SONARJAVA-5619 NPE when semantic can not resolve "java.lang.Object" (#5187)

Author: alban-auzeill

java-frontend/src/main/java/org/sonar/java/model/JTypeSymbol.java

@@ -34,7 +34,6 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
-import java.util.Objects;
 import java.util.stream.Collectors;
 
 final class JTypeSymbol extends JSymbol implements Symbol.TypeSymbol {
@@ -109,7 +108,8 @@ public Type superClass() {
   @CheckForNull
   private Type convertSuperClass() {
     if (typeBinding().isInterface() || typeBinding().isArray()) {
-      return sema.type(Objects.requireNonNull(sema.resolveType("java.lang.Object")));
+      ITypeBinding objectBinding = sema.resolveType("java.lang.Object");
+      return objectBinding != null ? sema.type(objectBinding) : Type.UNKNOWN;
     } else if (typeBinding().getSuperclass() == null) {
       // java.lang.Object
       return null;