我有两个微服务。一个包含REST控制器，它具有Get方法，该方法在发送到特定队列时接收消息。其他微服务只是将回复消息发送到同一队列，以便在访问REST API时可以在浏览器中看到已处理的消息
然而，在收到消息时获取NPE。 下面是完整的堆栈跟踪：
2018-05-19 15:46:13.409 INFO 30104 --- [nio-8097-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/unit] : Initializing Spring FrameworkServlet 'dispatcherServlet' 2018-05-19 15:46:13.409 INFO 30104 --- [nio-8097-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started 2018-05-19 15:46:13.443 INFO 30104 --- [nio-8097-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 34 ms 2018-05-19 15:46:13.533 INFO 30104 --- [nio-8097-exec-1] o.s.a.r.c.CachingConnectionFactory : Attempting to connect to: [35.154.27.134:5672] 2018-05-19 15:46:13.593 INFO 30104 --- [nio-8097-exec-1] o.s.a.r.c.CachingConnectionFactory : Created new connection: rabbitConnectionFactory#5b2b49d6:0/SimpleConnection@3e4f13fa [delegate=amqp://guest@35.154.27.134:5672/, localPort= 58742] 2018-05-19 15:46:18.681 ERROR 30104 --- [nio-8097-exec-1] o.a.c.c.C.[.[.[.[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [/unit] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException: null
at com.infy.ci.unitamqpservice.UnitAmqpRestController.getAggregatedDataForSectionOfNightlyBuild(UnitAmqpRestController.java:83) ~[classes!/:0.0.1-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_151]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_151]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_151]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_151]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.27.jar!/:8.5.27]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_151]
此外，当在Web浏览器中访问REST API时，在控制台上获取以下日志
2018-05-19 15：45：22.328 INFO 30023 --- [主要] o.s.j.e.a.AnnotationMBeanExporter：位于托管bean ＆＃39; rabbitConnectionFactory＆＃39;：使用JMX服务器注册为MBean [org.springframework.amqp.rabbit.connection：名称= rabbitConnectionFactory，类型= CachingConnectionFactory] 2018-05-19 15：45：22.423 INFO 30023 --- [主要] o.s.c.support.DefaultLifecycleProcessor：正在启动bean 2147483647 2018-05-19 15：45：22.445 INFO 30023 --- [cTaskExecutor-1] o.s.a.r.c.CachingConnectionFactory：试图连接到： [35.154.27.134:5672] 2018-05-19 15：45：22.471 INFO 30023 --- [cTaskExecutor-1] o.s.a.r.c.CachingConnectionFactory：已创建 新连接： rabbitConnectionFactory＃325fc787：0 / SimpleConnection @ 38a7acf7 [delegate = amqp：//guest@35.154.27.134：5672 /，localPort = 58736] 2018-05-19 15：45：22.875 INFO 30023 --- [主要] s.b.c.e.t.TomcatEmbeddedServletContainer：Tomcat在端口上启动： 8099（http）2018-05-19 15：45：22.902 INFO 30023 --- [主要] com.infy.ci.unitdbamqpservice.RPCServer：在7.517中启动了RPCServer 秒（JVM运行8.286）星期六5月19日15:45:23 UTC 2018警告： 在没有服务器身份验证的情况下建立SSL连接 不建议。根据MySQL 5.5.45 +，5.6.26 +和5.7.6+ 要求如果显式，则必须默认建立SSL连接 选项未设置。符合不使用的现有应用程序 SSL将verifyServerCertificate属性设置为＆＃39; false＆＃39;。你需要 通过设置useSSL = false或设置来显式禁用SSL useSSL = true并为服务器证书提供信任库 验证。 5月19日星期六15:46:13 UTC 2018年警告：建立SSL 不建议在没有服务器身份验证的情况下进行连接。 根据MySQL 5.5.45+，5.6.26+和5.7.6+要求SSL 如果显式选项不是，则必须默认建立连接 组。为了符合不使用SSL的现有应用程序 verifyServerCertificate属性设置为＆＃39; false＆＃39;。你需要要么 通过设置useSSL = false显式禁用SSL，或设置useSSL = true和 提供服务器证书验证的信任库。
这可能是NPE的原因吗？我已经在JDBC代码中包含了以下内容，但仍然没有运气。
prop.setProperty("useSSL", "false");
prop.setProperty("autoReconnect", "true");
这两项服务都在github上签到：
答案 0 :(得分：1)
return rabbitTemplate.convertSendAndReceive("myExchange", requestQueueName, message).toString();
您无条件地在回复时拨打toString()。
如果在收到回复之前超出模板的null，则回复将为replyTimeout（超时默认为5秒）。
在致电null之前，您必须先检查toString()结果。
只是将回复消息发送到同一个队列
您无法将回复发送到同一个队列 - 它必须转到请求中的replyTo标头。
如果您在服务器端使用@RabbitListener或MessageListenerAdapter，则会为您处理。
这与SSL
无关警告：建议不要在没有服务器身份验证的情况下建立SSL连接。根据MySQL 5.5.45 +，5.6.26 +和5.7.6+要求如果未设置显式选项，则必须默认建立SSL连接。
这个警告是关于MySQL的。
修改
我只是将你的应用程序破解到最低限度，它们对我来说很好......
