Could not initialize class JavaReflection

By migrating to Hibernate 3.6.4.FINAL and Spring 3.0.5.RELEASE I got this Exception:

Could not initialize class org.hibernate.annotations.common.reflection.java.JavaReflection

I could solve the problem by adding this to my pom.

       <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.6.1</version>
            <scope>compile</scope>
        </dependency>