1. Build
EXECUTE: Create a CDI (can be JSF2 or Seam project as well).
EXECUTE: Create a bean class in Java Source folder 'src'.
ASSERT: File .classpath has entry

<classpathentry kind="src" path="src"/>

EXECUTE: Rebuild the project and make sure that everything is alright yet.
EXECUTE: Open project properties -> Java Build Path -> Source, select and expand Java Source folder in question, navigate to the node 'Excluded (None)', run 'Edit...' and add exclusion pattern "**".
ASSERT: File .classpath has entry

<classpathentry excluding="**" kind="src" path="src"/>

EXECUTE: Run Clean/Build of the project.
FAILURE: Java Model Exception (attached).

2. Validation
EXECUTE: Create a CDI project.
EXECUTE: Create a named bean 'abc' in class Test1 and reference it in EL in class Test2:

String s = "#{abc.xyz}

where 'xyz' is missing in properties/members of the bean.
ASSERT: On build and and validation, 'xyz' is marked as an error.
EXECUTE: Add class Test2 to patterns excluded from the class path of the project.
ASSERT: Marker is removed from the Test2 file without any failures.
FAILURE: Java Model Exception.

3. Hyperlinks
EXECUTE: Repeat steps of item 2.Validation.
EXECUTE: Try open-on at 'xyz'.
ASSERT: No option is found. No failures.
FAILURE: Java Model Exception.

4. Hover
EXECUTE: Repeat steps of item 2.Validation.
EXECUTE: Put mouse over 'abc' and wait for hover.
ASSERT: Hover text about bean 'abc' should appear
FAILURE: NullPointerException

java.lang.NullPointerException
	at org.jboss.tools.jst.jsp.jspeditor.info.JavaStringELInfoHover.getHoverInfo2(JavaStringELInfoHover.java:253)
	at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:142)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo2(JavaEditorTextHoverProxy.java:85)
	at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:166)

Note: Hyperlinks and Hover work in JDT for excluded files as for regular files; we should provide the same when existing model element is referenced from an excluded file.