What's wrong with this components.xml / persistence.xml pair

[mlh496]

Hey everyone,

I'm having trouble getting my Seam app to run on Tomcat; the entityManager is not being injected into my Seam objects, most notably the EntityQuery objects. [Note: This app works fine on JBoss, so this is a config issue.]

Here is my components.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<components xmlns="http://jboss.com/products/seam/components"
 xmlns:core="http://jboss.com/products/seam/core"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:framework="http://jboss.com/products/seam/framework"
 xsi:schemaLocation=
 "http://jboss.com/products/seam/core
 http://jboss.com/products/seam/core-1.1.xsd
 http://jboss.com/products/seam/components
http://jboss.com/products/seam/components-1.1.xsd">

 <core:init jndi-pattern="#{ejbName}/local" debug="true"/>

 <core:microcontainer installed="true"/>

 <core:manager conversation-timeout="120000"/>

 <core:ejb installed="true"/>
</components>

And here is my persistence.xml file:

<persistence>
 <persistence-unit name="omega">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/omegaDatasource</jta-data-source>
 <properties>
 <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
 <property name="hibernate.hbm2ddl.auto" value="none"/>
 </properties>
 </persistence-unit>
</persistence>

Thank you sincerely,
-Michael

[fernando_jmt]

It seems you need the next line in you components.xml

 <core:managed-persistence-context name="entityManager" auto-create="true" persistence-unit-jndi-name="java:/omegaDatasource"/>

HTH.

[mlh496]

Thank you so much for your response. At least now I'm getting different error messages. :-)

There seems to be some conflicts in the Seam documentation. Do you need a "entity-manager-factory" node as well? In some places I've read where this configuration is needed (even though it never works for me):

<core:managed-persistence-context name="entityManager"
 auto-create="true"
 entity-manager-factory="#{omegaEntityManagerFactory}"/>

 <core:entity-manager-factory name="omegaEntityManagerFactory"
 persistence-unit-name="omega"/>

In Seam 1.2, which is the correct way to create the entityManager component when deploying to Tomcat?

All the best,
-Michael

[mlh496]

BTW, I wasn't being sarcastic. I was ramming against the "null entityManager" error for quite some time, and your recommended config line has definitely pushed me closer to the finish line. Again, thank you.

-Michael

[stu2]

"mlh496" wrote:
Thank you so much for your response. At least now I'm getting different error messages. :-)

There seems to be some conflicts in the Seam documentation. Do you need a "entity-manager-factory" node as well? In some places I've read where this configuration is needed (even though it never works for me):

<core:managed-persistence-context name="entityManager"
 auto-create="true"
 entity-manager-factory="#{omegaEntityManagerFactory}"/>

 <core:entity-manager-factory name="omegaEntityManagerFactory"
 persistence-unit-name="omega"/>

In Seam 1.2, which is the correct way to create the entityManager component when deploying to Tomcat?

All the best,
-Michael

I'm using the EntityQuery successfully, and in my components.xml I have

 <core:managed-persistence-context name="entityManager" auto-create="true"
 persistence-unit-jndi-name="java:/fbEntityManagerFactory" />

All of the Seam framework components (EntityController, Homes and Queries expect to find persistence-context named entityManger, though you can override these (look at the source, there's a getPersistenceContextName() method in each).

What exceptions are you seeing?

[fernando_jmt]

Ok, I will describe what I have in my configuration files when I deploy to Tomcat.

1.- My components.xml

 <core:managed-persistence-context name="entityManager" auto-create="true"
 persistence-unit-jndi-name="java:/myappEntityManagerFactory"/>

2.- My persistence.xml

 <persistence-unit name="myappPU">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/myappDatasource</jta-data-source>
 <properties>
 <property name="hibernate.hbm2ddl.auto" value="update"/>
 <property name="hibernate.cache.use_query_cache" value="true"/>
 <property name="hibernate.show_sql" value="true"/>
 <!-- These are the default for JBoss EJB3, but not for HEM: -->
 <property name="jboss.entity.manager.factory.jndi.name" value="java:/myappEntityManagerFactory"/>
 </properties>
 </persistence-unit>

3.- META-INF jboss-beans.xml

<bean name="myappDatasourceBootstrap" class="org.jboss.resource.adapter.jdbc.local.LocalTxDataSource">
 <property name="driverClass">com.mysql.jdbc.Driver</property>
 <property name="connectionURL">jdbc:mysql://192.168.10.1:3306/myapp</property>
 <property name="userName"><value class="java.lang.String">fernando</value></property>
 <property name="password"><value class="java.lang.String">fernando</value></property>
 <property name="jndiName">java:/myappDatasource</property>
 <property name="minSize">0</property>
 <property name="maxSize">10</property>
 <property name="blockingTimeout">1000</property>
 <property name="idleTimeout">100000</property>
 <property name="transactionManager"><inject bean="TransactionManager"/></property>
 <property name="cachedConnectionManager"><inject bean="CachedConnectionManager"/></property>
 <property name="initialContextProperties"><inject bean="InitialContextProperties"/></property>
 </bean>

 <bean name="myappDatasource" class="java.lang.Object">
 <constructor factoryMethod="getDatasource">
 <factory bean="myappDatasourceBootstrap"/>
 </constructor>
 </bean>

HTH.

