[main] WARN GenericApplicationContext:591 – Exception encountered during context initialization – cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sessionFactory’ defined in class path resource : Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: net/bytebuddy/TypeCache
On upgrading Hibernate from version 3 to version 5, I got the above error. Turned out that we were also using Mockito and it also has a dependency on byte buddy. So there was conflict of versions of byet buddy. So here is fix: <dependency><groupId>org.mockito</groupId><artifactId>mockito-core</artifactId><version>2.2.28</version><scope>test</scope><exclusions><exclusion><groupId>net.bytebuddy</groupId><artifactId>byte-buddy</artifactId></exclusion></exclusions></dependency> exclude the byte-buddy jar from mockito.