add java sources, update dockerfiles

Author: cristiangreco

tools/docker-compose/docker-compose.yml

@@ -46,15 +46,24 @@ services:
       - 8082:8080
     networks:
       - phlare
-
   java-simple:
     build:
       context: java/simple
       dockerfile: Dockerfile
     cap_add:
       - SYS_ADMIN
     ports:
-      - 8083:8080
+      - 8083:4001
+    networks:
+      - phlare
+  java-springboot:
+    build:
+      context: java/springboot
+      dockerfile: Dockerfile
+    cap_add:
+      - SYS_ADMIN
+    ports:
+      - 8084:8080
     networks:
       - phlare
 

tools/docker-compose/java/simple/Dockerfile

@@ -1,13 +1,11 @@
-FROM openjdk:11-jdk-slim
-
-RUN apt-get install libstdc++6
+FROM openjdk:11-slim-bullseye
 
 WORKDIR /app
 
 COPY . .
 
 RUN ./gradlew clean build
 
-EXPOSE 8080
+EXPOSE 4001
 
-CMD ["./gradlew","run"]
+CMD ["./gradlew", "run"]

tools/docker-compose/java/simple/src/main/java/Main.java

@@ -0,0 +1,19 @@
+package com.example;
+
+import java.net.InetSocketAddress;
+import com.sun.net.httpserver.HttpServer;
+import jpprof.PprofHttpHandler;
+
+public class Main {
+
+    public static void main(String[] args) throws Exception {
+        // run some background worload
+        var t = new Thread(new Something());
+        t.start();
+
+        var server = HttpServer.create(new InetSocketAddress(4001), 0);
+        server.createContext("/", new PprofHttpHandler());
+        server.start();
+    }
+
+}

tools/docker-compose/java/simple/src/main/java/Something.java

@@ -0,0 +1,57 @@
+package com.example;
+
+import java.io.File;
+import java.io.FileWriter;
+
+public class Something extends Thread {
+
+    public Something() {
+        super();
+    }
+
+    @Override
+    public void run() {
+        doSomething();
+    }
+
+    private static void doSomething() {
+        int i = 0;
+        for (;;) {
+            i++;
+            if (i % 3 == 0) {
+                funcFoo();
+            }
+            funcBar();
+        }
+    }
+
+    private static void funcFoo() {
+        funcBuzz();
+    }
+
+    private static void funcBar() {
+        funcBaz();
+    }
+
+    private static void funcBaz() {
+        try {
+            File f = File.createTempFile("foo", "bar");
+            FileWriter w = new FileWriter(f);
+            w.write("hello");
+            w.close();
+            f.delete();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    private static void funcBuzz() {
+        try {
+            File.listRoots();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+}

tools/docker-compose/java/springboot/Dockerfile

@@ -0,0 +1,11 @@
+FROM openjdk:11-slim-bullseye
+
+WORKDIR /app
+
+COPY . .
+
+RUN ./gradlew clean build
+
+EXPOSE 8080
+
+CMD ["./gradlew", "bootRun"]

tools/docker-compose/java/springboot/src/main/java/com/example/springboot/Application.java

@@ -0,0 +1,18 @@
+package com.example.springboot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		// run some background worload
+		Thread t = new Thread(new Something());
+		t.start();
+
+		ApplicationContext ctx = SpringApplication.run(Application.class, args);
+	}
+
+}

tools/docker-compose/java/springboot/src/main/java/com/example/springboot/HelloController.java

@@ -0,0 +1,14 @@
+package com.example.springboot;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HelloController {
+
+	@GetMapping("/")
+	public String index() {
+		return "Greetings from Spring Boot!";
+	}
+
+}

tools/docker-compose/java/springboot/src/main/java/com/example/springboot/PprofController.java

@@ -0,0 +1,29 @@
+package com.example.springboot;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.time.Duration;
+
+import jpprof.CPUProfiler;
+
+@RestController
+public class PprofController {
+
+  @GetMapping("/debug/pprof/profile")
+  @ResponseBody
+  public void profile(@RequestParam(required = false) String seconds, HttpServletResponse response) {
+    try {
+      Duration d = Duration.ofSeconds(Integer.parseInt(seconds));
+      CPUProfiler.start(d, response.getOutputStream());
+      response.flushBuffer();
+    } catch (Exception e) {
+      System.out.println("exception: " + e.getMessage());
+    }
+  }
+
+}

tools/docker-compose/java/springboot/src/main/java/com/example/springboot/Something.java

@@ -0,0 +1,57 @@
+package com.example.springboot;
+
+import java.io.File;
+import java.io.FileWriter;
+
+public class Something extends Thread {
+
+    public Something() {
+        super();
+    }
+
+    @Override
+    public void run() {
+        doSomething();
+    }
+
+    private static void doSomething() {
+        int i = 0;
+        for (;;) {
+            i++;
+            if (i % 3 == 0) {
+                funcFoo();
+            }
+            funcBar();
+        }
+    }
+
+    private static void funcFoo() {
+        funcBuzz();
+    }
+
+    private static void funcBar() {
+        funcBaz();
+    }
+
+    private static void funcBaz() {
+        try {
+            File f = File.createTempFile("foo", "bar");
+            FileWriter w = new FileWriter(f);
+            w.write("hello");
+            w.close();
+            f.delete();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    private static void funcBuzz() {
+        try {
+            File.listRoots();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+}