mongodb

1. https://docs.mongodb.com/manual/tutorial/getting-started/
2. https://university.mongodb.com/courses/M001/about
3. 
   

angular 4 spring boot mongodb crud example

1. http://javasampleapproach.com/spring-framework/spring-mvc/angular-4-spring-boot-mongodb-crud-example
2. 
   

No validator could be found for constraint javax.validation.constraints.Past validating type java.time.LocalDateTime

1. https://stackoverflow.com/questions/30249829/error-no-validator-could-be-found-for-type-java-time-localdate
2. 
   

thymeleaf vs angularjs

1. https://stackoverflow.com/questions/44301334/choosing-between-thymeleaf-and-angular-for-a-new-spring-mvc-project
2. 
   

dynamically passing multiple values in a form

1. http://outbottle.com/spring-3-mvc-adding-objects-to-a-list-element-on-the-fly-at-form-submit-generic-method/
2. 
   

deployment

1. https://kubernetes.io/
2.  

JPA embedded-element-collection

1. https://www.logicbig.com/tutorials/java-ee-tutorial/jpa/embedded-element-collection.html
2. 
   

spring-boot-websocket-chat-example

1. https://www.callicoder.com/spring-boot-websocket-chat-example/
2. 
   

Spring data jpa collection mapping

1. https://www.callicoder.com/hibernate-spring-boot-jpa-one-to-many-mapping-example/
2. 
   

liquibase

1. http://www.liquibase.org/
2. https://en.wikipedia.org/wiki/Liquibase
3. 
   

JPA detached entity passed to persist error

1. https://notesonjava.wordpress.com/2008/11/03/managing-the-bidirectional-relationship/
2. https://stackoverflow.com/questions/13370221/jpa-hibernate-detached-entity-passed-to-persist
3. https://github.com/SomMeri/org.meri.jpa.tutorial/blob/master/src/main/java/org/meri/jpa/relationships/entities/bestpractice/SafePerson.java
4. http://meri-stuff.blogspot.in/2012/03/jpa-tutorial.html#RelationshipsBidirectionalOneToManyManyToOneConsistency
5. 
   

Hibernate mapping

1. https://www.thoughts-on-java.org/ultimate-guide-association-mappings-jpa-hibernate/
2. 
   

linux

1. https://notes.georgboe.com/
2. 
   

rest payload max limit

1. https://stackoverflow.com/questions/1495541/rest-payload-max-size
2. 
   

spring boot rest api

1. http://websystique.com/spring-boot/spring-boot-rest-api-example/
2. https://www.codesandnotes.be/2014/10/31/restful-authentication-using-spring-security-on-spring-boot-and-jquery-as-a-web-client/
3. https://stackoverflow.com/questions/38974428/jquery-alerts-undefined-on-error-instead-of-java-spring-exception-details
4. https://stackoverflow.com/questions/7952154/spring-resttemplate-how-to-enable-full-debugging-logging-of-requests-responses
5. 
   

Labs

1. http://niti.gov.in/content/atal-tinkering-laboratories#
2. 
   

spring boot angular json example

1. https://medium.com/@nydiarra/secure-a-spring-boot-rest-api-with-json-web-token-reference-to-angular-integration-e57a25806c50
2.  

Spring boot exception handling

1. https://www.toptal.com/java/spring-boot-rest-api-error-handling
2. http://www.springboottutorial.com/spring-boot-exception-handling-for-rest-services
3. https://dzone.com/articles/global-exception-handling-with-controlleradvice
4. https://stackoverflow.com/questions/28902374/spring-boot-rest-service-exception-handling
5. 
   

debugging json

1. https://notes.georgboe.com/post/debug-http-400-errors-in-spring-mvc/
2. https://stackoverflow.com/questions/7952154/spring-resttemplate-how-to-enable-full-debugging-logging-of-requests-responses
3. https://pubs.vmware.com/vfabric51/index.jsp?topic=/com.vmware.vfabric.vas.1.0/vas/api-vfabric-docs.html
4. https://stackoverflow.com/questions/38974428/jquery-alerts-undefined-on-error-instead-of-java-spring-exception-details
5. 
   

freelancer guide

1. https://www.freelancelift.com/the-ultimate-guide-to-not-working-on-elance-odesk-and-fiverr/
2. 
   

contribution required

1. apache
2. JSR
3. shopizer
4. eclipse
5. firefox
1. mdn
6. tomcat
7. spring
8. hibernate
9. android
10. 
    

http

1. https://en.wikipedia.org/wiki/HTTP_302
2. https://en.wikipedia.org/wiki/URL_redirection
3. 
   

