19.java.lang.NoClassDefFoundException
java.lang.NoClassDefFoundException
未找到类定义错误
当Java虚拟机或者类装载器试图实例化某个类,而找不到该类的定义时抛出该错误。
违背安全原则异常:SecturityException
操作数据库异常:SQLException
输入输出异常:IOException
通信异常:SocketException
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