[mlh496]

I believe my jboss-beans.xml, persistence.xml and components.xml files are correct. I now receive the following error:

javax.faces.el.EvaluationException: Cannot get value for expression '#{usersList.firstResult}'
 at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:402)
...
...
Caused by: java.lang.IllegalArgumentException: EntityManagerFactory not found in JNDI
 at org.jboss.seam.core.ManagedPersistenceContext.getEntityManagerFactoryFromJndiOrValueBinding(ManagedPersistenceContext.java:140)
...
...

Caused by: javax.naming.NameNotFoundException: omegaDatasource not bound
 at org.jnp.server.NamingServer.getBinding(NamingServer.java:529)
...
...

Here is my components.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<components xmlns="http://jboss.com/products/seam/components"
 xmlns:core="http://jboss.com/products/seam/core"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation=
 "http://jboss.com/products/seam/core
 http://jboss.com/products/seam/core-1.1.xsd
 http://jboss.com/products/seam/components
http://jboss.com/products/seam/components-1.1.xsd">

 <core:init jndi-pattern="#{ejbName}/local" debug="true"/>

 <core:manager conversation-timeout="120000"/>

 <core:managed-persistence-context name="entityManager"
 persistence-unit-jndi-name="java:/omegaDatasource"
 auto-create="true"/>


 <core:ejb installed="true"/>

</components>

It seems that I do need to have an entity-manager-factory node for this to work on Tomcat. However, I have also noticed that if I take the 2 beans in my jboss-beans.xml file and put them in the embedded-jboss-beams.xml file, then I have fewer problems. However, according to the Seam documentation, this should not be necessary.

-Michael

[fernando_jmt]

You don't need to add application specific configuration to embedded-jboss-beans.xml. app/MET-INF/jboss-beans.xml are for that.

If you still have the problems, can we see your jboss-beans.xml and persistence.xml content?

[mlh496]

Here is my persistence.xml file:

<persistence>
 <persistence-unit name="omegaFactory">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/omegaDatasource</jta-data-source>
 <properties>
 <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
 <property name="hibernate.transaction.flush_before_completion" value="true"/>
 <property name="hibernate.show_sql" value="true"/>
 <property name="jboss.entity.manager.factory.jndi.name" value="java:/omegaDatasource"/>
 <property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider"/>
 <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTransactionManagerLookup"/>
 </properties>
 </persistence-unit>
</persistence>

And here is my jboss-beans.xml file:

<?xml version="1.0" encoding="UTF-8"?>

<deployment xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="urn:jboss:bean-deployer bean-deployer_1_0.xsd"
 xmlns="urn:jboss:bean-deployer:2.0">

 <bean name="omegaDatasourceBootstrap" class="org.jboss.resource.adapter.jdbc.local.LocalTxDataSource">
 <property name="driverClass">com.mysql.jdbc.Driver</property>
 <property name="connectionURL">jdbc:mysql://localhost:3306/omega</property>
 <property name="userName"><value class="java.lang.String">username</value></property>
 <property name="password"><value class="java.lang.String">password</value></property>
 <property name="jndiName">java:/omegaDatasource</property>
 <property name="minSize">0</property>
 <property name="maxSize">10</property>
 <property name="blockingTimeout">1000</property>
 <property name="idleTimeout">100000</property>
 <property name="transactionManager"><inject bean="TransactionManager"/></property>
 <property name="cachedConnectionManager"><inject bean="CachedConnectionManager"/></property>
 <property name="initialContextProperties"><inject bean="InitialContextProperties"/></property>
 </bean>

 <bean name="omegaDatasource" class="java.lang.Object">
 <constructor factoryMethod="getDatasource">
 <factory bean="omegaDatasourceBootstrap"/>
 </constructor>
 </bean>
</deployment>

When I turn logging to debug, this seems to be the error that starts it all:

Caused by: java.lang.NullPointerException
 at org.jboss.seam.core.ManagedPersistenceContext.getEntityManager(ManagedPersistenceContext.java:96)

Thank you for taking a look at this,
-Michael

[fernando_jmt]

Maybe I'm wrong, but it could be because you have the same name for jta-data-source (java:/omegaDatasource) and also the same one for jboss.entity.manager.factory.jndi.name (java:/omegaDatasource).

