Question

I am getting this error. I have my hibernate connections and MVC all setup correct I believe.
I heard MySQL drivers have an issue for database connection.

SEVERE: Servlet.service() for servlet [appServlet] in context with path [/AdministrativeApplication] threw exception [Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection] with root cause
java.sql.SQLException: Unknown database 'testDB'

My hibernate configuration file

    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
     xmlns:tx="http://www.springframework.org/schema/tx"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="
   http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/tx
   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-3.0.xsd
    ">
 <!-- Load Hibernate related configuration -->

<tx:annotation-driven transaction-manager="transactionManager" /> 
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/testDB" />
    <property name="username" value="myroot"/>
    <property name="password" value="*****"/>
    <!-- connection pooling details -->
    <property name="initialSize" value="1"/>
    <property name="maxActive" value="5"/>
    </bean>

    <bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">

    <property name="dataSource" ref="dataSource"/>
    <property name="hibernateProperties">
    <!-- Declare a transaction manager-->
    <props>
    <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
    <prop key="hibernate.show_sql">true</prop>
    <prop key="hibernate.hbm2ddl.auto">update</prop>
    </props>
    </property>
    <property name="annotatedClasses">
    <list>
    <!--   all the annotation entity classes -->
    </list>
    </property>
    </bean>
<!-- Declare a transaction manager-->
 <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"
          p:sessionFactory-ref="sessionFactory" />    
    </beans>

Please let me know what
I could do to resolve this error.

I further added a new java file to test

import java.sql.*;

   public class Connect
   {
       public static void main (String[] args)
       {
           Connection conn = null;

           try
           {
               String userName = "root";
               String password = "******";
               String url = "jdbc:mysql://localhost:3306/testDB";
               Class.forName ("com.mysql.jdbc.Driver").newInstance ();
               conn = DriverManager.getConnection (url, userName, password);
               System.out.println ("Database connection established");
           }
           catch (Exception e)
           {
               e.printStackTrace(System.out);
               System.err.println ("Cannot connect to database server");
           }
           finally
           {
               if (conn != null)
               {
                   try
                   {
                       conn.close ();
                       System.out.println ("Database connection terminated");
                   }
                   catch (Exception e) { /* ignore close errors */ }
               }
           }
       }
   }

I get this error . Also I started the MySQL console with this command.
“C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqld.exe”

I get this error

java.sql.SQLException: Unknown database 'testdb'
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2975)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:798)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3700)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1203)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2572)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1485)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at java.sql.DriverManager.getConnection(DriverManager.java:582)
    at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at Connect.main(Connect.java:15)
Cannot connect to database server

Can some please help resolve this.
i ran netstats no luck. I do not see at what port MySQL is listening at.

Thanks again .
Dhiren

Answer 1

I am getting this error.

This means you did something wrong.

I have my hibernate connections and MVC all setup correct I believe.

See my previous comment – you did not do everything correctly.

I heard MySQL drivers have an issue for database connection.

Nope – MySQL drivers work fine if you set them up properly. You’re doing something wrong, and you’ll make progress faster if you take that attitude.

Before you run Java, start up the MySQL client, log into MySQL. If you can’t, Java won’t be able to, either. See if the daemon is up and running.

See if you have that database available. If not, create it.

If it is created, make sure that you have the tables you need and the user you’re logging in as has appropriate permissions.