cubrid.jdbc.driver.CUBRIDException:

 cubrid.jdbc.driver.CUBRIDException: Server refused client connection : max clients, (50), exceeded
at unisql.jdbc.jci.UConnection.<init>(UConnection.java:195)
 at unisql.jdbc.jci.UJCIManager.connect(UJCIManager.java:51)
 at unisql.jdbc.driver.UniSQLDriver.connect(UniSQLDriver.java:140)
 at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
 at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:294)
 at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1247)
 at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1221)



가끔씩 이렇게 Exception이 떨어지는데..
저희 환경은. tomcat5.0 +apache 2.2 + ibatis +struts  큐브리드 7.3버전을 사용하고 있습니다.
사용하고있습니다. 혹시 큐브리드 풀 자체 pool에서 접속 제안을 하는게 있는지 해서요..

<dataSource type="DBCP">
            <property name="driverClassName"    value="cubrid.jdbc.driver.CUBRIDDriver"/>
            <property name="url"    value="jdbc:cubrid:192.168.0.50:33000:ffriend:::"/>
            <property name="username"    value="kpt01"/>
            <property name="password"    value="password"/>
            <property name="maxActive"    value="100"/>
            <property name="maxIdle"    value="30"/>
            <property name="maxWait"    value="10000"/>
            <property name="logAbandoned"    value="false"/>
            <property name="removeAbandoned"    value="true"/>
            <property name="removeAbandonedTimeout"    value="12"/>
        </dataSource>