RE: [Hibernate] Complex class loaders hierarchy
Title: [Hibernate] Complex class loaders hierarchy cant see your attachement (at netcafe ,), but im quite sure this is not the right solution to this *eclipse* problem ,) And I cant recall having this issue when installing own classloader. you should go to eclipse and look for the bug talking about buddy classloading which can handle this via eclipse classloader madness. max From: [EMAIL PROTECTED] on behalf of Ivan S. DubrovSent: Tue 14-06-2005 17:00To: hibernate-devel@lists.sourceforge.netSubject: [Hibernate] Complex class loaders hierarchy Hello,I've trying to use Hibernate in the environment with complex classloaders hierarchy (Eclipse plugin). During my experiments I've found the following problem. In order to proxy generation (via cglib) to work it is required that HibernateProxy is visible from the classloader that loads mine entities (since CGLib Enhancer by default uses superclass classloader).But in mine environment this is not true, since I do not want to make plugin with entities to depend on the plugin with Hibernate jar (so hibernate classes are not visible from the classloader that loads entities).To make Hibernate see my entities I set my own thread context classloader that "sees" both Hibernate jars and enities. So what I want is to make Enhancer use this classloader when generating proxy too.I propose the following modification to the CGLIBLazyInitializer:First, try generate proxy with default classloaders (superclass classloader). If it fails, try to generate proxy with Enhancer classloader set to the current thread context classloader. I think, this will be consistent with current implementation, since it already uses thread context classloader to load entities (so why not to use this classloader for proxy generation too?).I've attached a simple patch for this issue that shows the idea.
Fw: RE: [Hibernate] Complex class loaders hierarchy
cant see your attachement (at netcafe ,), but im quite sure this is not the right solution to this *eclipse* problem ,) And I cant recall having this issue when installing own classloader. you should go to eclipse and look for the bug talking about buddy classloading which can handle this via eclipse classloader madness. max No. This is not bug. I understand all Eclipse classloaders madness. This is feature :) I'll try to describe it again. I do not want make my entity classes see hibernate jar's (because I want to support pluggable persistence layers, for example via Hibernate or via JDBC, etc). Saying it another way, classloader of mine entity classes do not see hibernate classes - I just _want_ it to be this way. But when Hibernate generates proxy factory, it uses default Enhancer create method, look at the snippet: return (Factory) Enhancer.create( (interfaces.length==1) ? persistentClass : null, interfaces, NULL_METHOD_INTERCEPTOR ); If you look into the Enhancer source code, you'll see that if classloader was not set explicitly it uses superclass (the class that will be used as superclass for generated proxy) classloader. And the superclass in this case is mine entity class. So CGLib tries to generate proxy using my entity classloader. But interfaces array contains HibernateProxy interface, and this is class from Hibernate jar, so it is not seen from my entity classloader (this is by desire). So CGLib fails to generate proxy (with an exception of ClassNotFoundException). That's the problem. I've solved it very simple - in case of CodeGenerationException thrown from the Enhancer.create(), I call Enhancer again, but with classloader explicitly set to the Thread.currentThread().getContextClassLoader(). I think this is OK, since ReflectHelper already uses thread context classloader to load entities (that's why my entity is loaded by the Hibernate successfully, despite the fact that it is in the different classloader than Hibernate itself). I think the current behaviour of Hibernate is inconsistent - it can load entity classes from unrelated classloader (using the thread context classloader), but it fails to generate proxies for them (since it requires classloader of entity classes to see HibernateProxy class). The better way, of course, will be the ability to pass Hibernate classloader that will be used both for loading entity and generating proxy for it. --- This SF.Net email is sponsored by: NEC IT Guy Games. How far can you shotput a projector? How fast can you ride your desk chair down the office luge track? If you want to score the big prize, get to know the little guy. Play to win an NEC 61 plasma display: http://www.necitguy.com/?r=20 ___ hibernate-devel mailing list hibernate-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hibernate-devel
