Linux Commands in a nutshell

Go back to the previous directory in shell

cd -

It goes back to the previous directory.

cd $OLDPWD

This can be also used in shell scripts.

Difference between dependencies within buildscript closure and core?

I want to give you clear conception. For this reason, I am attaching build.grade snapshot code for better understanding.

buildscript {
    repositories {
        maven { url("https://plugins.gradle.org/m2/") }
    }

    dependencies {
        classpath 'net.saliman:gradle-cobertura-plugin:2.3.2'
        classpath 'com.netflix.nebula:gradle-lint-plugin:latest.release'
    }
}

repositories{
    mavenLocal()
    maven { url("https://plugins.gradle.org/m2/") }
    maven { url "https://repo.spring.io/snapshot" }
}

dependencies {
        //Groovy
        compile group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.3.10'

        //Spock Test
        compile group: 'org.spockframework', name: 'spock-core', version: '1.0-groovy-2.3'

        //Test
        testCompile group: 'junit', name: 'junit', version: '4.10'
        testCompile group: 'org.testng', name: 'testng', version: '6.8.5'
}

So, First I want to clarify in single word that

i) buildscript dependencies jar file will be downloaded from buildscript repositories.[Project external dependency]

ii) root level dependencies jar file will be downloaded from root level repositories.[For project dependency]

Here,

The “buildscript” block only controls dependencies for the buildscript process itself, not for the application code. As various gradle plugin like gradle-cobertura-plugin, gradle-lint-pluginare found from buildscript repos. Those plugins would not be referenced as dependencies for the application code.

But for project compilation and test running jar files like groovy all jar, junit and testng jarwill be found from root level repositories.

And another thing, maven { url("https://plugins.gradle.org/m2/") } portion can be used in both blocks. Because they are used for different dependencies.

Resource Link: Difference between dependencies within buildscript closure and core

EUC-JP conversion in PHP

1. http://php.net/manual/en/function.mb-convert-encoding.php

Great words

1. Fear is just state of mind.

gradle lint plugin to remove unused dependencies

In parent project,  Add the following code in build.gradle or init.gradle

buildscript {
repositories { maven { url("https://plugins.gradle.org/m2/") } }
dependencies {
classpath 'com.netflix.nebula:gradle-lint-plugin:latest.release'
}
}
plugins {
id 'java'
id 'groovy'
id 'maven'
id 'jacoco'
id 'application'
id 'nebula.lint' version '7.4.0'
}
allprojects {
  apply plugin: 'nebula.lint'
  gradleLint.rules = ['unused-dependency']
}

Then run the following command:

gradle lintGradle
gradle fixGradleLint
gradle compileJava fixGradleLint

1. https://github.com/nebula-plugins/gradle-lint-plugin/issues/38
2. https://stackoverflow.com/a/25525390
3. https://discuss.gradle.org/t/task-run-not-found-in-root-project/12130/3
4. https://github.com/wfhartford/gradle-dependency-analyze
5. https://www.youtube.com/watch?v=0ZS_bqD1dkg

How to write high quality code?

Prohibited in coding(Haram Programming). Check if you are doing any of these.

•Writing a large function with even larger classes: Keep you functions below 30 line and you class below 200 lines. •Storing password in plain text in database: Always hash with a salt. Don't use MD5, it's compromised. •Returning a list from the server without paging: Use a page number and page size parameter. •Sorting or searching on the client side: Otherwise its sorts the current page only. •Querying more columns than needed: Slows down the query and increase data transfer to the client. •Not Indexing the Database: Makes your query super slow. •Not logging on Server side code: Without log when you code is deployed you will have no way to know what went wrong. Use a logging framework. •Not using dependency injection: Ensures decoupled maintainable architecture. •Not using source control: You cannot collaborate, leaves you at the mercy of your HDD. •Not localizing UI text: Makes your life hell when the customer says he needs it in German.

Collected from Linkedin post of Topu Newaz Sir:

Memory Analyzer Tool Details

https://stackoverflow.com/questions/185893/how-do-i-analyze-a-hprof-file
http://www.eclipse.org/mat/
http://www.vogella.com/tutorials/EclipseMemoryAnalyzer/article.html
http://2min2code.com/articles/eclipse_memory_analyzer

https://www.programcreek.com/java-api-examples/index.php?class=java.util.concurrent.CompletableFuture&method=allOf
https://stackoverflow.com/questions/35809827/java-8-completablefuture-allof-with-collection-or-list
https://stackoverflow.com/questions/30025428/listfuture-to-futurelist-sequence

If you were to build your own product, how would you measure its success?

Success depends on goal within fixed time limit.

