problem with connection pool

I have applications with Tomcat and i implement ConnectionPoolListener
in java beans.

package pe.com.enterprise.util;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
import com.ibm.as400.access.*;

public final class ConnectionPoolImpl implements ConnectionPoolListener {
    private AS400JDBCConnectionPool   pool                        = null;
    public ConnectionPoolImpl(  String driverName, String systemIP,
            String userName, String password, int initialConnections,
int maxConnections )
            throws SQLException {
        try {
            //load DB Driver
            Class.forName( driverName );
           
            AS400JDBCConnectionPoolDataSource datasource = new
AS400JDBCConnectionPoolDataSource( systemIP, userName, password );
            datasource.setErrors( "full" );
            datasource.setExtendedDynamic( true );
            datasource.setCursorHold(false);
            //datasource.setTrueAutoCommit(true);
            datasource.setTransactionIsolation("none");
            datasource.setPackage("APP");
            datasource.setPackageCache(true);
            datasource.setPackageCriteria("select");
           
           
            // Create an AS400JDBCConnectionPool object.
            this.pool = new AS400JDBCConnectionPool( datasource );
           
            this.pool.addConnectionPoolListener( this );
           
            this.pool.setMaxConnections( maxConnections );
           
            if( initialConnections > 0 )
                this.pool.fill( initialConnections );
        } catch( ClassNotFoundException cnfe ) {
            throw new SQLException( "DataBase Driver (" + driverName +
") not found on classpath." );
        } catch( ConnectionPoolException cpe ) {
            throw new SQLException( cpe.getMessage() );
        }
    }
   
    public void close() {
        this.pool.close();
        this.pool = null;
    }
   
    public synchronized Connection getConnection()throws SQLException {
        try {
            if (pool.getActiveConnectionCount() <
pool.getMaxConnections() ){
                return pool.getConnection();
            } else{
                System.out.println("Se paso el nro de conexiones");
                while( pool.getActiveConnectionCount() >=
pool.getMaxConnections() ) {
                    /*try {
                        Thread.sleep(20);
                    } catch( InterruptedException ie ){}*/
                }
               
                return pool.getConnection();
            }
        } catch( ConnectionPoolException cpe ) {
            throw new SQLException( cpe.getMessage() );
        }
    }
   
    //connection pool listener methods...
    public void connectionCreated(ConnectionPoolEvent event) {
    }
   
    public void connectionExpired(ConnectionPoolEvent event) {
    }
   
    public void connectionPoolClosed(ConnectionPoolEvent event) {
    }
   
   
    public void connectionReleased(ConnectionPoolEvent event) {
    }
   
    public void connectionReturned(ConnectionPoolEvent event) {
    }
   
    public void maintenanceThreadRun(ConnectionPoolEvent event) {
    }
}






I have a problem  when use getConnection() and
pool.getActiveConnectionCount() < pool.getMaxConnections().
I wait for free Connection but this never succeded. Then Tomcat return
java.lang.OutMemoryError.
I close all Connection, PreparedStatement and ResultSet.

What's the problem??? Have some idea????