Update findJsonValueType method to provide better support for Jackson < 2.9

Author: micryc

modules/swagger-core/src/main/java/io/swagger/v3/core/jackson/ModelResolver.java

@@ -1116,18 +1116,18 @@ protected Type findJsonValueType(final BeanDescription beanDesc) {
 
  // use recursion to check for method findJsonValueAccessor existence (Jackson 2.9+)
  // if not found use previous deprecated method which could lead to inaccurate result
- try {
- Method m = BeanDescription.class.getMethod("findJsonValueAccessor");
- AnnotatedMember jsonValueMember = (AnnotatedMember)m.invoke(beanDesc);
- if (jsonValueMember != null) {
- return jsonValueMember.getType();
- }
- } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+ AnnotatedMember jsonValueMember = invokeMethod(beanDesc, "findJsonValueAccessor");
+ if (jsonValueMember != null) {
+ return jsonValueMember.getType();
+ } else {
  LOGGER.warn("jackson BeanDescription.findJsonValueAccessor not found, this could lead to inaccurate result, please update jackson to 2.9+");
- final AnnotatedMethod jsonValueMethod = beanDesc.findJsonValueMethod();
- if (jsonValueMethod != null) {
- return jsonValueMethod.getType();
- }
+ }
+
+ jsonValueMember = invokeMethod(beanDesc, "findJsonValueMethod");
+ if (jsonValueMember != null) {
+ return jsonValueMember.getType();
+ } else {
+ LOGGER.error("Neither 'findJsonValueMethod' nor 'findJsonValueAccessor' found in jackson BeanDescription. Please verify your Jackson version.");
  }
  return null;
  }
@@ -3057,6 +3057,15 @@ protected boolean isNumberSchema(Schema schema){
  return "number".equals(schema.getType()) || (schema.getTypes() != null && schema.getTypes().contains("number")) || "integer".equals(schema.getType()) || (schema.getTypes() != null && schema.getTypes().contains("integer"));
  }
 
+ private AnnotatedMember invokeMethod(final BeanDescription beanDesc, String methodName) {
+ try {
+ Method m = BeanDescription.class.getMethod(methodName);
+ return (AnnotatedMember) m.invoke(beanDesc);
+ } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+ return null;
+ }
+ }
+
  protected Schema buildRefSchemaIfObject(Schema schema, ModelConverterContext context) {
  if (schema == null) {
  return null;