Can't import sun.org.mozilla.javascript.internal in NetBeans

Question

In my java program I make heavy use of Suns implmentation of the Rhino script engine. Very recently however, my JDK does not seem to automatically import the rt.jar file anymore when compiling.

Whats strange is that NetBeans reports 0 live errors, they only show up when doing a complete Clean & Build. This wasn't happening before when I was importing NativeArray, so I'm really confused on why it all of a sudden stopped working.

Specs:

• OS - Windows
• Java version - java version "1.6.0_20"
• Javac version - javac 1.6.0_20
• NetBeans version - 6.9

Check to see if it exists:

C:\Documents and Settings\LordQuackstar\Desktop\TestApp\src>javap sun.org.mozill
a.javascript.internal.WrappedException
Compiled from "WrappedException.java"
public class sun.org.mozilla.javascript.internal.WrappedException extends sun.or
g.mozilla.javascript.internal.EvaluatorException{
    static final long serialVersionUID;
    public sun.org.mozilla.javascript.internal.WrappedException(java.lang.Throwa
ble);
    public java.lang.Throwable getWrappedException();
    public java.lang.Object unwrap();
}

Ok it exists, so here's some test code:

package testapp;

import sun.org.mozilla.javascript.internal.WrappedException;

public class Main {
    public static void main(String[] args) {
        WrappedException e = new WrappedException(null);
    }
}

Netbeans output:

init:
deps-clean:
Updating property file: C:\Documents and Settings\LordQuackstar\Desktop\TestApp\build\built-clean.properties
Deleting directory C:\Documents and Settings\LordQuackstar\Desktop\TestApp\build
clean:
init:
deps-jar:
Created dir: C:\Documents and Settings\LordQuackstar\Desktop\TestApp\build
Updating property file: C:\Documents and Settings\LordQuackstar\Desktop\TestApp\build\built-jar.properties
Created dir: C:\Documents and Settings\LordQuackstar\Desktop\TestApp\build\classes
Created dir: C:\Documents and Settings\LordQuackstar\Desktop\TestApp\build\empty
Compiling 1 source file to C:\Documents and Settings\LordQuackstar\Desktop\TestApp\build\classes
C:\Documents and Settings\LordQuackstar\Desktop\TestApp\src\testapp\Main.java:8: package sun.org.mozilla.javascript.internal does not exist
import sun.org.mozilla.javascript.internal.WrappedException;
C:\Documents and Settings\LordQuackstar\Desktop\TestApp\src\testapp\Main.java:16: cannot find symbol
symbol  : class WrappedException
location: class testapp.Main
                WrappedException e = new WrappedException(null);
                ^
C:\Documents and Settings\LordQuackstar\Desktop\TestApp\src\testapp\Main.java:16: cannot find symbol
symbol  : class WrappedException
location: class testapp.Main
                WrappedException e = new WrappedException(null);
                                         ^
3 errors
C:\Documents and Settings\LordQuackstar\Desktop\TestApp\nbproject\build-impl.xml:528: The following error occurred while executing this line:
C:\Documents and Settings\LordQuackstar\Desktop\TestApp\nbproject\build-impl.xml:261: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 0 seconds)

Command line output:

C:\Documents and Settings\LordQuackstar\Desktop\TestApp\src\testapp>javac Main.java
Main.java:3: package sun.org.mozilla.javascript.internal does not exist
import sun.org.mozilla.javascript.internal.WrappedException;
                                          ^
Main.java:7: cannot find symbol
symbol  : class WrappedException
location: class testapp.Main
        WrappedException e = new WrappedException(null);
        ^
Main.java:7: cannot find symbol
symbol  : class WrappedException
location: class testapp.Main
        WrappedException e = new WrappedException(null);
                                 ^
3 errors

So what would cause this to fail all of a sudden? It was working just fine yesterday. I didn't change anything besides importing 2 more classes from the same package. None of my dependencies changed.

Will test in linux to see if the problem still exists.

Before you say it: No I'm not download rhino separatly, No I'm not changing IDEs,

Answer 1

There are two indications that you shouldn't use this class: sun and internal - these mean that this is some internal class that shouldn't be used by third parties. Because it can change or be removed in future releases - i.e. this is not part of an API. So - download Rhino separately.

If you are using the scripting API - use only the API classes/interfaces - i.e. javax.script

Answer 2

I agree w/ the above advice that you're better off not trying to use the sun internal packages.

This begs the question, how do you access JavaScript arrays w/out sun.org.mozilla.javascript.internal.NativeArray?

What worked for me is code as follows. This creates a Java array called vars based off a JavaScript array called vars.

int varsLength = ((Double)engine.eval("vars.length;")).intValue();
Object[] vars = new Object[varsLength];
for(int i=0; i<vars.length; i++){
    vars[i] = engine.eval("vars["+i+"];");
}

Answer 3

I had the same error. You must manually add rt.jar from JRE dir to project libraries. Only this solution seems work. You can also see a tutorial on this approach here by Rob Di Marco

Answer 4

This is an old question now, however when I had this problem, my solution was to do more work in the JavaScript environment and then to return a primitive type (String / Boolean) rather than an object.

Of course, this will not satisfy everyone and all requirements, but it may help in some cases.