WebSphere 7 & Javax/Persistence/OneToMany.OrphanRemoval() Error

Problem

In Hibernate development, contains a model class with JPA @OneToMany annotation :

    @OneToMany(    cascade=CascadeType.ALL,     fetch = FetchType.LAZY, mappedBy = "user")    public Set<Debit> getDebits() {        return this.debits;    }

When web application is deployed on WebSphere 7, it hit following error message :

Caused by: java.lang.NoSuchMethodError: javax/persistence/OneToMany.orphanRemoval()Z	at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1912)	at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:707)	... 118 more

P.S hibernate-jpa-2.0-api-1.0.0.Final.jar is included in the library path.

Solution

The OneToMany.orphanRemoval is specified in JPA 2.0, and look like WebSphere 7 contains older JPA library, which is loaded before your hibernate-jpa-2.0-api-1.0.0.Final.jar.

To fix it, put your JPA 2.0 (hibernate-jpa-2.0-api-1.0.0.Final.jar) library in the WebSphere’s highest priority class loader folder, which is under WAS7_FOLDER\AppServer\java\jre\lib\ext. Restart WebSphere server instance to take effect.

Now access WebSphere web console –> Troubleshooting –> Class loader viewer, make sure your library is loaded.

Now, WebSphere 7 will always load your Hibernate JPA 2.0 library.