Jamie Tanna | Software Engineer

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💡 Did you know that with Groovy 4, you can write a code that can be run as a @Java program without even adding Groovy libraries to the classpath? 😮 For more Groovy 4 features, check this video: youtube.com/watch?v=fTxFa2… #groovylang #java #programming #learning #programmingtips
Szymon Stepniak 🇺🇦 (@wololock)Fri, 22 Apr 2022 04:56 +0000

Fri, 22 Apr 2022 07:46 by Jamie Tanna . #java #groovy.

Bookmarked CVE-2022-21449: Psychic Signatures in Java by Neil Madden

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The long-running BBC sci-fi show Doctor Who has a recurring plot device where the Doctor manages to get out of trouble by showing an identity card which is actually completely blank. Of course, this …

Recommended read: CVE-2022-21449: Psychic Signatures in Java – Neil Madden https://neilmadden.blog/2022/04/19/psychic-signatures-in-java/

Wed, 20 Apr 2022 12:39 by Jamie Tanna . #java #security.

Bookmarked Optimizing AWS Lambda function performance for Java | Amazon Web Services

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This post is written by Mark Sailes, Senior Specialist Solutions Architect. This blog post shows how to optimize the performance of AWS Lambda functions written in Java, without altering any of the function code. It shows how Java virtual machine (JVM) settings affect the startup time and performance. You also learn how you can benchmark […]

Recommended read: Optimizing AWS Lambda function performance for Java | Amazon Web Services https://aws.amazon.com/blogs/compute/optimizing-aws-lambda-function-performance-for-java/

Thu, 31 Mar 2022 20:08 by Jamie Tanna . #java #aws-lambda.

Liked https://twitter.com/delabassee/status/1506579054589353992 .

Wed, 23 Mar 2022 10:49 by Jamie Tanna . #java.

Avoiding Spring context issues when parallelising @Nested Spring integration tests (3 mins read).

Using abstract base classes to reduce risk of Spring context overall issues with Spring (Boot) integration tests.

Tue, 22 Mar 2022 11:44 by Jamie Tanna . #blogumentation #java #spring #spring-boot #testing #tdd.

Integration Testing Your Spring WebClients with Wiremock (4 mins read).

How to write integration tests using Wiremock, for use with WebClients.

Tue, 22 Mar 2022 10:38 by Jamie Tanna . #blogumentation #java #spring-boot #testing #tdd.

Liked https://jlelse.blog/micro/2022/03/2022-03-17-myhgz .

Fri, 18 Mar 2022 08:11 by Jamie Tanna . #java.

Solving ConnectExceptions with the Kubernetes Java ApiClient (1 mins read).

How I solved ConnectExceptions in my Kubernetes Java client usage, by moving to cluster mode.

Wed, 16 Mar 2022 17:51 by Jamie Tanna . #blogumentation #kubernetes #java.

Bookmarked Why does java.net.URL's hashcode resolve the host to an IP?

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Is the idea after the first resolution it'll rely on OS caching? Still this seems inefficient and in cases of multiple domains resolving to the same IP, incorrect. What am I missing?

Recommended read: Why does java.net.URL's hashcode resolve the host to an IP? - Stack Overflow https://stackoverflow.com/questions/2348399/why-does-java-net-urls-hashcode-resolve-the-host-to-an-ip

Wed, 16 Mar 2022 11:30 by Jamie Tanna . #java.

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I'm thrilled to announce the release of part 1 of my Java 17 course! 🎉 This course provides a comprehensive overview of Java basics, decision and repetition structures, methods, and objects. There's lots of examples and some fun independent challenges! linkedin.com/learning/java-…
Angie Jones (@techgirl1908)Tue, 15 Mar 2022 18:52 GMT

Tue, 15 Mar 2022 20:02 by Jamie Tanna . #java.

Gotcha: checked and unchecked exception handling from Spring WebFlux WebClient (2 mins read).

How checked and unchecked exceptions may appear when testing your WebClient code.

Fri, 04 Mar 2022 17:06 by Jamie Tanna . #blogumentation #spring #spring-boot #java #testing.

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.

Fri, 04 Mar 2022 16:55 by Jamie Tanna . #blogumentation #spring #spring-boot #java.

Liked https://www.infoq.com/news/2022/03/java-18-so-far/ .

Thu, 03 Mar 2022 14:27 by Jamie Tanna . #java.

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After I drink coffee I show my empty cup to the IT guy and say that I have successfully installed Java. He hates me.
Jay Humor (@jayweingarten)Tue, 01 Mar 2022 17:54 GMT

Wed, 02 Mar 2022 21:53 by Jamie Tanna . #shitpost #java.

Liked https://www.baeldung.com/java-flatten-nested-collections .

Tue, 01 Mar 2022 14:31 by Jamie Tanna . #java.

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After so many years, I learned the format of console logging in Java can be defined in logging properties config file. See docs.oracle.com/en/java/javase… for clear explanation. The "Since 1.4" makes me feel very dumb, but better late than never!
Johan Vos (@johanvos)Sun, 27 Feb 2022 16:21 GMT

Sun, 27 Feb 2022 19:23 by Jamie Tanna . #java.

Liked https://errorprone.info/ .

Tue, 22 Feb 2022 15:55 by Jamie Tanna . #java.

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.

Thu, 17 Feb 2022 16:35 by Jamie Tanna . #blogumentation #java #spring #spring-boot #spring-security.

