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robinbajaj

Post subject: Diff b/w java:/TransactionManager and java:/UserTransaction

Posted: Sat Aug 11, 2007 10:16 am

Newbie

Joined: Fri Aug 10, 2007 2:04 am
Posts: 7

My original post got obsolete after my latest findings , which is why i am posting a new question.

I am trying to use JTA programmatically using JTA's UserTransaction interface + Hibernate Core API. My Hibernate version is 3.2.4 SP1. Using JBoss 421GA Application Server.
Following the suggestion provided at
http://www.hibernate.org/42.html#A5
[[ I am also following Hibernate 3.2 persistence book , Chapter 10, Transactions & Concurrency, page 442
Programmatic Transactions with JTA]]

Main Question:
A.
The above article suggests to lookup java:/UserTransaction in the businessObject. I have seen another suggestion else where to register the

Code:

<property name="jta.UserTransaction">java:/UserTransaction</property>

in Hibernate.cfg.xml. So I did both. But when running my unit-test I get "could not locate TransactionManager" exception message.

My question is why is hibernate class org.hibernate.transaction.JBossTransactionManagerLookUp looking for java:/TransactionManager instead of
java:/UserTransaction which is what the Hibernate.cfg.xml and BusinessObject is suggested to be looked up.

If I figure this out, I think I can fix the "could not locate Transaction
Manager" exception

B. this post on jboss forum
http://www.jboss.com/?module=bb&op=viewtopic&t=35448
suggests to look up java:/UserTransaction when running outside of jboss VM

Quote:

it's not possible to get the TransactionManager outside the jboss VM (i.e. from the client VM). To manage a transaction from the client side use java:/UserTransaction instead.

In my case, I am running a standalone junit test on my businessObject before hooking it up into my
Struts based web-app. While running this unit-test (vs running struts web-app) when should i use java:/UserTransaction vs
java:/TransactionManager

Details on my findings and my code snippets/logs/exception/hibernate config file:

My BusinessObject is looking up the UserTransaction in its constructor as

Code:

   UserTransaction utx=null;
   Context ctx=null;
   public PatientManager() throws Exception{
      Configuration conf = new Configuration();
      conf.setProperties(getInitialContextProperties());
      
      utx= (UserTransaction) new InitialContext().lookup("java:/UserTransaction");
   }
   public static InitialContext getInitialContext() throws Exception {
      Hashtable props = getInitialContextProperties();
      return new InitialContext(props);
      }

      private static Properties getInitialContextProperties() {
      Properties props = new Properties();
      props.put("java.naming.factory.initial",
      "org.jnp.interfaces.NamingContextFactory");
      props.put("java.naming.factory.url.pkgs",
      "org.jboss.naming:org.jnp.interfaces");
      props.put("java.naming.provider.url","jnp://localhost:1099");
      return props;
   }

But when its businessMethod is called, which uses the classic (HibernateUtil ) singleton pattern to get the sessionFactory
as shown below...

Code:

   public Patient getNextPatient(Integer ptID) throws Exception {
      Patient tmpPatient = new Patient();
      Session session = null;
      Statement stmt = null;
      Patient patient = null;
      try {
         utx.begin();
         session = HibernateUtil.getSessionFactory().getCurrentSession();
.......
...
..

which calls the following HibernateUtil code (a very standard version borrowed from Hibernate 3.2 persistence book)

Code:

import org.hibernate.*;
import org.hibernate.cfg.*;

public class HibernateUtil {
   private static SessionFactory sessionFactory;
   static {
      try {
         sessionFactory = new Configuration().configure()
               .buildSessionFactory();
      } catch (Throwable ex) {
         throw new ExceptionInInitializerError(ex);
      }
   }

...........<getters and setters here>
....
..
}

I get an exception when .buildSessionFactory() function is called in the above mentioned static block...

The exception trace points out that this function
JNDITransactionManagerLookup.getTransactionManager()
"Could not locate TransactionManager"

I checked the Hibernate API code for this function call...
it looks like this

Code:

return (TransactionManager) NamingHelper.getInitialContext(props).lookup( getName() );

The getName() function is implemented by JBossTransactionManagerLookup class as following

Code:

protected String getName() {
      return "java:/TransactionManager";
   }

My question is why is hibernate looking for java:TransactionManager instead of
java:/UserTransaction which is what the Hibernate.cfg.xml and BusinessObject is suggested to lookup.

