Tuesday, August 27, 2013

GWT : exception when running incoming RPC call on EclipseLink

I'm writing a project with Eclipse using EclipseLink ,hsqldb and GWT . When I try a do a RPC I always get stuck on this exception :

SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract void it.myProject.client.service.EmployeeService.createEmployee()' threw an unexpected exception: javax.persistence.PersistenceException: No persistence providers available for >"myDB" after trying the following discovered implementations: org.datanucleus.api.jpa.PersistenceProviderImpl

This is my main file myProject.java where I execute the RPC:

public class MyProject implements EntryPoint {       private final EmployeeServiceAsync aService = (EmployeeServiceAsync)             GWT.create(EmployeeService.class);       @Override     public void onModuleLoad() {         aService.createEmployee(new AsyncCallback<Void>() {          @Override          public void onFailure(Throwable caught) {              Window.alert("Creation Employees failed!");          }          @Override          public void onSuccess(Void result) {              Window.alert("Creation success!");          }      });

I've specified the name of my Database and the provider in persistence.xml :

 <persistence-unit name="myDB" transaction-type="RESOURCE_LOCAL">  

In my build path I've put: eclipselink.jar ; gwt-servlet.jar ; hsqldb.jar ; javax.persistence_2.0.4.jar ; persistence-api-sources-2.0.jar ; smartgwt.jar

Please give any advices you think and feel free to ask if you need other code or anything.
I'm blocked on this since a week and noone in the web seems to have the same problem .


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