You need to install Java Runtime Environment, that is one requirement for running Jabaco.
But as far as i know if you had installed JDK already it supposed have JRE along with JDK directory.
this the Official statement from java site.
Do you want to run JavaTM programs, or do you want to develop Java
programs? If you want to run Java programs, but not develop them, download the
Java Runtime Environment, or JRETM.
If you want to develop applications for Java, download the Java Development
Kit, or JDKTM. The JDK includes the JRE, so you do not have to
download both separately.
Maybe there is a problem with your JDK installation? Are you using the JDK for Java application dev? if not you could just replace it with JRE you dont need JDK just to Run Jabaco.
download it from official java site:
http://www.oracle.com/technetwork/java/j…oad-432155.html