"com.microsoft.sqlserver.jd

threw exception [Handler processing failed; nested exception is java.lang.ExceptionInInitializerError] with root cause
java.lang.SecurityException: class "com.microsoft.sqlserver.jdbc.ISQLServerConnection$$FastClassByProxool$$2b8cf6af"'s signer information does not match signer information of other classes in the same package

使用proxool连接sql server 2012的时候一直有下面的错误，原来以为是proxool的配置文件问题。仔细看看了异常，原来是sqljdbc4.jar在作怪

解决办法是：

打开sqljdbc4.jar 删除META-INFO目录下的检验文件MANIFEST.MF MSFTSIGN.RSA,MSFTSIG.SF即可
文章出处http://blog.csdn.net/bupt_zoucq/article/details/39372205