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FROM openjdk:8
WORKDIR /app
ENV JAVA_TOOL_OPTIONS -agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n
COPY remote-debugging-1.0-SNAPSHOT.jar  remote-debugging.jar
ENTRYPOINT ["java", "-cp", "remote-debugging.jar", "com.kaysush.App"]

AravindaM

import java.io.IOException;
import java.net.URISyntaxException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;

AravindaM

Enable native memory tracking in JVM by specifying the following flag

-XX:NativeMemoryTracking=detail

Know the <PID> of the java process

jps

To print ps based RSS

ps -p <PID> -o pcpu,rss,size,vsize

To print native memory tracking summary

AravindaM

Node.js TLS plain TLS sockets

This guide shows how to set up a bidirectional client/server authentication for plain TLS sockets.

Prepare certificates

Generate a Certificate Authority:

openssl req -new -x509 -days 9999 -keyout ca-key.pem -out ca-crt.pem

AravindaM

The repository for the assignment is public and Github does not allow the creation of private forks for public repositories.

The correct way of creating a private frok by duplicating the repo is documented here.

For this assignment the commands are:

1. Create a bare clone of the repository. (This is temporary and will be removed so just do it wherever.)

git clone --bare git@github.com:usi-systems/easytrace.git

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### KERNEL TUNING ###

# Increase size of file handles and inode cache
fs.file-max = 2097152

# Do less swapping
vm.swappiness = 10
vm.dirty_ratio = 60
vm.dirty_background_ratio = 2

AravindaM

# Inspired from http://blog.akquinet.de/2010/05/26/mastering-the-maven-command-line-%E2%80%93-reactor-options/

# Build only specific modules:
mvn clean install -pl sub-module-name2
mvn clean install -pl sub-module-name2,sub-module-name3

# Build only starting from specific sub-module (resume from)
mvn clean install -rf sub-module-name2

# Build dependencies (also make)

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import play.api.libs.ws.ahc.AhcWSClient
import akka.stream.ActorMaterializer
import akka.actor.ActorSystem

implicit val system = ActorSystem()
implicit val materializer = ActorMaterializer()
val ws = AhcWSClient()

val req = ws.url("http://example.com").get().map{
  resp => resp.body

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package com.scalawilliam.example.play

import play.api.libs.ws._

/**
 * Play's Scala WS library is very very cool. Provides you with plenty niceties.
 * See more: https://www.playframework.com/documentation/2.3.x/ScalaWS
 *
 * Unfortunately it by default requires a Play application context.
 * But you do not necessarily always want that.

AravindaM

package com.semperos.example


import org.apache.http.impl.client.{BasicResponseHandler, DefaultHttpClient}
import org.apache.http.{HttpRequest, HttpRequestInterceptor}
import org.apache.http.client.methods.HttpGet
import org.apache.http.protocol.HttpContext
import org.apache.log4j.Logger

/**