問題描述

我正在將一個項目從 JAXB 1.0 遷移到 JAXB 2.1，但我遇到了數據類型映射問題.

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 綁定編譯器，并且我已成功配置全局綁定，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，我得到了返回 Boolean 的生成方法，而我想要 boolean.

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

這里是復雜類型:

<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>

生成的類如下所示:

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

問題在于，雖然裝箱可以工作，但如果提供的 XML 不包含 pricepoint_custom_fields_required 的值，則該類的布爾字段為 null，而不是 false.所以我在做這樣的事情時得到 NullPointerExceptions:

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());

因為它試圖將傳入的布爾值拆箱 - 除非它是空值.

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

我無法更改架構，也無法調整所有客戶端代碼來進行空值檢查.

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

我在 binding.xml 中設置了 optionalProperty 屬性，如下所示:

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

<globalBindings optionalProperty="primitive">

在規范中，它說:如果屬性的值是‘原始的’，它會像在 JAXB 1.0 中那樣綁定"

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

然而這顯然沒有發生.

我該如何解決這個問題?

How can I solve this problem?

更新:

這個問題現在在 jaxb 2.2.9 中得到修復: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

推薦答案

我厭倦了等待開發團隊的修復，所以我卷起袖子自己動手.

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

我將下面的代碼包括在內，以幫助那些同樣存在問題的人.

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

免責聲明:我的代碼可能不是解決問題的最佳方法，但它對我有用.

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

生成的代碼現在如下所示:

The generated code now looks like this:

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

并且修改如下:

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

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

在

types.addTo(prop);

插入以下代碼:

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"));
    }

這篇關于JAXB 編譯器將 xs:boolean 綁定到 Java 布爾包裝類，而不是布爾原始類型的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！