要查看此问题的完整代码,请参阅此 github
https://github.com/mobiusinversion/web-application https://github.com/mobiusinversion/web-application
我还创建了这个 Jersey Jira
https://java.net/jira/browse/JERSEY-2851 https://java.net/jira/browse/JERSEY-2851
我正在研究一个ContainerRequestFilter
使用泽西岛 2.15。这是一个嵌入式 Jetty 应用程序,被隐藏在一个 jar 中。
在 Jetty 启动器(主类)中:
public static void main(String[] args) throws Exception {
ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
context.setContextPath("/");
Server jettyServer = new Server(10005);
jettyServer.setHandler(context);
ServletHolder jerseyServlet = context.addServlet(ServletContainer.class, "/*");
jerseyServlet.setInitOrder(0);
jerseyServlet.setInitParameter(ServerProperties.PROVIDER_PACKAGES, ServletConstants.COMPONENT_SCAN_ROOT);
try {
System.out.println("Starting Jetty");
jettyServer.start();
System.out.println("Jetty Started");
jettyServer.join();
} catch (Exception e) {
System.out.println("Could not start server");
e.printStackTrace();
} finally {
jettyServer.destroy();
}
}
我有一个通过提供商提供的过滤器
@Provider
public class ExampleProvider implements DynamicFeature {
@Override
public void configure(ResourceInfo resourceInfo, FeatureContext featureContext) {
ExampleFilter exampleFilter = new ExampleFilter();
featureContext.register(exampleFilter);
}
}
然后在过滤器中:
public class ExampleFilter implements ContainerRequestFilter {
private static final Logger logger = LoggerFactory.getLogger(ExampleFilter.class);
@Context
private HttpServletRequest servletRequest;
@Override
public void filter(ContainerRequestContext containerRequestContext) throws IOException {
logger.info("IP ADDRESS " + servletRequest.getRemoteAddr());
// ...
}
}
然而这会产生一个NullPointerException
:
Caused by: java.lang.NullPointerException: null
at com.example.filters.ExampleFilter.filter(ExampleFilter.java:29)
at org.glassfish.jersey.server.ContainerFilteringStage.apply(ContainerFilteringStage.java:131)
at org.glassfish.jersey.server.ContainerFilteringStage.apply(ContainerFilteringStage.java:67)
我做错了什么以及如何解决这个问题?
更新:包括 Jetty 和 Jersey 的 pom 条目
<properties>
<jersey.version>2.15</jersey.version>
<jetty.version>9.2.6.v20141205</jetty.version>
</properties>
<!-- Jersey -->
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>${jersey.version}</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>${jersey.version}</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>${jersey.version}</version>
<type>pom</type>
<scope>compile</scope>
</dependency>
<!-- Jetty -->
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-server</artifactId>
<version>${jetty.version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-servlet</artifactId>
<version>${jetty.version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-servlets</artifactId>
<version>${jetty.version}</version>
</dependency>