Better error handling for toExampleValue (#8940)

* better error handling for toExampleValue

* revise logging

* update debug

Author: wing328

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java

@@ -3103,7 +3103,14 @@ public CodegenProperty fromProperty(String name, Schema p) {
         property.title = p.getTitle();
         property.getter = toGetter(name);
         property.setter = toSetter(name);
-        property.example = toExampleValue(p);
+        // put toExampleValue in a try-catch block to log the error as example values are not critical
+        try {
+            property.example = toExampleValue(p);
+        } catch (Exception e) {
+            LOGGER.error("Error in generating `example` for the property {}. Default to ERROR_TO_EXAMPLE_VALUE. Enable debugging for more info.", property.baseName);
+            LOGGER.debug("Exception from toExampleValue: {}", e);
+            property.example = "ERROR_TO_EXAMPLE_VALUE";
+        }
         property.defaultValue = toDefaultValue(p);
         property.defaultValueWithParam = toDefaultValueWithParam(name, p);
         property.jsonSchema = Json.pretty(p);