@Controller
@Configuration
@PropertySource("classpath:/application.properties")
@RequestMapping("/unittestdata")
public class UnitAmqpRestController {
private final String requestQueueName = "rpc_queue1";
@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
return new PropertySourcesPlaceholderConfigurer();
}
private final Logger logger = LoggerFactory.getLogger(UnitAmqpRestController.class);
private final RabbitTemplate rabbitTemplate;
@Autowired
public UnitAmqpRestController(RabbitTemplate rabbitTemplate) {
this.rabbitTemplate = rabbitTemplate;
rabbitTemplate.setReplyTimeout(15_000L);
}
@RequestMapping(value = "/{projectid}/ut/aggregate",
method = RequestMethod.GET,
produces = MediaType.TEXT_HTML_VALUE)
public @ResponseBody String getAggregatedDataForSectionOfNightlyBuild(@PathVariable("projectid") int projectid,
@RequestParam("buildtype") String buildtype, @RequestParam("build") String build) throws Exception {
if (build.toLowerCase().equals("latest") && buildtype.equals("nightly")) {
String message = String.format("aggregate");
logger.info("Sending: " + message);
Object returned = rabbitTemplate.convertSendAndReceive("", requestQueueName, message);
logger.info("Reply: " + returned);
if (returned == null) {
throw new RuntimeException("failed to get a response");
}
return returned.toString();
}
else {
return null;
}
}
}
和
@Configuration
@SpringBootApplication
@PropertySource("classpath:/application.properties")
public class RPCServer {
private static final Logger logger = LoggerFactory.getLogger(RPCServer.class);
public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
SpringApplication.run(RPCServer.class, args);
}
private static final String RPC_QUEUE_NAME = "rpc_queue1";
@Bean
public Queue queue() {
return new Queue(RPC_QUEUE_NAME);
}
@Component
public static class RpcListener {
@RabbitListener(queues = RPC_QUEUE_NAME)
public String reply(String request) throws IOException, TimeoutException, ClassNotFoundException, SQLException {
logger.info(request);
return request.toUpperCase();
}
}
}
和
2018-05-20 12:46:00.298 INFO 13369 --- [nio-8097-exec-1] c.i.c.u.UnitAmqpRestController : Sending: aggregate
...
o.s.amqp.rabbit.core.RabbitTemplate : Publishing message on exchange [], routingKey = [rpc_queue1]
2018-05-20 12:46:00.554 DEBUG 13369 --- [nio-8097-exec-1] o.s.amqp.rabbit.core.RabbitTemplate : Reply: (Body:'AGGREGATE' MessageProperties [headers={}, timestamp=null, messageId=null, userId=null, receivedUserId=null, appId=null, clusterId=null, type=null, correlationId=null, correlationIdString=null, replyTo=null, contentType=text/plain, contentEncoding=UTF-8, contentLength=0, deliveryMode=null, receivedDeliveryMode=PERSISTENT, expiration=null, priority=0, redelivered=false, receivedExchange=, receivedRoutingKey=amq.rabbitmq.reply-to.g2dkABByYWJiaXRAbG9jYWxob3N0AAAHFAAAAAAC.3M1LyvOdR9dHQehSV4l67A==, receivedDelay=null, deliveryTag=1, messageCount=null, consumerTag=null, consumerQueue=null])
2018-05-20 12:46:00.561 INFO 13369 --- [nio-8097-exec-1] c.i.c.u.UnitAmqpRestController : Reply: AGGREGATE