java配置JDBC时,用连接池出现错误NoClassDefFoundError: org/apache/commons/pool/KeyedObjectPoolFactory

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/pool/KeyedObjectPoolFactory

at JDBCtools.JDBCUtils.<clinit>(JDBCUtils.java:13)

at JDBCtools.Test.main(Test.java:7)

Caused by: java.lang.ClassNotFoundException: org.apache.commons.pool.KeyedObjectPoolFactory

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 2 more

解决方法：分析上面的错误，是缺少相应的类文件：需要下载并添加一个叫common-pool的jar包。

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NoClassDefFoundError:....KeyedObjectPoolFactory