[GitHub] willard-kali opened a new issue #1092: Use RestTemplate to request another micro service in dispatcher occurred Thread blocked VertxException

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willard-kali opened a new issue #1092: Use RestTemplate to request another micro service in dispatcher occurred Thread blocked VertxException
URL: https://github.com/apache/servicecomb-java-chassis/issues/1092
 
 
   I followed by 
   https://github.com/huaweicse/cse-java-chassis-samples/tree/master/porter/gateway-service/src/main/java/com/huawei/cse/porter/gateway
   in UiDispatcher, I added like this.
   ```
   public class UiDispatcher extends AbstractEdgeDispatcher {
     ...
     private RestTemplate restTemplate = RestTemplateBuilder.create();
   
     @Override
     public int getOrder(){...}
   
     @Override
     public void init(Router router) {
     ...
     router.routeWithRegex(regex).failureHandler(this::onFailure).handler(this::onRequest);
     }
   
     protected void onRequest(RoutingContext context) {
       ...
       String sessionInfo =
                       restTemplate.getForObject(requestUrl, String.class);
       if (isValid(sessionInfo)) {...}
       ....
   
       HttpClientRequest clietRequest =
               httpClient.request(...);
       ....
     }
   
   ```
   
   After a few click, it occurred exception and blocked.
   error message:
   
   ```
   2019-02-12 17:25:07,309 [WARN] Thread Thread[transport-vert.x-eventloop-thread-2,5,main] has been blocked for 36189 ms, time limit is 2000 io.vertx.core.impl.BlockedThreadChecker$1.run(BlockedThreadChecker.java:52)
   io.vertx.core.VertxException: Thread blocked
   	at sun.misc.Unsafe.park(Native Method)
   	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
   	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
   	at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
   	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
   	at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
   	at org.apache.servicecomb.core.provider.consumer.SyncResponseExecutor.waitResponse(SyncResponseExecutor.java:53)
   	at org.apache.servicecomb.core.provider.consumer.InvokerUtils.innerSyncInvoke(InvokerUtils.java:75)
   	at org.apache.servicecomb.provider.springmvc.reference.CseClientHttpRequest.doInvoke(CseClientHttpRequest.java:204)
   	at org.apache.servicecomb.provider.springmvc.reference.CseClientHttpRequest.invoke(CseClientHttpRequest.java:194)
   	at org.apache.servicecomb.provider.springmvc.reference.CseClientHttpRequest.execute(CseClientHttpRequest.java:146)
   	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:660)
   	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:621)
   	at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:295)
   	at org.apache.servicecomb.provider.springmvc.reference.RestTemplateWrapper.getForObject(RestTemplateWrapper.java:79)
           ...
   ```
   
   is there anything wrong in my code?
   

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