Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named helloworld[Line breaks added for readability]
There can be at least three different causes, one not so obvious.
- Your persistence.xml file cannot be found - it does not reside in a folder called META-INF that is located in classpath root
- Your persistence.xml file does not contain a persistence-unit with the given name (helloworld in this case)
- The tricky one - you have a problem with dependencies
I had problem #3. The error message suggested something different, but actually my dependencies were screwed up. Here's an example of correct dependencies (hibernate-entitymanager was the one causing problems).
... <dependencies> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate</artifactId> <version>3.5.3-Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>3.5.3-Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-annotations</artifactId> <version>3.5.3-Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-commons-annotations</artifactId> <version>3.3.0.ga</version> </dependency> <dependency> <groupId>org.hibernate.javax.persistence</groupId> <artifactId>hibernate-jpa-2.0-api</artifactId> <version>1.0.0.Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>3.5.3-Final</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>hsqldb</groupId> <artifactId>hsqldb</artifactId> <version>1.8.0.7</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>3.0.3.RELEASE</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>3.0.3.RELEASE</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jpa</artifactId> <version>2.0.8</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>3.0.3.RELEASE</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.5.8</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-simple</artifactId> <version>1.5.8</version> </dependency> <dependency> <groupId>commons-collections</groupId> <artifactId>commons-collections</artifactId> <version>3.1</version> <type>jar</type> <scope>compile</scope> </dependency> </dependencies> ...
So what was the actual dependency problem that you had?
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drdgrove, I don't know exactly which class was outdated - the error message did not let me figure it out and I left it as it was.
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