SavePersonHandler.java

package de.mukis.gemini.sample.rcp.handlers;

import javax.inject.Inject;
import javax.inject.Named;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;

import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.gemini.ext.di.GeminiPersistenceContext;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Shell;

import de.mukis.gemini.sample.model.Person;

/**
 * The easiest way to get an {@link EntityManager} injected.
 * 
 * @author muki
 * 
 */
public class SavePersonHandler {

    @Inject
    @GeminiPersistenceContext(unitName = "configured")
    private EntityManager em;

    @Execute
    public void execute(@Named(IServiceConstants.ACTIVE_SHELL) Shell shell) {
        try {
            EntityTransaction tx = em.getTransaction();
            tx.begin();
            Person person = new Person();
            person.setFirstName("John");
            person.setLastName("Smith");
            em.persist(person);
            tx.commit();
            MessageDialog.openInformation(shell, "Person persisted", "Persisted person in test database!");
        } catch (Exception e) {
            MessageDialog.openError(shell, "Error persisting Person", "Derby bundle is not installed \n " + e.getMessage());
        } finally {
            em.clear();
        }

    }
}