Code:

 
java.lang.ExceptionInInitializerError
   at com.bcdrg.library.HibernateUtil.<clinit>(HibernateUtil.java:13)
   at com.bcdrg.test.PatientTest.tearDown(PatientTest.java:118)
   at junit.framework.TestCase.runBare(TestCase.java:143)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:131)
   at junit.framework.TestSuite.runTest(TestSuite.java:173)
   at junit.framework.TestSuite.run(TestSuite.java:168)
   at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: org.hibernate.HibernateException: Could not locate TransactionManager
   at org.hibernate.transaction.JNDITransactionManagerLookup.getTransactionManager(JNDITransactionManagerLookup.java:29)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:325)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
   at com.bcdrg.library.HibernateUtil.<clinit>(HibernateUtil.java:11)
   ... 14 more
Caused by: javax.naming.NameNotFoundException: TransactionManager not bound
   at org.jnp.server.NamingServer.getBinding(NamingServer.java:529)
   at org.jnp.server.NamingServer.getBinding(NamingServer.java:537)
   at org.jnp.server.NamingServer.getObject(NamingServer.java:543)
   at org.jnp.server.NamingServer.lookup(NamingServer.java:296)
   at sun.reflect.GeneratedMethodAccessor120.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:585)
   at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
   at sun.rmi.transport.Transport$1.run(Transport.java:153)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
   at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
   at java.lang.Thread.run(Thread.java:595)
   at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
   at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
   at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
   at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
   at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:627)
   at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:589)
   at javax.naming.InitialContext.lookup(InitialContext.java:351)
   at org.hibernate.transaction.JNDITransactionManagerLookup.getTransactionManager(JNDITransactionManagerLookup.java:26)
   ... 17 more

Debug level Hibernate log excerpt:

Code:

