如何解决“未找到方言类：org.hibernate.dialect.MYSQLDialect”异常？

Question

我对休眠非常陌生，所以我正在通过观看视频教程进行练习。我关注的链接是

https://www.youtube.com/watch?v=FFMOZY4z6bE&list=PL4AFF701184976B25&index=5

这是eclipse中的简单java项目。这里我使用mysql数据库。这是我的 Hibernate.cfg.xml 文件，

com.mysql.jdbc.Driver jdbc:mysql://localhost:3306/hibernatedb 根 root

    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">1</property>

    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.MYSQLDialect</property>

    <!-- Disable the second-level cache  -->
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>

    <!-- Drop and re-create the database schema on startup -->
    <property name="hbm2ddl.auto">create</property>

    <!-- Names the annotated entity class -->
    <mapping class="com.***.dto.UserDetails"/>

我遇到这种错误，

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" org.hibernate.HibernateException: Dialect class not found:   org.hibernate.dialect.MYSQLDialect
at org.hibernate.dialect.resolver.DialectFactory.constructDialect(DialectFactory.java:159)
at org.hibernate.dialect.resolver.DialectFactory.buildDialect(DialectFactory.java:99)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:117)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2863)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2859)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1870)
at com.aurodisplay.hibernate.HibernateTest.main(HibernateTest.java:17)
Caused by: java.lang.ClassNotFoundException: org.hibernate.dialect.MYSQLDialect
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:192)
at org.hibernate.dialect.resolver.DialectFactory.constructDialect(DialectFactory.java:156)

任何人都可以帮助我吗？

Answer 1

答案就在问题里。您在 jar 文件中找到了MySQLDialect，但您的配置文件尝试使用MYSQLDialect. Java 区分大小写。

尝试更改为下面

<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

Answer 2

如果您使用的是属性文件，请确保行尾没有空格。

hibernate.dialect=org.hibernate.dialect.MySQLDialect