| --- |
| layout: default_md |
| title: IOException - could not find class for resource |
| title-class: page-title-activemq5 |
| type: activemq5 |
| --- |
| |
| [FAQ](faq) > [Errors](errors) > [Exceptions](exceptions) > [IOException - could not find class for resource](ioexception-could-not-find-class-for-reDevelopers/source) |
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| 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 |
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| You are probably using the ActiveMQ source code without using the resources |
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| ### 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 |
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| 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. |
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| 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. |
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