eclipse project前面红色感叹号

如果删除了某个build path里的jar的源文件而没有在build path里面删除,工程前面就会出现红色感叹号。后果是很严重的,连更新的java文件都不会编译更新。悲催……

 

PS: primefaces中datatable接受类型只能是List不能是Set。所以在ORM的时候用List比Set保险!

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