Spring Security

1. https://en.wikipedia.org/wiki/HTTP_302
2. 
   

geofencing

1. https://developer.android.com/training/location/geofencing.html
2. 
   

Ajax

1. https://dzone.com/articles/ajax-using-xmlhttprequest-object-and-fetch-api
2.  

debugging in browser

1. https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor
2. https://stackoverflow.com/questions/39228657/disable-chrome-strict-mime-type-checking
3. right click on web page 
1. choose inspect element
2. click on network
3. now reload the page or click on submit and check the data
4. https://stackoverflow.com/questions/819213/how-to-debug-javascript-error
5. 
   
6. 
   

domain modellig techniques

1. https://www.infoq.com/articles/seven-modelling-smells
2. https://www.scaledagileframework.com/domain-modeling/
3. http://www.mindscapehq.com/documentation/lightspeed/Domain-Modelling-Techniques
4. Handle one requirement at a time
5. Think about the reports required
6. 
   

profiling

1. https://docs.oracle.com/javase/8/docs/technotes/guides/visualvm/profiler.html
2. 
   

enabling enum inheritance

1. https://stackoverflow.com/questions/35650045/how-to-enable-enum-inheritance
2.  

date time formatting

1. http://javarevisited.blogspot.in/2017/08/how-to-format-parse-dates-with-LocalDateTime-Java-8.html
2. 
   

next

1.  JPA
1. mapping inner class
2. mapping inner interface
2. save data in database
3. apply dynamic fileds functionality in registration
4. accept the values into collection
5. save the values in database
6. validation
7. check for duplicacy
8. type conversion
9. all the form should be populated with values from database. not the present case where values are hardcoded.
10. applying sms gateway 
11. mobile verification through otp
12. apply reactjs
13. apply redux with reactjs
14. 
    

dynamic field creation

1. https://bootsnipp.com/snippets/featured/dynamic-form-fields-add-amp-remove-bs3
2. https://www.codexworld.com/add-remove-input-fields-dynamically-using-jquery/
3. 
   

doubt is out

1. accepting multiple values e.g mobile numbers in to a collection
2. 
   

how-to-get-the-value-of-selected-option-in-a-select-box-using-jquery

1. https://www.tutorialrepublic.com/faq/how-to-get-the-value-of-selected-option-in-a-select-box-using-jquery.php
2. 
   

react js

1. https://reactjs.org/
2. https://dzone.com/articles/bootiful-development-with-spring-boot-and-react 
3. 
   

regular expression requirement for the validation

1. landline number
2. country code
3. youtube video url
1. https://stackoverflow.com/questions/24048308/how-to-get-the-video-id-from-a-youtube-url-with-regex-in-java 
4. adhar id
5. pin code
6. city
7. state
8. country
9. image URL
10. dateofbirth
1. bride(min 18 years max 60 years)
2. groom(min 21 years max 65 years)
11. quaification
12. occupation
13. address
14. 
    

hibernate validator

1. http://hibernate.org/validator/documentation/getting-started/
2. 
   

spring doubts

1. @modelattribute
2. command
3. custom validation
4. 
   

spring boot hibernate validator dependency

spring boot starter web dependency already includes hibernate validator dependency.

Spring MVC validation

1. spring boot starter web dependency already includes hibernate validator dependency.
2.  https://www.journaldev.com/2668/spring-validation-example-mvc-validator
3. http://technicalstack.com/form-validation-part-4-using-annotation-pattern-past-max-etc/
4. https://stackoverflow.com/questions/3813195/regular-expression-for-indian-mobile-numbers
5. mobile no validation
6. birthdate validation for correct range which dependes on gender
7. email validation
8. https://docs.oracle.com/javase/tutorial/essential/regex/intro.html
9. 
   

