Accessing the response body with Spring WebFlux WebClient with onStatus (1 mins read).
How to access the body of an (error) response when using WebClient's onStatus method.
by 
Jamie Tanna
.
#blogumentation
#spring
#spring-boot
#java.
Kind articles
Running a command on a visual selection in Vim (1 mins read).
How to pipe the text in a visual selection to a command, either to run it, or to replace the text in the seletion.
by Jamie Tanna
.
#blogumentation
#vim
#neovim
#command-line.
Updating the CA Certificate bundle in Chef Installations (3 mins read).
How to update/add new certificates to the Certificate Authority Certificate Bundle in a Chef Development Kit / Workstation installation.
by Jamie Tanna
.
#blogumentation
#chef.
Introducing a Go command-line tool for interacting with Micropub servers (1 mins read).
Announcing the initial release of micropub, a CLI for interacting with Micropub servers.
by Jamie Tanna
.
#go
#micropub
#micropub-go.
Automagically formatting on save, with Neovim and Language Server Protocol (LSP) (1 mins read).
How to use Neovim's Language Server Protocol (LSP) support to autoformat code on a file's save.
Gotcha: Segfault when HTTP headers include newlines with Go (2 mins read).
Why you may be receiving a segfault when using http.Client with HTTTP headers that include newlines.
by Jamie Tanna
.
#blogumentation
#go.
Week Notes 22#08 (5 mins read).
What happened in the week of 2022-02-21?
by Jamie Tanna
.
#week-notes.
Converting Spring Boot Property Variables to Environment Variables with Go (1 mins read).
A command-line script to convert a Spring Boot property to an environment variable.
by Jamie Tanna
.
#blogumentation
#go
#command-line
#spring-boot.
Pretty Printing JSON Web Tokens (JWTs) on the Command Line using Go (2 mins read).
How to easily introspect and pretty print a signed JWT (JWS) or an encrypted JWT (JWE) on the command line using Go.
by Jamie Tanna
.
#blogumentation
#go
#command-line
#jwt
#json
#pretty-print.
Gotcha: Field casing is important when marshalling structs to JSON in Go (2 mins read).
Why you may be missing fields from your structs in your Go json.Marshal calls.
by Jamie Tanna
.
#blogumentation
#go
#json.
Testing @Scheduled annotations with Spring (Boot) (2 mins read).
How to test your Spring (Boot) scheduling without waiting for hours.
Creating a "Manual of Me" (1 mins read).
Creating a reference document about how to best collaborate together.
by Jamie Tanna
.
#manual-of-me
#css.
Pretty Printing JSON on the Command Line with Go (1 mins read).
Using Go's JSON module to pretty print JSON objects from the command line.
Reading all of stdin on the command-line with Go (1 mins read).
How to read the whole of stdin, up to EOF, with Go.
Week Notes 22#07 (4 mins read).
What happened in the week of 2022-02-14?
by Jamie Tanna
.
#week-notes.
Exporting a Git repo as an archive (1 mins read).
How to export a Git repo as an archive format, such as a .tar.gz or a .zip.
by Jamie Tanna
.
#blogumentation
#git.
How to interpolate a property inside Spring Security @PreAuthorize / @PostAuthorize (3 mins read).
How to use the value of a property in a Spring Security authorization statement.
by Jamie Tanna
.
#blogumentation
#java
#spring
#spring-boot
#spring-security.
Combining an Audio-only and Video-only MP4 with ffmpeg on the command-line (1 mins read).
How to use ffmpeg to combine two MP4 files, where each file contains audio and video separately.
Week Notes 22#06 (2 mins read).
What happened in the week of 2022-02-07?
by Jamie Tanna
.
#week-notes.
Adding a Wiretap to a Spring WebFlux WebClient to Log All Request/Response Data (2 mins read).
How to log all request/response data from a Spring Webflux WebClient.
by Jamie Tanna
.
#blogumentation
#java
#spring-boot
#spring.
Determining if the Spring Boot Application is Running in Debug or Trace Mode (3 mins read).
How to determine if your Spring Boot application is running in debug mode, for instance to selectively enable other features of your application.
Simplifying Spring (Boot) ExceptionHandlers by extending ResponseStatusException (1 mins read).
How to drive HTTP response status codes from exceptions by extending Spring's ResponseStatusException.
by Jamie Tanna
.
#blogumentation
#java
#spring-boot
#spring.
Bundling Multi-File OpenAPI Documents into a Single File (2 mins read).
Looking at the options we have for converting a multi-file OpenAPI specification to a single document.
Announcing openapi.tanna.dev, a client-side OpenAPI Viewer (1 mins read).
Creating a hosted version of a local and client-side only OpenAPI viewer.
Generating Favicons using ImageMagick on the Command-Line (1 mins read).
How to generate a multi-size favicon.ico on the command-line using ImageMagick.
by Jamie Tanna
.
#blogumentation
#command-line
#imagemagick.
Please Add a Relevant Publish Time to Blog Posts (2 mins read).
