hibernate JPA链接有问题

[eacc31]

hibernate 5.2.17

错误代码

Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: javax.persistence.PersistenceException: Unable to locate persistence units
at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:95)
at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:71)
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:52)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
at utils.JPAUtils.<clinit>(JPAUtils.java:11)
Caused by: javax.persistence.PersistenceException: Invalid persistence.xml.
Error parsing XML [line : -1, column : -1] : cvc-elt.1: 找不到元素 'persistence' 的声明。

at org.hibernate.jpa.boot.internal.PersistenceXmlParser.validate(PersistenceXmlParser.java:512)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.loadUrl(PersistenceXmlParser.java:445)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.parsePersistenceXml(PersistenceXmlParser.java:247)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.parsePersistenceXml(PersistenceXmlParser.java:240)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.doResolve(PersistenceXmlParser.java:234)
at org.hibernate.jpa.boot.internal.PersistenceXmlParser.locatePersistenceUnits(PersistenceXmlParser.java:71)
at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:91)
... 5 more

[stacksoverflow]

Caused by: javax.persistence.PersistenceException: Invalid persistence.xml. Error parsing XML [line : -1, column : -1] : cvc-elt.1: 找不到元素 'persistence' 的声明。 xml写错了，是不是没写结束标签 </persistence>

[stacksoverflow]

参考 https://stackoverflow.com/questions/19743886/javax-persistence-persistenceexception-invalid-persistence-xml

[eacc31]

<persistence version="2.0" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:shemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/persistence/persistence_2_0.xsd"> <persistence-unit name="myJPAUnit" transaction-type="RESOURCE_LOCAL"> <properties> <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" /> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/jpa" /> <property name="hibernate.connection.username" value="root" /> <property name="hibernate.connection.password" value="qwer1234" /> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.format_sql" value="true" /> <property name="hibernate.hbm2ddl.auto" value="update" /> </properties> </persistence-unit> </persistence>

[eacc31]

弄了半天了, 死活找不到原因.

[stacksoverflow]

查看persistence version="2.0"和JPA的版本是否匹配， 参考 https://stackoverflow.com/questions/20176545/javax-persistence-persistenceexception-jpahibernate/21229236

[stacksoverflow]

参考 https://stackoverflow.com/questions/14558931/which-version-of-hibernate-support-jpa-2-1 2.0好像有点太老了。

[stacksoverflow]

还有这个 http://www.oracle.com/webfolder/technetwork/jsc/xml/ns/persistence/index.html