Java byte code in practice

I am listening to Rafael on Virtual JUG

Screen Shot 2015-05-20 at 10.27.03 am

‘mvn package’ through our debilitating NTLM proxy

I was morose, grief-stricken and close to tears when our evil corporate proxy stopped me from doing anything. Each tool needs a different type of parameters to pass through this proxy. I tried to use cntlm but that did not help. After many hours I realized that this settings.xml builds everything properly.

There are two proxy sections but I have not attempted to remove one. It is working as it is.

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                          http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <activeProfiles>
    <!--make the profile active all the time -->
    <activeProfile>securecentral</activeProfile>
  </activeProfiles>
  <profiles>
    <profile>
      <id>securecentral</id>
      <!--Override the repository (and pluginRepository) "central" from the
         Maven Super POM -->
      <repositories>
        <repository>
          <id>central</id>
          <url>http://repo1.maven.org/maven2</url>
          <releases>
            <enabled>true</enabled>
          </releases>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>central</id>
          <url>http://repo1.maven.org/maven2</url>
          <releases>
            <enabled>true</enabled>
          </releases>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <name>Maven Plugin Repository</name>
      <url>http://repo1.maven.org/maven2</url>
      <layout>default</layout>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
    </pluginRepository>
  </pluginRepositories>
  <proxies>
    <proxy>
      <id>example-proxy</id>
      <active>true</active>
      <protocol>http</protocol>
      <host>proxy</host>
      <port>port</port>
      <username>user</username>
      <password>password</password>
      <nonProxyHosts>www.google.com|*.example.com</nonProxyHosts>
    </proxy>
    <proxy>
      <id>example-proxy</id>
      <active>true</active>
      <protocol>https</protocol>
      <host>proxy</host>
      <port>port</port>
      <username>user</username>
      <password>password</password>
      <nonProxyHosts>www.google.com|*.example.com</nonProxyHosts>
    </proxy>
  </proxies>
</settings>

JDK9 REPL

I have been building and quickly exploring various JDK 9 features during this past weekend.
There is a new REPL now among other gems. I will update this post as I explore it further.

Mohans-MacBook-Pro:openjdk radhakrishnan$ java -version
java version “1.9.0-ea”
Java(TM) SE Runtime Environment (build 1.9.0-ea-b61)
Java HotSpot(TM) 64-Bit Server VM (build 1.9.0-ea-b61, mixed mode)
Mohans-MacBook-Pro:openjdk radhakrishnan$ java -jar kulla-0.508-20150510054454.jar
| Welcome to JShell — Version 0.508
| Type /help for help

->

-> String s = “__mainn__”.replaceAll(“[^a-z\\s]”, “”);
| Added variable s of type String with initial value “mainn”

-> System.out.println(s);

-> mainn

-> final Map count = s.chars().map(Character::toLowerCase).collect(TreeMap::new, (m, c) -> m.merge((char) c, 1, Integer::sum), Map::putAll);
| Warning:
| Modifier ‘final’ not permitted in top-level declarations, ignored
| final Map count = s.chars().map(Character::toLowerCase).collect(TreeMap::new, (m, c) -> m.merge((char) c, 1, Integer::sum), Map::putAll);
| ^—^
| Added variable count of type Map with initial value {a=1, i=1, m=1, n=2}

-> int x = 26;
| Added variable x of type int with initial value 26

-> count.entrySet().stream().sorted((l, r) -> r.getValue().compareTo(l.getValue())).forEach(e -> count.merge(e.getKey(), x–, Math::multiplyExact));

-> System.out.println(count.entrySet().stream());
java.util.
-> stream.ReferencePipeline$Head@548a9f61

-> System.out.println(count.entrySet().stream().mapToDouble(e -> e.getValue()).sum());
124.0

Everything can be changed in the REPL. Nothing is final and it is ignored. That is what kulla-dev@openjdk.java.net told me.

Resolution for MacOS issue related to freetype

A new pull request is submitted.

git clone http://github.com/mohanr/adoptopenjdk-getting-started-kit.git

cd adoptopenjdk-getting-started-kit

git remote add upstream https://github.com/neomatrix369/adoptopenjdk-getting-started-kit.git

git fetch upstream

From https://github.com/neomatrix369/adoptopenjdk-getting-started-kit
* [new branch] Nashorn -> upstream/Nashorn
* [new branch] master -> upstream/master
Mohans-MacBook-Pro:adoptopenjdk-getting-started-kit radhakrishnan$ ls
LANGS.md cover.jpg cover_small.jpg en pt
Mohans-MacBook-Pro:adoptopenjdk-getting-started-kit radhakrishnan$ cd pt
Mohans-MacBook-Pro:pt radhakrishnan$ ls
AdoptOpenJDKLogo-100×100.png feedback.md
README.md handy-scripts-for-OpenJDK-developers.md
SUMMARY.md intermediate-steps
adopt-openjdk-getting-started known-issues
adoptopenjdk-projects openjdk-mailing-lists.md
advanced-steps openjdk-projects
binaries preparations.md
contribute.md source-code
contributors.md thanks_and_support.md
cover.jpg virtual-machines
Mohans-MacBook-Pro:pt radhakrishnan$ cd known-issues/
Mohans-MacBook-Pro:known-issues radhakrishnan$ ls
known_issues.md known_issues_sonarqube.md
known_issues_linuxunix.md known_issues_virtual_machine.md
known_issues_macos.md known_issues_windows.md
known_issues_mercurial.md
Mohans-MacBook-Pro:known-issues radhakrishnan$ cat known_issues_macos.md
# MacOS

The configuration fails because it does not find **freetype

configure: error: Could not find freetype!
configure exiting with result code 1

Check if **freetype** is installed

$ brew install freetype
Error: freetype-2.5.3_1 already installed
To install this version, first `brew unlink freetype’

Since it is already installed we configure like this.

