1

我正在创建一个学校项目，我需要部署一个与本机 android 应用程序连接的应用程序，并且它们都在 Google App Engine Datastore 上共享相同的实体。我遵循了谷歌官方教程（https://developers.google.com/web-toolkit/doc/2.4/DevGuideRequestFactory）描述的所有说明，但不幸的是，我无法在开发模式下将任何实体存储在数据存储区中。我尝试了数周来正确配置 requestfactory，但没有成功。

以下是我的项目中我的请求工厂中最重要的类：（我根据谷歌教程在 xml 文件中添加了所有适当的标签）

这是我的实体之一：

import java.util.Calendar;
import java.util.Date;
import java.util.List;

import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

import unipiWeb.server.EMF;

import com.google.appengine.api.datastore.Blob;
import com.google.appengine.api.datastore.GeoPt;
import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;

@Entity
public class Store{
        
    @Id
    private Long id;
    private Date dueDate;
    private String email;
    private String name;
    private String address;
    private String description;
    private long userId;
    private String country;
    
    
    private GeoPt geopt;
    
    Blob image;

    public Store(){
        
    }
    
    public Store(String name, Blob image){
        this.name = name;
        this.image = image;
    }
    
    public Store(String name, Blob image, String country){
        this.name = name;
        this.image = image;
        this.country = country;
    }
    
    /*
     * Getters and Setters
     */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public Long getId() {
        return this.id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
        public Date getDueDate() {
        return dueDate;
    }

    public void setDueDate(Date dueDate) {
        this.dueDate = dueDate;
    }

    public String getEmail() {
        return this.email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public long getUserId() {
        return userId;
    }

    public void setUserId(long userId) {
        this.userId = userId;
    }

    public GeoPt getGeopt() {
        return geopt;
    }

    public void setGeopt(GeoPt geopt) {
        this.geopt = geopt;
    }

    public String getCountry(){
        return country;
    }
    
    public void setCountry(String country){
        this.country = country;
    }
    
    public Blob getImage(){
        return image;
    }
    
    public void setImage(Blob image){
        this.image = image;
    }

    public String toString(){
        StringBuilder builder = new StringBuilder();
        builder.append("Store [dueDate=");
        builder.append(dueDate);
        builder.append(", name=");
        builder.append(name);
        builder.append(", description=");
        builder.append(description);
        builder.append("]");
        return builder.toString();
        
    }
}

实体代理：

import java.util.Date;

import com.google.web.bindery.requestfactory.shared.EntityProxy;
import com.google.web.bindery.requestfactory.shared.ProxyForName;

@ProxyForName(value = "unipiWeb.server.entities.Store", locator = "unipiWeb.server.entities.StoreLocator")
public interface StoreProxy extends EntityProxy {

    Long getId();

    String getName();

    void setName(String name);

    Date getDueDate();

    void setDueDate(Date dueDate);

    String getEmail();

    void setEmail(String email);

    String getDescription();

    void setDescription(String description);

    String getAddress();

    void setAddress(String address);

    long getUserId();

    void setUserId(long userId);

    String getCountry();

    void setCountry(String country);

}

该实体的服务：

import java.util.List;

import unipiWeb.server.DataStore;
import unipiWeb.server.entities.Store;
import unipiWeb.annotation.ServiceMethod;

public class AppService {
    
    DataStore db = new DataStore();
    @ServiceMethod
    public Store createStore() {
        return db.update(new Store());
    }

    @ServiceMethod
    public Store readStore(Long id) {
        return db.find(id);
    }

    @ServiceMethod
    public Store updateStore(Store store) {
        store.setEmail(DataStore.getUserEmail());
        return db.update(store);
    }

    @ServiceMethod
    public void deleteStore(Store store) {
        db.delete(store.getId());
    }

    @ServiceMethod
    public List<Store> queryStores() {
        return db.findAll();
    }
    

}

实体定位器：

import com.google.web.bindery.requestfactory.shared.Locator;


public class StoreLocator extends Locator<Store, Void> {

    @Override
    public Store create(Class<? extends Store> clazz) {
        return new Store();
    }

    @Override
    public Store find(Class<? extends Store> clazz, Void id) {
        return create(clazz);
    }

    @Override
    public Class<Store> getDomainType() {
        return Store.class;
    }

    @Override
    public Void getId(Store domainObject) {
        return null;
    }

    @Override
    public Class<Void> getIdType() {
        return Void.class;
    }

    @Override
    public Object getVersion(Store domainObject) {
        return null;
    }

}

这是 RequestContext 子类：

import java.util.List;

import com.google.web.bindery.requestfactory.shared.Request;
import com.google.web.bindery.requestfactory.shared.RequestContext;
import com.google.web.bindery.requestfactory.shared.ServiceName;

@ServiceName(value = "unipiWeb.server.services.AppService", locator = "unipiWeb.server.services.AppServiceLocator")
public interface AppRequest extends RequestContext {
        
    Request<StoreProxy> createStore();
    
