Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory

在使用DBCP数据库连接池时，由于在项目中只导入了commons-dbcp.jar和commons-pool.jar，在运行测试用例时报错如下：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
	at org.apache.commons.dbcp2.BasicDataSourceFactory.(BasicDataSourceFactory.java:60)
	at utils.JdbcUtils_DBCP.(JdbcUtils_DBCP.java:27)
	at DBCP连接池.TestDbcp.main(TestDbcp.java:17)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 3 more

根据报错提示，缺少了org.apache.commons.logging.LogFactory类，只需导入commons-logging-1.1.1.jar即可；

上述三个jar包下载地址如下：
commons-dbcp.jar
commons-pool.jar
commons-logging-1.1.1.jar