Unexpected Annotatedclassnotfoundexception When Loading Metric Collector Class
(Doc ID 376530.1)
Last updated on OCTOBER 20, 2022
Applies to:
Oracle Containers for J2EE - Version 10.1.3.0.0 and laterInformation in this document applies to any platform.
Symptoms
You have implemented a custom metric collector for the Oracle Containers For J2EE (OC4J) component of
Oracle Application Server 10g version 10.1.3.0.0
You have:
- packaged the implementation of your custom metric in a JAR file, for example MyCustomDMSMetric.jar
- placed that JAR file in the "applib" directory of the OC4J instance where you will be using it
- added an appropriate <metric-collector> tag to the config/server.xml configuration file:
<metric-collector classname="my.package.MyMetricCollector"/>
You may have also tried adding the JAR file location as a "code-source" for a <shared-library> definition in sever.xml:
<shared-library name="my.custom.metric" version="1.0">
</shared-library>
and added an "import" for the shared library in the <imported-shared-libraries> section of system-application.xml:
<imported-shared-libraries>
<import-shared-library name="oracle.dms"/>
<import-shared-library name="oracle.jdbc"/>
</imported-shared-libraries>
However, at startup time you receive an AnnotatedClassNotFoundException exception, similar to the following:
oracle.classloader.util.AnnotatedClassNotFoundException:
Missing class: my.package.MyMetricCollector
Dependent class: com.evermind.server.OC4JMonitorThread
Loader: oc4j:10.1.3
Code-Source: /u01/app/oracle/mid1013a/j2ee/home/lib/oc4j-internal.jar
Configuration: <code-source> in META-INF/boot.xml in
u01/app/oracle/mid1013a/j2ee/home/oc4j.jar
This load was initiated at oc4j:10.1.3 using the Class.forName() method.
The missing class is available from the following locations:
1. Code-Source: /path/to/MyCustomDMSMetric.jar
(from <code-source> in /u01/app/oracle/mid1013a/j2ee/home/config/server.xml)
This code-source is available in loader my.custom.metric:1.0.
This shared-library can be made visible to the "oc4j" loader by modifying
the boot descriptor.Changes
It is possible that you encounter this issue while migrating an application from Oracle Application Server 10.1.2 to the 10.1.3.0.0 release.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |