Pankaj Shet

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since Sep 08, 2006
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Scala Spring Java
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Recent posts by Pankaj Shet

Hi Ranchers,

I wish to build an application which will run in an On-Prem  Vm and will connect to various clouds pulling their Infrastructural Details using the login details
I wish to fetch the infrastructure details without deploying this current app.

What framework do you suggest?

How to approach this particular use case?

I tried to do it using Spring cloud. But region detection needs me to deploy that App on AWS EC2 which is not what I want.  

Request your help.


9 months ago
Hi Monica,

Scala do have Functional Interfaces like Java 8 in form of Function0, Function1 until Function22.. which take 0, 1..22 parameters respectively.
The return type of the Scala Lambda can be one of these 22 Functions.
They are not Functional Interfaces but they are traits something similar to interfaces.
These 22 traits also have a single abstract method(apply with equivalent number of parameters i.e. 0,1,...22)  similar to functional interfaces in Java 8.
They can be found in the package named scala.

Hope this gives a clear picture of how scala lambdas work.


1 year ago
Hi Ranchers,

I have 9+ Years of Software Developement Experience and am a very passionate about working in the latest trends with Contineous Learning.

I am looking out for the first job as freelancer.

Experience and Expertise
Backend      -      Java, JSP, Servlets, Spring(Core, MVC, JMS(ActiveMQ), JDBC, MyBatis), Spring Boot
Frontend     -      JavaScript EXTJS/ VueJS.  
Databases   -      MySQL and Oracle.

Have knowledge on reactive programming frameworks like Spring WebFlux and Axon Framework(Reactive Microservices) as well.  

Have Good knowledge of Scala language(OOP as well as Functional Programming)
Learning and looking to get hands on experience on Spark, Kafka, Cassandra,    
Am a Lightbend Certified Reactive Architect - A certification is all about DDD, Reactive Microservices and Software Architecture.
Passionate about building reactive systems using (Akka/ Play/Lagom.)
Passionate about Clojure as well.

Please let me know if there is any freelance work for me.

My Contact Info:

Email Id: pankaj"dot"shet123"at"gmail"dot"com
Mobile no: +91-9819318776.


1 year ago
Hi Ranchers,

Hope every thing is going well.

What do you guys think about the lightbend certified reactive architect certification?

Why is it not getting so popular yet like AWS and Others?

Have a look at this : Lightbend Certified Reactive Architect

Thanks Mathew for this Answer. But do you mean Migration will not help much?

I feel that javascript frameworks will be much lighter compared to JSPs.
JSP is a server side rendering. JSPs will be converted into servlets, and then they will be rendered.
Hence, render perfomance is slow in case of JSPs.
Javascript frameworks will be Client Side rendering, hence performance will be much faster.

Apart from the above, How are JSP's advantageous over Javascript frameworks?


Hello Guys,

I was able to clear the 'Lightbend Certified reactive architect' exam 2 weeks back.

This has helped me a lot for understanding what really is reactive systems.

Hi Ranchers,

I have a small question regarding the above topic.

How is the migration of spring mvc with jsp (JSTL) to spring boot Javascript frameworks(Angular /Reactjs/Vuejs) helpful?

What are the advantages of doing so?

Thanks a Lot for your reply Junilu,

But if there are three instances getting created, if there are three constants, than that's not the singleton.  There must be the way to restrict enums to create a single instance irrespective of number of ENUM Constants.

Otherwise I can definately create the singleton object using class by creating just a single object of that class in the same way I create the single ENUM constant, without writing any additional code of restricting that class?

What's your say?

Hi Ranchers,

It is said that Enum singletons are the best way way to create singletons.

How ever I have one doubt.

Writing Enum Singleton is very simple.


and we access it in the following way,



If we write two or more Enum Constants like:

doStuff() is accessible by all 3 INSTANCEs?

there are 2 possibilities:

1) 3 different Instances are created
2) Still at any point of time, irrespective of number of constants, only single instance is created?

If the 2nd possibility is true, then its a true singleton.

but if 1st possibility is true, Its like we are creating just one instance of the ENUM and saying its a singleton.

There should be a way to restrict the no of constants in the ENUM, to one and only one and not more than one to make the ENUM a Singleton.

I request your opinion on the same.


Also if there is anything better other than AWS kindly suggest. IBM BLUEMIX, AWS, ORACLE CLOUD, OPENSHIFT, AZURE, GCP, Salesforce etc.. Whichever cloud technology certification is the hottest in the market kindly suggest.

2 years ago
Hi Ranchers,

If anybody is AWS certified Devops professional, I request you please help me with the detailed preparation approach.

Where should I start? Which path to follow? Etcc..
Is this certification really valuable in the market?

2 years ago

Thanks for your reply Stephan.

It is using Spring platform, but we are not using Spring Security.

What we are doing is explained in brief:

Everytime the user logs in, the User credentials are verified from db and JWT tokens are sent back to user.
Every subsequent request which is not the login request is intercepted by the spring HandlerInterceptor which does the job of verifying the tokenstring, parsing the claims.
If claims are formed succcessfully, the request is processed further else it is not.
We are using https request..!

So now I want to understand why would I have to integrate OAUTH2, OpenID and Spring Security,  what are the advantages of using each.

Apart from above if anything is found more secure please suggest.

I want to make REST API Ultra secure.

Please help me out for the same.

2 years ago