Error creating entityManagerFactory due to error tying to scan

Question

I am following http://spring.io/guides/tutorials/data/3 ; I am not sure what I did wrong, but I keep on getting exceptions that I don\'t understand. I tried searching for q

Answer 1

First, get the version of javassist that works with Java 8:

<dependency> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> <version>3.18.2-GA</version> </dependency>

If you use maven, exclude all others javassist dependencies:

`<exclusions>
     <exclusion>
        <artifactId>javassist</artifactId>
        <groupId>org.javassist</groupId>
     </exclusion>
 </exclusions>`

Answer 2

I had similar issue. My problem was that I had another dependency (in my case jboss weld) that used different version of javassist. Excluding did not help.

    <dependency>
        <groupId>org.jboss.weld</groupId>
        <artifactId>weld-se</artifactId>
        <version>1.0.1-Final</version>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <artifactId>javassist</artifactId>
                <groupId>org.javassist</groupId>
            </exclusion>
        </exclusions>
    </dependency>

So, above exclusion does not work. I had to find a workaround for jboss weld.

Answer 3

The error:

invalid constant type: 18

Indicates that you have built the Jars with Java 8, but are attempting to run the application in a lower version.

From what I have seen elsewhere, you probably need to switch to a newer version of javassist (which is raising the error), as the version you are using is not compatible with Java 8.

Answer 4

If you use 3.6.10-Final you need exclude javassist (without org. prefix)

    <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>3.6.10.Final</version>
            <scope>compile</scope>
            <exclusions>
                <exclusion>
                    <artifactId>javassist</artifactId>
                    <groupId>javassist</groupId>
                </exclusion>
            </exclusions>
        </dependency>
       <!-- javassist with fixed https://issues.jboss.org/browse/JASSIST-174 -->
       <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.18.2-GA</version>
        </dependency>

Answer 5

I had the same problem while migrating one of my projects to Java 8. Fixed it by updating the hibernate-entitymanager artifact version from 4.2.0.Final to 4.3.8.Final.

Answer 6

You do not need to provide beans for EntityManagerFactory and EntityManager. Just provide a bean LocalContainerEntityManagerFactoryBean