A request to bloggers to not use midnight as the time they publish an article.
by Jamie Tanna
.
#blogging.
Excluding Filters When using WebMvcTest (1 mins read).
How to exclude specific Filters from running when performing WebMvcTests.
by Jamie Tanna
.
#blogumentation
#java
#spring
#spring-boot
#testing
#tdd.
Capturing HTTP Requests with okhttp's MockWebServer.takeRequest (1 mins read).
How to use MockWebServer's takeRequest method to verify that HTTP request(s) are sent correctly.
by Jamie Tanna
.
#blogumentation
#java.
Integration Testing Your Spring WebClients with okhttp's MockWebServer (5 mins read).
How to write integration tests using MockWebServer with Spring Boot, for use with WebClients.
by Jamie Tanna
.
#blogumentation
#java
#spring-boot
#testing
#tdd.
Week Notes 22#05 (2 mins read).
What happened in the week of 2022-01-31?
by Jamie Tanna
.
#week-notes.
Generate Plain Old Java Objects (POJOs) from OpenAPI Model Definitions with Gradle (2 mins read).
How to generate POJOs really quickly and easily, with no manual work, using the Gradle openapi-generator Plugin.
Running Elements API Viewer to Verify Local OpenAPI/Swagger Documents (2 mins read).
How to run Elements UI locally to visualise OpenAPI documents.
I don't think you should be logging that? 😳 (12 mins read).
Common pitfalls and dangerous things that you should be watching out for in your log messages.
by Jamie Tanna
.
#blogumentation
#logs.
Validating a MockMvc Response Has No Content Type (1 mins read).
How to validate, in a MockMvc test, whether the response has no content-type nor a body.
by Jamie Tanna
.
#blogumentation
#spring
#spring-boot
#testing.
Replacing Text in Vim with the Output of a Command (1 mins read).
How to replace text under the cursor with the output of a command.
by Jamie Tanna
.
#blogumentation
#vim
#neovim
#command-line.
Integration Testing Your Spring RestTemplates with RestClientTest, using spring-test (8 mins read).
How to write integration tests using RestClientTest with Spring Boot, for use with RestTemplate and RestTemplateBuilders.
by Jamie Tanna
.
#blogumentation
#java
#spring
#spring-boot
#testing
#tdd.
Running Swagger UI to Verify Local OpenAPI/Swagger Documents (2 mins read).
How to run Swagger UI locally to visualise OpenAPI documents.
Week Notes 22#04 (3 mins read).
What happened in the week of 2022-01-24?
by Jamie Tanna
.
#week-notes.
Create Executables, not Shell Aliases or Functions (2 mins read).
Why I create standalone executable scripts instead of shell aliases or functions.
Announcing spring-content-negotiator, a Java Library for Content Negotiation with Spring (1 mins read).
Releasing a new library that can support content negotiation in Spring (Boot) applications, i.e. in Filters or ExceptionHandlers.
by Jamie Tanna
.
#spring
#spring-boot
#spring-content-negotiator
#content-negotiation.
Getting Started with jMolecules and the (Classical) Onion Architecture, with a Spring Boot project (6 mins read).
A guided example of converting a Spring Boot project to the Onion Architecture pattern.
by Jamie Tanna
.
#blogumentation
#java
#architecture
#spring-boot
#onion-architecture
#jmolecules
#archunit.
Week Notes 22#03 (4 mins read).
What happened in the week of 2022-01-17?
by Jamie Tanna
.
#week-notes.
How to Create and Unit Test Java Bean Validation Annotations (12 mins read).
A guided example through what the different type of annotation ElementTypes are, with respect to Bean Validation, and how to write unit tests for them.
by Jamie Tanna
.
#blogumentation
#java
#bean-validation
#testing
#tdd.
Codifying Your Technical / Architectural Standards with ArchUnit (7 mins read).
How to use ArchUnit to codify your technical standards to reduce code review requirements, and arrive at a more consistent codebase.
by Jamie Tanna
.
#blogumentation
#java
#archunit
#code-review.
Appending to a Querystring using Go (1 mins read).
How to append query parameters in a URL in Go.
by Jamie Tanna
.
#blogumentation
#go
#web.
Don't Just String Append to a Querystring (1 mins read).
Why you shouldn't use concatenate strings together to append to a querystring.
by Jamie Tanna
.
#web.
Simplifying Spring (Boot) ExceptionHandlers with ResponseStatus Annotations (2 mins read).
How to use annotations to drive HTTP response codes from a Spring ExceptionHandler.
by Jamie Tanna
.
#blogumentation
#java
#spring-boot
#spring.
Use SLF4J, not Log4J, as Your Logging Interface (3 mins read).
Why we should be using the interface API for logging, rather than the underlying implementation's API.
Using the Facade Pattern to More Easily Test static or Complex Classes (2 mins read).
How to use the Facade design pattern to more easily test classes that are more complex than our tests need to understand.
by Jamie Tanna
.
#java
#testing.
Mocking void methods with Mockito (1 mins read).
How to Mock a void method with Mockito, for instance to throw an exception.