$ bash configure –with-freetype-include=/usr/X11/include/freetype2 –with-freetype-lib=/usr/X11/lib
A new configuration has been successfully created in
/Users/radhakrishnan/OpenJDK/jdk9/build/macosx-x86_64-normal-server-release
using configure arguments ‘–with-freetype-include=/usr/X11/include/freetype2 –with-freetype-lib=/usr/X11/lib’.
Mohans-MacBook-Pro:known-issues radhakrishnan$ git commit -m “Resolution for MacOS issue related to freetype” known_issues_macos.md
[master 9173bc0] Resolution for MacOS issue related to freetype
1 file changed, 18 insertions(+)
Mohans-MacBook-Pro:known-issues radhakrishnan$ git push origin master
Counting objects: 10, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (5/5), done.
Writing objects: 100% (5/5), 786 bytes | 0 bytes/s, done.
Total 5 (delta 3), reused 0 (delta 0)
To http://github.com/mohanr/adoptopenjdk-getting-started-kit.git
6f1c9e0..9173bc0 master -> master

Build OpenJDK 9

The build was delayed by this error.

configure: error: Could not find freetype!
configure exiting with result code 1

It is already installed !!

localhost:jdk9 radhakrishnan$ brew install freetype

Error: freetype-2.5.3_1 already installed

To install this version, first `brew unlink freetype’

This helped.

Mohans-MacBook-Pro:jdk9 radhakrishnan$ bash configure –with-freetype-include=/usr/X11/include/freetype2 –with-freetype-lib=/usr/X11/lib

A new configuration has been successfully created in

/Users/radhakrishnan/OpenJDK/jdk9/build/macosx-x86_64-normal-server-release

using configure arguments ‘–with-freetype-include=/usr/X11/include/freetype2 –with-freetype-lib=/usr/X11/lib’.

Configuration summary:

* Debug level: release

* HS debug level: product

* JDK variant: normal

* JVM variants: server

* OpenJDK target: OS: macosx, CPU architecture: x86, address length: 64

Tools summary:

* Boot JDK: java version “1.8.0_45” Java(TM) SE Runtime Environment (build 1.8.0_45-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode) (at /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home)

* Toolchain: clang (clang/LLVM)

* C Compiler: Version Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn) Target: x86_64-apple-darwin13.4.0 Thread model: posix (at /usr/bin/clang)

* C++ Compiler: Version Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn) Target: x86_64-apple-darwin13.4.0 Thread model: posix (at /usr/bin/clang++)

—– Build times ——-
Start 2015-04-26 08:23:02
End 2015-04-26 08:45:01
00:05:54 verify-modules
00:21:59 TOTAL
————————-
/bin/bash /Users/radhakrishnan/OpenJDK/jdk9/common/bin/logger.sh /Users/radhakrishnan/OpenJDK/jdk9/build/macosx-x86_64-normal-server-release/build.log /usr/bin/printf “Finished building targets ‘clean images’ in configuration ‘macosx-x86_64-normal-server-release’\n”
Finished building targets ‘clean images’ in configuration ‘macosx-x86_64-normal-server-release’

Deployment on Heroku

 

Screen Shot 2014-12-05 at 12.50.10 PM I recently pushed my AngularJS/Spring Boot/Rest application to Heroku.

buildscript {
    repositories {
        maven { url "http://repo.spring.io/libs-release" }
        mavenLocal()
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.1.8.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'
mainClassName = "rest.controller.Application"

jar {
    baseName = 'Angular-Boot-Rest'
    version =  '0.1.0'
}

repositories {
    mavenLocal()
    mavenCentral()
    maven { url "http://repo.spring.io/libs-release" }
}



tasks.withType(Copy) {
        eachFile { println it.file }
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web")
    testCompile("junit:junit")
}

task wrapper(type: Wrapper) {
    gradleVersion = '1.11'
}
task stage(dependsOn: ["build"]){}

I added a new task stage and mainClassName.

It allots a free port on which Tomcat binds. If one specified one’s own port then the application does not bind to it within 60 seconds which is the time limit allowed.

Heroku needs this file too.

Procfile

web: java $JAVA_OPTS -jar target/Angular-Boot-Rest.jar

This is the screenshot. Note the URL which is allotted too.

Screen Shot 2014-12-05 at 1.02.05 PM

Web application stack

resthub
RestHUB

jhipster
JHipster

I really need to keep up with these new stacks.