Illegal class inheritance loop.使用JAXB 2.0以上版本，使用schema文件綁定Java對象，并配置了外部配置文件binding.xjb后，出現這個(gè)錯誤。
現已解決，如下：
1、schema文件po.xsd：
1<?xml version="1.0" encoding="utf-8"?>
2<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
3 <xs:element name="AAAA">
4 <xs:annotation>
5 <xs:documentation>Root</xs:documentation>
6 </xs:annotation>
7 <xs:complexType>
8 <xs:sequence>
9 <xs:element name="DDDD" type="xs:string" default="Hello!"/>
10 <xs:element name="VVVV" type="xs:integer" default="2008"/>
11 <xs:element name="SA" minOccurs="0">
12 <xs:complexType>
13 <xs:sequence>
14 <xs:element name="BBBB" type="xs:string"/>
15 <xs:element name="CCCC" type="xs:string"/>
16 <xs:element name="TTTT" type="xs:dateTime" minOccurs="0"/>
17 <xs:element name="PPPP" type="xs:string" minOccurs="0"/>
18 <xs:element name="RRRR" type="xs:base64Binary"/>
19 <xs:element name="CACA" maxOccurs="unbounded">
20 <xs:complexType>
21 <xs:sequence>
22 <xs:element name="CA" type="xs:base64Binary" maxOccurs="unbounded"/>
23 <xs:element name="CRCR" minOccurs="0"/>
24 </xs:sequence>
25 </xs:complexType>
26 </xs:element>
27 </xs:sequence>
28 </xs:complexType>
29 </xs:element>
30 </xs:sequence>
31 </xs:complexType>
32 </xs:element>
33</xs:schema>
2、外部配置文件binding.xjb：
1<jxb:bindings version="1.0"
2 xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
3 xmlns:xs="http://www.w3.org/2001/XMLSchema">
4 <jxb:bindings schemaLocation="po.xsd" node="/xs:schema">
5 <jxb:globalBindings
6 fixedAttributeAsConstantProperty="false"
7 collectionType="java.util.Vector"
8 typesafeEnumBase="xs:NCName"
9 choiceContentProperty="false"
10 typesafeEnumMemberName="generateError"
11 enableFailFastCheck="false"
12 generateIsSetMethod="false"
13 underscoreBinding="asCharInWord"/>
14 <jxb:schemaBindings>
15 <jxb:package name="test.po">
16 <jxb:javadoc><![CDATA[<body>Package level documentation for generated package primer.myPo.</body>]]></jxb:javadoc>
17 </jxb:package>
18 <jxb:nameXmlTransform>
19 <jxb:elementName suffix="Element"/>
20 </jxb:nameXmlTransform>
21 </jxb:schemaBindings>
22
23 <jxb:bindings node="http://xs:element[@name=‘AAAA‘]">
24
25 <jxb:class name="Article">
26 <jxb:javadoc>A <b>Purchase Order</b> Article.</jxb:javadoc>
27 </jxb:class>
28
29 <jxb:bindings node=".//xs:element[@name=‘DDDD‘]">
30 <jxb:property name="hi"/>
31 </jxb:bindings>
32
33 <jxb:bindings node=".//xs:element[@name=‘VVVV‘]">
34 <jxb:property name="year"/>
35 </jxb:bindings>
36
37
38 <jxb:bindings node=".//xs:element[@name=‘SA‘]">
39 <jxb:property name="content">
40 <jxb:baseType name="Content"/>
41 </jxb:property>
42
43 <jxb:bindings node="./xs:complexType">
44 <jxb:class name="Content"/>
45
46 <jxb:bindings node=".//xs:element[@name=‘BBBB‘]">
47 <jxb:property name="title"/>
48 </jxb:bindings>
49
50 <jxb:bindings node=".//xs:element[@name=‘CCCC‘]">
51 <jxb:property name="subTitle"/>
52 </jxb:bindings>
53
54 <jxb:bindings node=".//xs:element[@name=‘TTTT‘]">
55 <jxb:property name="pubDate"/>
56 </jxb:bindings>
57
58 <jxb:bindings node=".//xs:element[@name=‘PPPP‘]">
59 <jxb:property name="organize"/>
60 </jxb:bindings>
61
62 <jxb:bindings node=".//xs:element[@name=‘RRRR‘]">
63 <jxb:property name="contentBinary"/>
64 </jxb:bindings>
65
66 <jxb:bindings node=".//xs:element[@name=‘CACA‘]">
67 <jxb:property name="licence">
68 <jxb:baseType name="Licence"/>
69 </jxb:property>
70
71 <jxb:bindings node="./xs:complexType">
72 <jxb:class name="Licence"/>
73 <jxb:bindings node=".//xs:element[@name=‘CA‘]">
74 <jxb:property name="licenceBinary"/>
75 </jxb:bindings>
76 <jxb:bindings node=".//xs:element[@name=‘CRCR‘]">
77 <jxb:property name="licenceNo"/>
78 </jxb:bindings>
79 </jxb:bindings>
80 </jxb:bindings>
81 </jxb:bindings>
82
83 </jxb:bindings>
84
85 </jxb:bindings>
86
87
88 </jxb:bindings>
89</jxb:bindings>
3、運行：
1xjc -b binding.xjb -d gen po.xsd
完畢！