log4j:ERROR Could not find value for key log4j.appender.SQL_APPENDER
log4j:ERROR Could not instantiate appender named "SQL_APPENDER".
46:21,625 INFO PatientTest:66 - @@@printNextPatient(int ptID)-started
46:21,687 INFO Environment:514 - Hibernate 3.2.4.sp1
46:21,687 INFO Environment:547 - hibernate.properties not found
46:21,687 INFO Environment:681 - Bytecode provider name : cglib
46:21,703 INFO Environment:598 - using JDK 1.4 java.sql.Timestamp handling
46:22,187 INFO Configuration:1426 - configuring from resource: /hibernate.cfg.xml
46:22,187 INFO Configuration:1403 - Configuration resource: /hibernate.cfg.xml
46:22,328 INFO Configuration:553 - Reading mappings from resource : hello/Message.hbm.xml
46:22,437 INFO HbmBinder:300 - Mapping class: hello.Message -> MESSAGES
46:22,515 INFO Configuration:553 - Reading mappings from resource : com/bcdrg/library/Tbldemographics.hbm.xml
46:22,546 INFO HbmBinder:300 - Mapping class: com.bcdrg.library.Patient -> tbldemographics
46:22,546 INFO Configuration:1541 - Configured SessionFactory: null
46:22,562 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}
46:22,578 INFO DatasourceConnectionProvider:61 - Using datasource: postgresDS
46:22,718 INFO SettingsFactory:89 - RDBMS: PostgreSQL, version: 8.1.4
46:22,734 INFO SettingsFactory:90 - JDBC driver: PostgreSQL Native Driver, version: PostgreSQL 8.1 JDBC2 with NO SSL (build 405)
46:22,781 INFO Dialect:152 - Using dialect: org.hibernate.dialect.PostgreSQLDialect
46:22,796 INFO TransactionFactoryFactory:34 - Transaction strategy: org.hibernate.transaction.JTATransactionFactory
46:22,796 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}
46:22,796 INFO TransactionManagerLookupFactory:38 - instantiating TransactionManagerLookup: org.hibernate.transaction.JBossTransactionManagerLookup
46:22,796 INFO TransactionManagerLookupFactory:42 - instantiated TransactionManagerLookup
46:22,796 INFO SettingsFactory:143 - Automatic flush during beforeCompletion(): disabled
46:22,796 INFO SettingsFactory:147 - Automatic session close at end of transaction: disabled
46:22,796 INFO SettingsFactory:154 - JDBC batch size: 15
46:22,796 INFO SettingsFactory:157 - JDBC batch updates for versioned data: disabled
46:22,796 INFO SettingsFactory:162 - Scrollable result sets: enabled
46:22,796 INFO SettingsFactory:170 - JDBC3 getGeneratedKeys(): disabled
46:22,796 INFO SettingsFactory:178 - Connection release mode: auto
46:22,796 INFO SettingsFactory:205 - Default batch fetch size: 1
46:22,796 INFO SettingsFactory:209 - Generate SQL with comments: disabled
46:22,812 INFO SettingsFactory:213 - Order SQL updates by primary key: disabled
46:22,812 INFO SettingsFactory:217 - Order SQL inserts for batching: disabled
46:22,812 INFO SettingsFactory:386 - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
46:22,812 INFO ASTQueryTranslatorFactory:24 - Using ASTQueryTranslatorFactory
46:22,812 INFO SettingsFactory:225 - Query language substitutions: {}
46:22,812 INFO SettingsFactory:230 - JPA-QL strict compliance: disabled
46:22,812 INFO SettingsFactory:235 - Second-level cache: enabled
46:22,812 INFO SettingsFactory:239 - Query cache: disabled
46:22,812 INFO SettingsFactory:373 - Cache provider: org.hibernate.cache.NoCacheProvider
46:22,812 INFO SettingsFactory:254 - Optimize cache for minimal puts: disabled
46:22,812 INFO SettingsFactory:263 - Structured second-level cache entries: disabled
46:22,828 INFO SettingsFactory:283 - Echoing all SQL to stdout
46:22,828 INFO SettingsFactory:290 - Statistics: disabled
46:22,828 INFO SettingsFactory:294 - Deleted entity synthetic identifier rollback: disabled
46:22,828 INFO SettingsFactory:309 - Default entity-mode: pojo
46:22,828 INFO SettingsFactory:313 - Named query checking : enabled
46:22,859 INFO SessionFactoryImpl:161 - building session factory
46:23,140 INFO SessionFactoryObjectFactory:86 - Factory name: java:hibernate/SessionFactory
46:23,140 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}
46:23,156 INFO SessionFactoryObjectFactory:91 - Bound factory to JNDI name: java:hibernate/SessionFactory
46:23,156 WARN SessionFactoryObjectFactory:101 - InitialContext did not implement EventContext
46:23,156 INFO NamingHelper:25 - @@@Robin : getName()java:/TransactionManager
46:23,156 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}
46:23,171 INFO PatientTest:117 - @@@tearDown()-started
46:23,171 INFO Configuration:1426 - configuring from resource: /hibernate.cfg.xml
46:23,171 INFO Configuration:1403 - Configuration resource: /hibernate.cfg.xml
46:23,171 INFO Configuration:553 - Reading mappings from resource : hello/Message.hbm.xml
46:23,203 INFO HbmBinder:300 - Mapping class: hello.Message -> MESSAGES
46:23,203 INFO Configuration:553 - Reading mappings from resource : com/bcdrg/library/Tbldemographics.hbm.xml
