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Philippe Soares
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#BAEL-4654 (eugenp#10450)
* #BAEL-4654 * Fixing PR comments.
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‎docker/heap-sizing/Dockerfile‎

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FROM openjdk:8u92-jdk-alpine
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COPY /src /src/
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RUN mkdir /app && ls /src && javac /src/main/java/com/baeldung/docker/heapsizing/PrintXmxXms.java -d /app
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CMD java -version && java $JAVA_OPTS -cp /app com.baeldung.docker.heapsizing.PrintXmxXms

‎docker/heap-sizing/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.4.2</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.baeldung.docker</groupId>
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<artifactId>heap-sizing</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>heap-sizing</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>11</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-webflux</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>io.projectreactor</groupId>
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<artifactId>reactor-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<configuration>
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<image>
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<name>heapsizing-demo</name>
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</image>
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</configuration>
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</plugin>
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<plugin>
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<groupId>com.google.cloud.tools</groupId>
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<artifactId>jib-maven-plugin</artifactId>
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<version>2.7.1</version>
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<configuration>
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<to>
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<image>heapsizing-demo-jib</image>
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</to>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎docker/heap-sizing/src/main/java/com/baeldung/docker/heapsizing/HeapSizingApplication.java‎

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package com.baeldung.docker.heapsizing;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import java.util.logging.Logger;
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import static com.baeldung.docker.heapsizing.PrintXmxXms.logMemory;
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@SpringBootApplication
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public class HeapSizingApplication {
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private static final Logger logger = Logger.getLogger(HeapSizingApplication.class.getName());
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public static void main(String[] args) {
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SpringApplication.run(HeapSizingApplication.class, args);
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logMemory(logger);
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}
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}

‎docker/heap-sizing/src/main/java/com/baeldung/docker/heapsizing/PrintXmxXms.java‎

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package com.baeldung.docker.heapsizing;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryMXBean;
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import java.lang.management.MemoryPoolMXBean;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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public class PrintXmxXms {
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private static final Logger logger = Logger.getLogger(PrintXmxXms.class.getName());
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public static void main(String[] args) {
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logMemory(logger);
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}
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/**
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* We're reusing this method in HeapSizingApplication, therefore this method was extracted
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* to avoid repetition.
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*/
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static void logMemory(Logger logger) {
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float mb = 1024f * 1024f;
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MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();
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// xmx controls the maximum size of the memory allocation pool,
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// which includes the heap, the garbage collector's survivor space, and other pools.
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float xmx = memoryBean.getHeapMemoryUsage().getMax() / mb;
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float xms = memoryBean.getHeapMemoryUsage().getInit() / mb;
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logger.log(Level.INFO, "Initial Memory (xms) : {0}mb", xms);
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logger.log(Level.INFO, "Max Memory (xmx) : {0}mb", xmx);
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for (MemoryPoolMXBean mp : ManagementFactory.getMemoryPoolMXBeans()) {
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logger.log(Level.INFO, "Pool: {0} (type {1}) = {2}", new Object[]{ mp.getName(), mp.getType(), mp.getUsage().getMax() / mb });
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}
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}
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}

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