Eclipse “cannot be resolved to a type” error

时间:2023-01-29 09:34:14

Eclipse “cannot be resolved to a type” error

 http://zhaoningbo.iteye.com/blog/1137215

引言: 

    eclipse新导入的项目经常可以看到“XX cannot be resolved to a type”的报错信息。本文将做以简单总结。 

正文: 

    (1)jdk不匹配(或不存在)
 

    项目指定的jdk为“jdk1.6.0_18”,而当前eclipse使用的是“jdk1.6.0_22”。需要在BuildPath | Libraries,中做简单调整。 

    (2)jar包缺失或冲突 

    当找不到“XX”所在的jar包时,会报这个错。解决只需要找到(ctrl+点击,可能能看到jar包名称)对应jar包导入项目即可。 

    另外,出现相同的XX时也会报此错。可能需要调包、解包、选删。 

    (3)eclipse查找项目类型策略所致 

    eclipse下,上述两条都对比过了,没有任何问题,可偏偏还报这错。这时,需要操作一下 Project | Clean... ,问题即可解决。原因是,机制所致。因为某些特殊原因,eclipse没能自动编译源代码到build/classes(或其他classes目录),导致类型查找不到。 

Based on the comments here, I started checking how I could make sure that my Ant build 

wouldn’t interfere with my Eclipse build.

I found an option in Eclipse that clears up the problem (and is possibly more efficient than

 changing the 2 build system’s output folders).

Windows–>Preferences–>Java–>Compiler–>Building–>Output folder–>

”Rebuild class files modified by others”. This exists in Eclipse 3.5; I’m not sure about earlier versions.

Checking this seems to have fixed my problems.