Add graalvm-native-images: Boot 4.1 + GraalVM CE for JDK 25, AOT processing,

the tracing agent, and a real reflection-collision trap

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EQNA6DJ9VgCtW6zhCE8Xud

graalvm-native-images/docs/output/01-jvm-baseline.txt

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+$ export JAVA_HOME=/opt/jdk25 && java -jar target/app.jar --server.port=8081
+Starting GraalvmDemoApplication v1.0.0 using Java 25.0.4.1 with PID 796 (/tmp/sbd-work/spring-boot-demo/graalvm-native-images/target/app.jar started by root in /tmp/sbd-work/spring-boot-demo/graalvm-native-images)
+Tomcat started on port 8081 (http) with context path '/'
+Started GraalvmDemoApplication in 3.472 seconds (process running for 4.041)
+
+$ ps -o rss= -p 796
+195356

graalvm-native-images/docs/output/02-native-build.txt

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+$ export JAVA_HOME=/opt/graalvm25 && mvn -Pnative -DskipTests native:compile
+[2/8] Performing analysis...  [*****]                                                                   (94.1s @ 2.35GB)
+   20,126 types,  29,154 fields, and  91,938 methods found reachable
+    7,495 types,   4,032 fields, and  16,651 methods registered for reflection
+       68 types,      71 fields, and      58 methods registered for JNI access
+        0 downcalls and 0 upcalls registered for foreign access
+        4 native libraries: dl, pthread, rt, z
+[6/8] Compiling methods...    [**********]                                                              (99.2s @ 2.18GB)
+                      30.4s (11.7% of total time) in 1838 GCs | Peak RSS: 4.36GB | CPU load: 1.87
+Build artifacts:
+ /tmp/sbd-work/spring-boot-demo/graalvm-native-images/target/graalvm-native-images (executable)
+Finished generating 'graalvm-native-images' in 4m 19s.
+[INFO] BUILD SUCCESS
+[INFO] Total time:  04:31 min
+
+$ ls -lh target/graalvm-native-images target/app.jar
+-rwxr-xr-x 1 root root 93M Sep 20 10:35 target/graalvm-native-images
+-rw-r--r-- 1 root root 22M Sep 20 10:31 target/app.jar

graalvm-native-images/docs/output/03-native-startup-broken.txt

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+$ ./target/graalvm-native-images --server.port=8082
+Starting AOT-processed GraalvmDemoApplication using Java 25.0.2 with PID 1234 (/tmp/sbd-work/spring-boot-demo/graalvm-native-images/target/graalvm-native-images started by root in /tmp/sbd-work/spring-boot-demo/graalvm-native-images)
+Tomcat started on port 8082 (http) with context path '/'
+Started GraalvmDemoApplication in 0.091 seconds (process running for 0.097)
+
+$ ps -o rss= -p 1234
+107984
+
+$ curl -s "localhost:8082/report?format=plain"
+REFLECTION-FAILED class=com.ankurm.graalvmdemo.report.PlainTextReport exception=java.lang.ClassNotFoundException message=com.ankurm.graalvmdemo.report.PlainTextReport
+
+$ curl -s "localhost:8082/report?format=json"
+REFLECTION-FAILED class=com.ankurm.graalvmdemo.report.JsonReport exception=java.lang.ClassNotFoundException message=com.ankurm.graalvmdemo.report.JsonReport

graalvm-native-images/docs/output/04-tracing-agent.txt

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+$ /opt/graalvm25/bin/java -agentlib:native-image-agent=config-output-dir=agent-output -jar target/app.jar --server.port=8083
+Started GraalvmDemoApplication in 5.552 seconds (process running for 6.51)
+
+$ curl -s localhost:8083/hello
+Hello from a GraalVM native image!
+$ curl -s "localhost:8083/report?format=plain"
+OK via reflection on com.ankurm.graalvmdemo.report.PlainTextReport: REPORT: quarterly numbers
+$ curl -s "localhost:8083/report?format=json"
+OK via reflection on com.ankurm.graalvmdemo.report.JsonReport: {"report":"quarterly numbers"}
+
+$ grep -A4 '"com.ankurm.graalvmdemo.report.PlainTextReport"' agent-output/reachability-metadata.json
+{
+  "type": "com.ankurm.graalvmdemo.report.PlainTextReport",
+  "methods": [
+    { "name": "<init>", "parameterTypes": [] }
+  ]
+}

graalvm-native-images/docs/output/05-native-startup-fixed.txt

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+$ ./target/graalvm-native-images --server.port=8085
+Started GraalvmDemoApplication in 0.104 seconds (process running for 0.111)
+
+$ curl -s "localhost:8085/report?format=plain"
+OK via reflection on com.ankurm.graalvmdemo.report.PlainTextReport: REPORT: quarterly numbers
+$ curl -s "localhost:8085/report?format=json"
+OK via reflection on com.ankurm.graalvmdemo.report.JsonReport: {"report":"quarterly numbers"}
+
+$ ps -o rss= -p <pid>
+108120

graalvm-native-images/docs/output/06-package-does-not-compile-native.txt

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+$ mvn -Pnative -DskipTests package
+[INFO] --- native:1.1.8:add-reachability-metadata (add-reachability-metadata) @ graalvm-native-images ---
+[INFO] --- resources:3.5.0:resources (default-resources) @ graalvm-native-images ---
+[INFO] --- compiler:3.15.0:compile (default-compile) @ graalvm-native-images ---
+[INFO] --- spring-boot:4.1.1:process-aot (process-aot) @ graalvm-native-images ---
+[INFO] --- jar:3.5.1:jar (default-jar) @ graalvm-native-images ---
+[INFO] --- spring-boot:4.1.1:repackage (repackage) @ graalvm-native-images ---
+[INFO] BUILD SUCCESS
+[INFO] Total time:  8.791 s
+# No native-image invocation anywhere in this log -- confirmed by grepping the full log for
+# "native-image" and "Generating '": zero matches. Only "mvn -Pnative native:compile" (run
+# separately, see 02-native-build.txt) actually invokes the GraalVM compiler.