sts springsourcetoolsuite - Small exclamation icon over my STS project icon -

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i working on struts project using spring source toolsuite ide.

when there complier errors or something, red x mark or yellow exclamation mark appear on icon project.

but after made sure there no complier errors, got exclamation mark in project icon. project building , running , getting proper output.

why there? how can find out complaining about?

click window -> show view -> problems , you'll see list of errors/warnings , can take there.


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