- Install Eclipse with WTP
- create a new Dynamic Web project and a new JSP file
- add a script block in JSP and introduce an error in it
- Notice in Project Explorer, the JSP file with the problem is marked with error annotation
- Install PyDev, restart Eclipse
- Notice the problem annotation is no longer showing up in Project Explorer
* the project has no pydev nature and there has been no Python features used in the workspace
It seems PyDev is causing the problem.