A walk through tunnel - Compiling tunnel
From Fs_wiki
To compile Tunnel you need the Java Development Kit (JDK).
If you have downloaded only the runtime (JRE), you will not be able
to compile the program.
Go to the "tunnelx" directory, just as when you wanted to run Tunnel. From there type the command,
javac src/*.java
This will compile all the java source files in the "src" subdirectory.
The output of the compilation is a set of java class files, ie, files with
extension "class", in the same directory. You need to move them in the
subdirectory "Tunnel" because the classes belong to the package named
"Tunnel" and Java searches for classes hierarchically in directories
according to the package naming scheme.
