DBCP connection pooling exhausted - JDBC JAVA

Hi,
In my application iam using ibatis for db connection.
data source using as dbcp.
sometimes, Iam getting the following error.

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java.sql.SQLException: DBCP could not obtain an idle db connection,
pool exhausted
at com.nobrokerage.login.NBHomeImpl.execute(NBHomeImpl.java:55)
at com.nobrokerage.login.LoginAction.execute(LoginAction.java:35)
at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:
484)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:
1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:
507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
269)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
188)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:
213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:
174)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
117)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:
108)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
174)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:
200)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:
703)
at org.apache.jk.common.ChannelSocket
$SocketConnection.runIt(ChannelSocket.java:895)
at org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)

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Here is the sqlMapConfig.xml

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<settings maxExecute="400" maxExecutePerConnection="5"
maxTransactions="30" statementCacheSize="150" />
<!-- Configure a datasource to use with this SQL Map using Jakarta
DBCP
notice the use of the properties from the above resource -->
<datasource name="basic" default = "true" factory-
class="com.ibatis.db.sqlmap.datasource.DbcpDataSourceFactory">
<property name="JDBC.Driver" value="${driver}"/>
<property name="JDBC.ConnectionURL" value="${url}"/>
<property name="JDBC.Username" value="${username}"/>
<property name="JDBC.Password" value="${password}"/>
<property name="Pool.MaximumActiveConnections" value="10"/>
<property name="Pool.MaximumIdleConnections" value="5"/>
<property name="Pool.MaximumWait" value="60000"/>
</datasource>

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Is active and idle connections value has to increase ?
Can anybody tell me, what is the cause for this error.