46:23,218 INFO HbmBinder:300 - Mapping class: com.bcdrg.library.Patient -> tbldemographics
46:23,218 INFO Configuration:1541 - Configured SessionFactory: null
46:23,218 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}
46:23,234 INFO DatasourceConnectionProvider:61 - Using datasource: postgresDS
46:23,281 INFO SettingsFactory:89 - RDBMS: PostgreSQL, version: 8.1.4
46:23,296 INFO SettingsFactory:90 - JDBC driver: PostgreSQL Native Driver, version: PostgreSQL 8.1 JDBC2 with NO SSL (build 405)
46:23,312 INFO Dialect:152 - Using dialect: org.hibernate.dialect.PostgreSQLDialect
46:23,312 INFO TransactionFactoryFactory:34 - Transaction strategy: org.hibernate.transaction.JTATransactionFactory
46:23,312 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}
46:23,312 INFO TransactionManagerLookupFactory:38 - instantiating TransactionManagerLookup: org.hibernate.transaction.JBossTransactionManagerLookup
46:23,312 INFO TransactionManagerLookupFactory:42 - instantiated TransactionManagerLookup
46:23,312 INFO SettingsFactory:143 - Automatic flush during beforeCompletion(): disabled
46:23,312 INFO SettingsFactory:147 - Automatic session close at end of transaction: disabled
46:23,312 INFO SettingsFactory:154 - JDBC batch size: 15
46:23,312 INFO SettingsFactory:157 - JDBC batch updates for versioned data: disabled
46:23,312 INFO SettingsFactory:162 - Scrollable result sets: enabled
46:23,312 INFO SettingsFactory:170 - JDBC3 getGeneratedKeys(): disabled
46:23,312 INFO SettingsFactory:178 - Connection release mode: auto
46:23,312 INFO SettingsFactory:205 - Default batch fetch size: 1
46:23,312 INFO SettingsFactory:209 - Generate SQL with comments: disabled
46:23,312 INFO SettingsFactory:213 - Order SQL updates by primary key: disabled
46:23,312 INFO SettingsFactory:217 - Order SQL inserts for batching: disabled
46:23,312 INFO SettingsFactory:386 - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
46:23,312 INFO ASTQueryTranslatorFactory:24 - Using ASTQueryTranslatorFactory
46:23,312 INFO SettingsFactory:225 - Query language substitutions: {}
46:23,312 INFO SettingsFactory:230 - JPA-QL strict compliance: disabled
46:23,312 INFO SettingsFactory:235 - Second-level cache: enabled
46:23,312 INFO SettingsFactory:239 - Query cache: disabled
46:23,328 INFO SettingsFactory:373 - Cache provider: org.hibernate.cache.NoCacheProvider
46:23,328 INFO SettingsFactory:254 - Optimize cache for minimal puts: disabled
46:23,328 INFO SettingsFactory:263 - Structured second-level cache entries: disabled
46:23,328 INFO SettingsFactory:283 - Echoing all SQL to stdout
46:23,328 INFO SettingsFactory:290 - Statistics: disabled
46:23,328 INFO SettingsFactory:294 - Deleted entity synthetic identifier rollback: disabled
46:23,328 INFO SettingsFactory:309 - Default entity-mode: pojo
46:23,328 INFO SettingsFactory:313 - Named query checking : enabled
46:23,328 INFO SessionFactoryImpl:161 - building session factory
46:23,343 INFO SessionFactoryObjectFactory:86 - Factory name: java:hibernate/SessionFactory
46:23,343 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}
46:23,343 INFO SessionFactoryObjectFactory:91 - Bound factory to JNDI name: java:hibernate/SessionFactory
46:23,343 WARN SessionFactoryObjectFactory:101 - InitialContext did not implement EventContext
46:23,343 INFO NamingHelper:25 - @@@Robin : getName()java:/TransactionManager
46:23,359 INFO NamingHelper:26 - JNDI InitialContext properties:{java.naming.provider.url=jnp://localhost:1099, java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory}

Here's my Hibernate.cfg.xml

Code:

<!DOCTYPE hibernate-configuration SYSTEM
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
   <session-factory>
      <property name="hibernate.connection.datasource">
         postgresDS
      </property>
      <property name="hibernate.dialect">
         org.hibernate.dialect.PostgreSQLDialect
      </property>
      <property name="hibernate.session_factory_name">
         java:hibernate/SessionFactory
      </property>
      <!-- Show and print nice SQL on stdout -->
      <property name="show_sql">true</property>
      <property name="format_sql">true</property>

      <!-- JTA stuff -->
      <property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
      <property name="transaction.manager_lookup_class">org.hibernate.transaction.JBossTransactionManagerLookup</property>
      <property name="hibernate.jndi.class">org.jnp.interfaces.NamingContextFactory</property>
      <property name="hibernate.jndi.url">jnp://localhost:1099</property>
      <property name="jta.UserTransaction">java:/UserTransaction</property>
      <!-- List of XML mapping files -->
      <mapping resource="hello/Message.hbm.xml" />
      <mapping resource="com/bcdrg/library/Tbldemographics.hbm.xml" />
   </session-factory>
</hibernate-configuration>

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