Does drip pick up classpath changes?

drip-classpath-test.sh

#!/bin/bash
#-----
# Test to see if drip picks up classpath changes.
#
# NB: For safety, create a new directory in which to execute this script!
#
# The drip utility (https://github.com/flatland/drip) is a way to launch a JVM
# quickly.  It works by keeping "a fresh JVM spun up in reserve with the
# correct classpath and other JVM options".
#
# The purpose of this script is to determine whether drip keeps track of a
# classpath change (perhaps by hashing).  This is done by creating an
# executable JAR file with a Class-Path option that references a second JAR
# file.  The second JAR file is then changed after drip is first executed.
#
# If drip is correctly detecting changes to the classpath, the output should
# be:
#  Thump, thump!
#  Bang, bang!
# If it is NOT correctly detecting classpath changes, the output should be:
#  Thump, thump!
#  Thump, thump!
#
# NOTE: drip currently fails the test (20 Nov 2012)
#-----

# Command to execute the JVM.  For comparison with straight java, use
#  JVMCMD="java"
JVMCMD="drip"

# Clean up anything from previous runs, and stop drip
rm -rf Greeble.jar Widget.jar src
mkdir -p ./src/org/greeble
mkdir -p ./src/org/widget
if [ -n "`drip ps`" ]
then
  drip kill
fi

# Stage 1: Create a Greeble.jar file to go on the classpath
cat > ./src/org/greeble/Thumper.java <<DELIM
package org.greeble;
public class Thumper {
  public static void thump() {
    System.out.println("Thump, thump!");
  }
}
DELIM
javac ./src/org/greeble/Thumper.java
jar cf ./Greeble.jar -C ./src org/greeble/Thumper.class 

# Stage 2: Create a Widget.jar executable file which has Greeble.jar in its
#  MANIFEST classpath
cat > ./src/org/widget/Main.java <<DELIM
package org.widget;
import org.greeble.Thumper;
public class Main {
  public static void main(String[] args) {
    Thumper.thump();
  }
}
DELIM
cat > ./src/org/widget/manifest.txt <<DELIM
Main-Class: org.widget.Main
Class-Path: Greeble.jar
DELIM
javac -cp Greeble.jar ./src/org/widget/Main.java
jar cmf ./src/org/widget/manifest.txt ./Widget.jar -C ./src org/widget/Main.class

# Stage 3: Execute the Widget.jar
$JVMCMD -jar Widget.jar

# Stage 4: Modify the Greeble.jar
cat > ./src/org/greeble/Thumper.java <<DELIM
package org.greeble;
public class Thumper {
  public static void thump() {
    System.out.println("Bang, bang!");
  }
}
DELIM
javac ./src/org/greeble/Thumper.java
jar cf ./Greeble.jar -C ./src org/greeble/Thumper.class 

# Stage 4: Re-execute Widget.jar to see if the changes were detected
$JVMCMD -jar Widget.jar

# Stop drip
if [ -n "`drip ps`" ]
then
  drip kill
fi