Pessoal,
Veja a minha implementação de código para um Dao com Jpa
Interface Dao
public interface Dao<K, E> {
public void persist(E entity);
public void remove(E entity);
public void merge(E entity);
public E find(K id);
public List<E> getAll();
}Classe abstrata de implementação do Dao
public abstract class DefaultJpaDao<K, E> implements Dao<K, E> {
protected Class<E> entityClass;
@PersistenceContext(unitName = "ejbPU")
protected EntityManager entityManager;
public DefaultJpaDao() {
ParameterizedType genericSuperclass = (ParameterizedType) getClass().getGenericSuperclass();
this.entityClass = (Class<E>) genericSuperclass.getActualTypeArguments()[1];
}
@Override
public void persist(E entity) {
entityManager.persist(entity);
}
@Override
public void remove(E entity) {
E removeEntiy = entityManager.merge(entity);
entityManager.remove(removeEntiy);
}
@Override
public void merge(E entity) {
entityManager.merge(entity);
}
@Override
public E find(K id) {
return entityManager.find(entityClass, id);
}
@Override
public List<E> getAll() {
Query query = entityManager.createQuery("SELECT e FROM " + entityClass.getSimpleName() + " e");
return query.getResultList();
}
}Interface que extende a interface Dao (nao tem os métodos especificos ainda
public interface DaoBras extends Dao<String, Bras> {
}Classe que implementa a interface anterior e estende a classe abstrada
@Stateless(name="daoBras")
@LocalBean()
public class DaoBrasJpa extends DefaultJpaDao<String, Bras> implements DaoBras {
}Agora como eu chamo este EJB
@EJB(name="daoBras")
private DaoBras daoBras;Quando eu rodo a aplicação recebo esta mensagem:
Grave: Exception while loading the app : EJB Container initialization error
java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at br.com.gvt.acct.dao.DefaultJpaDao.<init>(DefaultJpaDao.java:25)
at br.com.gvt.acct.dao.DaoBrasJpa.<init>(DaoBrasJpa.java:17)
at br.com.gvt.acct.dao.__EJB31_Generated__DaoBrasJpa__Intf____Bean__.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at com.sun.ejb.containers.BaseContainer.instantiateOptionalEJBLocalBusinessObjectImpl(BaseContainer.java:3887)
at com.sun.ejb.containers.StatelessSessionContainer.initializeHome(StatelessSessionContainer.java:253)
at com.sun.ejb.containers.ContainerFactoryImpl.createContainer(ContainerFactoryImpl.java:167)
at org.glassfish.ejb.startup.EjbApplication.loadContainers(EjbApplication.java:230)
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:299)
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:105)
at org.glassfish.internal.data.ModuleInfo.load(ModuleInfo.java:186)
at org.glassfish.internal.data.ApplicationInfo.load(ApplicationInfo.java:264)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:460)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:389)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:461)
at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:212)
at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)