Eclipse: Syntax Error, parameterized types are only if source level is 1.5

Question

I try to use the following code:

ArrayList
Map

Eclipse complains about both of them: Syntax Error, para

Answer 1

I get this fairly regularily. Currently what's working for me (with Photon) is:

• Close project
• Open project

If this doesn't work :

• Close project
• Exit Eclipse
• Restart Eclipse
• Open Project

I know, stupid isn't it.