java how to connect to a MySQL database in OpenShift -

package library;  import java.sql.connection; import java.sql.drivermanager; import java.sql.sqlexception; import java.util.logging.level; import java.util.logging.logger;  public class conexion {      private string server = "jdbc:mysql://" + system.getenv("openshift_mysql_db_host") + ":" + system.getenv("openshift_mysql_db_port") + "/" + system.getenv("openshift_app_name") + "";     private string user = system.getenv("openshift_mysql_db_username");     private string pass = system.getenv("openshift_mysql_db_password");     private connection conn;      public connection conectar() throws classnotfoundexception, sqlexception {         try {             class.forname("com.mysql.jdbc.driver");             this.conn = drivermanager.getconnection(server, user, pass);         } catch (exception ex) {             logger.getlogger(conexion.class.getname()).log(level.severe, null, ex + ex.getmessage());         }          return this.conn;     }  } 

i have java application lodged in openshift when try connect cartridge mysql nothing happens when connect. stays in servlet , takes no other action

depending on type of java server running on openshift, try reading through 1 of these articles, should database connection , running:

• tomcat: https://developers.openshift.com/en/tomcat-ds.html
• jboss as: https://developers.openshift.com/en/jbossas-ds.html
• jboss eap: https://developers.openshift.com/en/jbosseap-ds.html
• wildfly: https://developers.openshift.com/en/wildfly-ds.html