The result of following steps is that IDE parser is not able to parse the source
although it is possible to compile to file without errors.
1. Take some compileable source with import statements.
2. Inside the import section write "import<ENTER>" (without class name).
3. Save the source (to force re-parsing).
4. This source is not parseable, which is correctly detected. Exception
(attached) is thrown
to the console.
5. Now, remove errorneous import statement and save the file again.
6. The file is compilable.
7. Each time parsing occurs, the attached exception is thrown. The file is
shown as unparseable "for ever". Source hiearchy does not exist.

The workaround is to comment out whole import section, reparse source and
uncomment the
import section again.
Seen on Pilsen 010711_1 EE.