Shift Left Consultants blog https://shiftleftconsultants.com/blog Java, Spring Boot and Quarkus on AWS: measured results and what they cost. en Migrating Spring Boot to Quarkus: what a working port doesn't tell you https://shiftleftconsultants.com/blog/migrate-spring-boot-to-quarkus https://shiftleftconsultants.com/blog/migrate-spring-boot-to-quarkus Thu, 22 Oct 2026 00:00:00 GMT Porting Spring Boot to Quarkus is now the quick part. Five questions a passing test suite can't answer, and the cold-start numbers for deciding whether to move. java spring-boot quarkus migration graalvm aws-lambda Your Spring Boot migration compiles. Will it survive the first traffic spike? https://shiftleftconsultants.com/blog/spring-boot-migration-traffic-spike https://shiftleftconsultants.com/blog/spring-boot-migration-traffic-spike Sat, 17 Oct 2026 00:00:00 GMT We sent 200 simultaneous cold requests to an AI-generated Quarkus migration on AWS Lambda. The generated version handled 2. After two changes, 68. Then the database ceiling showed up. java aws-lambda spring-boot quarkus migration rds-proxy snapstart We ran one Spring Boot app on Lambda five ways. The defaults were the problem https://shiftleftconsultants.com/blog/tuning-spring-boot-and-quarkus-on-lambda https://shiftleftconsultants.com/blog/tuning-spring-boot-and-quarkus-on-lambda Mon, 12 Oct 2026 00:00:00 GMT Five ways to run one Spring Boot app on AWS Lambda, measured. Tuning took SnapStart from 3.5 s to 1.2 s, and one Hibernate default cost Spring 30 ms a request. java aws-lambda spring-boot quarkus snapstart graalvm hibernate Why we run Java on AWS Lambda instead of Python or Go https://shiftleftconsultants.com/blog/why-java-on-lambda-not-python-or-go https://shiftleftconsultants.com/blog/why-java-on-lambda-not-python-or-go Sat, 10 Oct 2026 00:00:00 GMT The usual advice says Java starts too slowly for Lambda. We run 17 Java functions anyway: measured cold starts, a 51,000-request load test, and what it cost us. java aws-lambda quarkus graalvm spring-boot