Page Comparison

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In the OpenMRS core there are 2 pages where uncaught exceptions are handled, which are uncaughtException.jsp and errorHandler.jsp. When uncaught exception occurred one of those pages is displayed and Error Logging Module is notified by about it via extension points in those pages. To get exception and detail information about it is used an attribute of the request "javax.servlet.error.exception".

Error handling at the application level

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<error-page>
        <exception-type>java.lang.Exception</exception-type>
        <location>/uncaughtException</location>
</error-page>

<servlet-mapping>
        <servlet-name>openmrs</servlet-name>
        <url-pattern>/uncaughtException</url-pattern>
</servlet-mapping>
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To get those types of exceptions is used extension point in the uncaughtException.jsp. 

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<openmrs:extensionPoint pointId="org.openmrs.uncaughtException" type="html" />
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Error handling at the page level

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<%@ page errorPage="/errorhandler.jsp" %>
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To get those types of exceptions is used extension point in the errorHandler.jsp. 

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<openmrs:extensionPoint pointId="org.openmrs.errorHandler" type="html" />
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Ignored exceptions