检索应用程序处理程序时的 NPE

Question

使用 Dropwizard 1.3.17，我们检索 ServiceLocator：

ServiceLocator serviceLocator = ((ServletContainer) environment.getJerseyServletContainer()).getApplicationHandler().getServiceLocator();

当我们迁移到 Dropwizard 2 时，这变成了：

ServletContainer servletContainer = (ServletContainer) Objects.requireNonNull(environment.getJerseyServletContainer());
ApplicationHandler applicationHandler = servletContainer.getApplicationHandler();
InjectionManager injectionManager = applicationHandler.getInjectionManager();
ServiceLocator serviceLocator;
if (injectionManager instanceof ImmediateHk2InjectionManager)
{
  serviceLocator = ((ImmediateHk2InjectionManager) injectionManager).getServiceLocator();
}
else if (injectionManager instanceof DelayedHk2InjectionManager)
{
  serviceLocator = ((DelayedHk2InjectionManager) injectionManager).getServiceLocator();
}
else
{
  throw new IllegalStateException("Expecting an HK2 injection manager");
}

但是，ApplicationHandler 为空。有什么想法吗？

Answer 1

我们重构了我们的代码，使其在 org.eclipse.jetty.server.Server.start 之前不再依赖服务定位器。似乎有效。

检索应用程序处理程序时的 NPE

NPE when retrieving application handler

jersey

dropwizard

hk2