I tried to define interface for lightweight collections as blow, but it can't be compiled successfully. Any mistake here?
//...........................Interface........................................... @SingleJsoImpl(JsArrayExtImpl.class) public interface JsArrayExt<M>{ public void add(int addBefore, M model) ; ..... } //................................Implementation public class JsArrayExtImpl<M extends JavaScriptObject> extends JsArray<M> implements JsArrayExt<M> { protected JsArrayExtImpl() { } @Override public final native void add(int addBefore, M model) /*-{ this.splice(addBefore, 0, model); }-*/; } but got error: Exception in thread "Code server for gwttest from Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:13.0) Gecko/20100101 Firefox/13.0.1 on ...GWTTest.html?gwt.codesvr=127.0.0.1:9997 @ SR;E74|oFVbz;?F%" java.lang.NullPointerException at com.google.gwt.dev.shell.ModuleSpace.dispose(ModuleSpace.java:146) at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:215) at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:525) at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363) at java.lang.Thread.run(Thread.java:722)` -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.