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nginxjakarta-eepayara-micro

java.lang.Exception: Host is not set (running a JakartaEE app on Payara micro, behind nginx)

This error trace is polluting my logs and I can't find on SA or else what is causing it:

[2022-01-11T04:15:00.144+0100] [] [[1;91mSEVERE[0m] [AS-WEB-CORE-00037] [[1;94mjavax.enterprise.web.core[0m] [tid: _ThreadID=27428 _ThreadName=http-thread-pool::http-listener(331)] [timeMillis: 1641870900144] [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:865)
    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:520)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:217)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:182)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:156)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:218)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:95)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:260)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:177)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:109)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:88)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:53)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:524)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:89)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:94)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:33)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:114)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:569)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:549)
    at java.base/java.lang.Thread.run(Thread.java:829)
]]

This is for a JakartaEE app with JSF 2.3 (Faces) running on Payara micro 5.2021.2. If this is of any relevance, here are the parts of the nginx config that redirect the traffic to the app:

upstream payara {
    least_conn;

    server localhost:8080 max_fails=3 fail_timeout=5s;
    server localhost:8181 max_fails=3 fail_timeout=5s;
}

    location /jsf-app-1.0-SNAPSHOT/ {
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-Forwarded-Proto https;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_no_cache $cookie_nocache  $arg_nocache$arg_comment;
            proxy_no_cache $http_pragma     $http_authorization;
            proxy_cache_bypass $cookie_nocache $arg_nocache $arg_comment;
            proxy_cache_bypass $http_pragma $http_authorization;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host $host:$server_port;
            add_header Access-Control-Allow-Origin *;
            proxy_set_header Access-Control-Allow-Origin *;
            proxy_pass http://payara$request_uri;
    }
    
    location / {
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
        proxy_set_header X-Forwarded-Proto https;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        proxy_no_cache $cookie_nocache  $arg_nocache$arg_comment;
            proxy_no_cache $http_pragma     $http_authorization;
            proxy_cache_bypass $cookie_nocache $arg_nocache $arg_comment;
            proxy_cache_bypass $http_pragma $http_authorization;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host $host:$server_port;
            add_header Access-Control-Allow-Origin *;
            proxy_set_header Access-Control-Allow-Origin *;
            proxy_pass http://payara$request_uri$is_args$args;

   }
Solution

  • Looks like Grizzly is trying to obtain the hostname from the Host header in the request. Since HTTP 1.1 the Host header is required but if the Host header is set an empty name, Grizzly cannot obtain the name and throws an exception.

    The Host request header is set by the HTTP client. But even if the Host header exists but its value is empty due to some reason the exception will be thrown.

    Grizzly Code: the code that throws the Exception

    According to the Javadocs for Grizzly you can set the default hostname by calling the setDefaultHostName(String defaultHostName) method, but the instance of the Mapper in the HttpHanderChain instance is not exposed. The default value set in HttpHanderChain of the Mapper instance is set to "localhost".