Wicket:如何摆脱 WicketNotSerializableException? [英] Wicket: how to get rid of WicketNotSerializableException?

问题描述

好的，这是页面的代码

public class ViewDocument extends BasePage{

    private List<WeinSyncFileContent> transactions;
    ....

    public ViewDocument(){
        transactions = ....;
        ....
        listContainer.add(listView = new ListView<WeinSyncFileContent>("transactions", transactions){
           @Override
           public void populateItem(final ListItem<WeinSyncFileContent> item)
           {
              ....
           }
        });
    }
}

页面确实显示了，但出现错误:序列化对象类 kz.wein.wicket.pages.documents.ViewDocument 时出错

The page does get displayed but I get errors: Error serializing object class kz.wein.wicket.pages.documents.ViewDocument

它在抱怨交易字段:交易 [class=java.util.ArrayList$SubList] <----- 不可序列化的字段

and it's complaining about the transactions field: transactions [class=java.util.ArrayList$SubList] <----- field that is not serializable

我还要注意，我在列表中显示的对象最初是从库中获取的，并且不可序列化.Wicket 想要列表中的可序列化对象，因此为了处理它，我获取每个对象并使用这样的类使其可序列化

Also I want to note that objects I am displaying in the list are initially taken from library and are not serializable. Wicket wants serializable objects inside lists so to deal with it I take each object and make it serializable with class like this

public class WeinSyncFileContent extends SyncFileContent implements Serializable{

public WeinSyncFileContent(SyncFileContent obj){
    ... setting fields ...

}

}

所以最初我得到 SyncFileContent 对象(不可序列化)对于这些错误，我该怎么办?

so initially I get SyncFileContent objects (that are not serializable) What can I do about the errors?

推荐答案

您收到此错误是因为 Wicket 页面中的任何字段级变量都将被序列化.因此，最好不要将任何不可序列化的对象作为字段级变量.您的 WeinSyncFileContent 中必须有一个不可序列化的对象，这就是您收到此错误的原因.

You are getting this error because any field level variables in your Wicket pages will be serialized. So its probably a good idea to not have any non-serializable objects as field level variables. There must be an object in your WeinSyncFileContent that is not serializable which is why you are getting this error.

您可能希望改为使用模型来加载您的列表，例如:

You may want to instead use models to load your list so something like:

public ViewDocument(){

    ...

    listContainer.add(new ListView<WeinSyncFileContent>(
        "transactions", 
        new LoadableDetachableModel<List<WeinSyncFileContent>>() {
            protected List<WeinSyncFileContent> load() {
                return ...;
            }
        })
    {
       @Override
       public void populateItem(final ListItem<WeinSyncFileContent> item)
       {
          ....
       }
    });
}

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