How do I mitigate Connection leak triggered for connection com.mysql.jdbc.JDBC4Connection@11d08960,

How do I mitigate Connection leak triggered for connection com.mysql.jdbc.JDBC4Connection@11d08960,

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How do I mitigate Connection leak triggered for connection com.mysql.jdbc.JDBC4Connection@11d08960,
Tag : java , By : Bart van Bragt
Date : December 01 2020, 05:00 PM

hop of those help? As I have reviewed my codes over and over again. I came to realize that I was barking at the wrong tree, Seems like hikari is very reliable when it comes to connection leak. The problem is when amazon aws ec2 instance is stealing some of my cpu and is even greater than what i thought. So after the cpu goes up 99%, Connection leak is detected even though my codes clearly closed it in finally block. So the problem lies with the machine.
I thank you for all who participated to answer.

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JDBC MySql connection pooling practices to avoid exhausted connection pool

Tag : java , By : hlpimfalling
Date : March 29 2020, 07:55 AM
it helps some times The exception indicates a typical case of application code which leaks database connections. You need to ensure that you acquire and close all of them (Connection, Statement and ResultSet) in a try-with-resources block in the very same method block according the normal JDBC idiom.
public void create(Entity entity) throws SQLException {
    try (
        Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(SQL_CREATE);
    ) { 
        statement.setSomeObject(1, entity.getSomeProperty());
        // ...
public void create(Entity entity) throws SQLException {
    Connection connection = null;
    PreparedStatement statement = null;

    try { 
        connection = dataSource.getConnection();
        statement = connection.prepareStatement(SQL_CREATE);
        statement.setSomeObject(1, entity.getSomeProperty());
        // ...
    } finally {
        if (statement != null) try { statement.close(); } catch (SQLException logOrIgnore) {}
        if (connection != null) try { connection.close(); } catch (SQLException logOrIgnore) {}
public void close() throws SQLException {
    if (this.connection is still eligible for reuse) {
        do not close this.connection, but just return it to pool for reuse;
    } else {
        actually invoke this.connection.close();

java.sql.SQLException: Connection com.mysql.jdbc.JDBC4Connection@1ab9c42 is closed

Tag : java , By : user140973
Date : March 29 2020, 07:55 AM
will be helpful for those in need Hi all I'm using JSP+Struts2+Tomcat6+Hibernate+mysql as my J2EE framework. the project works fine on local but when I put it on the server after some hours I get this error: , Try to add those properties in your datasource:

Type mismatch: cannot convert from java.sql.Connection to com.mysql.jdbc.Connection

Tag : mysql , By : Blaise Roth
Date : March 29 2020, 07:55 AM
help you fix your problem Remove the import com.mysql.jdbc.* and use import java.sql.Connection. I think it would be ok.

How to check the default port number for mysql connection? Connection not working! jdbc connection

Tag : java , By : Tom Smith
Date : November 19 2020, 12:41 AM
this will help I am trying to connect with database using jdbc in java file. It is not connecting at all and giving me the error constantly "Something went wrong"; I guess it is because of the port number because all other data such as username, password and other code seems correct. , You can access those settings via
mysql> show variables;

jdbc connection with java, singleton connection object or spring jdbc connection?

Tag : java , By : janik
Date : March 29 2020, 07:55 AM
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