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Jini Packages

A typical Jini package error looks like this:

 Exception in thread "main" java.lang.NoClassDefFoundError:      net/jini/discovery/DiscoveryListener 

The Jini class files are all in jar files. The Jini distribution puts them in a lib subdirectory when they are unpacked. There are a whole bunch of these jar files:

 jini-core.jar            mahalo-dl.jar    sun-util.jar jini-examples-dl.jar     mahalo.jar       tools.jar jini-examples.jar        reggie-dl.jar    reggie.jar jini-ext.jar 

The jini-core.jar jar file contains the major packages of Jini:

 net.jini.core                 net.jini.core.discovery net.jini.core.entry           net.jini.core.event net.jini.core.lease           net.jini.core.lookup net.jini.core.transaction 

If the Java compiler or runtime can't find a class in one of these packages, then you need to make sure that the jini-core.jar file is in your CLASSPATH .

The jar file jini-ext.jar contains a set of packages that are not in the core, but are still heavily used:

 net.jini.admin      net.jini.discovery net.jini.entry      net.jini.lease net.jini.lookup     net.jini.lookup.entry net.jini.space 

If the Java compiler or runtime can't find a class in one of these packages, then you need to make sure that the jini-ext.jar file is in your CLASSPATH .

The sun-util.jar jar file contains the packages from the com.sun.jini hierarchy. These contain a number of "convenience" classes that are not essential but can be useful. These are less frequently used.

A compile or run of a Jini application will typically have an environment set something like this:

 JINI_HOME=wherever_Jini_home_is CLASSPATH=.:$JINI_HOME/lib/jini-core.jar:$JINI_HOME/lib/jini-ext.jar