Java25 JFR 新增 Method Timing 和 Method Tracing 事件统计方法执行时间和堆栈

说明

We enhance default.jfc and profile.jfc with two new options, method-timing and method-trace, which control the filter settings for the MethodTiming and MethodTrace events.

method-timing

The method-timing option counts the number of invocations and calculates the average execution time of methods that match the filter

method-trace

the method-trace option records stack traces for methods that match the filter

MethodTiming

启动参数

java -XX:StartFlightRecording:method-timing=@org.springframework.web.bind.annotation.RestController,jdk.MethodTiming#period=5s -jar app.jar

查看信息

jcmd.exe <pid> JFR.view method-timing

MethodTrace

启动参数

java -XX:StartFlightRecording:method-trace=@org.springframework.web.bind.annotation.RestController -jar app.jar

查看信息

jcmd.exe <pid> JFR.view jdk.MethodTracing

过滤语法

可以指定注解、全路径类名、全路径方法名、通配方法名等。

可以指定多个过滤条件，以;分割

filter ::= target (";" target)*
target ::= class | class-method | method | annotation
class ::= identifier ("." identifier)*
class-method ::= class method
method ::= "::" method-name
method-name ::= identifier | "<clinit>" | "<init>"
annotation ::= "@" class
identifier ::= see JLS §3.8

示例：采集Spring Boot中的RestController注解标注的类中的所有方法，以及所有类的静态初始化方法。

java -XX:StartFlightRecording:method-trace=@org.springframework.web.bind.annotation.RestController;::<clinit> -jar app.jar

JEP 520

https://openjdk.org/jeps/520

JDK25 更多 JFR 更新

https://egahlin.github.io/2025/05/31/whats-new-in-jdk-25.html