Failed to instantiate the JavaCallout Class {0} - What does this mean and how can I fix it?,

[#1]

I am trying to use a Java Callout policy and wanted to test it and see it working with an extremely simple example before moving on to something more substantial. I was emulating the example of simply adding an extra query parameter on the request - example found here: https://github.com/apigee/api-platform-samples/blob/master/doc-samples/java-cookbook/java/src/com/ap...

My code:

package com.test;
import com.apigee.flow.execution.ExecutionContext;
import com.apigee.flow.execution.ExecutionResult;
import com.apigee.flow.execution.spi.Execution;
import com.apigee.flow.message.MessageContext;


public class JavaCalloutTest implements Execution{
    public ExecutionResult execute(MessageContext messageContext, ExecutionContext executionContext) {
	try {
	    int woeid = 0;

	    String jurisdiction = messageContext.getMessage().getQueryParam("jurisdiction").toUpperCase();


	    if(jurisdiction.equals("NH"))
		woeid=718345;
	    else if (jurisdiction.equals("MA"))
		woeid=721943;
	    else if (jurisdiction.equals("IN"))
		woeid=725746;
	    else {
		woeid=1;
	    }

	    messageContext.getRequestMessage().setQueryParam("w", woeid);
	    return ExecutionResult.SUCCESS;

	} catch (Exception e) {
	    return ExecutionResult.ABORT;
	}
    }
}

My Java Callout policy:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<JavaCallout async="false" continueOnError="false" enabled="true" name="Java-Callout">
    <DisplayName>Java Callout</DisplayName>
    <ResourceURL>java://JavaCalloutTest.jar</ResourceURL>
    <ClassName>com.test.JavaCalloutTest</ClassName>
</JavaCallout>

I've tried both with and without including expressions-1.0.0.jar and message-flow-1.0.0.jar jars in the proxy scripts.

Once I save the proxy and attempt to deploy I get the following error message:

"The revision is deployed, but traffic cannot flow. Failed to instantiate the JavaCallout Class com.test.JavaCalloutTest"

I'm not sure what I am doing wrong, but I think that I am missing something (maybe even something obvious)

My Solution: Do Not include expressions-1.0.0.jar or message-flow-1.0.0.jar in your jar for a Java Callout.