MULE ESB : How to fix the error : org.glassfish.grizzly.nio.SelectorRunner: doSelect exception java.lang.OutOfMemoryError?

Question

I am using MULE ESB version 3.8.1 and exposing a synchronous SOAP Web service using HTTP and CXF component. The service is working fine for say 100 requests in a minute.

But when I am using SoapUI to perform LOAD testing and sending requests as follows: 12 threads, active for 300 seconds, and sending burst requests the load on ESB server is pretty high and I get the error :

org.glassfish.grizzly.nio.SelectorRunner: doSelect exception

java.lang.OutOfMemoryError: unable to create new native thread

My question is :

How can I configure mule ESB flows or tune the performance in mule ESB so that I can increase the performance to process 10 requests per second.

Answer 1

That is a problem with your operating system configuration. See the recommendations at https://support.mulesoft.com/s/article/OutOfMemoryError-unable-to-create-new-native-thread-How-to-prevent-it on how to troubleshoot.

Also 3.8.1 might have many bugs already fixed in later version a. As of today 3.9.2 is much more robust.