src/ioexception-could-not-find-class-for-resource.md

layout: default_md title: IOException - could not find class for resource title-class: page-title-activemq5 type: activemq5

FAQ > Errors > Exceptions > IOException - could not find class for resource

If you get an exception looking like this

Reason:  java.io.exception : could not find class for resource: META-INF/services/org/apache/activemq/transport/tcp

Cause

You are probably using the ActiveMQ source code without using the resources

Quick fix

Try one of these

use one of the distribution jars for ActiveMQ
use Maven to run your program
try adding activemq/src/conf to your classpath

Background

Then it means that the files in META-INF/services could not be found on the classpath. These files are used to support loose coupling on ActiveMQ with the transport protocols (e.g. to avoid a classpath dependency on JXTA) and to allow dynamic protocol enhancement without a change to the core.

So we're using the META-INF/services files as a way of coupling a protocol used in URL connections to a Java class name.