Document how to work on sensor java code locally

[#62056960]

Author: scytacki

developer-doc/java.md

@@ -13,6 +13,16 @@ project. The Lab framework pulls in the
 [distribution repository](https://github.com/concord-consortium/lab-sensor-applet-interface-dist)
 through a submodule. This distribution repository provides the built and signed jars.
 
+### Working with sensor applet Java code within local Lab build
+
+1.  Clone lab-sensor-applet-interace https://github.com/concord-consortium/lab-sensor-applet-interface
+2.  Build it (see the readme of that project)
+3.  delete submodule folder `lab/vendor/lab-sensor-applet-interface-dist`
+4.  create a symlink `ln -s lab-sensor-applet-interface/dist lab/vendor/lab-sensor-applet-interface-dist`
+
+Now everytime you rebuild the sensor applet jars or javascript, and then make is run on the Lab project
+you local Lab server should include the new jars and new javascript.
+
 ### Running the Classic Java Molecular Workbench and Energy2D as Applications
 
 After building the Java resources the Java applications Molecular Workbench and Energy2D can be