[检索应用程序处理程序时为NPE

Question

使用Dropwizard 1.3.17，我们这样检索ServiceLocator：

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

当我们迁移到Dropwizard 2时，它变成了：

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null。有什么想法吗？

Answer 1

我们重构了代码，使其不依赖org.eclipse.jetty.server.Server.start之前的服务定位器。似乎正在工作。