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我正在尝试创建一个操作,其中服务器需要通过 GWTP 操作将对象的数组列表通过线路响应到客户端。

类别类

package com.business.share;

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.Id;

public class Category implements Serializable{
    Long id;
    protected String name;
    protected String description;
    protected boolean status;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return description;
    }

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

    public boolean getStatus() {
        return status;
    }

    public void setStatus(boolean status) {
        this.status = status;
    }
}

GetCategories 类

package com.business.client.action;

import java.util.ArrayList;
import com.gwtplatform.dispatch.shared.ActionImpl;
import com.business.client.action.GetCategoriesResult;
import com.business.share.Category;

public class GetCategories extends ActionImpl<GetCategoriesResult> {
    private ArrayList<Category> categories;
    @SuppressWarnings("unused")
    public GetCategories() {
        // For serialization only
    }

    public GetCategories(ArrayList<Category> categories) {
        this.categories = categories;
    }

    public ArrayList<Category> getCategories() {
        return categories;
    }
}

GetCategoriesResult 类

package com.business.client.action;

import java.util.ArrayList;
import com.gwtplatform.dispatch.shared.Result;
import com.business.share.Category;
public class GetCategoriesResult implements Result {
    private ArrayList<Category> categories;
    @SuppressWarnings("unused")
    private GetCategoriesResult() {
        // For serialization only
    }

    public GetCategoriesResult(ArrayList<Category> categories) {
        this.categories = categories;
    }

    public ArrayList<Category> getCategories() {
    return categories;
    }
}

GetCategoriesActionHandler 类

package com.business.server.handler;

import java.util.ArrayList;
import com.gwtplatform.dispatch.server.actionhandler.ActionHandler;
import com.business.client.action.GetCategories;
import com.business.client.action.GetCategoriesResult;
import com.business.share.Category;
import com.google.inject.Inject;
import com.googlecode.objectify.Objectify;
import com.googlecode.objectify.ObjectifyService;
import com.googlecode.objectify.Query;
import com.gwtplatform.dispatch.server.ExecutionContext;
import com.gwtplatform.dispatch.shared.ActionException;

public class GetCategoriesActionHandler implements
    ActionHandler<GetCategories, GetCategoriesResult> {

    @Inject
    public GetCategoriesActionHandler() {
    }

    @Override
    public GetCategoriesResult execute(GetCategories action,
        ExecutionContext context) throws ActionException {

        ArrayList<Category> categories = new ArrayList<Category>();

        // dummy data    
        Category cat1 = new Category();
        cat1.setName("cat1");
        cat1.setDescription("cat1 desc");
        cat1.setStatus(true);   
        Category cat2 = new Category();
        cat1.setName("cat2");
        cat1.setDescription("cat2 desc");
        cat1.setStatus(false);  
        categories.add(cat1);
        categories.add(cat2);   
        return new GetCategoriesResult(categories);
    }

    @Override
    public void undo(GetCategories action, GetCategoriesResult result,
        ExecutionContext context) throws ActionException {
    }

    @Override
    public Class<GetCategories> getActionType() {
        return GetCategories.class;
    }
}

这是 CategoryPresenter 中的一段代码,它将异步发送到服务器。

@Override
protected void onReset() {
    super.onReset();
    GetCategories getCategoriesAction = new GetCategories();
    dispatchAsync.execute(getCategoriesAction, getCategoriesCallback);
}

private final AsyncCallback<GetCategoriesResult> getCategoriesCallback = 
    new AsyncCallback<GetCategoriesResult>() {

    @Override
    public void onFailure(Throwable caught) {
    }

    @Override
    public void onSuccess(GetCategoriesResult result) {
        getView().getCategoryListBox().clear();
        ArrayList<Category> categories = result.getCategories();
        for(Category category : categories)  {
            getView().getCategoryListBox().addItem(category.getName());
        }
    }
};

我不知道这段代码有什么问题,但是 GWT 编译器总是给出这样的错误。

编译模块 com.business.Business 验证新编译的单元 在第一次通过时忽略了 3 个编译错误的单元。编译时使用 -strict 或将 -logLevel 设置为 TRACE 或 DEBUG 以查看所有错误。查找入口点类 [错误] 'file:/.blah..blah..blah../businessapp/src/com/business/client/presenter/CategoryPresenter.java' 中的错误 [错误] 第 75 行:没有源代码可用于 com.business.share.Category 类型;你忘了继承一个必需的模块吗?[错误] 'file:/.blah..blah..blah../businessapp/src/com/business/client/action/GetCategoriesResult.java' 中的错误 [错误] 第 11 行:没有可用于类型 com 的源代码.business.share.类别;你忘了继承一个必需的模块吗?[错误] 找不到类型“com.business.client.Business” [错误] 提示:以前的编译器错误可能导致此类型不可用 [错误] 提示:检查模块的继承链;它可能没有继承所需的模块,或者模块可能没有正确添加其源路径条目

在此错误消息之后,这意味着未找到 com.business.share.Category,但该文件已物理存储在该包中。我不明白为什么 GWT 找不到它。我注意到我在任何地方调用 Category 类,它总是会带来这个错误。有人知道发生了什么吗?

[编辑] 问题解决了。在我的 Business.gwt.xml 中,我有

    <source path='shared'/>

但是我的共享包是 com.business.share(没有 d)我只是将包名称从共享重命名为共享。

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1 回答 1

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尝试向Category该类添加一个空的构造函数。

于 2012-09-28T05:49:42.490 回答