Proxy on Apigee 1.5 is failing to query products

[theganyo]

An internal change in Apigee is causing the proxy integration jar to fail with a message similar to this:

Error Message:
{"fault":{"faultstring":"Failed to execute JavaCallout. Method 'com.apigee.kernel.service.ServiceLocator com.apigee.kernel.service.ServiceLocator.getInstance()' must be InterfaceMethodref constant","detail":{"errorcode":"steps.javacallout.ExecutionError"}}}

No fallback can be provided, we will need to update to select a new jar based on version.