First test case covers as-you-type CDI validation for CDI beans fail : STEP: create dynamic web project with simple bean: A.test public class A { public A() { } } STEP: enable cdi support on the project STEP: modify bean to be session scoped (don't save the file): A.java @SessionScoped public class A { public A() { } } FAIL: there is no expected validation warning ("Managed bean A1 which declares a passivating scope SessionScoped must be passivation capable [JSR-299 §6.6.4] ") STEP: save the file (validation marker should be finally invoked) STEP: remove line with session scoped annotation (don't save the file) FAIL: validation marker is still there even session scoped validation is removed STEP: save the file (validation marker should disappear) Second test case covers as-you-type CDI validation for beans.xml fail : STEP: create dynamic web project with one simple bean (A1.java) and one alternative bean (A2.java) but don't register alternative bean in beans.xml: STEP: create beans.xml via wizard STEP: enable cdi support on the project STEP: modify beans.xml to contain non-alternative bean A1 (don't save the file) FAIL: there is no expected validation error ("is not an alternative bean class [JSR-299 §5.1.1] ") STEP: save the file (validation marker should be finally invoked) STEP: modify alternative bean in beans.xml to be A2.java (don't save the file) FAIL: validation marker is still there even that A2.java is regular alternative bean STEP: save the file (validation marker should disappear)