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POJPA - createEntityManagerFactory returns Null
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  1. POJPA - createEntityManagerFactory returns Null
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    copied!<p>Noob question here. I'm following <a href="http://schuchert.wikispaces.com/JPA+Tutorial+1+-+Getting+Started#Create%20Your%20First%20Entity" rel="nofollow noreferrer">this example/tutorial</a> to try and isolate a problem I keep getting on my main project. Problem is, the entityManagerFactory keeps returning null (thus, I get a NullPointerExcept when trying to run the first JUnit test.)</p> <p>I'm currently on Eclipse Indigo (JavaEE) - JRE7 - Hibernate 3.6.7 and JBoss 7</p> <p>And here's my persistence.xml (again, a copipasta taken right from the tutorial)</p> <pre><code>&lt;persistence&gt; &lt;persistence-unit name="examplePersistenceUnit" transaction-type="RESOURCE_LOCAL"&gt; &lt;properties&gt; &lt;property name="hibernate.show_sql" value="false" /&gt; &lt;property name="hibernate.format_sql" value="false" /&gt; &lt;property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver" /&gt; &lt;property name="hibernate.connection.url" value="jdbc:hsqldb:mem:mem:aname" /&gt; &lt;property name="hibernate.connection.username" value="sa" /&gt; &lt;property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" /&gt; &lt;property name="hibernate.hbm2ddl.auto" value="create" /&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>Things I've already tried/found out so far:</p> <ul> <li><p>Seems this problem <a href="https://stackoverflow.com/questions/7189066/jpa-entitymanager-is-not-initialized-null">tends to occur</a> if you try to create a factory with a persistence unit that is not listed in the persistence.xml</p></li> <li><p>Double-checked that the necessary JARs are included in Eclipse's Build Path Libraries, which Google suggested may be a possible cause for a createEntityManagerFactory() call to short-circuit and return null (instead of just throwing an exception or logging a message)</p></li> <li><p>Might be due to a possible error <a href="https://stackoverflow.com/questions/4003069/jpa-and-derby-null-pointer-exception">whilst configuring</a> Hibernate connection?</p></li> </ul> <p>I've been hitting this wall for the past couple of weeks, so it goes without saying that any help/general direction tips are MUCH appreciated :D</p>
 

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