OPI Blog
Learn from experts in their fields

Browsing Tags: spring boot

Feb 2, 2021
Loading Local Test Data in Spring Boot
When working on an API, it can be nice to load some data locally on startup. This is especially true when working on a read-only endpoint where no REST API is available to POST any ...
Wrapping a GraphQL Service With a REST API
Use Case Background Providing a GraphQL service on top of REST APIs is a typical GraphQL use case (e.g., https://graphql.org/blog/rest-api-graphql-wrapper/). Doing so can dramatically improve efficiency and flexibility, allowing data consumers to request only the data ...
Sep 24, 2020
Setup Spring DataSource from values stored in AWS Secret Manager
I was tasked migrating an application to AWS recently. The company wanted the application to store the database credentials in AWS’s Secret Manager. The issue that I had is that if I setup a configuration ...
Concurrently Process a Single Kafka Partition
Concurrency in Kafka is defined by how many partitions make up a topic. For a consumer group, there can be as many consumers as there are partitions, with each consumer being assigned one or more ...
Capturing missing events with Apache Kafka Streams
Introduction There is a lot going on with Kafka Streams. Understanding it takes time, and it always seems there is more you could learn. In this article, I will utilize Kafka Core and Streams for ...
Testing with Spring Kafka and MockSchemaRegistryClient
Spring Kafka provides a variety of testing utilities to make writing integration tests easier. Most notably, the @EmbeddedKafka annotation spins up an embedded broker (and zookeeper) available for tests. The address of the broker is set to ...
Configuring Kafka Topics with Spring Kafka
Here’s a common scenario, your engineering team decides to use Kafka and they start writing producers, consumers, connectors, streams, you name it. Before long, 6 engineers have manually created 20+ topics in the lower environment ...
Jul 19, 2018
Spring Boot / SSL and BadPaddingException
Are you working on getting SSL self signed certificates working with Spring Boot and getting a javax.crypto.BadPaddingException? Hopefully this post will save you some time. I created this post to help remind myself and hopefully ...
Liquibase and Spring Boot
I think it’s great that Spring Boot has built-in support for Liquibase but I think there is missing documentation on it. Some of it is on Spring’s part and others are in Liquibase. I hope ...
MyBatis and Kotlin
I wanted to do a little sample application in Kotlin. I’m getting tired of using JPA for all the things, so I decided to try out MyBatis. I had used MyBatis with great success years ago, ...