I would like to use a custom serializer for Maps, but only if they are <String, String> maps. I attempted to register a StdSerializer<Map,String, String>> following the advice in this post like so: My Serializer looks as follows: This works fine on Map<String, String> objects, but unfortunately it also gets called for other maps as well. How does one restrict
Tag: serialization
@JsonIdentityInfo serialization of items
I’m trying to serialize relations using @JsonItentityInfo to avoid circular references. I’ve created a test to try test the result of the serialization, and I’ve found that jackson is not behaving as I expected. The serialization in not what I though it would be and, in fact, when I try to desarialize the serializated object, an exception is thrown. The
Why is there a “topic” parameter in the overridden serialize() method from Serializer interface in org.apache.kafka.common.serialization
I have observed that implementations of the method serialize() of the Serializer<> interface has two parameters: byte[] serialize(String topic, T data) but the method body does not require String topic parameter at all. So why does it exist? Sample Implementation available in the package org.apache.kafka.common.serialization: Answer In this specific implementation, indeed there’s no usage. Yet, this parameter may be used
ObjectMapper writeValueAsString on ‘null’ vs ‘NullNode.getInstance()’
Consider the following statements: String s1 = new ObjectMapper().writeValueAsString(null); String s2 = new ObjectMapper().writeValueAsString(NullNode.getInstance()); In both the cases, serialized values s1 and s2 would be “null” (in String format). Jackson, by default, serializes null objects without any exception. What are the cases where we need to use NullNode, instead of directly serializing null? Answer “null” here is a string, not
Best way to serialize composite – (design pattern)
I have following java code that is implementation of Composite Design pattern: //composite designed for type safety (all Leaf-only operations only in leaf) interface Component extends Visitable { …
Serialization process constantly overwrites itself?
I’m fairly new to java and trying to do some serialization in my project. I have a bunch of objects called Student and I would like to serialize them. The code I’m using for this is as follows: try{ …
JSON parse error: Cannot deserialize instance of ArrayList
I’m trying to send a JSON to a POST bodyRequest service to use this information as a Java ArrayList or something like that. When I try to do it, I receive a deserialize error This is my JSON: {…
Unable to load a groovy classes
I am trying to serialize and deserialize a groovy object with the below class in the jenkins pipeline. SerializationUtil.groovy package com.sample; import java.io.FileInputStream; import java.io….
Serial version uid in abstract exception class
I have a base custom exception class BaseException public class BaseException extends RuntimeException { } and several custom exceptions that extends BaseException public class CustomException …
Dynamic serialization using Jackson – removing fields with specific annotations
Went down a path of creating an annotation that would dynamic determine whether a field should be serialized or not. The annotation’s implementation is as follows: @Retention(RetentionPolicy.RUNTIME) @…