JAXB XMLAdapter 方法不抛出异常 [英] JAXB XMLAdapter method does not throws Exception

问题描述

我正在使用 JAXB XMLadapter 来编组和解组布尔值.C# 应用程序也将访问应用程序的 XML 文件.我们必须验证这个 XML 文件，这是使用 XSD 完成的.C# 应用程序为布尔节点写入True"值.但是我们的 XSD 确实会验证相同的内容，因为它只允许真/假"或1/0".因此，我们在 XSD 中保留了布尔值的字符串，并且该字符串将由 XMLAdapter 验证以在我们这边进行编组和解组.XML 适配器如下:

I am using JAXB XMLadapter to marshal and unmarshal Boolean values. The application's XML file will be accessed by C# application also. We have to validate this XML file and this is done using XSD. C# application writes "True" value for Boolean nodes. But the same does get validated by our XSD as it only allows "true/false" or "1/0". So we have kept String for boolean values in XSD and that string will be validated by XMLAdapter to marshal and unmarshal on our side. The XML Adapter is as follows:

public class BooleanAdapter extends XmlAdapter<String, Boolean> {

    @Override
    public Boolean unmarshal(String v) throws Exception {

        if(v.equalsIgnoreCase("true") || v.equals("1")) {
            return true;
        } else if(v.equalsIgnoreCase("false") || v.equals("0")) {
            return false;
        } else {
            throw new Exception("Boolean Value from XML File is Wrong.");
        }
    }

    @Override
    public String marshal(Boolean v) throws Exception {
        return v.toString();        
    }
}

上面的代码在正常情况下工作，但是当从 xml 文件中读取无效数据(例如:abcd"或")时，throw new Exception();"没有得到传播，解组过程继续读取下一个节点.我希望应用程序在抛出异常时立即停止.看来我的异常被吃掉了.非常感谢任何帮助.

The code above works in normal conditions, but when invalid data(eg: "abcd" or "") is read from xml file then the "throw new Exception();" is not getting propagated and the Unmarshal process moves on to read next node. I want the application to stop as soon as an exception is thrown. It seems my Exception is getting eaten away. Any help is much appreciated.

如何解决这个问题?

推荐答案

来自XMLAdapter#unmarshal(ValueType):

抛出:java.lang.Exception - 如果在转换过程中出现错误.调用者负责通过ValidationEventHandler向用户报告错误.

Throws: java.lang.Exception - if there's an error during the conversion. The caller is responsible for reporting the error to the user through ValidationEventHandler.

所以，是的 - 例外是 eaten 然后使用 ValidationEventHandler，不会被扔到栈顶.

So, yes - the exception is eaten and then reported using ValidationEventHandler, not thrown to the top of your stack.

检查您是否已经在使用任何(可能是自定义的)ValidationEventHandler 将您的异常分组，或使用 DefaultValidationEventHandler，像这样:

Check if you are already using any (custom, perhaps) ValidationEventHandler that groups your exceptions, or use DefaultValidationEventHandler, like this:

unmarshaller.setEventHandler(new DefaultValidationEventHandler());

它会在第一个错误时导致解组失败.

It will cause unmarshalling failure on first error.

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