    Request<StoreProxy> readStore(Long id);
    
    Request<StoreProxy> updateStore(StoreProxy store);
        
    Request<Void> deleteStore(StoreProxy store);
    
    Request<List<StoreProxy>> queryStores();

}

和 requestfactory 子类：

import com.google.web.bindery.requestfactory.shared.RequestFactory;


public interface AppRequestFactory extends RequestFactory {
    
    AppRequest appRequest();

}

这是每次我尝试存储新实体时都会出现的错误。（项目调试完全没有错误）

17:23:53.411 [ERROR] [unipiweb] Uncaught exception escaped

com.google.gwt.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:129)
    at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:129)
    at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:116)
    at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:177)
    at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1351)
    at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1307)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: org/json/JSONException
    at com.google.web.bindery.autobean.shared.impl.StringQuoter.createSplittable(StringQuoter.java:58)
    at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.&lt;init&gt;(AbstractAutoBean.java:71)
    at unipiWeb.client.requestfactory.StoreProxyAutoBean_com_google_web_bindery_requestfactory_shared_impl_EntityProxyCategory_com_google_web_bindery_requestfactory_shared_impl_ValueProxyCategory_com_google_web_bindery_requestfactory_shared_impl_BaseProxyCategory.&lt;init&gt;(StoreProxyAutoBean_com_google_web_bindery_requestfactory_shared_impl_EntityProxyCategory_com_google_web_bindery_requestfactory_shared_impl_ValueProxyCategory_com_google_web_bindery_requestfactory_shared_impl_BaseProxyCategory.java:90)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.web.bindery.autobean.gwt.client.impl.JsniCreatorMap$.invoke$(JsniCreatorMap.java)
    at com.google.web.bindery.autobean.gwt.client.impl.JsniCreatorMap$.create$(JsniCreatorMap.java:46)
    at com.google.web.bindery.autobean.gwt.client.impl.AbstractAutoBeanFactory.create(AbstractAutoBeanFactory.java:38)
    at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext.createProxy(AbstractRequestContext.java:688)
    at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext.create(AbstractRequestContext.java:497)
    at unipiWeb.client.widgets.StoreWidget$4.onClick(StoreWidget.java:188)
    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:54)
    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:1)
    at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
    at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)
    at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
    at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:127)
    at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:129)
    at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:116)
    at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:177)
    at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1351)
    at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1307)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: null
    at com.google.gwt.dev.shell.CompilingClassLoader$MultiParentClassLoader.findClass(CompilingClassLoader.java:365)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.google.web.bindery.autobean.shared.impl.StringQuoter.createSplittable(StringQuoter.java:58)
    at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.&lt;init&gt;(AbstractAutoBean.java:71)
    at unipiWeb.client.requestfactory.StoreProxyAutoBean_com_google_web_bindery_requestfactory_shared_impl_EntityProxyCategory_com_google_web_bindery_requestfactory_shared_impl_ValueProxyCategory_com_google_web_bindery_requestfactory_shared_impl_BaseProxyCategory.&lt;init&gt;(StoreProxyAutoBean_com_google_web_bindery_requestfactory_shared_impl_EntityProxyCategory_com_google_web_bindery_requestfactory_shared_impl_ValueProxyCategory_com_google_web_bindery_requestfactory_shared_impl_BaseProxyCategory.java:90)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.web.bindery.autobean.gwt.client.impl.JsniCreatorMap$.invoke$(JsniCreatorMap.java)
    at com.google.web.bindery.autobean.gwt.client.impl.JsniCreatorMap$.create$(JsniCreatorMap.java:46)
    at com.google.web.bindery.autobean.gwt.client.impl.AbstractAutoBeanFactory.create(AbstractAutoBeanFactory.java:38)
    at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext.createProxy(AbstractRequestContext.java:688)
    at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext.create(AbstractRequestContext.java:497)
    at unipiWeb.client.widgets.StoreWidget$4.onClick(StoreWidget.java:188)
    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:54)
    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:1)
    at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
    at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)
    at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
    at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:127)
    at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:129)
    at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:116)
    at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:177)
    at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1351)
    at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1307)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Unknown Source)

欢迎任何指示或建议！！ 谢谢你！！！

4

1 回答 1

3

引起：java.lang.NoClassDefFoundError: org/json/JSONException

确保 org.json jar 在您的类路径（通常称为json.jar）上。您可以直接添加此 jar，或使用包含这些类的另一个 jar。您可以从 maven 作为 org.json:json:20090211 或从http://www.json.org/java/index.html获得它。

根据https://developers.google.com/web-toolkit/doc/2.4/DevGuideRequestFactory，requestfactory-server.jarjar 应该包含这些类，尽管其他用户报告了这个问题（参见https://groups.google.com上的讨论/d/topic/google-web-toolkit/76btyDIat7k/discussiongwt-servlet-deps.jar ）-如果另一个不起作用，他们建议您尝试使用jar。

于 2012-10-28T16:22:32.460 回答