(ReadUncommittedStrategy.java:106)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.LockManagerDefaultImpl.writeLock(LockManagerDefaultImpl.java:119)
>
>>
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:234)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockReferences(TransactionImpl.java:821)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:630)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockReferences(TransactionImpl.java:821)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:630)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:257)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:147)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.close(PersistenceBrokerClient.java:793)
>
>>
>> at org.apache.ojb.broker.Identity.<init>(Identity.java:206)
>> at
>>
>org.apache.ojb.odmg.locking.PersistentLockMapImpl.getWriter(PersistentLockMapImpl.java:134)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.AbstractLockStrategy.getWriter(AbstractLockStrategy.java:98)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.ReadUncommittedStrategy.writeLock(ReadUncommittedStrategy.java:100)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.ReadUncommittedStrategy.writeLock(ReadUncommittedStrategy.java:106)
>
>>
>> at
>>
>org.apache.ojb.odmg.locking.LockManagerDefaultImpl.writeLock(LockManagerDefaultImpl.java:119)
>
>>
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:234)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockReferences(TransactionImpl.java:821)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:630)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockReferences(TransactionImpl.java:821)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:630)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> Error while communicating with OJB server
>> (DEFAULT 199 )
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> (DEFAULT 199 )
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> (odmg.TransactionImpl 253 ) Locking obj
>> og.timetable.persistent.Semester@7050f5 with lock mode 4 failed
>> org.apache.ojb.broker.metadata.ClassNotPersistenceCapableException:
>> Error while communicating with OJB server
>> at org.apache.ojb.broker.Identity.<init>(Identity.java:200)
>> at
>>
>org.apache.ojb.odmg.locking.LockManagerDefaultImpl.releaseLock(LockManagerDefaultImpl.java:140)
>
>>
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:252)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockReferences(TransactionImpl.java:821)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:630)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> org.apache.ojb.broker.metadata.ClassNotPersistenceCapableException:
>> Error while communicating with OJB server
>> at org.apache.ojb.broker.Identity.<init>(Identity.java:200)
>> at
>>
>org.apache.ojb.odmg.locking.LockManagerDefaultImpl.releaseLock(LockManagerDefaultImpl.java:140)
>
>>
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:252)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockReferences(TransactionImpl.java:821)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:630)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> Error while communicating with OJB server
>> (odmg.TransactionImpl 253 ) Locking obj
>> og.timetable.persistent.CourseGroup@46df77 with lock mode 4 failed
>> org.odmg.LockNotGrantedException: Error while communicating with OJB
>> server
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:256)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> org.odmg.LockNotGrantedException: Error while communicating with OJB
>> server
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:256)
>> at
>> org.apache.ojb.odmg.TransactionImpl.lockCollections(TransactionImpl.java:782)
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.register(TransactionImpl.java:636)
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:248)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> Error while communicating with OJB server
>> (util.OJBTool 172 ) Lock not granted on object
>> og.timetable.persistent.CourseGroup@46df77
>> org.odmg.LockNotGrantedException: Error while communicating with OJB
>> server
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:256)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> (odmg.TransactionImpl 496 ) Abort transaction was
>> called on tx org.apache.ojb.odmg.TransactionImpl@144823, associated PB
>> was org.apache.ojb.broker.server.PersistenceBrokerClient@c02cc
>> (DEFAULT 199 )
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> (odmg.OJB 150 )
>> org.apache.ojb.broker.metadata.ClassNotPersistenceCapableException:
>> Error while communicating with OJB server
>> (util.DatabaseCreator 204 ) DatabaseCreator.setupDB()
>> error:
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:257)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:147)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.abortTransaction(PersistenceBrokerClient.java:340)
>
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.abort(TransactionImpl.java:505)
>> at og.timetable.util.OJBTool.store(OJBTool.java:157)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>>
>> ------------------------------------------------------------------------
>>
>> [BOOT] INFO: OJB.properties: file:/C:/Documents and Settings/Olaf/My
>> Documents/Devel/projects/stundenplan/run/server/OJB.properties
>> (util.DatabaseCreator 148 ) Opening database timetable...
>> (util.DatabaseCreator 148 ) creating Room...