If I am a product manager and have responsibility to make a new product, I must follow the Agile methodologies with XP.

Difference between a Developer or a Product Engineer?

Product Engineer is capable to deliver the end goal[a product] having much or less knowledge on it, but highly capable to adopt it within a short time and capable to give the quality product.

On the other hand, A Developer tends to be more creatively minded who can apply various patterns and practices. He can learn through self-discovery, on the job, reading books and blogs, or courses. He must be focused on specific aspects of the development life-cycle through R&D.

Debug point in Eclipse going in .class file

1. https://stackoverflow.com/questions/35250532/debug-point-in-eclipse-going-in-class-file

Cannot load settings from file

1. https://stackoverflow.com/questions/25507998/intellij-idea-crashed-and-now-throws-an-error

How to run only one test class on gradle?

1. https://stackoverflow.com/questions/22505533/how-to-run-only-one-test-class-on-gradle

101 Greatest George Carlin Quotes

The man who once said “life is worth losing” is dead. But his quotes live on. In no particular order here are his 101 best…

1. I don’t have pet peeves — I have major psychotic fucking hatreds!
2. Think of how stupid the average person is, and realize half of them are stupider than that.
3. Swimming is not a sport. Swimming is a way to keep from drowning. That’s just common sense!
4. A house is just a place to keep your stuff while you go out and get more stuff.
5. Have you ever noticed that their stuff is shit and your shit is stuff?
6. I wanna live. I don’t wanna die. That’s the whole meaning of life: Not dying! I figured that shit out by myself in the third grade.
7. I used to be Irish Catholic. Now I’m an American — you know, you grow.
8. You can’t fight City Hall, but you can goddamn sure blow it up.
9. If the Cincinnati Reds were really the first major league baseball team, who did they play?
10. Honesty may be the best policy, but it’s important to remember that apparently, by elimination, dishonesty is the second-best policy.
11. If it’s true that our species is alone in the universe, then I’d have to say that the universe aimed rather low and settled for very little.
12. No one knows what’s next, but everybody does it.
13. There are 400,000 words in the English language, and there are seven you can’t say on television. What a ratio that is! 399,993 to 7. They must really be baaaad. They must be OUTRAGEOUS to be separated from a group that large. “All of you words over here, you seven….baaaad words.” That’s what they told us, right? …You know the seven, don’t ya? That you can’t say on TV? Shit, piss, fuck, cunt, cocksucker, motherfucker and tits.
14. The very existence of flamethrowers proves that sometime, somewhere, someone said to themselves, “You know, I want to set those people over there on fire, but I’m just not close enough to get the job done.”
15. The reason I talk to myself is because I’m the only one whose answers I accept.
16. Just when I discovered the meaning of life, they changed it.
17. Religion has convinced people that there’s an invisible man…living in the sky, who watches everything you do every minute of every day. And the invisible man has a list of ten specific things he doesn’t want you to do. And if you do any of these things, he will send you to a special place, of burning and fire and smoke and torture and anguish for you to live forever, and suffer and burn and scream until the end of time. But he loves you. He loves you and he needs money.
18. Weather forecast for tonight: Dark. Continued dark overnight, with widely scattered light by morning.
19. If it requires a uniform, it’s a worthless endeavor.
20. If you live long enough, sooner or later everybody you know has cancer.
21. You know the good part about all those executions in Texas? Fewer Texans.
22. Soft rock music isn’t rock, and it ain’t music. It’s just soft.
23. Reminds me of something my third-grade teacher said to us. She said, “You show me a tropical fruit and I’ll show you a cocksucker from Guatemala.”
24. As soon as someone is identified as an unsung hero, he no longer is.
25. If a movie is described as a romantic comedy, you can usually find me next door playing pinball.
26. The IQ and the life expectancy of the average American recently passed each other in opposite directions.
27. I knew a transsexual guy whose only ambition is to eat, drink, and be Mary.
28. I put a dollar in a change machine. Nothing changed.
29. If you’ve got a cat and a leg, you’ve got a happy cat. If you’ve got a cat and two legs, you’ve got a party.
30. You can prick your finger — just don’t finger your prick.
31. By and large, language is a tool for concealing the truth.
32. Ever notice that anyone going slower than you is an idiot, but anyone going faster is a maniac?
33. Isn’t it a bit unnerving that doctors call what they do “practice”?
34. I don’t like to think of laws as rules you have to follow, but more as suggestions.
35. I think it’s the duty of the comedian to find out where the line is drawn and cross it deliberately.
36. When you’re born you get a ticket to the freak show. When you’re born in America, you get a front-row seat.
37. Eventually, alas, I realized the main purpose of buying cocaine is to run out of it.
38. I never fucked a ten, but one night, I fucked five twos.
39. I never joined the Boy Scouts. I don’t trust any organization that has a handbook.
40. I would never want to be a member of a group whose symbol was a man nailed to two pieces of wood.
