GWTAI applet integration in GWT problem
- by andy
Hi everybody.
I'm working with gwtai to integrate a java applet into my gwt - project. Basic communication from my main application to the applet (such as invoking simple methods that return int or boolean values) works.
But the main reason why I need to integrate this applet is, that I need it to connect to another server and receive a answer and pass it to my gwt-application.
So there's one basic method in the applet:
public String SendAndReceive(String host, int sendPort, int receivePort, String query)
that connects to the server, receives an answer and returns this answer as a string.
When I now try to invoke this method like this:
applet.SendAndReceive("0.0.0.0", 9099, 2000, "show streams;");
I constantly run into following error (full error message at the end):
com.google.gwt.core.client.JavaScriptException: (String): Error calling method on NPObject! [plugin exception: java.security.AccessControlException: access denied (java.util.PropertyPermission * read,write)]
I couldn't find a solution (for gwtai is a quite uncommon topic), what I found out (and what the Exception let's one assume) is, that there's a security problem - maybe because I'm connecting to another server. I also read something about browser's Single Origin Policy, what would point in the same direction...up to now I have never worked with java applets.
So if someone has a solution or a hint I would be very thankful. If more code is helpful I can give.
Thanks,
Andy
the full error message:
21:03:49.864 [ERROR] [follovizergwt] Unable to load module entry point class follovizer.gwt.client.FolloVizerGWT (see associated exception for details)
com.google.gwt.core.client.JavaScriptException: (String): Error calling method on NPObject! [plugin exception: java.security.AccessControlException: access denied (java.util.PropertyPermission * read,write)].
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:195)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:264)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at follovizer.gwt.client.AnduINAppletImpl.SendAndReceive(AnduINAppletImpl.java)
at follovizer.gwt.client.FolloVizerGWT.createLayout(FolloVizerGWT.java:92)
at follovizer.gwt.client.FolloVizerGWT.onModuleLoad(FolloVizerGWT.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:369)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:185)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:380)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222)
at java.lang.Thread.run(Thread.java:619)
