JAXB编译器将xs：boolean绑定到Java布尔包装类，而不是布尔基元类型 [英] JAXB compiler is binding xs:boolean to Java Boolean wrapper class, instead of boolean primitive type

问题描述

我正在将项目从JAXB 1.0迁移到JAXB 2.1，我遇到了数据类型映射问题。

I'm migrating a project from JAXB 1.0 to JAXB 2.1 and I'm having problems with the datatype mapping.

我正在使用Ant xjc 绑定编译器，我已成功配置全局绑定，以便（例如） xs：date 映射到 java.util.Calendar 。

I'm using the Ant xjc binding compiler, and I've successfully configured the global bindings such that (for example) xs:date maps to java.util.Calendar.

但是我得到的生成方法返回 Boolean ，而我想要 boolean 。

However I'm getting generated methods which return Boolean, whereas I want boolean.

以下是复杂类型：

<xs:element name="usage-auth-rate-charge">
    <xs:complexType>
        <xs:sequence>
            <xs:element name="service-id" type="xs:string"/>
            <xs:element name="pricepoint_custom_fields_required" type="xs:boolean" minOccurs="0"/>
        </xs:sequence>
    </xs:complexType>
</xs:element>

生成的类看起来像这样：

And the generated class looks like this:

public class UsageAuthRateCharge {
........
public Boolean isPricepointCustomFieldsRequired() {
    return pricepointCustomFieldsRequired;
}

问题是虽然装箱会起作用，但如果提供的XML没有包含 pricepoint_custom_fields_required 的值，类的布尔字段为空，而不是false。所以我得到的 NullPointerException异常的时候做这样的事情：

The problem is that although boxing will work, if the supplied XML doesn't contain a value for pricepoint_custom_fields_required, the class's Boolean field is null, instead of false. So I get NullPointerExceptions when doing something like this:

methodWhichTakesPrimitiveBooleanArg(myUsageAuthRateChargeInstance.isPricepointCustomFieldsRequired());

因为它试图取消传入的布尔值 - 除了它是空的。

because it tries to unbox the Boolean passed in - except it's null.

我无法更改架构，我无法调整所有客户端代码来进行空检查。

I can't change the schema, and I can't adjust all the client code to do the null checks.

我在 binding.xml 中设置了 optionalProperty 属性，如下所示：

I've set the optionalProperty attribute in my binding.xml as follows:

<globalBindings optionalProperty="primitive">

在规范中，它说：如果属性的值是原始的，它会绑定为在JAXB 1.0中做了

In the spec, it says: "If the attribute’s value is "primitive", it binds as it did in JAXB 1.0"

然而这显然没有发生。

我该如何解决这个问题？

How can I solve this problem?

更新：

现在修正了jaxb 2.2.9：
https://java.net/jira/browse/JAXB/fixforversion/16850

This is now fixed in jaxb 2.2.9: https://java.net/jira/browse/JAXB/fixforversion/16850

推荐答案

我厌倦了等待开发团队的修复，所以我卷起袖子自己做了。

I got bored of waiting for a fix from the dev team so I rolled up my sleeves and did it myself.

我包含以下代码，以帮助那些也是问题的人。

I'm including the code below to help people for whom this is also an issue.

免责声明：我的代码可能不是解决问题的最佳方法，但它对我有用。

Disclaimer: my code probably isn't the best way to solve the problem but it works for me.

生成的代码现在如下所示：

The generated code now looks like this:

public boolean isPricepointCustomFieldsRequired() {
    if (pricepointCustomFieldsRequired == null) {
        return false;
    } else {
        return pricepointCustomFieldsRequired;
    }
}

修改如下：

com.sun.tools.xjc.reader.xmlschema.bindinfo.BIProperty：createElementProperty，line~358

com.sun.tools.xjc.reader.xmlschema.bindinfo.BIProperty:createElementProperty, line ~358

行后

types.addTo(prop);

插入以下代码：

if (prop.isOptionalPrimitive() && getOptionalPropertyMode() == OptionalPropertyMode.PRIMITIVE &&
    !prop.getTypes().isEmpty() && "boolean".equals(prop.getTypes().get(0).getTypeName().getLocalPart()) )   {
        prop.defaultValue= CDefaultValue.create(CBuiltinLeafInfo.BOOLEAN, new XmlString("false"));
    }

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