枚举与模式不匹配:jaxb 或 xsd 有问题? [英] Enums don't match schema: problem with jaxb or xsd?
问题描述
我正在尝试使用 JAXB 解组 这个文件 到 Java 对象中.我知道 J6 中的 SAX 存在拒绝 maxOccurs 行的问题，我已将其更改为 unbounded.但是，当我 xjc 它时，它并没有创建所有的类 &我需要的枚举.例如，应该有一个 educationLevelType 枚举.更重要的是，我尝试过 MS 的 xsd unmarshaller，它可以正确创建所有内容.
I'm trying to use JAXB to unmarshal this file into Java objects. I know that there's a problem with SAX in J6 that rejects the maxOccurs line, and I've changed it to unbounded. However, when I xjc it, it's not creating all the classes & enums I need. For example, there should be a educationLevelType enum. What's more, I'ved tried MS's xsd unmarshaller, it it creates everything correctly.
比我更有经验的人可以看看这个并告诉我我缺少什么吗?xsd 中是否有需要纠正的地方，或者 JAXB 中是否存在错误?
Can someone with more experience than I look at this and tell me what I'm missing? Is there something that needs to be corrected in the xsd, or is there a bug in JAXB?
更新Blaise 完全按照要求回答了这个问题.不幸的是，恕我直言，这使得 JAXB 一文不值.整个想法是我可以从模式生成类 - 我不应该事先了解有关结构的信息.如果我必须创建一个自定义绑定文件，我还不如创建一个生成我想要的代码的模式.但是，为什么要停在那里?为什么不跳过所有这些步骤并生成我想要的类?
Update Blaise completely answered this question as asked. Unfortunately, IMHO, this makes JAXB worthless. The whole idea is that I can generate classes from a schema - I shouldn't have to know stuff about the structure beforehand. If I have to create a custom bindings file, I might as well just create a schema that produces the code I want. But then, why stop there? Why not just skip all those steps and generate the classes I want?
最后，一位同事向我指出 Apache XMLBeans - 该项目有点老，但它创建对象没有麻烦.Codehaus 也有一个 xmlbeans-maven-plugin .
In the end, a coworker pointed me to Apache XMLBeans - the project's a little older, but it creates the objects without trouble. Codehaus also has a xmlbeans-maven-plugin for it.
推荐答案
有几个枚举值导致了这个问题.这些问题可以通过使用 JAXB 外部绑定文件来解决(见下文).
There are a couple of enumeration values that are causing this issue. These issues can be overcome through the use of a JAXB external binding file (see below).
枚举问题 #1 - 空字符串
您的一些枚举值是空字符串 ("")，这会导致生成字符串而不是枚举属性:
Some of your enum values are empty string (""), which is causing a String rather than an enum property to be generated:
<xs:enumeration value="">
<xs:annotation>
<xs:documentation>Blank</xs:documentation>
</xs:annotation>
</xs:enumeration>
枚举问题 #2 - 数字字符串
一些枚举值是导致生成字符串而不是枚举属性的数字:
Some of the enum values are numbers which is causing a String rather than an enum property to be generated:
<xs:enumeration value="6">
<xs:annotation>
<xs:documentation>6th grade</xs:documentation>
</xs:annotation>
</xs:enumeration>
绑定文件 (bindings.xml)
以下绑定文件可用于解决 educationLevelType 的问题，此处的概念可应用于所有有问题的类型:
The following bindings file can be used to address the issues with the educationLevelType, the concepts here can be applied to all the problematic types:
<jxb:bindings
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
version="2.1">
<jxb:bindings schemaLocation="http://www.acf.hhs.gov/programs/cb/systems/nytd/nytd_data_file_format.xsd">
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='6']">
<jxb:typesafeEnumMember name="SIX"/>
</jxb:bindings>
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='7']">
<jxb:typesafeEnumMember name="SEVEN"/>
</jxb:bindings>
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='8']">
<jxb:typesafeEnumMember name="EIGHT"/>
</jxb:bindings>
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='9']">
<jxb:typesafeEnumMember name="NINE"/>
</jxb:bindings>
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='10']">
<jxb:typesafeEnumMember name="TEN"/>
</jxb:bindings>
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='11']">
<jxb:typesafeEnumMember name="ELEVEN"/>
</jxb:bindings>
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='12']">
<jxb:typesafeEnumMember name="TWELVE"/>
</jxb:bindings>
<jxb:bindings node="//xs:simpleType[@name='educationLevelType']/xs:restriction/xs:enumeration[@value='']">
<jxb:typesafeEnumMember name="BLANK"/>
</jxb:bindings>
</jxb:bindings>
</jxb:bindings>
XJC 调用可以如下进行(-nv 标志如下所述):
The XJC call can be made as follows (the -nv flag is described below):
xjc -nv -b bindings.xml -d out http://www.acf.hhs.gov/programs/cb/systems/nytd/nytd_data_file_format.xsd
这将导致生成以下枚举:
This will cause the following Enum to be generated:
package gov.hhs.acf.nytd;
import javax.xml.bind.annotation.XmlEnum;
import javax.xml.bind.annotation.XmlEnumValue;
import javax.xml.bind.annotation.XmlType;
@XmlType(name = "educationLevelType")
@XmlEnum
public enum EducationLevelType {
@XmlEnumValue("under 6")
UNDER_6("under 6"),
@XmlEnumValue("6")
SIX("6"),
@XmlEnumValue("7")
SEVEN("7"),
@XmlEnumValue("8")
EIGHT("8"),
@XmlEnumValue("9")
NINE("9"),
@XmlEnumValue("10")
TEN("10"),
@XmlEnumValue("11")
ELEVEN("11"),
@XmlEnumValue("12")
TWELVE("12"),
@XmlEnumValue("post secondary")
POST_SECONDARY("post secondary"),
@XmlEnumValue("college")
COLLEGE("college"),
@XmlEnumValue("")
BLANK("");
private final String value;
EducationLevelType(String v) {
value = v;
}
public String value() {
return value;
}
public static EducationLevelType fromValue(String v) {
for (EducationLevelType c: EducationLevelType.values()) {
if (c.value.equals(v)) {
return c;
}
}
throw new IllegalArgumentException(v);
}
}
maxOccurs 问题
对于 maxOccurs 问题，可以使用以下带有 no verify (-nv) 标志的命令行来解析 XML 架构:
For the maxOccurs issue, the following command line with the no verify (-nv) flag can be used to parse the XML schema:
xjc -nv -d out http://www.acf.hhs.gov/programs/cb/systems/nytd/nytd_data_file_format.xsd
这将使您摆脱以下错误，而无需修改 XML 架构:
This will get you past the following error without having to modify the XML schema:
正在解析架构... [错误] 当前解析器的配置不允许 maxOccurs 属性值设置为大于 5,000.
第 41 行http://www.acf.hhs.gov/programs/cb/systems/nytd/nytd_data_file_format.xsd
parsing a schema... [ERROR] Current configuration of the parser doesn't allow a maxOccurs attribute value to be set greater than the value 5,000.
line 41 of http://www.acf.hhs.gov/programs/cb/systems/nytd/nytd_data_file_format.xsd
无法解析架构.
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