From 8ea116a3aae244e2cb224dcda92ec46c81278fa0 Mon Sep 17 00:00:00 2001
From: Jens Wille <jens.wille@hbz-nrw.de>
Date: Fri, 18 Oct 2024 11:31:58 +0200
Subject: [PATCH] Switch profiling from HPROF to Java Flight Recorder.

After the switch to Java 11 (#343), the JVM TI hprof Agent (introduced in e144936) is no longer available (removed in JDK 9, see https://bugs.openjdk.org/browse/JDK-8046661).

Use the `jfr` command-line tool or JDK Mission Control (https://jdk.java.net/jmc/) to analyze the recording file.
---
 .gitignore                  | 2 +-
 build.gradle                | 2 +-
 metafix-runner/build.gradle | 6 ++++--
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 12ec8d9a..c738b091 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,7 @@ out/
 node_modules/
 xtext-server/
 package-lock.json
-*.hprof.txt
+*.jfr
 *.vsix
 /metafix/src/test/resources/org/metafacture/metafix/integration/**/*.diff
 /metafix/src/test/resources/org/metafacture/metafix/integration/**/*.err
diff --git a/build.gradle b/build.gradle
index 566eb558..569c60cf 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 //  excludes = [
 //    '**/*.diff',
 //    '**/*.err',
-//    '**/*.hprof.txt',
+//    '**/*.jfr',
 //    '**/*.out',
 //    '**/*.vsix',
 //    '**/.*',
diff --git a/metafix-runner/build.gradle b/metafix-runner/build.gradle
index 783e85e2..fe2f8d9b 100644
--- a/metafix-runner/build.gradle
+++ b/metafix-runner/build.gradle
@@ -42,8 +42,10 @@ application {
   if (project.hasProperty('profile')) {
     def file = project.getProperty('profile') ?: project.name
     def depth = project.hasProperty('profile.depth') ? project.getProperty('profile.depth') : 8
-    def cutoff = project.hasProperty('profile.cutoff') ? project.getProperty('profile.cutoff') : 0.001
 
-    applicationDefaultJvmArgs = ["-agentlib:hprof=heap=sites,cpu=samples,depth=${depth},cutoff=${cutoff},file=${file}.hprof.txt"]
+    applicationDefaultJvmArgs = [
+      "-XX:FlightRecorderOptions=stackdepth=${depth}",
+      "-XX:StartFlightRecording=dumponexit=true,filename=${file}.jfr,settings=profile"
+    ]
   }
 }