关于serviceComb中的swagger抛出NullPointerException

在使用serviceComb时, 如果抛出以下异常:

 org.apache.servicecomb.serviceregistry.consumer.MicroserviceVersions >> Failed to setInstances, appId=hoolink-development, microserviceName=factory-rpc.
 java.lang.NullPointerException: null
     at org.apache.servicecomb.swagger.SwaggerUtils.validateSwagger(SwaggerUtils.java:)
     at org.apache.servicecomb.core.definition.SchemaUtils.parseSwagger(SchemaUtils.java:)
     at org.apache.servicecomb.core.definition.schema.ConsumerSchemaFactory.loadSwagger(ConsumerSchemaFactory.java:)
     at org.apache.servicecomb.core.definition.schema.ConsumerSchemaFactory.createSchema(ConsumerSchemaFactory.java:)
     at org.apache.servicecomb.core.definition.schema.ConsumerSchemaFactory.createSchema(ConsumerSchemaFactory.java:)
     at org.apache.servicecomb.core.definition.schema.AbstractSchemaFactory.getOrCreateSchema(AbstractSchemaFactory.java:)
     at org.apache.servicecomb.core.definition.schema.ConsumerSchemaFactory.createConsumerSchema(ConsumerSchemaFactory.java:)
     at org.apache.servicecomb.core.definition.MicroserviceVersionMeta.<init>(MicroserviceVersionMeta.java:)
     at org.apache.servicecomb.core.definition.MicroserviceVersionMetaFactory.create(MicroserviceVersionMetaFactory.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceVersions.lambda$setInstances$(MicroserviceVersions.java:)
     at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:)
     at org.apache.servicecomb.foundation.common.concurrent.ConcurrentHashMapEx.computeIfAbsent(ConcurrentHashMapEx.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceVersions.setInstances(MicroserviceVersions.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceVersions.safeSetInstances(MicroserviceVersions.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceVersions.pullInstances(MicroserviceVersions.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceVersions.submitPull(MicroserviceVersions.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceManager.lambda$getOrCreateMicroserviceVersions$(MicroserviceManager.java:)
     at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:)
     at org.apache.servicecomb.foundation.common.concurrent.ConcurrentHashMapEx.computeIfAbsent(ConcurrentHashMapEx.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceManager.getOrCreateMicroserviceVersions(MicroserviceManager.java:)
     at org.apache.servicecomb.serviceregistry.consumer.MicroserviceManager.getOrCreateMicroserviceVersionRule(MicroserviceManager.java:)
     at org.apache.servicecomb.serviceregistry.consumer.AppManager.getOrCreateMicroserviceVersionRule(AppManager.java:)
     at org.apache.servicecomb.edge.core.EdgeInvocation.findMicroserviceVersionMeta(EdgeInvocation.java:)
     at org.apache.servicecomb.edge.core.EdgeInvocation.edgeInvoke(EdgeInvocation.java:)
     at com.hoolink.gateway.build.dispatcher.ApiDispatcher.onRequest(ApiDispatcher.java:)
     at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:)
     at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:)
     at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:)
     at org.apache.servicecomb.transport.rest.vertx.RestBodyHandler$BHandler.doEnd(RestBodyHandler.java:)
     at org.apache.servicecomb.transport.rest.vertx.RestBodyHandler$BHandler.end(RestBodyHandler.java:)
     at org.apache.servicecomb.transport.rest.vertx.RestBodyHandler.lambda$handle$(RestBodyHandler.java:)
     at io.vertx.core.http.impl.HttpServerRequestImpl.handleEnd(HttpServerRequestImpl.java:)
     at io.vertx.core.http.impl.ServerConnection.handleLastHttpContent(ServerConnection.java:)
     at io.vertx.core.http.impl.ServerConnection.handleContent(ServerConnection.java:)
     at io.vertx.core.http.impl.ServerConnection.processMessage(ServerConnection.java:)
     at io.vertx.core.http.impl.ServerConnection.handleMessage(ServerConnection.java:)
     at io.vertx.core.http.impl.HttpServerImpl$ServerHandlerWithWebSockets.handleMessage(HttpServerImpl.java:)
     at io.vertx.core.http.impl.HttpServerImpl$ServerHandlerWithWebSockets.handleMessage(HttpServerImpl.java:)
     at io.vertx.core.net.impl.VertxHandler.lambda$channelRead$(VertxHandler.java:)
     at io.vertx.core.impl.ContextImpl.lambda$wrapTask$(ContextImpl.java:)
     at io.vertx.core.impl.ContextImpl.executeFromIO(ContextImpl.java:)
     at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:)
     at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
     at io.vertx.core.http.impl.Http1xOrH2CHandler.end(Http1xOrH2CHandler.java:)
     at io.vertx.core.http.impl.Http1xOrH2CHandler.channelRead(Http1xOrH2CHandler.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:)
     at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:)
     at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:)
     at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:)
     at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:)
     at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:)
     at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:)
     at io.netty.util.concurrent.SingleThreadEventExecutor$.run(SingleThreadEventExecutor.java:)
     at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:)
     at java.lang.Thread.run(Thread.java:)

此堆栈信息表示在factory-rpc中有空的controller

所谓空的controller指的是: 该controller中没有任何方法

　　当SwaggerUtils中的validateSwagger方法扫描到该controller,

　　然后通过swagger.getPaths()方法获取该controller中的函数

　　由于controller中没有方法, 所以paths为null, 再使用paths.values(), 就会出现空指针

   public static void validateSwagger(Swagger swagger) {
     Map<String, Path> paths = swagger.getPaths();
     for (Path path : paths.values()) {
       Operation operation = path.getPost();
       if (operation != null) {
         List<Parameter> parameters = operation.getParameters();
         for (Parameter parameter : parameters) {
           if (BodyParameter.class.isInstance(parameter)) {
             if (((BodyParameter) parameter).getSchema() == null) {
               throw new ServiceCombException("swagger validator: body parameter schema is empty.");
             }
           }
         }
       }
     }
   }