Thanks for your answer...
I certainly missed something... The tutorial is really well done, but all they
tell about using the entity manager is only that it should be preceded by the
@PersistenceContext annotation.
This is what my code looks like...
| public class Mediastore implements Serializable {
| @PersistenceContext(unitName="mediastore")
| private EntityManager entityManager ;
| private String hello = "Hello World";
|
| private static final long serialVersionUID = -2416336874715455139L;
|
| @SuppressWarnings("unchecked")
| public Mediastore(){
|
| if(entityManager != null){
| System.out.println("Entity manager created
successfully");
| }
| else {
| System.out.println("Entity Manager is null !");
| }
|
This is the code which helped me to say that the EntityManaged was not injected
correctly, after having had a lot of null pointer exceptions...
Here's my persistence.xml file :
| <persistence>
| <persistence-unit name="mediastore">
| <jta-data-source>java:/mediastoreDS</jta-data-source>
| <properties>
| <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
| <property name="hibernate.cache.use_query_cache" value="true"/>
| <property name="hibernate.show_sql" value="true"/>
| </properties>
| </persistence-unit>
| </persistence>
|
My "mediastore-ds.xml" file :
| <?xml version="1.0" encoding="UTF-8"?>
|
| <datasources>
| <local-tx-datasource>
| <jndi-name>mediastoreDS</jndi-name>
|
<connection-url>jdbc:postgresql://localhost/mediastore</connection-url>
| <driver-class>org.postgresql.Driver</driver-class>
| <user-name>postgres</user-name>
| <password>postgres</password>
| <min-pool-size>5</min-pool-size>
| <max-pool-size>20</max-pool-size>
| <idle-timeout-minutes>10</idle-timeout-minutes>
| <track-statements>true</track-statements>
| </local-tx-datasource>
| </datasources>
|
My ear file is packaged like this :
|
| mediastore.ear
| /META-INF
| application.xml
| mediastore.jar
| /META-INF
| persistence.xml
| /packages/classfiles
|
| mediastore.war
| /WEB-INF
| web.xml
| faces-config.xml
| /lib
| jarfiles
| /classes
| packages/classes
| index.jsp
| home.jsp
|
|
|
I hope this could help someone to see what I did wrong.
Thanks in advance,
rmic.
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