feat(java): Add simple JNI demo

java-jni/.gitignore

@@ -0,0 +1,41 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+*.o
+*.so
+*.class

java-jni/DemoJNI.cpp

@@ -0,0 +1,37 @@
+#include <stdio.h>
+
+#include "DemoJNI.h"
+
+int __attribute__((noinline)) nativeTop1() {
+  for (int i = 0; i < 1000; i++) {
+  }
+
+  return 0;
+}
+
+int __attribute__((noinline)) nativeTop2() {
+
+  for (int i = 0; i < 1000; i++) {
+  }
+
+  return 0;
+}
+
+// ones
+int __attribute__((noinline)) nativeC1() { return nativeTop1(); }
+
+int __attribute__((noinline)) nativeB1() { return nativeC1(); }
+
+JNIEXPORT void JNICALL Java_DemoJNI_nativeA1(JNIEnv *, jobject) {
+
+  printf("%d", nativeB1());
+}
+
+// twos
+int __attribute__((noinline)) nativeC2() { return nativeTop2(); }
+
+int __attribute__((noinline)) nativeB2() { return nativeC2(); }
+
+JNIEXPORT void JNICALL Java_DemoJNI_nativeA2(JNIEnv *, jobject) {
+  printf("%d", nativeB2());
+}

java-jni/DemoJNI.java

@@ -0,0 +1,35 @@
+public class DemoJNI {
+
+    static {
+        System.loadLibrary("demo");
+    }
+
+    private native void nativeA1();
+    private native void nativeA2();
+
+    public void A1() {
+        B1();
+    }
+
+    public void A2() {
+        B2();
+    }
+
+    public void B1() {
+        nativeA1();
+    }
+
+    public void B2() {
+        nativeA2();
+    }
+
+    public static void main(String[] args) {
+        DemoJNI obj = new DemoJNI();
+        while (true) {
+            System.out.println("A1");
+            obj.A1();
+            System.out.println("B1");
+            obj.B1();
+        }
+    }
+}

java-jni/Dockerfile

@@ -0,0 +1,76 @@
+# TODO(kakkoyun): To do try jlinks
+FROM eclipse-temurin:19 as jre-build
+
+RUN $JAVA_HOME/bin/jlink \
+         --add-modules java.base \
+        #  --strip-debug \
+        #  --no-header-files \
+         --compress=2 \
+         --output /javaruntime
+
+# $java --list-modules
+# com.greetings
+# java.base@9
+# java.compiler@9
+# java.datatransfer@9
+# java.desktop@9
+# java.logging@9
+# java.management@9
+# java.management.rmi@9
+# java.naming@9
+# java.prefs@9
+# java.rmi@9
+# java.scripting@9
+# java.security.jgss@9
+# java.security.sasl@9
+# java.smartcardio@9
+# java.xml@9
+# java.xml.crypto@9
+# jdk.accessibility@9
+# jdk.charsets@9
+# jdk.compiler@9
+# jdk.crypto.cryptoki@9
+# jdk.crypto.ec@9
+# jdk.crypto.mscapi@9
+# jdk.deploy@9
+# jdk.dynalink@9
+# jdk.internal.opt@9
+# jdk.jartool@9
+# jdk.javadoc@9
+# jdk.jdeps@9
+# jdk.jlink@9
+# jdk.localedata@9
+# jdk.management@9
+# jdk.naming.dns@9
+# jdk.naming.rmi@9
+# jdk.scripting.nashorn@9
+# jdk.security.auth@9
+# jdk.security.jgss@9
+# jdk.unsupported@9
+# jdk.zipfs@9
+# [email protected]
+
+FROM eclipse-temurin:19-jdk as builder
+
+RUN apt-get update && apt-get install -y build-essential
+
+WORKDIR /app
+
+COPY DemoJNI.java DemoJNI.cpp Makefile ./
+
+RUN make compile
+
+# FROM eclipse-temurin:19-jre as runner
+FROM debian:buster-slim as runner
+
+ENV JAVA_HOME=/opt/java/openjdk
+ENV PATH "${JAVA_HOME}/bin:${PATH}"
+COPY --from=jre-build /javaruntime $JAVA_HOME
+
+COPY --from=builder /app/DemoJNI.class .
+COPY --from=builder /app/lib/libdemo.so /usr/lib
+
+# "-XX:+UnlockExperimentalVMOptions", "-XX:+UseContainerSupport", "-XX:+PreserveFramePointer",
+# "-agentpath:/app/libperfmap.so", "-Djava.security.egd=file:/dev/./urandom",
+# --XX:+DebugNonSafepoints
+CMD ["java", "-cp", ".", "-Djava.library.path=/usr/lib", "DemoJNI"]

java-jni/Makefile

@@ -0,0 +1,22 @@
+.PHONY: build
+build:
+	docker build -t parca-demo:java-jni .
+
+.PHONY: generate
+generate:
+	javac -h . DemoJNI.java
+
+.PHONY: compile
+compile: generate lib/libdemo.so
+
+lib/libdemo.so:
+	mkdir -p lib
+	g++ -g -fno-omit-frame-pointer -fPIC -I${JAVA_HOME}/include -I${JAVA_HOME}/include/linux DemoJNI.cpp -shared -o lib/libdemo.so
+
+.PHONY: run
+run: compile
+	java -cp . -Djava.library.path=./lib DemoJNI
+
+.PHONY: clean
+clean:
+	rm -rf lib/*.so DemoJNI.h *.o *.so *.class

java-jni/deployment.yaml

@@ -0,0 +1,24 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app.kubernetes.io/name: demo-java-jni
+  name: java
+  namespace: parca
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: demo-java-jni
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: demo-java-jni
+    spec:
+      containers:
+      - image: parca-demo:java-jni
+        name: java
+        resources:
+          limits:
+            cpu: '100m'
+            memory: '256Mi'

java/Dockerfile

@@ -1,7 +1,7 @@
 FROM gradle:7.3.3-jdk11 AS build
 COPY --chown=gradle:gradle . /home/gradle/src
 WORKDIR /home/gradle/src
-RUN gradle build --no-daemon 
+RUN gradle build --no-daemon
 
 FROM debian
 
@@ -14,4 +14,4 @@ RUN apt-get update && apt-get install -y openjdk-11-jre-headless openjdk-11-dbg
 COPY --from=build /home/gradle/src/build/libs/demo-0.0.1-SNAPSHOT.jar /app/demo.jar
 ADD https://github.com/parca-dev/perf-map-agent/releases/download/v0.0.1/libperfmap.so /app/libperfmap.so
 
-ENTRYPOINT ["java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseContainerSupport", "-XX:+PreserveFramePointer", "-agentpath:/app/libperfmap.so", "-Djava.security.egd=file:/dev/./urandom","-jar","/app/demo.jar"]
+ENTRYPOINT ["java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseContainerSupport", "-XX:+PreserveFramePointer", "-agentpath:/app/libperfmap.so", "-Djava.security.egd=file:/dev/./urandom", "-jar","/app/demo.jar"]

java/src/main/java/com/example/demo/Application.java

@@ -26,7 +26,6 @@ public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
 			for (String beanName : beanNames) {
 				System.out.println(beanName);
 			}
-
 		};
 	}