an exception type mus

今天随便研究发现这么个问题
代码如下
package com.testpackage;

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;

public class Tester {

static {
try {
Configuration config = new PropertiesConfiguration("database.proterties");
String driverClassName = config.getString("DataSource.driverClassName");
} catch (ConfigurationException e) {
e.printStackTrace();
}
}

报错信息为：No exception of type ConfigurationException can be thrown; an exception type must be a subclass of Throwable，

很奇怪，上网搜索一下，原来是需要这个包commons-lang

因为org.apache.commons.configuration.ConfigurationException extends org.apache.commons.lang.exception.NestableException.

最后

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