JDK 23 added two options to java.security.debug:
🔸 +thread → prints the thread and caller info
🔸 +timestamp → prints precise time of each security debug event
Example:
java -Djava.security.debug=all+thread+timestamp MyApp
JDK 25 goes further: thread and timestamp are now enabled by default when you use java.security.debug.
So if you run:
java -Djava.security.debug=access,jar MyApp
…your logs automatically include when events happened and which thread triggered them—no extra flags needed.
WHY YOU’LL CARE:
🔸 Faster root-cause on permission failures & classpath/signing issues
🔸 Clearer correlation with app logs, JFR, and tracing
🔸 Better observability in prod with minimal overhead
QUICK TIPS:
🔸 Scope narrowly (e.g., -Djava.security.debug=access,jar,certpath) to keep logs readable
🔸 Pair with structured logging and a unique request ID for easy stitching
🔸 Save sample logs in runbooks so newcomers can debug like seniors
Level up your security diagnostics with zero extra config on JDK 25. 🚀
#Java25 #JDK25 #Java23 #Security #Debugging #Observability #DevSecOps #JFR #ProductionReady