Mashups in EMML : Expressions for Mashups : Defining Custom XPath Functions : Add the Function to the Classpath for the Presto Server
Add the Function to the Classpath for the Presto Server
You must add custom XPath function classes to the Presto Server for any mashup scripts that uses this function.
To add the function to the classpath for the Presto Server, you copy either the compiled class file or a JAR containing the compiled class file for the function to one of these folders, respectively:
*The external configuration folder, if any, for the Presto Server. See Setting Up an External Presto Configuration Folder for more information.
Important:  
Deploying additional resources, such as custom XPath classes, to an external configuration folder simplifies future deployments or Presto Server clusters.
*web-apps-home/presto/WEB-INF/classes. This is the default location, but is not recommended as it complicates Presto Server deployments.
*web-apps-home/presto/WEB-INF/lib. This is the default location, but is not recommended as it complicates Presto Server deployments.
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