41. Have you noticed that most of the women who are against abortion are women you wouldn’t want to fuck in the first place? There’s such balance in nature.
42. So I say, “Live and let live.” That’s my motto. “Live and let live.” Anyone who can’t go along with that, take him outside and shoot the motherfucker. It’s a simple philosophy, but it’s always worked in our family.
43. Catholic — which I was until I reached the age of reason.
44. Here’s a bumper sticker I’d like to see: “We are the proud parents of a child who’s self-esteem is sufficient that he doesn’t need us promoting his minor scholastic achievements on the back of our car.”
45. I love and treasure individuals as I meet them; I loathe and despise the groups they identify with and belong to.
46. Beethoven was so hard of hearing, he thought he was a painter.
47. Don Ho can sign autographs 3.4 times faster than Efrem Zimbalist Jr.
48. God bless the homicidal maniacs. They make life worthwhile.
49. I’ve never seen a homeless guy with a bottle of Gatorade.
50. One great thing about getting old is that you can get out of all sorts of social obligations just by saying you’re too tired.
51. If Helen Keller had psychic ability, would you say she had a fourth sense?
52. What year did Jesus think it was?
53. George Washington’s brother, Lawrence, was the Uncle of Our Country.
54. Have you ever wondered why Republicans are so interested in encouraging people to volunteer in their communities? It’s because volunteers work for no pay. Republicans have been trying to get people to work for no pay for a long time.
55. In America, anyone can become president. That’s the problem.
56. Once you leave the womb, conservatives don’t care about you until you reach military age. Then you’re just what they’re looking for. Conservatives want live babies so they can raise them to be dead soldiers.
57. “One thing leads to another”? Not always. Sometimes one thing leads to the same thing. Ask an addict.
58. No one who has had “Taps” played for them has ever been able to hear it.
59. Property is theft. Nobody “owns” anything. When you die, it all stays here.
60. The best thing about living at the water’s edge: You only have assholes on three sides of you, and if they come this way you can hear them splash.
61. The future will soon be a thing of the past.
62. The planet is fine. The people are fucked.
63. The real reason that we can’t have the Ten Commandments in a courthouse: You cannot post “Thou shalt not steal,” “Thou shalt not commit adultery,” and “Thou shalt not lie” in a building full of lawyers, judges, and politicians. It creates a hostile work environment.
64. Boxing is a more sophisticated form of hockey.
65. The only good thing ever to come out of religion was the music.
66. I think everyone should treat one another in a Christian manner. I will not, however, be responsible for the consequences.
67. Bowling is not a sport because you have to rent the shoes.
68. “When Will Jesus Bring the Pork Chops?” This title offends all three major religions, and even vegetarians!
69. Thou shalt keep thy religion to thyself.
70. And now, in the interest of equal time, here is a message from the National Institute of Pancakes: It reads, and I quote, “Fuck waffles.”
71. Atheism is a non-prophet organization.
72. Whoever coined the term “Buyer Beware” was probably bleeding from the asshole.
73. Cloud nine gets all the publicity, but cloud eight actually is cheaper, less crowded, and has a better view.
74. Have you ever noticed that the lawyer always smiles more than the client?
75. I’m always relieved when someone is delivering a eulogy and I realize I’m listening to it.
76. Just think, right now as you read this, some guy somewhere is gettin’ ready to hang himself.
77. The reason they call it the American Dream is because you have to be asleep to believe it.
78. If all our national holidays were observed on Wednesdays, we could wind up with nine-day weekends.
79. “Meow” means “woof” in cat.
80. Most people with low self-esteem have earned it.
81. Most people work just hard enough not to get fired and get paid just enough money not to quit.
82. “No comment” is a comment.
83. If a man smiles all the time, he’s probably selling something that doesn’t work.
84. You can’t argue with a good blowjob.
85. Most of the time people feel okay. Probably it’s because at the moment they’re not actually dying.
86. So far, this is the oldest I’ve been.
87. Instead of warning pregnant women not to drink, I think female alcoholics ought to be told not to fuck.
88. Do you think Sammy Davis ate Junior Mints?
89. When you think about it, attention-deficit order makes a lot of sense. In this country there isn’t a lot worth paying attention to.
90. The Golden Gate Bridge should have a long bungee cord for people who aren’t quite ready to commit suicide but want to get in a little practice.
91. I think I am, therefore, I am. I think.
92. If the cops didn’t see it, I didn’t do it!
93. Hooray for most things!
94. Capitalism tries for a delicate balance: It attempts to work things out so that everyone gets just enough stuff to keep them from getting violent and trying to take other people’s stuff.
95. I don’t have a fear of heights. I do, however, have a fear of falling from heights.
96. What was the best thing before sliced bread?
97. May the forces of evil become confused on the way to your house.
98. Life is a zero sum game.
99. Somehow I enjoy watching people suffer.
100. I have as much authority as the Pope. I just don’t have as many people who believe it.
101. It isn’t fair: the caterpillar does all the work, and the butterfly gets all the glory.

