此错误网上已经有很多教程讲解,如果你的配置如下:
4.0.0
<groupId>cn.itcast</groupId>
<artifactId>JPA</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.hibernate.version>5.0.7.Final</project.hibernate.version>
</properties>
<dependencies>
<!-- junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- hibernate对jpa的支持包 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${project.hibernate.version}</version>
</dependency>
<!-- c3p0 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>${project.hibernate.version}</version>
</dependency>
<!-- log日志 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- Mysql and MariaDB -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
</dependencies>
<build>
<!--maven插件-->
<plugins>
<!--jdk编译插件-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>utf-8</encoding>
</configuration>
</plugin>
<!--tomcat插件-->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<!-- tomcat7的插件, 不同tomcat版本这个也不一样 -->
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.1</version>
<configuration>
<!-- 通过maven tomcat7:run运行项目时,访问项目的端口号 -->
<port>8080</port>
<!-- 项目访问路径 本例:localhost:9090, 如果配置的aa, 则访问路径为localhost:9090/aa-->
<path>/</path>
</configuration>
</plugin>
</plugins>
</build>
persistence.xml配置如下: <?xml version="1.0" encoding="UTF-8"?>
org.hibernate.jpa.HibernatePersistenceProvider
<!--jpa提供者的可选配置:我们的JPA规范的提供者为hibernate,所以jpa的核心配置中兼容hibernate的配 -->
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
这是hibernate正确的配置,如果没有错误则请考虑时否是你的XML路径错误,必须放在:  这样配置后,报错应该会消失,所以请大家配置文件时,要加以细心.