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Asked: 2026-06-12T09:47:21+00:00

I have Web application in Cent Os server created in JSP. After some time

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I have Web application in Cent Os server created in JSP. After some time the connections to mysql execeeds the limit and application could not work without restarting the mysql service.

Even I restarts the mysql and tomcat service some connections are allready created by mysql.

[root@localhost ~]# service tomcat restart

Shutting down Tomcat:
Using CATALINA_BASE: /usr/local/apache-tomcat-7.0.27
Using CATALINA_HOME: /usr/local/apache-tomcat-7.0.27
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-7.0.27/temp
Using JRE_HOME: /usr/java/jre1.6.0_10
Using CLASSPATH: /usr/local/apache-tomcat-7.0.27/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.27/bin/tomcat-juli.jar

Starting Tomcat:
Using CATALINA_BASE: /usr/local/apache-tomcat-7.0.27
Using CATALINA_HOME: /usr/local/apache-tomcat-7.0.27
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-7.0.27/temp
Using JRE_HOME: /usr/java/jre1.6.0_10
Using CLASSPATH: /usr/local/apache-tomcat-7.0.27/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.27/bin/tomcat-juli.jar

[root@localhost ~]#

service mysql restart

Shutting down MySQL. [ OK ]

Starting MySQL…… [ OK ]

[root@localhost ~]# netstat | grep mysql | wc -l

180

As shown above it shows 180 connections all ready running and the connections are like

[root@localhost ~]# netstat | grep mysql

tcp 1 0 localhost.localdomain:49058 localhost.localdomain:mysql CLOSE_WAIT
tcp 1 0 localhost.localdomain:49061 localhost.localdomain:mysql CLOSE_WAIT
tcp 1 0 localhost.localdomain:49060 localhost.localdomain:mysql CLOSE_WAIT
tcp 1 0 localhost.localdomain:49063 localhost.localdomain:mysql CLOSE_WAIT
tcp 1 0 localhost.localdomain:49062 localhost.localdomain:mysql CLOSE_WAIT

I have checked my sql files three times and there is no connections remained unclosed

Please give me the solution…

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1 Answer

  1. Editorial Team

    CLOSE_WAIT tcp socket state means that connection is in process if being closed, waiting for application to execute close() method. You should always execute close() method after finishing the usage of some resource (connection to database, file IO, network connections, etc).

    You can check this example how to correctly handle your database connection.

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