我创建了两个 rcp-bundle。第一个包实现 JPA - 服务，第二个 - 客户端。使用下一个技术：
OSGi、JPA Eclipselink、RCP Eclipse、RAP Eclipse、Eclipse Equinox
服务包：
public class JpaUtil {
private static EntityManagerFactory emf;
private static Map<String, Object> properties = new HashMap<String, Object>();
public EntityManagerFactory getEntityManagerFactory() {
try {
properties.put(PersistenceUnitProperties.JDBC_DRIVER, "org.postgresql.Driver");
properties.put(PersistenceUnitProperties.JDBC_URL, "jdbc:postgresql://localhost:5432/db");
properties.put(PersistenceUnitProperties.JDBC_USER, "db");
properties.put(PersistenceUnitProperties.JDBC_PASSWORD, "db");
properties.put(PersistenceUnitProperties.CLASSLOADER, this.getClass().getClassLoader());
emf = new PersistenceProvider().createEntityManagerFactory("service", properties);
} catch (Throwable e) {
System.err.println("Error create initializer SessionFactory " + e);
e.printStackTrace();
throw new ExceptionInInitializerError(e);
}
return emf;
}
}
DAO 实现：
public class HotelJPAImpl implements HotelJPA {
@Override
public boolean checkStatusRoom(Integer numbRoom) {
EntityManager em = new JpaUtil().getEntityManagerFactory().createEntityManager();
boolean status;
try{
Long l = Long.valueOf(numbRoom.longValue());
Hotel hotel = (Hotel) em.find(Hotel.class, numbRoom);
status = hotel.getIsStatus();
}finally{
em.close();
}
return status;
}
}
服务激活器：
public class ServiceActivator implements BundleActivator {
ServiceRegistration<HotelJPA> ServiceRegistration;
@Override
public void start(BundleContext context) throws Exception {
HotelJPA hotelJPA = new HotelJPAImpl();
ServiceRegistration = (ServiceRegistration<HotelJPA>) context
.registerService(HotelJPA.class.getName(), hotelJPA,
null);
}
@Override
public void stop(BundleContext context) throws Exception {
ServiceRegistration.unregister();
}
}
持久性.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="service">
<class>service.table.Hotel</class>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/db" />
<property name="javax.persistence.jdbc.user" value="db" />
<property name="javax.persistence.jdbc.password" value="db" />
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
</properties>
</persistence-unit>
</persistence>
客户端捆绑包：
活化剂：
public class Activator implements BundleActivator {
ServiceReference<HotelJPA> serviceReference;
@Override
public void start(BundleContext context) throws Exception {
serviceReference = (ServiceReference<HotelJPA>)context.getServiceReference(HotelJPA.class.getName());
HotelJPA hotelJPA = (HotelJPA) context.getService(serviceReference);
System.out.println(hotelJPA.checkStatusRoom(1));
}
@Override
public void stop(BundleContext context) throws Exception {
context.ungetService(serviceReference);
}
}
当我开始捆绑是这样一个例外：
!SESSION 2013-10-05 19:21:27.348 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.7.0_25
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Command-line arguments: -dev file:C:/My_documents/Java/eclipse/workspace/.metadata/.plugins/org.eclipse.pde.core/RAP/dev.properties -os win32 -ws win32 -arch x86_64 -consoleLog -console -data C:\My_documents\Java\eclipse\workspace/.metadata/.plugins/org.eclipse.rap.tools.launch/RAP
!ENTRY com.client 4 0 2013-10-05 19:21:27.898
!MESSAGE FrameworkEvent ERROR
!STACK 0
org.osgi.framework.BundleException: Exception in hotel.client.Activator.start() of bundle com.client.
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:390)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1176)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
Caused by: java.lang.NoClassDefFoundError: org/eclipse/persistence/jpa/PersistenceProvider
at hotel.service.daoimpl.HotelJPAImpl.checkStatusRoom(HotelJPAImpl.java:70)
at hotel.client.Activator.start(Activator.java:21)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
... 12 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.persistence.jpa.PersistenceProvider cannot be found by com.service_1.0.0.qualifier
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more
Root exception:
java.lang.NoClassDefFoundError: org/eclipse/persistence/jpa/PersistenceProvider
at hotel.service.daoimpl.HotelJPAImpl.checkStatusRoom(HotelJPAImpl.java:70)
at hotel.client.Activator.start(Activator.java:21)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:390)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1176)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
原因：java.lang.ClassNotFoundException：com.service_1.0.0.qualifier 找不到 org.eclipse.persistence.jpa.PersistenceProvider
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more
!ENTRY org.eclipse.osgi 4 0 2013-10-05 19:21:27.901
!MESSAGE Bundle com.client_1.0.0.qualifier [52] is not active.