Skip to main content

Java com.sun.net.httpserver. HttpServer OutOfMemory Issue

We had to extract text out of documents that people were uploading to the site so we can index them. As this was going to be just a text extraction services I didnt wanted to go for some full blown tomcat server so wrote a quick http server using java

        this.httpServer = HttpServer.create(addr, 0);
        HttpContext context = this.httpServer.createContext("/", new DocumentProcessHandler());
        this.httpThreadPool = Executors.newFixedThreadPool(this.noOfThreads);
        this.httpServer.setExecutor(this.httpThreadPool);
        context.getFilters().add(new HttpParameterFilter());
        this.httpServer.start();
Not adding all code for brevity. 

After being live for 2-3 days the process started crashing and it was a regular pattern. I added -verbose:gc -XX:+HeapDumpOnOutOfMemoryError to the startup script and had a crash dump after 3 days. Using eclipse Memory Analyzer and using Histogram to look at the heap dump revealed that we had 90K HttpConnection objects. wow that looks for sure like a leak.



I tried everything from closing the exchange, responseBody as shown below but the connections would remain.

    class DocumentProcessHandler implements HttpHandler {
        @SuppressWarnings("unchecked")
        public void handle(HttpExchange exchange) throws IOException {
                PrintWriter responseBody = new PrintWriter(exchange.getResponseBody());

                try {
..........code removed for brevity of post....................
                } catch (Throwable t) {
                    logger.error(t);
                    throw new IOException(t);
                } finally {
                    responseBody.flush();
                    responseBody.close();
                    exchange.close();
                }
        }
    }

To prove my theory I send few http requests and did jmap -histo:live 16315 |grep http and keep on seeing the http connections would increase after every requests.
This is definitely a bug in the HttpServer code so use it only for demos and not for production use. I saw that lots of other people are also facing same issues and sun wont agree that its a bug so I am again moving back to tomcat :).


 http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6563368
http://forums.sun.com/thread.jspa?threadID=5380631
http://www.experts-exchange.com/Programming/Languages/Java/Q_24416845.html

Comments

  1. AnonymousJuly 8, 2010 at 1:05 PM

    I find out if the HTTP GET request has some extra bytes after the last 0xd 0xa in the HTTP header, it could lead to this leak as the HttpConnection is not added to "idleConnections" in sun.net.httpserver.ServerImpl

    ReplyDelete
  2. Drew NoakesFebruary 5, 2013 at 8:19 AM

    Another relevant bug report: http://bugs.sun.com/view_bug.do;?bug_id=6946825

    ReplyDelete

Post a Comment

Popular posts from this blog

RabbitMQ java clients for beginners

Here is a sample of a consumer and producer example for RabbitMQ. The steps are Download Erlang Download Rabbit MQ Server Download Rabbit MQ Java client jars Compile and run the below two class and you are done. This sample create a Durable Exchange, Queue and a Message. You will have to start the consumer first before you start the for the first time. For more information on AMQP, Exchanges, Queues, read this excellent tutorial http://blogs.digitar.com/jjww/2009/01/rabbits-and-warrens/ +++++++++++++++++RabbitMQProducer.java+++++++++++++++++++++++++++ import com.rabbitmq.client.Connection; import com.rabbitmq.client.Channel; import com.rabbitmq.client.*; public class RabbitMQProducer { public static void main(String []args) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setUsername("guest"); factory.setPassword("guest"); factory.setVirtualHost("/"); factory.setHost("127.0.0.1"); factory.se...
23 comments
Read more

Jersey streaming binary data

In the previous post I showed how you can post binary data to a jersey REST api. You can also use Jersey to serve files, although its better done by apache or nginx but sometimes you might want to serve thumbnails stored in a database out of a service and put varnish in front of the REST api to cache the thumbnails. This is just a demonstration of using jersey to serve binary data in streaming fashion. @Path("/download-service") public class DownaloadService extends SecureRestService { private static final AppLogger logger = AppLogger.getLogger(DownaloadService.class); @POST @Produces(MediaType.APPLICATION_OCTET_STREAM) public StreamingOutput getThumbnail( @FormParam("securityKey") final String securityKey, @FormParam("guid") final String guid) throws JSONException { return new StreamingOutput() { @Override public void write(OutputStream out) throws IOException { try { if (!isAuthorized(securityKey)) { response.sendErro...
12 comments
Read more

Spring 3.2 quartz 2.1 Jobs added with no trigger must be durable.

I am trying to enable HA on nodes and in that process I found that in a two test node setup a job that has a frequency of 10 sec was running into deadlock. So I tried upgrading from Quartz 1.8 to 2.1 by following the migration guide but I ran into an exception that says "Jobs added with no trigger must be durable.". After looking into spring and Quartz code I figured out that now Quartz is more strict and earlier the scheduler.addJob had a replace parameter which if passed to true would skip the durable check, in latest quartz this is fixed but spring hasnt caught up to this. So what do you do, well I jsut inherited the factory and set durability to true and use that public class DurableJobDetailFactoryBean extends JobDetailFactoryBean {     public DurableJobDetailFactoryBean() {         setDurability(true);     } } and used this instead of JobDetailFactoryBean in the spring bean definition     <bean i...
7 comments
Read more