title: Web service exception: " An exception or error occurred in the container during the request processing java.lang.Exception: Host is not set"
body: <p>I have a web method which gets some name and returns its required input type(BOM, AML, BOM and AML or any other name) by reading a class file(maven plugin file). While trying to do this, i am getting below exception.</p>
  
  <pre><code>[2017-08-02T17:14:33.902+0800] [Payara 4.1] [SEVERE] [AS-WEB-CORE-00037] [javax.enterprise.web.core] [tid: _ThreadID=47 _ThreadName=http-thread-pool::http-listener-1(1)] [timeMillis: 1501665273902] [levelValue: 1000] [[
    An exception or error occurred in the container during the request processing
  java.lang.Exception: Host is not set
      at org.glassfish.grizzly.http.server.util.Mapper.map(Mapper.java:902)
      at org.apache.catalina.connector.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:496)
      at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:309)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238)
      at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:466)
      at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:169)
      at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
      at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
      at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
      at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
      at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
      at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539)
      at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
      at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
      at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
      at java.lang.Thread.run(Thread.java:722)
  ]]
  </code></pre>
  
  <p>Can you help me to solve this?</p>