>> (DEFAULT 264 ) OJB Descriptor Repository:
>> file:/C:/Documents and Settings/Olaf/My
>> Documents/Devel/projects/stundenplan/run/server/repository.xml
>> (DEFAULT 289 ) ...Finished parsing
>> (util.DatabaseCreator 148 ) creating Season...
>> (util.DatabaseCreator 148 ) creating Study...
>> (util.DatabaseCreator 148 ) creating Curriculum...
>> (util.DatabaseCreator 148 ) creating Semester...
>> (util.DatabaseCreator 148 ) creating CourseGroup...
>> (DEFAULT 199 )
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> (util.DatabaseCreator 204 ) DatabaseCreator.setupDB()
>> error:
>> org.apache.ojb.broker.metadata.ClassNotPersistenceCapableException:
>> Error while communicating with OJB server
>> at org.apache.ojb.broker.Identity.<init>(Identity.java:200)
>> at
>>
>org.apache.ojb.odmg.locking.LockManagerDefaultImpl.releaseLock(LockManagerDefaultImpl.java:140)
>
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.removeLock(TransactionImpl.java:439)
>> at
>> org.apache.ojb.odmg.TransactionImpl.doClose(TransactionImpl.java:339)
>> at
>> org.apache.ojb.odmg.TransactionImpl.commit(TransactionImpl.java:472)
>> at og.timetable.util.OJBTool.querySelectFirst(OJBTool.java:111)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:165)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>>
>>
>> 178 instances
>>
>> ------------------------------------------------------------------------
>>
>> [BOOT] INFO: OJB.properties: file:/C:/Documents and Settings/Olaf/My
>> Documents/Devel/projects/stundenplan/run/server/OJB.properties
>> (util.DatabaseCreator 148 ) Opening database timetable...
>> (util.DatabaseCreator 148 ) creating Room...
>> (DEFAULT 264 ) OJB Descriptor Repository:
>> file:/C:/Documents and Settings/Olaf/My
>> Documents/Devel/projects/stundenplan/run/server/repository.xml
>> (DEFAULT 289 ) ...Finished parsing
>> (util.DatabaseCreator 148 ) creating Season...
>> (util.DatabaseCreator 148 ) creating Study...
>> (util.DatabaseCreator 148 ) creating Curriculum...
>> (util.DatabaseCreator 148 ) creating Semester...
>> (util.DatabaseCreator 148 ) creating CourseGroup...
>> (DEFAULT 199 )
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> (DEFAULT 199 )
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> (DEFAULT 199 )
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> (util.OJBTool 172 ) Transaction aborted on
>> object og.timetable.persistent.CourseGroup@68afdd
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:257)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:147)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.close(PersistenceBrokerClient.java:793)
>
>>
>> at org.apache.ojb.broker.Identity.<init>(Identity.java:206)
>> at
>>
>org.apache.ojb.odmg.locking.LockManagerDefaultImpl.releaseLock(LockManagerDefaultImpl.java:140)
>
>>
>> at org.apache.ojb.odmg.TransactionImpl.lock(TransactionImpl.java:252)
>> at og.timetable.util.OJBTool.store(OJBTool.java:153)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:168)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>> (util.DatabaseCreator 204 ) DatabaseCreator.setupDB()
>> error:
>> org.apache.ojb.broker.PersistenceBrokerException: Error while
>> communicating with OJB server
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:257)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.callServer(PersistenceBrokerClient.java:147)
>
>>
>> at
>>
>org.apache.ojb.broker.server.PersistenceBrokerClient.beginTransaction(PersistenceBrokerClient.java:359)
>
>>
>> at
>> org.apache.ojb.odmg.TransactionImpl.begin(TransactionImpl.java:535)
>> at og.timetable.util.OJBTool.querySelectFirst(OJBTool.java:87)
>> at
>> og.timetable.util.DatabaseCreator.createCourseGroup(DatabaseCreator.java:170)
>>
>> at
>> og.timetable.util.DatabaseCreator.setupDB(DatabaseCreator.java:131)
>> at og.timetable.util.TimetableTool.main(TimetableTool.java:46)
>>
>>
>> 216 instances
>>
>>
>> ------------------------------------------------------------------------
>>
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>>
>
>
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>
>
>
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