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If you don't write Javadoc cause "it ages", better not update to #JDK18 because that excuse goes out the window. Now you can just write... /** * Here's how it works: * { example-code } */ ... while having your build compile and test `example-code`. youtube.com/watch?v=m2cVOY…
Nicolai Parlog (@nipafx)Thu, 10 Feb 2022 16:35 GMT

Mon, 14 Feb 2022 10:07 by Jamie Tanna . #java.

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Ha! There's a Java tool called Jar Jar Links code.google.com/p/jarjar/
Stuart Sierra (@stuartsierra)Mon, 13 May 2013 20:28 +0000

Sun, 13 Feb 2022 16:38 by Jamie Tanna . #java #star wars.

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.

Sun, 13 Feb 2022 10:01 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.

Sun, 13 Feb 2022 10:01 by Jamie Tanna . #blogumentation #java #spring-boot.

Simplifying Spring (Boot) ExceptionHandlers by extending ResponseStatusException (1 mins read).

How to drive HTTP response status codes from exceptions by extending Spring's ResponseStatusException.

Sat, 12 Feb 2022 09:41 by Jamie Tanna . #blogumentation #java #spring-boot #spring.

Interesting. I've been using Toolchains plugin for Gradle https://www.jvt.me/posts/2021/06/09/gradle-toolchain/ and Maven https://www.jvt.me/posts/2020/08/24/maven-toolchains/ to manage this for me

Fri, 11 Feb 2022 10:20 by Jamie Tanna . #java.

Excluding Filters When using WebMvcTest (1 mins read).

How to exclude specific Filters from running when performing WebMvcTests.

Mon, 07 Feb 2022 10:55 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.

Mon, 07 Feb 2022 10:44 by Jamie Tanna . #blogumentation #java.

Liked https://stackoverflow.com/questions/19030954/cant-find-nullable-inside-javax-annotation/19031259#19031259 .

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.

Mon, 07 Feb 2022 10:44 by Jamie Tanna . #blogumentation #java #spring-boot #testing #tdd.

Sun, 06 Feb 2022 14:22 by Jamie Tanna . #java #jsr305.

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.

Sat, 05 Feb 2022 19:29 by Jamie Tanna . #blogumentation #gradle #java #openapi.

Bookmarked https://www.infoq.com/presentations/starling-bank/ .

Recommended read: Building a Reliable Cloud-Based Bank in Java https://www.infoq.com/presentations/starling-bank/

Sat, 05 Feb 2022 08:49 by Jamie Tanna . #architecture #java #starling.

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Who knew that a @Java developer as the best job in the UK according to ⁦@Glassdoor⁩. Feel lucky to be in the industry!
George Adams (@gdams_)Thu, 03 Feb 2022 17:56 GMT

Fri, 04 Feb 2022 15:55 by Jamie Tanna . #java.

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#Java18 is just around the corner! ☕️ GA date ➡️ 2022-03-22 ☕️ 9 #JEPs ☕️ Visit ➡️ openjdk.java.net/projects/jdk/1… #OpenJDK #JDK #JDK18
Sharat Chander 💜🦦 (@Sharat_Chander)Tue, 01 Feb 2022 21:53 GMT

Tue, 01 Feb 2022 22:11 by Jamie Tanna . #java.

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.

Tue, 01 Feb 2022 10:40 by Jamie Tanna . #blogumentation #java #spring #spring-boot #testing #tdd.

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.

Fri, 28 Jan 2022 13:45 by Jamie Tanna . #blogumentation #java #architecture #spring-boot #onion-architecture #jmolecules #archunit.

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.

Sun, 23 Jan 2022 10:24 by Jamie Tanna . #blogumentation #java #bean-validation #testing #tdd.

Bookmarked https://youtube.com/watch?v=IzLHmPNmLLw .

Recommended read: Architecturally evident Java applications with jMolecules - YouTube https://youtube.com/watch?v=IzLHmPNmLLw

Sat, 22 Jan 2022 11:00 by Jamie Tanna . #java #jmolecules #architecture.

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.

Fri, 21 Jan 2022 16:34 by Jamie Tanna . #blogumentation #java #archunit #code-review.

Liked https://github.com/xmolecules/jmolecules-integrations .

Fri, 21 Jan 2022 11:54 by Jamie Tanna . #java.

Liked https://github.com/VaughnVernon/IDDD_Samples .

Fri, 21 Jan 2022 11:50 by Jamie Tanna . #java #ddd.

Liked https://github.com/odrotbohm/moduliths .

Fri, 21 Jan 2022 11:40 by Jamie Tanna . #java.

Simplifying Spring (Boot) ExceptionHandlers with ResponseStatus Annotations (2 mins read).

How to use annotations to drive HTTP response codes from a Spring ExceptionHandler.

Thu, 20 Jan 2022 14:48 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.

Thu, 20 Jan 2022 09:33 by Jamie Tanna . #java #logs #slf4j #log4j #logback.

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.

Wed, 19 Jan 2022 13:40 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.

Tue, 18 Jan 2022 15:28 by Jamie Tanna . #blogumentation #java #mockito.

Content Negotiation with Servlet Filter in Spring (Boot) (3 mins read).

How to perform content-negotiation in a Servlet Filter, to serve the correct representation of error to a consumer, based on the Accept header.

Tue, 18 Jan 2022 12:01 by Jamie Tanna . #blogumentation #java #spring-boot #spring #content-negotiation.