关于HibernateException:Unable to read xml 以及Error applying BeanValidation relation

2013-12-31 02:21:22 1.4k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Hibernate DialectResolutionInfo为null的根源与修复 DialectResolutionInfo是Hibernate启动过程中用于数据库方言推断的核心服务，其为null并非配置项缺失的表象问题，而是StandardServiceRegistry构建失败的深层信号。该服务依赖JdbcEnvironment初始化，而后者又强依赖DataSource和正确注入的hibernate.dialect等元数据。当ServiceRegistry未完成applySettings()与build()流程，或存在版本不兼容（如Spring Boot 3.x与Hibernate 5 阅读详情

我们在使用MyEclipse 从DB Broswer 逆向生成Hibernate工程时,会出现Hibernate Exception,这其中有两个很常见其中一个是:Unable to Read XML,另一个是Error applying BeanValidation relational constraints.我们先说第一个吧:
Unable to Read XML这一个是因为无法读取.hbm.xml配置文件,也有说话是无法读取cfg.xml
不过在我的测试中这两者都有,其中原因主要有两个:
原因1:通过myeclipse逆向生成的POJO.hbm.xml的DTD头申明中有特殊符号(空格),这一点,网上有说法是工具生成的标签前后后特殊符号,建议删除.其实主要还是在

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://www.hibernate.net/dtd/hibernate-mapping-3.0.dtd ">

这一句的最后

-3.0.dtd "

,dtd和"有个空格导致的dom4j解析错误.解决了这个问题后,还是出现Unable to Read XML,其实还是因为无法解析这份POJO.hbm.xml,这是因为DTD的引用地址有误,从网上找的答案来看,可以试着将上面的地址中的.net改为.org试下,应该就能成功.
如果出现Could not parse configuration: /hibernate.cfg.xml那应该就是cfg.xml有误,我在调试的时候引用

"http://hibernate.sourceforge.org/hibernate-configuration-3.0.dtd">

时候出现这个异常,但是改为

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

后正常

关于第二个异常Exception in thread "main" org.hibernate.HibernateException: Error applying BeanValidation relational constraints,解决方案请见sivyer123的日志:
http://blog.csdn.net/sivyer123/article/details/9185325

以下Unable to Read XML 异常控制台错误调试记录:

2013-12-31 13:23:47 org.hibernate.annotations.common.Version <clinit>

INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}

2013-12-31 13:23:47 org.hibernate.Version logVersion

INFO: HHH000412: Hibernate Core {4.1.4.Final}

2013-12-31 13:23:47 org.hibernate.cfg.Environment <clinit>

INFO: HHH000206: hibernate.properties not found

2013-12-31 13:23:47 org.hibernate.cfg.Environment buildBytecodeProvider

INFO: HHH000021: Bytecode provider name : javassist

2013-12-31 13:23:47 org.hibernate.cfg.Configuration configure

INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml

2013-12-31 13:23:47 org.hibernate.cfg.Configuration getConfigurationInputStream

INFO: HHH000040: Configuration resource: /hibernate.cfg.xml

2013-12-31 13:23:47 org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity

WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!

2013-12-31 13:23:47 org.hibernate.cfg.Configuration addResource

INFO: HHH000221: Reading mappings from resource: ./com/brady/model/Message.hbm.xml

Exception in thread "main" org.hibernate.InvalidMappingException: Unable to read XML

	at org.hibernate.internal.util.xml.MappingReader.readMappingDocument(MappingReader.java:109)

	at org.hibernate.cfg.Configuration.add(Configuration.java:478)

	at org.hibernate.cfg.Configuration.add(Configuration.java:474)

	at org.hibernate.cfg.Configuration.add(Configuration.java:647)

	at org.hibernate.cfg.Configuration.addResource(Configuration.java:730)

	at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2109)

	at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2081)

	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2061)

	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2014)

	at org.hibernate.cfg.Configuration.configure(Configuration.java:1929)

	at org.hibernate.cfg.Configuration.configure(Configuration.java:1908)

	at com.brady.test.HqlTest.main(HqlTest.java:15)

Caused by: org.dom4j.DocumentException: http://www.hibernate.net/dtd/hibernate-mapping-3.0.dtd%20 Nested exception: http://www.hibernate.net/dtd/hibernate-mapping-3.0.dtd%20

	at org.dom4j.io.SAXReader.read(SAXReader.java:484)

	at org.hibernate.internal.util.xml.MappingReader.readMappingDocument(MappingReader.java:78)

	... 11 more