Question

我有一组代码可以在Glassfish 3.1.2上的JDK 1.6中部署和执行。但是，如果我们更新到Glassfish 4和JDK 1.7，我们会在尝试部署应用程序时遇到以下错误：

org.jboss.weld.exceptions.IllegalArgumentException: WELD-001407 Cannot declare an injection point with a type variable: [BackedAnnotatedField] @Inject protected com.co.ejb.web.AjaxGridServlet.sourceInstance 
at org.jboss.weld.manager.InjectionTargetFactoryImpl.createInjectionTarget(InjectionTargetFactoryImpl.java:82)
at org.jboss.weld.manager.InjectionTargetFactoryImpl.createInjectionTarget(InjectionTargetFactoryImpl.java:68)
at org.jboss.weld.manager.BeanManagerImpl.createInjectionTarget(BeanManagerImpl.java:1039)
at org.jboss.weld.manager.BeanManagerImpl.fireProcessInjectionTarget(BeanManagerImpl.java:1197)
at org.glassfish.weld.WeldDeployer.firePITEvent(WeldDeployer.java:390)
at org.glassfish.weld.WeldDeployer.fireProcessInjectionTargetEvents(WeldDeployer.java:360)
at org.glassfish.weld.WeldDeployer.event(WeldDeployer.java:212)
at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131)
at org.glassfish.internal.data.ApplicationInfo.load(ApplicationInfo.java:328)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:493)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:537)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:546)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1423)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1500(CommandRunnerImpl.java:108)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1762)
at org.glassfish.deployment.autodeploy.AutoOperation.run(AutoOperation.java:164)
at org.glassfish.deployment.autodeploy.AutoDeployer.deploy(AutoDeployer.java:595)
at org.glassfish.deployment.autodeploy.AutoDeployer.deployAll(AutoDeployer.java:482)
at org.glassfish.deployment.autodeploy.AutoDeployer.run(AutoDeployer.java:410)
at org.glassfish.deployment.autodeploy.AutoDeployer.run(AutoDeployer.java:401)
at org.glassfish.deployment.autodeploy.AutoDeployService$1.run(AutoDeployService.java:233)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
Caused by: org.jboss.weld.exceptions.DefinitionException: WELD-001407 Cannot declare an injection point with a type variable: [BackedAnnotatedField] @Inject protected com.co.ejb.web.AjaxGridServlet.sourceInstance
at org.jboss.weld.bootstrap.Validator.checkFacadeInjectionPoint(Validator.java:765)
at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDefinitionErrors(Validator.java:352)
at org.jboss.weld.injection.producer.InjectionTargetService.validateProducer(InjectionTargetService.java:39)
at org.jboss.weld.manager.InjectionTargetFactoryImpl.createInjectionTarget(InjectionTargetFactoryImpl.java:79)
... 24 more

有问题的文件是：

BaseJasonServlet

public abstract class BaseJsonServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }

    protected void doProcess(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        this.process(request, response);
    }

    protected abstract void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;
}

扩展BaseJsonServlet的AjaxGridServlet。问题出在我们注入TSource实例的文件中。

public abstract class AjaxGridServlet<TSource extends AjaxGridSource<?,?>> extends BaseJsonServlet {
    private static final long serialVersionUID = 1L;

    @Inject
    protected Instance<TSource> sourceInstance;

    @Override
    protected void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        TSource source= sourceInstance.get();
        source.process(request, response);
        response.getWriter().write(source.toJsonString());
        }
}

AjaxGridServlet然后由webservlet扩展

@WebServlet("/api/admin-dashboard")
public class AdminDashboard extends AjaxGridServlet<AdminDashboardSource> {
    private static final long serialVersionUID = 1L;
}

非常感谢任何帮助。感谢。

Answer 1

消息告诉您的是，您不能拥有带有类型变量的实例。也就是说，你不能在那里使用TSource。

您应该使用Instance<AjaxGridSource>代替。

Answer 2

尝试

@Inject
protected Instance<AjaxGridSource> sourceInstance;

因为反射检测到通用参数的正确运行时类型非常复杂。

Answer 3

将注射向前移动到子类中。

CDI注入抽象类

3 个答案: