cassandra hector 报错了怎么不退出？

cassandra 用java  hector操作， 报错了怎么不退出？我在main方法里面写了下面测试错误处理，
Cluster cluster = HFactory.getOrCreateCluster("Test Cluster",
new CassandraHostConfigurator("localhost:91601"));
下面报错了，但是程序没有退出来，还是在执行状态，我跟中了一下错误处理代码，发现是执行throw new IllegalArgumentException("port out of range:" + port); 为什么throw new IllegalArgumentExceptin 程序还没有退出还是执行状态，
package java.lang;/**
 * Thrown to indicate that a method has been passed an illegal or 
 * inappropriate argument.
 *
 * @author  unascribed
 * @version 1.24, 11/17/05
 * @see     java.lang.Thread#setPriority(int)
 * @since   JDK1.0
 */
public
class IllegalArgumentException extends RuntimeException {
    /**
     * Constructs an <code>IllegalArgumentException</code> with no 
     * detail message. 
     */
    public IllegalArgumentException() {
super();
    }    /**
     * Constructs an <code>IllegalArgumentException</code> with the 
     * specified detail message. 
     *
     * @param   s   the detail message.
     */
    public IllegalArgumentException(String s) {
super(s);
    }
下面是错误。Exception in thread "main" java.lang.IllegalArgumentException: port out of range:91601
at java.net.InetSocketAddress.<init>(InetSocketAddress.java:118)
at org.apache.thrift.transport.TSocket.open(TSocket.java:180)
at org.apache.thrift.transport.TFramedTransport.open(TFramedTransport.java:81)
at me.prettyprint.cassandra.connection.HThriftClient.open(HThriftClient.java:112)
at me.prettyprint.cassandra.connection.ConcurrentHClientPool.<init>(ConcurrentHClientPool.java:43)
at me.prettyprint.cassandra.connection.RoundRobinBalancingPolicy.createConnection(RoundRobinBalancingPolicy.java:58)
at me.prettyprint.cassandra.connection.HConnectionManager.<init>(HConnectionManager.java:69)
at me.prettyprint.cassandra.service.AbstractCluster.<init>(AbstractCluster.java:62)
at me.prettyprint.cassandra.service.AbstractCluster.<init>(AbstractCluster.java:58)
at me.prettyprint.cassandra.service.ThriftCluster.<init>(ThriftCluster.java:17)
at me.prettyprint.hector.api.factory.HFactory.createCluster(HFactory.java:157)
at me.prettyprint.hector.api.factory.HFactory.getOrCreateCluster(HFactory.java:136)
at nosql.cassandra.hector.HectorTest.main(HectorTest.java:35)