Connections does not returned to pool.I am using DB2 9.1 and Tomcat 7.0.47

[dhritideveloper]

Connections does not returned to the pool, the size of the connection pool increases more than the maxSize. I am using the `DB2 9.1`and `Tomcat 7.0.47`.
To connect to database I have to use db2jcc.jar & db2jcc_license_cu.jar of DB2 9.5 as jars of 9.1 does not work properly.
I am setting `maxSize = "30"` but when I see the database connection log it shows connection more than `30` and it increases to `100` and after that database gets locked. I am using Applet, Servlet & Javabeans (for business logic).I also close all my connections,statements in my applications.

I have configure the Tomcat by changing the `web.xml`, `context.xml` and `server.xml` (which are at the conf directry of the server). The configurations are as follows
**web.xml**

<web-app> <resource-ref> <description>DB2 Datasource example</description> <res-ref-name>jdbc/datasourcename</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> </web-app>
 

**context.xml**

 
<Context> <ResourceLink name="jdbc/datasourcename" global="jdbc/datasourcename" type="javax.sql.DataSource" /> </Context>
 

SERVER.XML

<GlobalNamingResources> <Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatab aseFactory"
pathname="conf/tomcat-users.xml" /> <Resource name="jdbc/datasourcename" auth="Container" 
type="javax.sql.DataSource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFac tory"
testWhileIdle="true"
testOnBorrow="true"
testOnReturn="false"
validationQuery="SELECT 1"
validationInterval="30000"
timeBetweenEvictionRunsMillis="30000"
maxActive="30"
minIdle="1"
maxWait="10000"
initialSize="1"
removeAbandonedTimeout="60"
logAbandoned="true"
removeAbandoned="true"
closeMethod="close" 
abandonWhenPercentageFull="60"
minEvictableIdleTimeMillis="3000"
jmxEnabled="true" jdbcInterceptors="org.apache.tomcat.jdbc.pool.inte rceptor.ConnectionState;org.apache.tomcat.jdbc.poo l.interceptor.StatementFinalizer"
alternateUsernameAllowed="true"
username="user"
password="pass"    
driverClassName="com.ibm.db2.jcc.DB2Driver"    
url="jdbc:db2:://127.0.0.1:50000/DBname" /> </GlobalNamingResources>