BAEL-5957: Creaet prime number finder for Kubernetes heap dump (#13190)

* BAEL-5957: Creaet prime number finder for Kubernetes heap dump

* add dockerfile, kubernetes deploy file

* use baeldung namespace

* add saving primes to a list

kubernetes-modules/k8s-java-heap-dump/Dockerfile

@@ -0,0 +1,5 @@
+FROM adoptopenjdk:11-jre-hotspot
+
+ARG JAR_FILE=target/*.jar
+COPY ${JAR_FILE} application.jar
+ENTRYPOINT ["java", "-jar", "application.jar"]

kubernetes-modules/k8s-java-heap-dump/pom.xml

@@ -0,0 +1,46 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>k8s-java-heap-dump</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>kubernetes-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <!-- http://maven.apache.org/plugins/maven-compiler-plugin/ -->
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>${maven-jar-plugin.version}</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>com.baeldung.kubernetes.heap.dump.PrimeNumberFinder</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <client-java.version>11.0.0</client-java.version>
+    </properties>
+
+</project>

kubernetes-modules/k8s-java-heap-dump/src/k8s/prime-deploy.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: prime-number-finder-pod
+spec:
+  containers:
+    - name: prime-number-finder
+      image: baeldung/prime-number:latest

kubernetes-modules/k8s-java-heap-dump/src/main/java/com/baeldung/kubernetes/heap/dump/PrimeNumberFinder.java

@@ -0,0 +1,24 @@
+package com.baeldung.kubernetes.heap.dump;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.IntStream;
+
+public class PrimeNumberFinder {
+    public static void main(String[] args) {
+        List<Integer> primes = new ArrayList<>();
+        int maxNumber = Integer.MAX_VALUE; // set to huge to make it run a long time
+
+        for (int i = 2; i < maxNumber; i++) {
+            if (isPrime(i)) {
+                System.out.println(i);
+                primes.add(i);
+            }
+        }
+    }
+
+    private static boolean isPrime(int number) {
+        return IntStream.rangeClosed(2, (int) (Math.sqrt(number)))
+                .allMatch(n -> number % n != 0);
+    }
+}

kubernetes-modules/pom.xml

@@ -16,6 +16,7 @@
         <module>k8s-intro</module>
         <module>k8s-admission-controller</module>
         <!-- <module>kubernetes-spring</module> --> <!-- JDK-11 Module -->
+        <module>k8s-java-heap-dump</module>
     </modules>
 
 </project>