Spring+Hibernate Error: org.hibernate.service.UnknownUnwrapTypeException: Cannot unwrap to requested

错误原因:
缺少数据源.
我的是因为没有在hibernate的配置文件hibernate.cfg.xml配置文件中配置连接池.
解决方案:
在hibernate.cfg.xml配置文件配置连接池

配置c3p0连接池:

<!-- 配置连接池 -->
        <property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
        <!-- 配置连接池参数信息 -->
        <property name="hibernate.c3p0.max_size">5</property>   <!-- 最大连接数 -->
        <property name="hibernate.c3p0.min_size">2</property>   <!-- 最小连接数 -->
        <property name="hibernate.c3p0.timeout">5000</property> <!-- 超时时间 -->
        <property name="hibernate.c3p0.max_statements">100</property>   <!-- 最大执行的命令格个数 -->
        <property name="hibernate.c3p0.idle_test_period">30000</property> <!-- 空闲测试时间 -->
        <property name="hibernate.c3p0.acquire_increment">2</property>  <!-- 连接不够用时,每次增加的个数 -->
Caused by: org.hibernate.HibernateException: Unable to determine Dialect without JDBC metadata (please set 'jakarta.persistence.jdbc.url' for common cases or 'hibernate.dialect' when a custom Dialect implementation must be provided) at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:191) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:87) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.getJdbcEnvironmentWithDefaults(JdbcEnvironmentInitiator.java:143) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.getJdbcEnvironmentUsingJdbcMetadata(JdbcEnvironmentInitiator.java:348) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:107) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:68) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:130) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-6.4.4.Final.jar:6.4.4.Final] ... 31 common frames omitted
最新发布
03-29
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