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Unable to Load Assets After Upgrade: Missing Custom Class Libraries (Doc ID 2610364.1)

Last updated on MAY 26, 2021

Applies to:

Oracle WebCenter Sites - Version and later
Information in this document applies to any platform.


When attempting to load an asset, the Contributor UI displays "ContentServer Error" in Form mode.

Additionally, if searching for assets then clicking on the asset from search results, a javascript popup displays the following error: 

An exception occurred on the server while executing UI/Data?Asset/AssetMetada: ClassNotFoundException: {custom class}. If problem persists please contact the system administrator.

The sites.log shows shows many classpath-related errors related to custom classes.  One such error could be:

[wcsites_server1] [ERROR] [] [oracle.wcsites.xcelerate.asset] [tid: 106] [userId: ] [APP: sites] [partition-name: DOMAIN] [tenant-name: GLOBAL] Error in ComplexAsset: {custom class}[[
com.openmarket.basic.interfaces.AssetException: {custom class}
at com.openmarket.gator.common.FilterManager.loadFilter(
at com.openmarket.gator.interfaces.FilterFactory.getFilterInstance(
at com.openmarket.gator.flexfilters.FlexFilterInstance.describeDerivedAttributes(



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