Try changing the name of jboss.entity.manager.factory.jndi.name (persistence.xml) to java:/omegaEntityManagerFactory and then change the components.xml to use it, as follows:

<core:managed-persistence-context name="entityManager"
 persistence-unit-jndi-name="java:/omegaEntityManagerFactory"
 auto-create="true"/>

[mlh496]

It seems the entity manager is not getting inject into the right place. I continue to get this error:

Caused by: java.lang.NullPointerException
 at org.jboss.seam.core.ManagedPersistenceContext.getEntityManager(ManagedPersistenceContext.java:96)

Here are my updated persistence.xml, components.xml and jboss-beans.xml files:

persistence.xml

<persistence>
 <persistence-unit name="omegaFactory">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/omegaDatasource</jta-data-source>
 <properties>
 <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
 <property name="hibernate.transaction.flush_before_completion" value="true"/>
 <property name="hibernate.show_sql" value="true"/>
 <property name="jboss.entity.manager.factory.jndi.name" value="java:/omegaEntityDatasource"/>
 <property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider"/>
 <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTransactionManagerLookup"/>
 </properties>
 </persistence-unit>
</persistence>

components.xml

<?xml version="1.0" encoding="UTF-8"?>
<components xmlns="http://jboss.com/products/seam/components"
 xmlns:core="http://jboss.com/products/seam/core"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation=
 "http://jboss.com/products/seam/core
 http://jboss.com/products/seam/core-1.1.xsd
 http://jboss.com/products/seam/components
http://jboss.com/products/seam/components-1.1.xsd">

 <core:init jndi-pattern="#{ejbName}/local" debug="true"/>

 <core:manager conversation-timeout="120000"/>

 <core:managed-persistence-context name="entityManager"
 persistence-unit-jndi-name="java:/omegaEntityDatasource"
 auto-create="true"/>


 <core:ejb installed="true"/>

</components>

jboss-beans.xml

<?xml version="1.0" encoding="UTF-8"?>

<deployment xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="urn:jboss:bean-deployer bean-deployer_1_0.xsd"
 xmlns="urn:jboss:bean-deployer:2.0">

 <bean name="omegaDatasourceBootstrap" class="org.jboss.resource.adapter.jdbc.local.LocalTxDataSource">
 <property name="driverClass">com.mysql.jdbc.Driver</property>
 <property name="connectionURL">jdbc:mysql://localhost:3306/omega</property>
 <property name="userName"><value class="java.lang.String">username</value></property>
 <property name="password"><value class="java.lang.String">password</value></property>
 <property name="jndiName">java:/omegaDatasource</property>
 <property name="minSize">0</property>
 <property name="maxSize">10</property>
 <property name="blockingTimeout">1000</property>
 <property name="idleTimeout">100000</property>
 <property name="transactionManager"><inject bean="TransactionManager"/></property>
 <property name="cachedConnectionManager"><inject bean="CachedConnectionManager"/></property>
 <property name="initialContextProperties"><inject bean="InitialContextProperties"/></property>
 </bean>

 <bean name="omegaDatasource" class="java.lang.Object">
 <constructor factoryMethod="getDatasource">
 <factory bean="omegaDatasourceBootstrap"/>
 </constructor>
 </bean>
</deployment>

Surely some permutation should work. :-)
-Michael

[mlh496]

Looking through the log-file, I see this error:

16:14:20,044 INFO [Component] Component: entityManager, scope: CONVERSATION, type: JAVA_BEAN, class: org.jboss.seam.core.ManagedPersistenceContext
16:14:20,044 DEBUG [Component] entityManager.entityManagerFactory=omegaDatabase
 16:14:20,060 ERROR [[/omega]] Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener
 java.lang.IllegalArgumentException: No converter for type: org.jboss.seam.core.Expressions$ValueBinding
 at org.jboss.seam.util.Conversions.getConverter(Conversions.java:55)
 at org.jboss.seam.Component$ConstantInitialValue.<init>(Component.java:1998)

This suggests that Seam is succeeding in making an entityManagerFactory instance, but cannot pass it to the SeamListener. How to fix this? I have no idea... Seam continues to tease me...

-Michael

[fernando_jmt]

I never seen an exception like that, I don't know the reason. But can I take a look to your complete log (since starting components up to final exception stack trace)?

[mlh496]

I hope I'm not being too forward, but could you perhaps send me a WAR file that works for you on Tomcat 5.5? (Perhaps a simple app that has a single table in MySql.) My e-mail address is [e-mail]
If I had a working MySql example on Tomcat 5.5, then I'm sure that I could identify where I am going wrong.

Thank you again for your help. I've been stuck in configuration heck for 12 days now, and you've been most helpful.

-Michael

[fernando_jmt]

I have a sample running in tomcat (a simple one), I'll send you to the mail you provide me right away.