I tried again to make it work all the day along,
When I retrieve objects in Junit test cases, it doesn't give me any
error with most of cache implementations...
If anyone have any Idea, I am realy thinking this case is hopeless.....
Here is the full error stack :
java.lang.StackOverflowError
at java.lang.Integer.toString(Integer.java:296)
at java.lang.Integer.toString(Integer.java:109)
at java.lang.String.valueOf(String.java:2236)
at com.mysql.jdbc.PreparedStatement.setInt(PreparedStatement.java:558)
at
com.mysql.jdbc.PreparedStatement.setObject(PreparedStatement.java:772)
at
com.mysql.jdbc.PreparedStatement.setObject(PreparedStatement.java:944)
at
org.apache.ojb.broker.platforms.PlatformDefaultImpl.setObjectForStatement(PlatformDefaultImpl.java:249)
at
org.apache.ojb.broker.platforms.PlatformMySQLImpl.setObjectForStatement(PlatformMySQLImpl.java:87)
at
org.apache.ojb.broker.accesslayer.StatementManager.bindStatementValue(StatementManager.java:216)
at
org.apache.ojb.broker.accesslayer.StatementManager.bindStatement(StatementManager.java:248)
at
org.apache.ojb.broker.accesslayer.StatementManager.bindSelectionCriteria(StatementManager.java:424)
at
org.apache.ojb.broker.accesslayer.StatementManager.bindStatement(StatementManager.java:388)
at
org.apache.ojb.broker.accesslayer.StatementManager.bindStatement(StatementManager.java:361)
at
org.apache.ojb.broker.accesslayer.JdbcAccessImpl.executeQuery(JdbcAccessImpl.java:279)
at
org.apache.ojb.broker.accesslayer.RsQueryObject.performQuery(RsQueryObject.java:74)
at
org.apache.ojb.broker.accesslayer.RsIterator.<init>(RsIterator.java:183)
at
org.apache.ojb.broker.core.RsIteratorFactoryImpl.createRsIterator(RsIteratorFactoryImpl.java:58)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getRsIteratorFromQuery(PersistenceBrokerImpl.java:1808)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getIteratorFromQuery(PersistenceBrokerImpl.java:1333)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getIteratorByQuery(PersistenceBrokerImpl.java:1320)
at
org.apache.ojb.broker.accesslayer.BasePrefetcher.prefetchRelationship(BasePrefetcher.java:104)
at
org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(QueryReferenceBroker.java:329)
at
org.apache.ojb.broker.accesslayer.BasePrefetcher.prefetchRelationship(BasePrefetcher.java:113)
at
org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(QueryReferenceBroker.java:329)
at
org.apache.ojb.broker.accesslayer.BasePrefetcher.prefetchRelationship(BasePrefetcher.java:113)
at
org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(QueryReferenceBroker.java:329)
at
org.apache.ojb.broker.accesslayer.BasePrefetcher.prefetchRelationship(BasePrefetcher.java:113)
(and so on...)
On Wed, 26 Jan 2005 09:22:39 +0900, Sylvain ~ <[EMAIL PROTECTED]> wrote:
> I forgot to mention thaht I use OJB 1.0.1.
>
>
> On Tue, 25 Jan 2005 22:51:09 +0900, Sylvain ~ <[EMAIL PROTECTED]> wrote:
> > I think the problems comes from the cache implementation I use,
> > because It used to work quite well with jUnit tests and Default Cache
> > Implementation, and in this situation there is only One thread so
> > there wasn't any "dirty read" problem.
> >
> > However, since I moved the application in Struts Actions Under tomcat,
> > I couldn't use the default Cache Implementation since it is not
> > thread-safe, and I got some errors with retrieved data. So, I thought
> > that using a thread-safe cache implementation such as
> > "ObjectCachePerBrokerImpl" could solve the problem, and by doing so I
> > solved the problems that used to happen, until I tried Crossreferenced
> > Objects...
> >
> > I think that the source of the problem can be that I don't have any
> > global cache, because I retrieve first the Room Object and the nested
> > collection in a Struts Action (that might be running it it's own
> > thread), and then on the users collection elements I try to get
> > information on rooms, and it runs on a different thread from the first
> > Action since it located in a different Action.
> >
> > So, I think that using a global cache which is thread-safe could solve
> > this issue, however there is only few documentation on caches
> > implementations in the cache package.
> >
> > As I read in the javadoc, it seems that ObjectCachePerClassImpl is a
> > global cache, but i don't know if it thread-safe at all.
> >
> > I retrieve Objects using this code :
> >
> > public StorableObject get(Class objectClass, Integer pk) {
> > PersistenceBroker broker = null;
> > Object result;
> >
> > Criteria crit = new Criteria();
> > crit.addEqualTo("pk",pk);
> > crit = criteraModificator(objectClass, crit);
> >
> > try {
> > broker = PersistenceBrokerFactory.defaultPersistenceBroker();
> > QueryByCriteria query = new QueryByCriteria(objectClass, crit);
> > result = broker.getObjectByQuery(query);
> >
> > } finally {
> > if (broker != null)
> > broker.close();
> > }
> > return (StorableObject)result;
> > }
> >
> > Regards,
> > Sylvain.
> >
> > On Tue, 25 Jan 2005 11:23:02 +0100, Armin Waibel <[EMAIL PROTECTED]> wrote:
> > > Hi,
> > >
> > > which version of OJB do you use?
> > > Did you try the default ObjectCache implementation? Same result?
> > > How does your code look like?
> > >
> > > regards,
> > > Armin
> > >
> > > Sylvain ~ wrote:
> > > > Hi,
> > > >
> > > > I'm trying to create crossreferenced objects, as specified in the
> > > > Cache documentation :
> > > >
> > > > "It allows to perform circular lookups (as by crossreferenced
> > > > objects) that would result in non-terminating loops without such a
> > > > cache."
> > > >
> > > > I Use ObjectCachePerBrokerImpl since my application is multi-threaded
> > > > (and runs on tomcat)
> > > >
> > > > The problem is that I get a java.lang.StackOverflowError, when trying
> > > > to do so with theses classes (simplified for clarity). both classes
> > > > have auto-retrieve="true".
> > > >
> > > > Any Idea to make it work would be appreciated.
> > > > Sylvain.
> > > >
> > > > public class User {
> > > >
> > > > /**
> > > > * --- PK ---
> > > > * @ojb.field primarykey="true"
> > > > * autoincrement="ojb"
> > > > */
> > > > private Integer pk=null;
> > > >
> > > > /**
> > > > * user room
> > > > * @ojb.reference
> > > > * foreignkey="pk"
> > > > */
> > > > private Room room;
> > > >
> > > > }
> > > >
> > > > public class Room {
> > > >
> > > > /**
> > > > * --- PK ---
> > > > * @ojb.field primarykey="true"
> > > > * autoincrement="ojb"
> > > > */
> > > > private Integer pk=null;
> > > >
> > > > /**
> > > > * Students in this room
> > > > * @ojb.collection
> > > > * foreignkey="fk"
> > > > * element-class-ref="kdms.core.persistent.User"
> > > > * auto-update="true"
> > > > * auto-retrieve="true"
> > > > * auto-delete="false"
> > > > */
> > > > private Vector users;
> > > > }
> > > >
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> > > >
> > > >
> > > >
> > >
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> >
>
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