Error Error Calling Method On Npobject. Applet
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ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack error calling method on npobject firefox Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Accessing Java Applet non-static methods using Java up vote 1 down
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vote favorite I'm trying to access non-static methods in a java applet, through javascript. I access static methods using the Syntax AppletName.Packages.className.methodName(); and it works. If I try to access a non-static member/method via JavaScript, I get an error "Error calling method on NPObject", but nothing on the Java Console. Is there a way to access non-static applet methods from Javascript? java javascript applet non-static japplet share|improve this question uncaught error error calling method on npobject asked Jun 27 '11 at 13:58 Anirudh Ramanathan 32k1177120 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted You need to instantiate a java object, then you can call your methods. var myClass = new AppletName.Packages.className(); myClass.methodName(); From here. share|improve this answer answered Jun 27 '11 at 14:19 Ravan 4,96111126 add a comment| up vote 0 down vote See Call a Java method from Javascript. share|improve this answer answered Jun 27 '11 at 14:27 Andrew Thompson 137k19130250 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged java javascript applet non-static japplet or ask your own question. asked 5 years ago viewed 2450 times active 5 years ago Related 68calling non-static method in static method in Java1Java - Applet simply not displaying?0Java applet permission denied, security exception1Converting a Java Application into an Applet0Returning a dragged applet to the browser window with Java
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more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error calling method on NPObject when calling Java Applet Method from GWT Client code up vote 2 down vote favorite 1 I receive this error http://stackoverflow.com/questions/6494011/accessing-java-applet-non-static-methods-using-java when calling a Java Applet method from GWT JavaScript client code. The really strange thing is, this error only occurs when I create a certain object in the said applet method. Specifically, I have a class I created in the GWT "shared" folder, which serializes a class into a JSON string from an instance of this class within the client javascript. The Java applet also instanciates this class in java space, within the said method. When http://stackoverflow.com/questions/4458581/error-calling-method-on-npobject-when-calling-java-applet-method-from-gwt-client I don't attempt to instanciate this class within the applet method, it runs and returns no problem. Shouldn't the java instanciation be totally independant of GWT? Also, I wonder why i'm not getting a stack trace in my java console if this exception is occurring within java. Not sure if this is relevant, but I'm using the GWTAI project for Applet->JavaScript callbacks TIA for any responses, Phaedrus 02:40:22.848 [ERROR] [u] Uncaught exception escaped com.google.gwt.core.client.JavaScriptException: (Error): Error calling method on NPObject. stack: Error: Error calling method on NPObject. at [object Object]. (unknown source) at __gwt_jsInvoke (http://127.0.0.1:8888/u/hosted.html?u:76:35) java javascript gwt share|improve this question asked Dec 16 '10 at 8:03 Phaedrus 314515 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote I don't know if you've come to a solution on that one but bear in mind that GWT plugin in Chrome returns that kind of errors running the debug mode IF the object you're trying to deserialize/"javascript-ify" is too big. Apparently it has to do with some kind of stack size somehow... I've noticed that it works great on Safari for mac and of course when code is compiled... how annoying! I'm testing everything on a mac safari now since it's the only webkit-based plugin we have at the moment. Hope that helps and good luck! share|improve this answer answered Mar
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company http://stackoverflow.com/questions/826669/trouble-calling-an-applet-method-from-page Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Trouble calling an applet method from page up vote 1 down vote favorite I know it's not optimal, but I have error calling to work with it, a page making calls to the applet. My problem is, when I do so, I recieve a rather cryptic error message: "uncaught exception: Error calling method on NPObject! [plugin exception: java.lang.reflect.InvocationTargetException]." Can anyone decode this? Even multiple possibilities would be better than the junk I came up with. The basic call to the applet is from a javascript call: document.getElementById('my_applet').passData("pass some data", someOtherData); As you can see, the passData method error calling method is the exposed method I am trying to use. The applet itself works fine on the page, it's just when I try to call this, it doesn't do anything except throw that error. If I ask the person working on the applet (it's not my portion) is it possible for them to add constructive error throwing or am I not even at the point of connecting to the applet yet? java javascript gwt applet share|improve this question asked May 5 '09 at 20:00 Organiccat 2,914134282 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted InvocationTargetException indicates that the underlying method in your applet threw an exception. The Javascript to Java "boundary" uses reflection, so exceptions thrown by the Java code are wrapped like this. (This makes it possible to distinguish them from exceptions thrown before you got into your Java code. For example, if you tried to call a non-existant method.) You can get the original exception by catching the InvocationTargetException and then calling its getTargetException() or getCause() method (they both do exactly the same thing). share|improve this answer answered May 5 '09 at 20:24 Laurence Gonsalves 77k15145203 Thanks, that's definitely going to help out. I'll leave the question open in case I get any more hits, but I'll check bac