CODEWITHSUNDEEP
mysqlhibernatetomcatstrutsc3p0
Dan Jay
Dan Jay

Reputation: 873

Hibernate - Tomcat - MySQL issue

Dear All,
I'm testing a Struts webApp using hibernate-mysql on tomcat7...

After the 8 hours timeout period my webApp always crashes. I've changed configurations here and there. But no success.

I really appreciate your attention...

Here some lines from hibernate.xml 

 property name="hibernate.bytecode.use_reflection_optimizer">false
    property name="hibernate.c3p0.idle_test_period">30
    property name="hibernate.c3p0.max_size">600
    property name="hibernate.c3p0.max_statements">50
    property name="hibernate.c3p0.min_size">5
    property name="hibernate.c3p0.timeout">1800
    property name="hibernate.c3p0.testConnectionOnCheckout">true
    property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider
    property name="hibernate.c3p0.validate">true
    property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver
    property name="hibernate.connection.url">jdbc:mysql://localhost:3306/stockdb?autoReconnect=true

Here are some of lines from my stacktraces:


    com.mchange.v2.c3p0.impl.NewPooledConnection handleThrowable
    WARNING: [c3p0] A PooledConnection that has already signalled a Connection error is still in use!
    ...



WARNING: [c3p0] Another error has occurred [ com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after statement closed. ] which will not be reported to listeners!
...

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after statement closed.



...
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014)
...



at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.getMaxRows(NewProxyPreparedStatement.java:1200)




at org.hibernate.jdbc.AbstractBatcher.closeQueryStatement(AbstractBatcher.java:212)


...
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
...

Please help!

Upvotes: 2

Views: 1197

Answers (1)

hd1
hd1

Reputation: 34677

Tomcat has a database connection pool that's included out of the box. To configure MySQL, for example:

<Context>

    <!-- maxActive: Maximum number of database connections in pool. Make sure you
         configure your mysqld max_connections large enough to handle
         all of your db connections. Set to -1 for no limit.
         -->

    <!-- maxIdle: Maximum number of idle database connections to retain in pool.
         Set to -1 for no limit.  See also the DBCP documentation on this
         and the minEvictableIdleTimeMillis configuration parameter.
         -->

    <!-- maxWait: Maximum time to wait for a database connection to become available
         in ms, in this example 10 seconds. An Exception is thrown if
         this timeout is exceeded.  Set to -1 to wait indefinitely.
         -->

    <!-- username and password: MySQL username and password for database connections  -->

    <!-- driverClassName: Class name for the old mm.mysql JDBC driver is
         org.gjt.mm.mysql.Driver - we recommend using Connector/J though.
         Class name for the official MySQL Connector/J driver is com.mysql.jdbc.Driver.
         -->

    <!-- url: The JDBC connection url for connecting to your MySQL database.
         -->

  <Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="javauser" password="javadude" driverClassName="com.mysql.jdbc.Driver"
               url="jdbc:mysql://localhost:3306/javatest"/>

</Context>

Then you'll need to configure your connection as follows:

    public static void main(String[] args) throws Exception {
        PoolProperties p = new PoolProperties();
        p.setUrl("jdbc:mysql://localhost:3306/mysql");
        p.setDriverClassName("com.mysql.jdbc.Driver");
        p.setUsername("root");
        p.setPassword("password");
        p.setJmxEnabled(true);
        p.setTestWhileIdle(false);
        p.setTestOnBorrow(true);
        p.setValidationQuery("SELECT 1");
        p.setTestOnReturn(false);
        p.setValidationInterval(30000);
        p.setTimeBetweenEvictionRunsMillis(30000);
        p.setMaxActive(100);
        p.setInitialSize(10);
        p.setMaxWait(10000);
        p.setRemoveAbandonedTimeout(60);
        p.setMinEvictableIdleTimeMillis(30000);
        p.setMinIdle(10);
        p.setLogAbandoned(true);
        p.setRemoveAbandoned(true);
 p.setJdbcInterceptors("org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer");
        DataSource datasource = new DataSource();
        datasource.setPoolProperties(p); 

        Connection con = null;
        con = datasource.getConnection();

Now, proceed as one normally would with your JDBC code.

Upvotes: 2

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