Eclipse could not delete error

Question

I\'m working on a project with Eclipse and by now everything was fine, but last time I\'ve tried building it, it returned the error,

\"The project was

Answer 1

Update Spring Boots!

I had the same issue where my spring tool suite threw this error[Windows 7] whenever I make changes to the JSP or resources(css, js, images). It would allow one time save though to reflect the changes but the second time, STS would throw the error that it could not delete the file that I changed [basically could not move the file to bin folder]. I have to stop the application, do project -> clean for the error to go, make the changes and have to start the application. Process explorer said that javaw is having the handle on bindirectory.

I tried all suggestions that are listed as answers - Recreated the workspace, checked project references, updated my Spring tools suite, disabling windows search, indexing, etc. But none worked.

Finally I updated my spring boots from 1.4.0 to 1.5.4 and the error disappeared. So if any of you using Spring Boots facing this issue, check your version and update. You may also need to add spring-boot-devtools to enable hot-swapping with the latest spring boots versions.