When compiling a Java application that uses ILOG Concert Technology, you need to inform the Java compiler where to find the file cplex.jar containing the ILOG CPLEX Concert Technology class library. To do this, you add the cplex.jar file to your classpath. This is most easily done by passing the command-line option

-classpath <path_to_cplex.jar> 

to the Java compiler javac. If you need to include other Java class libraries, you should add the corresponding jar files to the classpath as well. Ordinarily, you should also include the current directory (.) to be part of the Java classpath.

At execution time, the same classpath setting is needed. Additionally, since ILOG CPLEX is implemented via JNI, you need to instruct the Java Virtual Machine (JVM) where to find the shared library (or dynamic link library) containing the native code to be called from Java. You indicate this location with the command line option:

-Djava.library.path=<path_to_shared_library> 

to the java command. Note that, unlike the cplex.jar file, the shared library is system-dependent; thus the exact pathname of the location for the library to be used may differ depending on the platform you are using.