JSObject: Download it or available in JRE 1.6?

Question

Hello all,

This is a question from a JAVA noob.

I have eclipse open (JRE 1.6), I have copied this code into an eclipse class: http://bit.ly/WLntN

The line in question is this:

import netscape.javascript.JSObject;

Eclipse is complaining that the import can not be resolved. I read that in the docs that the Java Plug-In comes as standard and contains the above. I assumed I don't need any extra JAR files. Is this true?

Or do I need to download something to make use of JSObject?

Thanks all

Answer 1

Javascript is just one of the ScriptEngines in JDK1.6.

http://java.sun.com/developer/technicalArticles/J2SE/Desktop/scripting/ :

ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine jsEngine = mgr.getEngineByName("JavaScript");
try {
  jsEngine.eval("print('Hello, world!')");
} catch (ScriptException ex) {
  ex.printStackTrace();
}

Answer 2

Search for the plugin.jar normally located in your jre\lib folder. You will need to include that one explicitly in your eclipse project I guess

btw. don't forget to set the MAYSCRIPT attribute on your applet tag in order to explicitly enable java-js communication which normally is disabled by default for security reasons