Examine the system information of AWS Lambda operating environment in Java


--Run Java programs on AWS Lambda and output system properties and environment variables

Source code

File list

├── pom.xml
└── src
    └── main
        └── java
            └── com
                └── example
                    └── SystemInfo.java


package com.example;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;

public class SystemInfo implements RequestHandler<Map<String, Object>, Map<String, Object>> {

   *Entry point when executing AWS Lambda function(Handler method)is.
   * @param input input data
   * @param context AWS Lambda Context object
   * @return output data
  public Map<String, Object> handleRequest(Map<String, Object> input, Context context) {

    Map<String, String> time = new HashMap<String, String>();
    DateTimeFormatter format = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
    time.put("jst", LocalDateTime.now(ZoneId.of("JST", ZoneId.SHORT_IDS)).format(format));
    time.put("est", LocalDateTime.now(ZoneId.of("EST", ZoneId.SHORT_IDS)).format(format));
    time.put("system", LocalDateTime.now(ZoneId.systemDefault()).format(format));

    //Get system information
    Map output = new HashMap<String, Object>();
    output.put("system", System.getProperties());
    output.put("env", System.getenv());
    output.put("time", time);
    return output;


<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">



    <!-- https://mvnrepository.com/artifact/com.amazonaws/aws-lambda-java-core -->

      <!-- https://maven.apache.org/plugins/maven-shade-plugin/ -->


Generate a JAR file

Generate a JAR file with Maven.

$ mvn package

A JAR file called systeminfo-1.0.jar will be generated in the target directory, and you can deploy (upload) it to a function in AWS Lambda.

Example of execution result on AWS Lambda + Java 8

  "system": {
    "java.runtime.name": "OpenJDK Runtime Environment",
    "sun.boot.library.path": "/usr/lib/jvm/java-1.8.0-openjdk-",
    "java.vm.version": "25.201-b09",
    "java.vm.vendor": "Oracle Corporation",
    "java.vendor.url": "http://java.oracle.com/",
    "path.separator": ":",
    "java.vm.name": "OpenJDK 64-Bit Server VM",
    "file.encoding.pkg": "sun.io",
    "user.country": "US",
    "sun.java.launcher": "SUN_STANDARD",
    "sun.os.patch.level": "unknown",
    "java.vm.specification.name": "Java Virtual Machine Specification",
    "user.dir": "/",
    "java.runtime.version": "1.8.0_201-b09",
    "java.awt.graphicsenv": "sun.awt.X11GraphicsEnvironment",
    "java.endorsed.dirs": "/usr/lib/jvm/java-1.8.0-openjdk-",
    "os.arch": "amd64",
    "java.io.tmpdir": "/tmp",
    "line.separator": "\n",
    "java.vm.specification.vendor": "Oracle Corporation",
    "os.name": "Linux",
    "sun.jnu.encoding": "UTF-8",
    "java.library.path": "/lib64:/usr/lib64:/var/runtime:/var/runtime/lib:/var/task:/var/task/lib:/opt/lib:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib",
    "java.specification.name": "Java Platform API Specification",
    "java.class.version": "52.0",
    "java.net.preferIPv4Stack": "true",
    "sun.management.compiler": "HotSpot 64-Bit Tiered Compilers",
    "os.version": "4.14.133-97.112.amzn2.x86_64",
    "user.home": "/home/sbx_user1051",
    "user.timezone": "UTC",
    "java.awt.printerjob": "sun.print.PSPrinterJob",
    "file.encoding": "UTF-8",
    "java.specification.version": "1.8",
    "java.class.path": "/var/runtime/lib/LambdaJavaRTEntry-1.0.jar",
    "user.name": "sbx_user1051",
    "java.vm.specification.version": "1.8",
    "sun.java.command": "/var/runtime/lib/LambdaJavaRTEntry-1.0.jar",
    "java.home": "/usr/lib/jvm/java-1.8.0-openjdk-",
    "sun.arch.data.model": "64",
    "user.language": "en",
    "java.specification.vendor": "Oracle Corporation",
    "awt.toolkit": "sun.awt.X11.XToolkit",
    "java.vm.info": "mixed mode, sharing",
    "java.version": "1.8.0_201",
    "java.ext.dirs": "/usr/lib/jvm/java-1.8.0-openjdk-",
    "sun.boot.class.path": "/usr/lib/jvm/java-1.8.0-openjdk-",
    "java.vendor": "Oracle Corporation",
    "file.separator": "/",
    "java.vendor.url.bug": "http://bugreport.sun.com/bugreport/",
    "sun.io.unicode.encoding": "UnicodeLittle",
    "sun.cpu.endian": "little",
    "sun.cpu.isalist": ""
  "time": {
    "system": "2019/09/01 06:08:39",
    "est": "2019/09/01 01:08:39",
    "jst": "2019/09/01 15:08:39"
  "env": {
    "PATH": "/usr/local/bin:/usr/bin/:/bin:/opt/bin",
    "LAMBDA_TASK_ROOT": "/var/task",
    "TZ": ":UTC",
    "AWS_EXECUTION_ENV": "AWS_Lambda_java8",
    "AWS_DEFAULT_REGION": "ap-northeast-1",
    "AWS_LAMBDA_LOG_GROUP_NAME": "/aws/lambda/mySystemInfo",
    "_HANDLER": "com.example.SystemInfo::handleRequest",
    "LANG": "en_US.UTF-8",
    "LAMBDA_RUNTIME_DIR": "/var/runtime",
    "LD_LIBRARY_PATH": "/lib64:/usr/lib64:/var/runtime:/var/runtime/lib:/var/task:/var/task/lib:/opt/lib",
    "AWS_REGION": "ap-northeast-1",
    "_AWS_XRAY_DAEMON_PORT": "2000",
    "AWS_LAMBDA_FUNCTION_NAME": "mySystemInfo"

Reference material

-AWS Lambda Runtime -AWS Lambda -Environment variables that can be used with Lambda functions -AWS Lambda

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