Standalone Java Client with more than 15 concurrent remote EJB calls using UserTransaction hangs in JBoss EAP 7.1

Environment

• Red Hat JBoss Enterprise Application Platform (EAP)
  • 7.2
  • 7.1

Issue

• Standalone Java Client with more than 15 concurrent remote EJB calls using UserTransaction hangs in JBoss EAP 7.1

Resolution

In the standalone application add a META-INF/wildfly-config.xml and increase the xnio max-threads (which defaults to 16)

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <worker xmlns="urn:xnio:3.5">
      <pool-size max-threads="250"/>    
    </worker>
</configuration>

Related Solutions

How to get Remote EJB UserTransaction in JBoss EAP 7.1+

Root Cause

UserTransaction uses a thread from the xnio thread pool, having more than 15 concurrent threads making remote EJB calls and using UserTransaction will exhaust the available threads and hang.

It is caused by:
Content from issues.jboss.org is not included.JBEAP-16793 - Standalone EJB Client using Remote UserTransaction can hang if there are more than 15 concurrent client threads

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