diff --git a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaAnnotatorChecker.java b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaAnnotatorChecker.java
index 9bc9d860dd79..ffeb1bbe96eb 100644
--- a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaAnnotatorChecker.java
+++ b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaAnnotatorChecker.java
@@ -42,6 +42,12 @@ public final class JsonSchemaAnnotatorChecker implements JsonValidationHost {
     myErrors = new HashMap<>();
   }
 
+  public JsonSchemaAnnotatorChecker(@NotNull JsonSchemaAnnotatorChecker oldChecker, Map<PsiElement, JsonValidationError> errors) {
+    myProject = oldChecker.myProject;
+    myOptions = oldChecker.myOptions;
+    myErrors = errors;
+  }
+
   @Override
   public @NotNull Map<PsiElement, JsonValidationError> getErrors() {
     return myErrors;
diff --git a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaComplianceChecker.java b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaComplianceChecker.java
index bc806b994c71..41978e4b6347 100644
--- a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaComplianceChecker.java
+++ b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaComplianceChecker.java
@@ -27,7 +27,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
-public final class JsonSchemaComplianceChecker {
+public class JsonSchemaComplianceChecker {
   private static final Key<Set<PsiElement>> ANNOTATED_PROPERTIES = Key.create("JsonSchema.Properties.Annotated");
 
   private final @NotNull JsonSchemaObject myRootSchema;
@@ -94,7 +94,7 @@ public final class JsonSchemaComplianceChecker {
     }
   }
 
-  private void createWarnings(@Nullable JsonSchemaAnnotatorChecker checker) {
+  protected void createWarnings(@Nullable JsonSchemaAnnotatorChecker checker) {
     if (checker == null || checker.isCorrect()) return;
     // compute intersecting ranges - we'll solve warning priorities based on this information
     List<TextRange> ranges = new ArrayList<>();