如下报错：

java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
java.lang.NoClassDefFoundError: Could not initialize class net.sf.json.JSONArray

问题原因在于：jar包不全，将以下jar包导入工程即可：

commons-logging-1.1.1.jar
commons-beanutils-1.8.3.jar
commons-lang-2.5.jar
ezmorph-1.0.6.jar
json-lib-2.3-jdk15.jar