Question

Okay, so I created a JavaScript file called test.js which contains the following code:

print("It works!");

I compiled it using the Rhino JavaScript Compiler without any errors. Then I created a new file called foo.js which contains this code:

var test = require("./test.class");

Now when I run foo.js in Ringo in throws the following exception and stack trace:

Uncaught exception:
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.ringojs.tools.launcher.Main.run(Main.java:66)
    at org.ringojs.tools.launcher.Main.main(Main.java:45)
Caused by: java.lang.NoClassDefFoundError: /home/aaditmshah/test (wrong name: test)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
    at org.mozilla.javascript.DefiningClassLoader.defineClass(DefiningClassLoader.java:62)
    at org.ringojs.engine.ClassModuleLoader.load(ModuleLoader.java:126)
    at org.ringojs.engine.ReloadableScript.compileScript(ReloadableScript.java:153)
    at org.ringojs.engine.ReloadableScript.getScript(ReloadableScript.java:118)
    at org.ringojs.engine.ReloadableScript.exec(ReloadableScript.java:227)
    at org.ringojs.engine.ReloadableScript.load(ReloadableScript.java:215)
    at org.ringojs.engine.RingoWorker.loadModuleInternal(RingoWorker.java:283)
    at org.ringojs.engine.Require.call(Require.java:81)
    at org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:97)
    at org.mozilla.javascript.gen._home_aaditmshah_foo_js_3._c_script_0(/home/aaditmshah/foo.js:1)
    at org.mozilla.javascript.gen._home_aaditmshah_foo_js_3.call(/home/aaditmshah/foo.js)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:426)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3178)
    at org.mozilla.javascript.gen._home_aaditmshah_foo_js_3.call(/home/aaditmshah/foo.js)
    at org.mozilla.javascript.gen._home_aaditmshah_foo_js_3.exec(/home/aaditmshah/foo.js)
    at org.ringojs.engine.ReloadableScript.evaluate(ReloadableScript.java:186)
    at org.ringojs.engine.RingoWorker.evaluateScript(RingoWorker.java:315)
    at org.ringojs.engine.RhinoEngine.runScript(RhinoEngine.java:186)
    at org.ringojs.tools.RingoRunner.run(RingoRunner.java:152)
    ... 6 more
enter code here

I don’t know where am I going wrong. I have the latest versions of Ringo and Rhino 1.7R3. I added the current directory to my classpath by prepending the following line to foo.js:

addToClasspath(module.resolve("."));

However, it still generates the same error. I have no idea how to make this work. Any help will be greatly appreciated.

Answer 1

OK, I looked at the stack trace a little closer, and realized it’s finding the class file correctly, it just tries to load it from the wrong package (home.aaditmshah.test instead of just test). If the class file is in your module path, you can load it correctly with just the module (class) name. By default, the current directory isn’t in the module path, so you’ll have to add it first:

require.paths.push('.')
var test = require("test.class");