How to remove invalid database connection from pool

Question

I am using connection pooling of tomcat with oracle database. It is working fine, but when i use my application after a long time it is giving

Answer 1

I used validatationquery while configuring the datasource in server.xml file. It is going to check the validity of the connection by executing the query at database before giving to the application.

for Oracle

validationQuery="/* select 1 from dual */"

for MySql

validationQuery="/* ping */"