我正在尝试在GWT 2.6中运行我的应用程序。该项目是使用Elemental（library gwt-elemental）的Webcam示例。我使用的所有源代码，我找到了这个例子：https://code.google.com/p/elemental-getusermedia-demo/source/browse/#svn%2Ftrunk%2FElementalGetUserMediaDemo
当我运行我的应用时，会显示以下错误，但我无法找到该问题的位置。
消息：
08:08:57.756 [ERROR] [elementalgetusermediademo] Unable to load module entry point class com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo (see associated exception for details)
java.lang.RuntimeException: Deferred binding failed for 'com.google.gwt.user.client.impl.DOMImpl' (did you forget to inherit a required module?)
at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:53)
at com.google.gwt.core.shared.GWT.create(GWT.java:72)
at com.google.gwt.core.client.GWT.create(GWT.java:86)
at com.google.gwt.user.client.DOM.<clinit>(DOM.java:64)
at com.google.gwt.user.client.ui.FlowPanel.<init>(FlowPanel.java:34)
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo$ImagesStrip.<init>(ElementalGetUserMediaDemo.java:281)
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo.onModuleLoad(ElementalGetUserMediaDemo.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:411)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:526)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Thread.java:744)
Caused by: com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.
at com.google.gwt.dev.js.ast.JsVisitor.translateException(JsVisitor.java:483)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:470)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.js.JsToStringGenerationVisitor.visit(JsToStringGenerationVisitor.java:835)
at com.google.gwt.dev.js.ast.JsVars$JsVar.traverse(JsVars.java:61)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:468)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.js.JsToStringGenerationVisitor.visit(JsToStringGenerationVisitor.java:848)
at com.google.gwt.dev.js.ast.JsVars.traverse(JsVars.java:101)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:468)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.js.JsToStringGenerationVisitor.printJsBlock(JsToStringGenerationVisitor.java:907)
at com.google.gwt.dev.js.JsSourceGenerationVisitor.visit(JsSourceGenerationVisitor.java:59)
at com.google.gwt.dev.js.ast.JsBlock.traverse(JsBlock.java:47)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:468)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.shell.Jsni.generateJavaScriptForHostedMode(Jsni.java:253)
at com.google.gwt.dev.shell.Jsni.getJavaScriptForHostedMode(Jsni.java:241)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.createNativeMethods(ModuleSpaceOOPHM.java:52)
at com.google.gwt.dev.shell.CompilingClassLoader.injectJsniMethods(CompilingClassLoader.java:1379)
at com.google.gwt.dev.shell.CompilingClassLoader.findClass(CompilingClassLoader.java:1149)
at com.google.gwt.dev.shell.CompilingClassLoader.loadClass(CompilingClassLoader.java:1194)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at com.google.gwt.dev.shell.ModuleSpace.loadClassFromSourceName(ModuleSpace.java:670)
at com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate(ModuleSpace.java:473)
at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:49)
at com.google.gwt.core.shared.GWT.create(GWT.java:72)
at com.google.gwt.core.client.GWT.create(GWT.java:86)
at com.google.gwt.user.client.DOM.<clinit>(DOM.java:64)
at com.google.gwt.user.client.ui.FlowPanel.<init>(FlowPanel.java:34)
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo$ImagesStrip.<init>(ElementalGetUserMediaDemo.java:281)
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo.onModuleLoad(ElementalGetUserMediaDemo.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:411)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:526)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.IndexOutOfBoundsException: Index: 11, Size: 11
at java.util.ArrayList.rangeCheck(ArrayList.java:635)
