SonarQube 9.9 LTS offers significant improvements over its predecessor, 8.9 LTS, with enhanced Java analysis that includes over 600 rules for developers. The new version provides faster code analysis, with batch mode processing files in bulk and making analysis 30% faster, as well as support for Java 16-19 versions. It also introduces a new taint analysis configuration to detect potential security vulnerabilities due to specific software dependencies, and improves the handling of nullability annotations. Additionally, SonarQube 9.9 LTS includes new rules designed to ensure secure configurations for Android applications, improve AWS applications with clean code, and detect insecure XML processing. The version also features a new symbolic execution engine that can uncover advanced Java bugs, making it an essential tool for developers seeking to write Clean Code.