Once you write your compound procedure source code, you compile and load it the same way you compile and load other procedures. First, you compile the Java source file into a class file including the VoltDB library in your Java classpath:

$ export CLASSPATH="$CLASSPATH:./:/opt/voltdb/voltdb/*"
$ javac -d ./obj src/devices/*.java

Then you package the class file with other stored procedures into a JAR file:

$ jar -cf devices.jar -C obj 

Finally you load the JAR file into the database using the sqlcmd LOAD CLASSES directive:

$ sqlcmd
1> LOAD CLASSES devices.jar;