jfinal报错The method renderText(String) is undefined for the type HelloController
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跟着jfinal文档的第一个demo学习的时候，发现运行不了，报错The method renderText(String) is undefined for the type HelloController
然后就看代码，找是不是漏了jar包，再次跟源码比较的时候才发现原来controller类HelloController忘了继承Controller类了。
继承Controller类以后就好了
真是马虎啊
写代码还是得要认真仔细一点啊~
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