Resolving class loading errors

If a class loading error occurs while the CaseEventEmitter.war file is running, configure library sharing in the WebSphere® Application Server administration console.

About this task

Errors of type java.lang.NoSuchMethodError indicate class loading errors. Such errors are usually caused by the classes of a JAR file inside the emitter conflicting with the classes used by the application server, as shown in the following code sample.

SRVE0283E: Exception caught while initializing context: java.lang.NoSuchMethodError: javax.json.Json.createPointer(Ljava/lang/String;)Ljavax/json/JsonPointer;
    at com.ibm.dba.oi.events.SimpleJsonPath.toJsonPointer(SimpleJsonPath.java:237)
    at com.ibm.dba.oi.events.BusinessEvent.get(BusinessEvent.java:92)
    at com.ibm.dba.oi.events.BusinessEvent.getAsString(BusinessEvent.java:123)
    at com.ibm.dba.oi.events.BusinessEvent.getAsStringNotNull(BusinessEvent.java:151)
    at com.ibm.dba.oi.events.icm.IcmEvent.getIcmSolutionName(IcmEvent.java:29)
    at com.ibm.oi.icm.event.emitter.IcmOiEmitter.recordLatestEvents(IcmOiEmitter.java:542)
    at com.ibm.oi.icm.event.emitter.IcmOiEmitter.run(IcmOiEmitter.java:296)
    ..

Procedure

Copy the conflicting JAR files to a directory.
For example, copy geronimo-json_1.1_spec-1.0.jar to C:\sharedLib.
Open the WebSphere Application Server administration console and select Environment > Shared Libraries.
Define the scope for the shared library by selecting the cell and node where your application is deployed.
Click New and enter a name and a class path in the page that displays.
For example, enter emitterLib as the name and C:\sharedLib as the class path.

Leave the Use an isolated class loader for this shared library check box cleared.
Open the deployed emitter application.
1. Browse to Applications > Application Types > Websphere Enterprise Applications.
2. Under References, click Shared Library References.
3. Select the check box for the emitter application and click Reference Shared Libraries.
4. In the page that opens, select the emitterLib class name that you created in step 4.
Restart the application for the changes to take effect.