[Hibernate] Websphere 5.1 and Oracle 9x XA
Hi, We are using hibernate to develop our application. Everything seems to work fine when I run it on WebSphere and SQLServer. But I'm getting the following exception when using the oracle datasource. [6/14/05 11:17:56:417 PDT] 37074a26 MCWrapper E J2CA0081E: Method cleanup failed while trying to execute method cleanup on ManagedConnection [EMAIL PROTECTED] from resource PostXDB. Caught exception: com.ibm.ws.exception.WsException: DSRA0080E: An exception was received by the Data Store Adapter. See original exception message: Cannot call 'cleanup' on a ManagedConnection while it is still in a transaction.. at com.ibm.ws.rsadapter.exceptions.DataStoreAdapterException.init(DataStoreAdapterException.java:217) at com.ibm.ws.rsadapter.exceptions.DataStoreAdapterException.init(DataStoreAdapterException.java:171) at com.ibm.ws.rsadapter.AdapterUtil.createDataStoreAdapterException(AdapterUtil.java:209) at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.cleanupTransactions(WSRdbManagedConnectionImpl.java:2613) at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.cleanup(WSRdbManagedConnectionImpl.java:2320) at com.ibm.ejs.j2c.MCWrapper.cleanup(MCWrapper.java:1169) at com.ibm.ejs.j2c.poolmanager.FreePool.returnToFreePool(FreePool.java:326) at com.ibm.ejs.j2c.poolmanager.PoolManager.release(PoolManager.java:1275) at com.ibm.ejs.j2c.MCWrapper.releaseToPoolManager(MCWrapper.java:1678) at com.ibm.ejs.j2c.ConnectionEventListener.connectionClosed(ConnectionEventListener.java:217) at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.processConnectionClosedEvent(WSRdbManagedConnectionImpl.java:1042) at com.ibm.ws.rsadapter.jdbc.WSJdbcConnection.closeWrapper(WSJdbcConnection.java:561) at com.ibm.ws.rsadapter.jdbc.WSJdbcObject.close(WSJdbcObject.java:126) at com.postx.websphere.hibernate.WSDataSourceConnectionProvider.closeConnection(WSDataSourceConnectionProvider.java:104) at net.sf.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:103) at net.sf.hibernate.cfg.Configuration.buildSettings(Configuration.java:1160) at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:794) at net.sf.hibernate.jmx.HibernateService.buildSessionFactory(HibernateService.java:163) at net.sf.hibernate.jmx.HibernateService.start(HibernateService.java:130) at com.postx.hibernate.PxHibernateService.start(PxHibernateService.java:142) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60) at java.lang.reflect.Method.invoke(Method.java:391) at com.tivoli.jmx.DynamicMBeanSupport.invokeMethod(DynamicMBeanSupport.java:242) at com.tivoli.jmx.DynamicMBeanSupport.invoke(DynamicMBeanSupport.java:166) at com.tivoli.jmx.GenericMBeanSupport.invoke(GenericMBeanSupport.java:178) at com.tivoli.jmx.MBeanAccess.invoke(MBeanAccess.java:113) at com.tivoli.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:290) at com.postx.startup.ServiceLauncherThread.run(ServiceLauncherThread.java:269) Let me know if you have run into a similar problem. Thanks Shankar --- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_idt77alloc_id492op=click ___ hibernate-devel mailing list hibernate-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hibernate-devel
RE: [Hibernate] Websphere 5.1 and Oracle 9x XA
Please do NOT post things like this to the dev list! Thanks. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Shankar Srinivasan Sent: Tuesday, 14 June 2005 2:32 PM To: hibernate-devel@lists.sourceforge.net Subject: [Hibernate] Websphere 5.1 and Oracle 9x XA Hi, We are using hibernate to develop our application. Everything seems to work fine when I run it on WebSphere and SQLServer. But I'm getting the following exception when using the oracle datasource. [6/14/05 11:17:56:417 PDT] 37074a26 MCWrapper E J2CA0081E: Method cleanup failed while trying to execute method cleanup on ManagedConnection [EMAIL PROTECTED] from resource PostXDB. Caught exception: com.ibm.ws.exception.WsException: DSRA0080E: An exception was received by the Data Store Adapter. See original exception message: Cannot call 'cleanup' on a ManagedConnection while it is still in a transaction.. at com.ibm.ws.rsadapter.exceptions.DataStoreAdapterException.init(DataSto reAdapterException.java:217) at com.ibm.ws.rsadapter.exceptions.DataStoreAdapterException.init(DataSto reAdapterException.java:171) at com.ibm.ws.rsadapter.AdapterUtil.createDataStoreAdapterException(Adapter Util.java:209) at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.cleanupTransactions( WSRdbManagedConnectionImpl.java:2613) at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.cleanup(WSRdbManaged ConnectionImpl.java:2320) at com.ibm.ejs.j2c.MCWrapper.cleanup(MCWrapper.java:1169) at com.ibm.ejs.j2c.poolmanager.FreePool.returnToFreePool(FreePool.java:326) at com.ibm.ejs.j2c.poolmanager.PoolManager.release(PoolManager.java:1275) at com.ibm.ejs.j2c.MCWrapper.releaseToPoolManager(MCWrapper.java:1678) at com.ibm.ejs.j2c.ConnectionEventListener.connectionClosed(ConnectionEvent Listener.java:217) at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.processConnectionClo sedEvent(WSRdbManagedConnectionImpl.java:1042) at com.ibm.ws.rsadapter.jdbc.WSJdbcConnection.closeWrapper(WSJdbcConnection .java:561) at com.ibm.ws.rsadapter.jdbc.WSJdbcObject.close(WSJdbcObject.java:126) at com.postx.websphere.hibernate.WSDataSourceConnectionProvider.closeConnec tion(WSDataSourceConnectionProvider.java:104) at net.sf.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java: 103) at net.sf.hibernate.cfg.Configuration.buildSettings(Configuration.java:1160 ) at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.jav a:794) at net.sf.hibernate.jmx.HibernateService.buildSessionFactory(HibernateServi ce.java:163) at net.sf.hibernate.jmx.HibernateService.start(HibernateService.java:130) at com.postx.hibernate.PxHibernateService.start(PxHibernateService.java:142 ) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:85) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:58) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:60) at java.lang.reflect.Method.invoke(Method.java:391) at com.tivoli.jmx.DynamicMBeanSupport.invokeMethod(DynamicMBeanSupport.java :242) at com.tivoli.jmx.DynamicMBeanSupport.invoke(DynamicMBeanSupport.java:166) at com.tivoli.jmx.GenericMBeanSupport.invoke(GenericMBeanSupport.java:178) at com.tivoli.jmx.MBeanAccess.invoke(MBeanAccess.java:113) at com.tivoli.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:290) at com.postx.startup.ServiceLauncherThread.run(ServiceLauncherThread.java:2 69) Let me know if you have run into a similar problem. Thanks Shankar --- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_idt77alloc_id492op=ick ___ hibernate-devel mailing list hibernate-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hibernate-devel --- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_idt77alloc_id492op=click ___ hibernate-devel mailing list hibernate-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hibernate-devel
[Hibernate] Wanted: Documentation maintainer
The Hibernate team is looking for a new member to help with the documentation process. This is mostly a maintenance and coordination job. Responsibilities include: - Organization of the Wiki Community Area on the hibernate.org website - Coordination of the translator team (15 writers from all over the world) - Working on the DocBook documentation build process - Helping developers to write consistent docs - Proof-reading and correction of English (master) documentation This is good opportunity if you want to get more familiar with Hibernate and if you plan to study the documentation in detail. However, English should be your native language. If you are interested in joining a successful open source project, drop me an email. --- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477alloc_id=16492op=click ___ hibernate-devel mailing list hibernate-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hibernate-devel
