第一次连接org.hibernate.exception.JDBCConnectionException：无法获取JDBC连接

Question

I'm having problems with a server in Spring 4 and Mysql with Hibernate, Every first connection it is answering me org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection

My properties.xml is:

<persistence-unit name="defaultPersistenceUnit"
    transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
        <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
        <property name="hibernate.connection.url"
            value="jdbc:mysql://mysql.******?reconnect=true" />
        <property name="hibernate.connection.username" value="root" />
        <property name="hibernate.connection.password" value="****" />
        <property name="hibernate.hbm2ddl.auto" value="update" />
        <property name="hibernate.event.merge.entity_copy_observer"
            value="allow" />

        <property name="c3p0.acquire_increment" value="1" />
        <property name="c3p0.idle_test_period" value="100" />
        <property name="c3p0.max_size" value="100" />
        <property name="c3p0.max_statements" value="0" />
        <property name="c3p0.min_size" value="10" />
        <property name="c3p0.timeout" value="100" />
        <property name="hibernate.c3p0.preferredTestQuery" value="SELECT 1" />
    </properties>
</persistence-unit>

Someone is having the same problem or knows a solution?

Thanks in advance!!!

Answer 1

Try with the following JDBC url

jdbc:mysql://localhost:3306/poc

poc is schema name