AI rule node: use `ObjectNode` instead of more general `JsonNode` for JSON Schema config field

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/ai/Langchain4jJsonSchemaAdapter.java

@@ -16,6 +16,7 @@
 package org.thingsboard.rule.engine.ai;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import dev.langchain4j.model.chat.request.json.JsonArraySchema;
 import dev.langchain4j.model.chat.request.json.JsonBooleanSchema;
 import dev.langchain4j.model.chat.request.json.JsonEnumSchema;
@@ -42,10 +43,10 @@ final class Langchain4jJsonSchemaAdapter {
     /**
      * Creates a Langchain4j {@link JsonSchema} from the given root JSON Schema node.
      *
-     * @param rootSchemaNode a valid JSON Schema as a Jackson {@link JsonNode}
+     * @param rootSchemaNode a valid JSON Schema as a Jackson {@link ObjectNode}
      * @return the corresponding Langchain4j {@link JsonSchema}
      */
-    public static JsonSchema fromJsonNode(JsonNode rootSchemaNode) {
+    public static JsonSchema fromJsonNode(ObjectNode rootSchemaNode) {
         return JsonSchema.builder()
                 .name(rootSchemaNode.get("title").textValue())
                 .rootElement(parse(rootSchemaNode))

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/ai/TbAiNode.java

@@ -16,6 +16,7 @@
 package org.thingsboard.rule.engine.ai;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.ListenableFuture;
 import dev.langchain4j.data.message.SystemMessage;
@@ -97,11 +98,11 @@ public final class TbAiNode extends TbAbstractExternalNode implements TbNode {
         aiSettingsId = config.getAiSettingsId();
     }
 
-    private static JsonSchema getJsonSchema(ResponseFormatType responseFormatType, JsonNode jsonSchema) {
+    private static JsonSchema getJsonSchema(ResponseFormatType responseFormatType, ObjectNode jsonSchema) {
         if (responseFormatType == ResponseFormatType.TEXT) {
             return null;
         }
-        return responseFormatType == ResponseFormatType.JSON && jsonSchema != null && !jsonSchema.isNull() ? Langchain4jJsonSchemaAdapter.fromJsonNode(jsonSchema) : null;
+        return responseFormatType == ResponseFormatType.JSON && jsonSchema != null ? Langchain4jJsonSchemaAdapter.fromJsonNode(jsonSchema) : null;
     }
 
     @Override

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/ai/TbAiNodeConfiguration.java

@@ -16,7 +16,7 @@
 package org.thingsboard.rule.engine.ai;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
-import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import dev.langchain4j.model.chat.request.ResponseFormatType;
 import jakarta.validation.constraints.AssertTrue;
 import jakarta.validation.constraints.Max;
@@ -46,7 +46,7 @@ public class TbAiNodeConfiguration implements NodeConfiguration<TbAiNodeConfigur
     @NotNull
     private ResponseFormatType responseFormatType;
 
-    private JsonNode jsonSchema;
+    private ObjectNode jsonSchema;
 
     @Min(value = 1, message = "must be at least 1 second")
     @Max(value = 600, message = "cannot exceed 600 seconds (10 minutes)")
@@ -55,7 +55,7 @@ public class TbAiNodeConfiguration implements NodeConfiguration<TbAiNodeConfigur
     @JsonIgnore
     @AssertTrue(message = "provided JSON Schema must conform to the Draft 2020-12 meta-schema")
     public boolean isJsonSchemaValid() {
-        return jsonSchema == null || jsonSchema.isNull() || JsonSchemaUtils.isValidJsonSchema(jsonSchema);
+        return jsonSchema == null || JsonSchemaUtils.isValidJsonSchema(jsonSchema);
     }
 
     @Override