Resource Link: http://jamesaquilone.com/101-greatest-george-carlin-quotes/

What is SAM in Java 8?

SAM: Single Abstract Method

Download failed : Oracle JDK 7 is NOT installed

Don't worry about installation jdk 7. SDKMAN is here to resolve your issue. SDKMAN installation is given in this link

It gives a list of java version. You can install all of them. If you have multiple java version, you can specify one of them. You can also set default java version as required.

===============================
$ sdk list java
$ sdk install java 7u141-zulu
$ sdk use java 7u141-zulu
$ sdk default java 7u141-zulu
===============================

For Details,

$ sdk list java

It gives a list of java version

$ sdk install java 7u141-zulu

It installs java 7

$ sdk use java 7u141-zulu

• If you want to use java 7, you can run this command.
• For specific project, you can use specific java version using SDKMAN

$ sdk default 7u141-zulu

It is used to set java 7 as default.

rizvi@rizvi-pc:~$ sdk list java

============================================
Available Java Versions
============================================
   * 9.0.1-zulu                                                                    
     9.0.1-oracle                                                                  
     9.0.0-zulu                                                                    
     8u152-zulu                                                                    
     8u151-oracle                                                                  
     8u144-zulu                                                                    
     8u131-zulu                                                                    
   * 7u141-zulu                                                                    
   * 6u93-zulu                                                                     

=========================================================
+ - local version
* - installed
> - currently in use
=========================================================

You can also use this for multiple gradle

$ sdk install gradle 4.3
$ sdk install gradle 3.0
$ sdk use gradle 4.3 
$ sdk default gradle 4.3

For other installation like scala, groovy, you can follow this tutorial

Download failed : Oracle JDK 6 is NOT installed

Don't worry about installation jdk 6. SDKMAN is here to resolve your issue. SDKMAN installation is given in this link

It gives a list of java version. You can install all of them. If you have multiple java version, you can specify one of them. You can also set default java version as required.

===============================
$ sdk list java
$ sdk install java 6u93-zulu
$ sdk use java 6u93-zulu
$ sdk default 6u93-zulu
===============================

For Details,

$ sdk list java

It gives a list of java version

$ sdk install java 6u93-zulu

It installs java 6

$ sdk use java 6u93-zulu

• If you want to use java 6, you can run this command.
• For specific project, you can use specific java version using SDKMAN

$ sdk default 6u93-zulu

It is used to set java 6 as default.

rizvi@rizvi-pc:~$ sdk list java

============================================
Available Java Versions
============================================
   * 9.0.1-zulu                                                                    
     9.0.1-oracle                                                                  
     9.0.0-zulu                                                                    
     8u152-zulu                                                                    
     8u151-oracle                                                                  
     8u144-zulu                                                                    
     8u131-zulu                                                                    
     7u141-zulu                                                                    
   * 6u93-zulu                                                                     

=========================================================
+ - local version
* - installed
> - currently in use
=========================================================

You can also use this for multiple gradle

$ sdk install gradle 4.3
$ sdk install gradle 3.0
$ sdk use gradle 4.3 
$ sdk default gradle 4.3

For other installation like scala, groovy, you can follow this tutorial

Install SDKMAN JAVA, Gradle, Groovy, Scala

Step by step installation procedure of SDKMAN

First, open a new terminal and enter:

$ curl -s get.sdkman.io | bash

Then follow the instructions on-screen to complete installation.

Open a new terminal or type the command:

$ source "$HOME/.sdkman/bin/sdkman-init.sh"

Lastly, run the following command to ensure that installation is succeeded or not:

$ sdk version

If the installation is successfully done, then version should be displayed as below:

  sdkman 5.0.0+51

Install Java using sdkman: 

$  sdk install java

Install Gradle:

$  sdk install gradle 4.4.1

Install Scala:

 $  sdk install scala 2.12.1

Install Groovy:

 $ sdk install groovy

5 Commands bible:

 $  sdk install gradle 4.4.1 

 $  sdk install gradle 3.0 

 $  sdk use gradle 4.4.1 

 $  sdk default gradle 4.4.1 

 $  sdk uninstall gradle 4.4.1