at java.util.ArrayList.get(ArrayList.java:411)
at com.google.gwt.dev.shell.CompilingClassLoader$DispatchClassInfoOracle.getClassInfoByDispId(CompilingClassLoader.java:122)
at com.google.gwt.dev.shell.CompilingClassLoader.getClassInfoByDispId(CompilingClassLoader.java:1012)
at com.google.gwt.dev.shell.Jsni$JsSourceGenWithJsniIdentFixup.visit(Jsni.java:109)
at com.google.gwt.dev.js.ast.JsNameRef.traverse(JsNameRef.java:117)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:468)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.js.JsToStringGenerationVisitor.visit(JsToStringGenerationVisitor.java:835)
at com.google.gwt.dev.js.ast.JsVars$JsVar.traverse(JsVars.java:61)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:468)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.js.JsToStringGenerationVisitor.visit(JsToStringGenerationVisitor.java:848)
at com.google.gwt.dev.js.ast.JsVars.traverse(JsVars.java:101)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:468)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.js.JsToStringGenerationVisitor.printJsBlock(JsToStringGenerationVisitor.java:907)
at com.google.gwt.dev.js.JsSourceGenerationVisitor.visit(JsSourceGenerationVisitor.java:59)
at com.google.gwt.dev.js.ast.JsBlock.traverse(JsBlock.java:47)
at com.google.gwt.dev.js.ast.JsVisitor.doTraverse(JsVisitor.java:468)
at com.google.gwt.dev.js.ast.JsVisitor.doAccept(JsVisitor.java:445)
at com.google.gwt.dev.js.ast.JsVisitor.accept(JsVisitor.java:109)
at com.google.gwt.dev.shell.Jsni.generateJavaScriptForHostedMode(Jsni.java:253)
at com.google.gwt.dev.shell.Jsni.getJavaScriptForHostedMode(Jsni.java:241)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.createNativeMethods(ModuleSpaceOOPHM.java:52)
at com.google.gwt.dev.shell.CompilingClassLoader.injectJsniMethods(CompilingClassLoader.java:1379)
at com.google.gwt.dev.shell.CompilingClassLoader.findClass(CompilingClassLoader.java:1149)
at com.google.gwt.dev.shell.CompilingClassLoader.loadClass(CompilingClassLoader.java:1194)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at com.google.gwt.dev.shell.ModuleSpace.loadClassFromSourceName(ModuleSpace.java:670)
at com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate(ModuleSpace.java:473)
at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:49)
at com.google.gwt.core.shared.GWT.create(GWT.java:72)
at com.google.gwt.core.client.GWT.create(GWT.java:86)
at com.google.gwt.user.client.DOM.<clinit>(DOM.java:64)
at com.google.gwt.user.client.ui.FlowPanel.<init>(FlowPanel.java:34)
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo$ImagesStrip.<init>(ElementalGetUserMediaDemo.java:281)
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo.onModuleLoad(ElementalGetUserMediaDemo.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:411)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:526)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Thread.java:744)
我的入门点中有两个错误。
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo$ImagesStrip.<init>(ElementalGetUserMediaDemo.java:281)
at com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo.onModuleLoad(ElementalGetUserMediaDemo.java:65)
我的课程入学点：
package com.jooink.experiments.elementalgetusermedia.client;
import java.util.ArrayList;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.RootLayoutPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
import com.jooink.experiments.elementalgetusermedia.client.ElementalUtils.UserMediaCallback;
import elemental.client.Browser;
import elemental.events.Event;
import elemental.events.EventListener;
import elemental.html.CanvasElement;
import elemental.html.CanvasRenderingContext2D;
import elemental.html.VideoElement;
/**
* trivial sample of video/canvas & getUSerMedia
*/
public class ElementalGetUserMediaDemo implements EntryPoint {
//caching a canvas
