Dev : Extensions : Example Code : Calling Java from Javascript: Difference between revisions
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Revision as of 23:17, 26 October 2005
This page is currently notes of what I had to do to call Java from Javascript.
Here's an example from a blog: http://mozilla-firefox-extension-dev.blogspot.com/2004/11/calling-java-code-in-custom-jars-from.html
var cl = new Packages.java.net.URLClassLoader( [ new Packages.java.net.URL( 'http://foo.net/bar.jar') ] ); var aClass = Packages.java.lang.Class.forName("HelloWorld", true, cl); var aStaticMethod = aClass.getMethod("getGreeting", []); var greeting = aStaticMethod.invoke(null, []); alert(greeting);
In order to write to the file system, I had to add this to the javascript code: java.lang.System.setSecurityManager(null);
I could read a jar from the filesystem without a problem.
Calling showJavaConsole is very useful for debugging:
var jvm = Components.classes["@mozilla.org/oji/jvm-mgr;1"].getService(Components.interfaces.nsIJVMManager); jvm.showJavaConsole();
http://www.xulplanet.com/references/xpcomref/ifaces/nsIJVMManager.html#method_showJavaConsole