1、Window->Show View->Problems

2、在项目上右键properties->project Facets->修改右侧的version  保持一致

3、window->preferences->Java->Compiler->设置右侧的Compiler compliance level

4、window->preferences->java->Installed JREs->设置或者选择右侧的Installed JREs

5、以上三处的jdk版本要保持一致，才能编译通过

6、另外，一般新导入的工程需要设置编码格式，如下图：

7、修改jsp的编码格式

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