java -jar quark.jar info my-application.jar
Use an allowlist:
java -jar quark.jar squash --config quark.properties --input app.jar --output app_optimized.jar Keep META-INF/services/* if you use ServiceLoader ; otherwise, your service providers will disappear. Common Pitfalls and Troubleshooting Even a sharp tool can cut the wrong way. Here is what to watch for. Problem 1: "Unsupported class file version" Error: java.lang.IllegalArgumentException: Unsupported version 65.0 quark.jar
In the vast ecosystem of Java development, optimization tools often fly under the radar. One such hidden gem is quark.jar . While not a household name like javac or maven , this specialized JAR file has garnered a cult following among performance engineers, security analysts, and reverse engineers. java -jar quark