//version 8: public class NonNullWithAssertion { @lombok.NonNull private String test; public void testMethod(@lombok.NonNull String arg) { assert arg != null : "arg is marked non-null but is null"; System.out.println(arg); } public void testMethodWithIf(@lombok.NonNull String arg) { if (arg == null) throw new NullPointerException("Oops"); } @java.lang.SuppressWarnings("all") public void setTest(@lombok.NonNull final String test) { assert test != null : "test is marked non-null but is null"; this.test = test; } }