Eclipse : What does cross sign means in project ...................

Question:
I have a project opened in eclipse, its a java web application. In eclipse I can see that there is a red cross sign with my project name, On expanding my project I can see many files have the same red cross sign.
What does this cross sign means in eclipse? Is it showing some compilation error? if error how can I see the error? Also what does that triangle icon means?

Please check the screenshot above and see the cross and triangle signs...

Answers:

The cross on red ground means an error in this file, while a question mark on yellow ground indicates a warning. You can see them in the Problems tab in eclipse:

You can customize what is treated as an error and as a warning under Window -> Preferences and then search for errors/warnings (Also take a look at the docs: Java Compiler Errors/Warnings Preferences
In addition to the markings on the resources, you can see errors and warnings in an open file next to the scroll bar:

Cross sign shows the error in that Source,Triangle indicates that your source has some warinings
Just open those files could find the Red x under line and marks in the source editor , if warnings will be displayed as Triangle with ! in the side bar of the source editor.

If your source code is large then you can use shortcut ctrl + . to see the errors in the source file. The following shortcuts will move to the warnings and errors from top to bottom in your eclipse

Few shortcuts to see the errors in eclipse:

Next error: `Ctrl + .`
Previous error: `Ctrl + ,`
Quick fixes: `Ctrl + 1`

The cross sign indicates that the file web.xml has some error. Also, possibly some files within the 'jsp' and 'lib' directories also have error.
The yellow triangles are warnings. To see the details of all, Go to Window -> Show view -> Problems

I don't see anyone mentioning one thing that may be confusing to a beginner: the red X appears on the file with the error as well as on all its parents. These other marks are a great convenience when your tree is collapsed—they lead you to the file in error, but can also cause confusion when viewing an expanded tree.

Every error marked with the red X annotation also appears in the Problems view, if the view's filter is properly configured. You configure the filter through the view's local menu (accessed through the little downward-facing triangle in the top-right corner of the view's title bar).