Question

我正在尝试创建一个操作，其中服务器需要通过GWTP Action通过线路响应对象的数组列表。

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传递中忽略3个具有编译错误的单元。使用-strict或-logLevel进行编译设置为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：com.business.share.Category类型没有源代码;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：com.business.share.Category类型没有可用的源代码;你忘了继承一个必需的模块吗？ [错误]无法找到'com.business.client.Business'类型 [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：检查模块中的继承链;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

发出此错误消息后，表示找不到com.business.share.Category，但此文件已经物理存储在该包中。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，它总是带来这个错误。有人知道发生了什么事吗？

[编辑] 问题已经解决了。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share重命名为shared。

Answer 1

尝试将空构造函数添加到Category类。

如何通过GWTP操作通过线路传输对象的数组列表

1 个答案: