我通过删除NetBeans的缓存来修复了非常相似的行为.删除文件夹User\.netbeans\6.9\var\cache\index\.

I fixed a very similar behaviour by deleting NetBeans's cache. Delete the folder User\.netbeans\6.9\var\cache\index\.

Windows 7和Netbeans 7.2: User \ AppData \ Local \ NetBeans \ Cache \ 7.2 \ index

Windows 7 and Netbeans 7.2: User\AppData\Local\NetBeans\Cache\7.2\index