private CanvasElement canvas = Browser.getDocument().createCanvasElement();
private ImagesStrip images;
private static final int tiles_w = 160;
private static final int tiles_h = 120;
@Override
public void onModuleLoad() {
final UserMediaHolder userMediaHolder = new UserMediaHolder();
int h = Window.getClientHeight();
int w = Window.getClientWidth();
int Nx = w/160;
int Ny = h/120;
images = new ImagesStrip(Nx*Ny, tiles_w + "px", tiles_h + "px");
RootLayoutPanel.get().add(images);
Button cam = new Button("Capture My Cam");
cam.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
if(!userMediaHolder.getUserMedia(userMediaCallback))
Window.alert("FAIL: your browser \""+ Window.Navigator.getUserAgent()+"\" does not support WebRTC's getUserMedia :(");
};
});
PopupPanel pp = new PopupPanel(false, true);
pp.add(cam);
pp.center();
pp.show();
}
private String makePicture(VideoElement videoElement, CanvasElement canvasElement) {
canvasElement.setWidth( videoElement.getVideoWidth());
canvasElement.setHeight( videoElement.getVideoHeight());
elemental.html.CanvasRenderingContext2D ctx = (CanvasRenderingContext2D) canvasElement.getContext("2d");
ctx.drawImage(videoElement, 0, 0);
return canvasElement.toDataURL("image/png");
}
private final UserMediaCallback userMediaCallback = new UserMediaCallback() {
public void onSuccess(String s) {
final PopupPanel popupPanel = new PopupPanel(false,true);
final ElementalVideoWidget video = new ElementalVideoWidget();
video.getVideoElement().setSrc(s);
video.getVideoElement().play();
popupPanel.setWidget(new HTML("Waiting for video to become available"));
popupPanel.center();
popupPanel.show();
//finalize the ui when the video is available
video.getVideoElement().addEventListener("loadedmetadata", new EventListener() {
@Override
public void handleEvent(Event evt) {
int w = video.getVideoElement().getVideoWidth();
int h = video.getVideoElement().getVideoHeight();
video.setSize(w+"px", h+"px");
final VerticalPanel vp = new VerticalPanel();
vp.add(video);
final HorizontalPanel hp = new HorizontalPanel();
Anchor click = new Anchor("make a picture");
click.addClickHandler( new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
String data = makePicture(video.getVideoElement(), canvas);
Anchor done = new Anchor("done");
done.getElement().getStyle().setColor("red");
done.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
popupPanel.hide();
}
});
vp.clear();
vp.add(new Image(data));
vp.add(hp);
hp.clear();
hp.add(done);
hp.setCellHorizontalAlignment(done, HasHorizontalAlignment.ALIGN_CENTER);
}
});
Anchor close = new Anchor("close");
close.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
popupPanel.hide();
}
});
Anchor timely_circular = new Anchor("stream (circular)");
timely_circular.addClickHandler( new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
final Timer timer = new Timer() {
@Override
public void run() {
String data = makePicture(video.getVideoElement(),canvas);
images.push_circular(data);
}
};
Anchor stop = new Anchor("stop");
stop.getElement().getStyle().setColor("red");
stop.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
timer.cancel();
popupPanel.hide();
}
});
hp.clear();
hp.add(stop);
hp.setCellHorizontalAlignment(stop, HasHorizontalAlignment.ALIGN_CENTER);
video.getVideoElement().setWidth(tiles_w);
video.getVideoElement().setHeight(tiles_h);
video.setSize(tiles_w + "px", tiles_h + "px");
popupPanel.center();
String data = makePicture(video.getVideoElement(),canvas);
images.push_circular(data);
timer.scheduleRepeating(250);
}
});
Anchor timely_moving = new Anchor("stream (moving)");
timely_moving.addClickHandler( new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
final Timer timer = new Timer() {
@Override
public void run() {
String data = makePicture(video.getVideoElement(),canvas);
images.push_shift(data);
}
};
