How do I use jGrasp's libraries? - import

Question

I have a folder full of classes from a class I took. With a fresh install of jGrasp old projects that used to run fine are now full of "symbol not found" errors.
I still have the libraries, but I don't know how to import them. The way our class was set up, you didn't need import statements for anything that was in the library.
/* Turtle Drawing Program Lab 6, Part B */
/* Started by Celine Latulipe , modified by Bruce Long*/
public class Lab6PartB {
public static void main(String [] args)
{
/* Create the world */
World w = new World();
/* Create the turtle, call him Tom */
Turtle tom = new Turtle(w);
/* test the getDistance2() method */
int dist = tom.getDistance2();
System.out.println("This should print out the value 400. Value is: " + dist);
tom.moveTo(500, 400);
dist = tom.getDistance2();
System.out.println("This should print out the value 640. Value is: " + dist);
// TODO: Add a third test case that you make up
}
}
Error:
----jGRASP exec: java Lab6PartB
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: ModelDisplay
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: ModelDisplay
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.

Answer 1

You can add the directory containing the class files to the classpath, either at the OS level, or using "Settings" > "PATH / CLASSPATH" > "Workspace" in jGRASP.
Also, you could copy all the class files/directories to the folder containing your new project classes.