java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at study.java.DBConnectUtils.(DBConnectUtils.java:46)
at study.java.DBOperateVoidUtils.operate(DBOperateVoidUtils.java:13)
at study.java.DatabaseFactoryImp.insert(DatabaseFactoryImp.java:20)
at study.java.test.Demo.main(Demo.java:26)
Exception in thread "main" java.lang.ExceptionInInitializerError
at study.java.DBOperateVoidUtils.operate(DBOperateVoidUtils.java:13)
at study.java.DatabaseFactoryImp.insert(DatabaseFactoryImp.java:20)
at study.java.test.Demo.main(Demo.java:26)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at study.java.DBConnectUtils.(DBConnectUtils.java:50)
... 3 more
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at study.java.DBConnectUtils.(DBConnectUtils.java:46)
... 3 more
jar放在lib下，已经buildpath了，突然这样了不知道为什么