Anchor stop = new Anchor("stop");
stop.getElement().getStyle().setColor("red");
stop.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
timer.cancel();
popupPanel.hide();
}
});
hp.clear();
hp.add(stop);
hp.setCellHorizontalAlignment(stop, HasHorizontalAlignment.ALIGN_CENTER);
video.getVideoElement().setWidth(tiles_w);
video.getVideoElement().setHeight(tiles_h);
video.setSize(tiles_w + "px", tiles_h + "px");
popupPanel.center();
String data = makePicture(video.getVideoElement(),canvas);
images.push_shift(data);
timer.scheduleRepeating(250);
}
});
hp.setWidth("100%");
hp.add(click);
hp.setCellHorizontalAlignment(click, HasHorizontalAlignment.ALIGN_LEFT);
hp.setCellWidth(click, "25%");
hp.add(timely_circular);
hp.setCellHorizontalAlignment(timely_circular, HasHorizontalAlignment.ALIGN_CENTER);
hp.setCellWidth(timely_circular, "25%");
hp.add(timely_moving);
hp.setCellHorizontalAlignment(timely_moving, HasHorizontalAlignment.ALIGN_CENTER);
hp.setCellWidth(timely_moving, "25%");
hp.add(close);
hp.setCellHorizontalAlignment(close, HasHorizontalAlignment.ALIGN_RIGHT);
hp.setCellWidth(close, "25%");
vp.add(hp);
popupPanel.setWidget(vp);
popupPanel.center();
}
});
}
public void onFail() {
Window.alert("FAIL: please let me access your camera");
}
};
public class ImagesStrip implements IsWidget {
private FlowPanel panel = new FlowPanel();
private ArrayList<Image> images = new ArrayList<Image>();
@Override
public Widget asWidget() {
return panel;
}
private int current = 0;
private int len;
private String width;
private String height;
public ImagesStrip(int len, String w, String h) {
this.len = len;
this.width = w;
this.height = h;
}
public void push_circular(String url) {
int pos = current%len;
if(images.size() <= pos) {
Image img = new Image();
img.setSize(width, height);
panel.add(img);
images.add(img);
}
images.get(pos).setUrl(url);
current++;
}
public void push_shift(String url) {
int pos = current%len;
if(images.size() <= pos) {
Image img = new Image();
img.setSize(width, height);
panel.add(img);
images.add(img);
}
if(current > len) {
Image img = images.get(pos);
panel.remove(img);
panel.add(img);
}
images.get(pos).setUrl(url);
current++;
}
}
}
有错误的行：
private FlowPanel panel = new FlowPanel();
和
images = new ImagesStrip(Nx*Ny, tiles_w + "px", tiles_h + "px");
我的gwt.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.6.0//EN"
"http://google-web-toolkit.googlecode.com/svn/tags/2.6.0/distro-source/core/src/gwt-module.dtd">
<module rename-to='elementalgetusermediademo'>
<!-- Inherit the core Web Toolkit stuff. -->
<inherits name='com.google.gwt.user.User'/>
<inherits name="elemental.Elemental"/>
<!-- Inherit the default GWT style sheet. You can change -->
<!-- the theme of your GWT application by uncommenting -->
<!-- any one of the following lines. -->
<inherits name='com.google.gwt.user.theme.clean.Clean'/>
<!-- <inherits name='com.google.gwt.user.theme.standard.Standard'/> -->
<!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> -->
<!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/> -->
<!-- Other module inherits -->
<!-- Specify the app entry point class. -->
<entry-point class='com.jooink.experiments.elementalgetusermedia.client.ElementalGetUserMediaDemo'/>
<!-- Specify the paths for translatable code -->
<source path='client'/>
</module>
我的论点：
-remoteUI "${gwt_remote_ui_server_port}:${unique_id}" -startupUrl ElementalGetUserMediaDemo.html -logLevel INFO -codeServerPort 9997 -port 8888 -war C:\GWTDev\ElementalGetUserMediaDemo\war com.jooink.experiments.elementalgetusermedia.ElementalGetUserMediaDemo
有人可以帮忙吗？谢谢你的关注。
答案 0 :(得分：0)
根本原因是
Caused by: java.lang.IndexOutOfBoundsException: Index: 11, Size: 11
你有
private ArrayList<Image> images = new ArrayList<Image>();
images.get(11)会导致上述错误。
检查代码中的所有images.get(pos)来电。在调用此方法之前进行大小检查，如下所示。
if(pos >= 0 && pos < images.size()){
images.get(pos);
}