JPA/Glassfish 3-NamingException将EJB注入servlet
我正在部署Glassfish 3.1.1 我有一个创建jar的JPA项目。它有用JPA/Glassfish 3-NamingException将EJB注入servlet,exception,jakarta-ee,jpa,dependency-injection,glassfish-3,Exception,Jakarta Ee,Jpa,Dependency Injection,Glassfish 3,我正在部署Glassfish 3.1.1 我有一个创建jar的JPA项目。它有用@实体注释的标准数据模型类和用@无状态注释的服务类。服务类都继承自GenericServiceBean类: @Stateless public class GenericServiceBean implements GenericService { @PersistenceContext(unitName = "myUnitName") EntityManager em; public Ge
@实体
注释的标准数据模型类和用@无状态
注释的服务类。服务类都继承自GenericServiceBean类:
@Stateless
public class GenericServiceBean implements GenericService
{
@PersistenceContext(unitName = "myUnitName")
EntityManager em;
public GenericServiceBean()
{
// empty
}
public <T> T create(T t)
{
em.persist(t);
return t;
}
public <T> T update(T t)
{
return em.merge(t);
}
public List<?> findWithNamedQuery(String namedQueryName,
Map<String, Object> parameters)
{
return findWithNamedQuery(namedQueryName, parameters, 0);
}
public List<?> findWithNamedQuery(String namedQueryName,
Map<String, Object> parameters, int resultLimit)
{
Query query = this.em.createNamedQuery(namedQueryName);
if (resultLimit > 0)
{
query.setMaxResults(resultLimit);
}
for (Map.Entry<String, Object> entry : parameters.entrySet())
{
query.setParameter(entry.getKey(), entry.getValue());
}
return query.getResultList();
}
}
public class BatchService extends GenericServiceBean
{
public BatchService()
{
super();
}
public Batch create(Batch batch)
{
return this.create(batch);
}
public Batch find(Batch batch)
{
return this.update(batch);
}
public List<Batch> findByStatus(String status)
{
HashMap<String, Object> parameters = new HashMap<String, Object>();
parameters.put("status", status);
return (List<Batch>) this.findWithNamedQuery("Batch.findByStatus",
parameters);
}
}
我有一个servlet,希望将服务bean注入其中:
public class ESwimConnectivityServlet extends HttpServlet
{
@EJB
private BatchService batchService;
@Override
protected void service(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
log.debug("Enter service()");
this.processRequest(request, response);
log.debug("Exit service()");
String message = ("Connecting to database: ");
try
{
List<Batch> batches = batchService.findByStatus(ProcessingStatusEnum.SUCCESS.toString());
message += "SUCESS - batch query returned " + batches.size();
}
catch (Throwable t)
{
message += "FAIL - see log for details";
log.error("Could not query database", t);
}
response.getWriter().write(message + "\n");
}
}
我不知道我在代码或配置中做错了什么导致了这个问题。任何帮助调试都将不胜感激 我认为您必须使用
@Stateless
注释对BatchService
类进行注释,以使其可注入。我不确定,但我认为注释无法继承。来自其他来源:
会话bean无法扩展会话bean
规范EJB核心4.6.2
会话bean类可能有超类和/或超接口。
会话bean类不能有本身就是会话bean类的超类。是的,这就是问题所在。谢谢
public class ESwimConnectivityServlet extends HttpServlet
{
@EJB
private BatchService batchService;
@Override
protected void service(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
log.debug("Enter service()");
this.processRequest(request, response);
log.debug("Exit service()");
String message = ("Connecting to database: ");
try
{
List<Batch> batches = batchService.findByStatus(ProcessingStatusEnum.SUCCESS.toString());
message += "SUCESS - batch query returned " + batches.size();
}
catch (Throwable t)
{
message += "FAIL - see log for details";
log.error("Could not query database", t);
}
response.getWriter().write(message + "\n");
}
}
Caused by: javax.naming.NamingException:
Lookup failed for 'java:comp/env/com.mycompany.MyServlet/batchService' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming}
[Root exception is javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=com.mycompany.MyServlet/batchService,Remote 3.x interface =com.mycompany.service.BatchService,ejb-link=null,lookup=,mappedName=,jndi-name=com.mycompany.service.BatchService,refType=Session' . Actual (possibly internal) Remote JNDI name used for lookup is 'com.mycompany.service.BatchService#com.mycompany.service.BatchService'
[Root exception is javax.naming.NamingException: Lookup failed for 'com.mycompany.service.BatchService#com.mycompany.service.BatchService' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming}
[Root exception is javax.naming.NameNotFoundException: com.mycompany.service.BatchService#com.mycompany.service.BatchService not found]]]