I just finished the openlapi implementation on n900. there is 3 files in the tar archive. Here is my set up of how to run in n900.
openlapi.jar -> put in /opt/java
openlapi-jsr179.jar -> put in /opt/java
libgpsJNI.so -> put in /usr/lib (you need to put in this folder)

if you run the next lines you will have midlets using the location api

CLASSPATH=/opt/java/microemulator-3/microemulator.jar
CLASSPATH=$CLASSPATH:/opt/java/openlapi.jar
CLASSPATH=$CLASSPATH:/opt/java/openlapi-jsr179.jar
export CLASSPATH
java org.microemu.app.Main

I get the trekbuddy (http://www.trekbuddy.net/) working, but unfortunately I couldn't get google maps used the location. I will set up a garage project and upload the source files later. Please check it out and report if it is working for you too.