Identifying, Reporting, and Fixing CVE-2021-22119: DoS Vulnerability in Spring Security OAuth 2.0

In March 2021, I observed troubling behavior in multiple applications I supported that are built using Spring Boot: they would occasionally stop responding. Eventually, I tracked down the root cause to a DoS (Denial of Service) vulnerability in Spring Security OAuth 2.0: a simple shell script could take down any affected web application. Respecting the … Continue reading Identifying, Reporting, and Fixing CVE-2021-22119: DoS Vulnerability in Spring Security OAuth 2.0

Cypress Testing Integrated with Gradle and Spring Boot

Cypress is a great testing framework for “anything that runs in a browser” allowing for clean, maintainable end to end tests. However, these tests can difficult and annoying to for developers to run, especially those who aren’t front end specialists. The following covers getting existing Cypress tests integrated and easily running within the Gradle-based build … Continue reading Cypress Testing Integrated with Gradle and Spring Boot

Contributing Improved Security to JavaMelody with Content Security Policy

JavaMelody is a web based monitoring tool frequently run in production environments, providing insights including CPU usage, hot spots in code, database connection pool utilization, and more. I’m always on the lookout for ways to improve security, so when a security scan pointed out that the JavaMelody web interface didn’t have a Content Security Policy … Continue reading Contributing Improved Security to JavaMelody with Content Security Policy

Lighthouse Performance Testing

Lighthouse is a great way to establish a build-measure-learn feedback loop resulting in continuous value creation by testing ideas in the areas of SEO, performance, accessibility, and more. In this article, I’ll cover what Lighthouse is and how to add it a project with examples covering pure Javascript (node) projects and Gradle projects (with any … Continue reading Lighthouse Performance Testing

The How and Why Automating Dependency Updates

Organizations already automate running builds, executing tests, and performing deployments to free developers from tedium and improve reliability. The next step is to use automation to improve projects. Tools (bots) can submit pull requests that fix typos, optimize images, and more. I’ve had a great positive experience using a bot to perform the tedious task … Continue reading The How and Why Automating Dependency Updates

Testing a Java application on Windows without Windows

Java is supposed to be “write once, run anywhere” but in practice, there are always platform differences that can and do result in bugs. For that reason, and because in general it’s a good idea to test as much as possible, it’s nice to run tests (even for Java applications) on multiple platforms. As evidence … Continue reading Testing a Java application on Windows without Windows

Reproducible Builds in Java

Reproducible builds are a set of software development practices that create an independently-verifiable path from source to binary code. https://reproducible-builds.org/ Reproducible builds are important and provide benefits in many areas, including: Security. Because the same input source code always provides the same output binary artifact, you know that no attacker modified the toolchain to inject vulnerabilities … Continue reading Reproducible Builds in Java

Version Controlling Database Schemas and Data with Liquibase

Version controlling database schemas facilitates repeatable deployments and consistent environments. The alternative is have a human manually perform database modifications; since humans are human, we tend to make mistakes especially when performing repetitive tasks, and our time is also very expensive compared to that of machines, so automating database schema changes is superior approach. More … Continue reading Version Controlling Database Schemas and Data with Liquibase