java 9 features

1. https://docs.oracle.com/javase/9/whatsnew/toc.htm#JSNEW-GUID-5B808B2F-E891-43CD-BF6E-78787E547071

java version release history

1. https://en.wikipedia.org/wiki/Java_version_history

blogging guideline

1. https://docs.google.com/document/d/1T3Mtemue8I8KfHobcBPCwEDUgI_V180e0xjqZVZlDVE/edit
2. https://docs.google.com/document/d/1L-TjM1cP8biT6mIWvH5fYaFHtWyZytzQoqrJ92WqK1A/edit 
3. https://docs.google.com/document/d/15EpG0P5VLBpUH-bGypfS-uBk83rSEj8jeoR9lXJMdS8/edit
4. 
   

showing the newly created page on blogger

1. pages
2. new page
3. publish the page
4. Layout
5. cross column
6. edit 
7. select the newly created page
8. choose save

git error

1. https://stackoverflow.com/questions/38611124/git-commit-not-possible-there-are-no-staged-files
2. 
   

solving programming problem speedily

1. remember God
2. pranayam
3. write down the summary of the problem
4. split the problem into milestones
5. achieve one milestone at a time
6. note down the sample input and output
7. use white plain paper for dry run
8. use pencil and rubber for dry run
9. use meaningful variable names
10. write down what should happen on each milestone or event
11. dont exceed time limit
12. always check or test the code for compile time error and run time error and prescribed time limit for compilation
13. never give up till last moment
14. results dont matter but efforts do
15. note down the lessons you learnt and your shortcomings
16. work on your weakness
17. https://www.quora.com/What-is-the-mathematical-background-necessary-for-competitive-programming
18. https://www.quora.com/What-are-some-must-know-topics-in-discrete-math-and-probability-for-competitive-programming
19.  

Password policy enforcement for Java

1. http://www.passay.org/
2. 
   

Annotation

1. https://docs.oracle.com/javase/tutorial/java/annotations/declaring.html
2.  

enterprise service bus mule

1. https://www.mulesoft.com/resources/esb/what-mule-esb
2. https://stackoverflow.com/questions/3792519/apache-camel-and-other-esb-products
3. go for apache project instead of closed community mulesoft's mule
4. 
   

json to java

1. https://dzone.com/articles/payload-transformation-json-to-object
2. 
   

payload

1. https://softwareengineering.stackexchange.com/questions/158603/what-does-the-term-payload-mean-in-programming
2.  

Linux

1. https://en.wikipedia.org/wiki/BusyBox
2. 
   

training

1. https://www.springpeople.com/
2. 
   

Java Companies

1. oracle
2. google
3. amazon
4. apache
5. red hat
6. ibm
7. sap
8. thoughtworks
9.  

reactive programming

1. https://dzone.com/articles/5-things-to-know-about-reactive-programming
2. 
   

guava

1. https://github.com/google/guava/wiki
2. 
   

validation

1. https://docs.jboss.org/hibernate/validator/5.0/reference/en-US/html/validator-customconstraints.html#validator-customconstraints
2. 
   

Project related questions

1. user defined annotation
1. payload
2. what is the use of dto?
3. validation
4. type conversion
5. 
   

spring cloud

1. http://projects.spring.io/spring-cloud/
2. 
   

debugging web app in web browser

1. use chrome
2. remove required attribute  for fast debugging
3. https://stackoverflow.com/questions/22148080/an-invalid-form-control-with-name-is-not-focusable
4. 
   

Machine Learning

1. https://en.wikipedia.org/wiki/TensorFlow
2. 
   

react js vs angular js

1. https://kruschecompany.com/blog/post/angular-vc-react
2. https://hackernoon.com/reactjs-vs-angular-comparison-which-is-better-805c0b8091b1
3. https://medium.com/unicorn-supplies/angular-vs-react-vs-vue-a-2017-comparison-c5c52d620176
4. 
   

single page application vs multipge application

1. http://www.eikospartners.com/blog/multi-page-web-applications-vs.-single-page-web-applications
2. 
   

explore

1. python
2. tensorflow
3. ros(robotic OS)
4. kotlin
5. reactive system
6. reactive programming
7. kafka
8. 
   

yoga

1. http://www.yogapoint.com/info/ashtanga.htm
2. 
   

DOM

1. each web page has separate dom
2. dom has dynamic property attached to elements
3. https://css-tricks.com/dom/ 
4. 
   

current problem

1. html
2. css
3. javascript
4. json
5. bootstrap
6. jquery
1. parse.JSONresponse.error
2.  $post
3. $each
4. event.preventdefault
5. window.location.href = serverContext + "login?message=" + data.responseJSON.message;
6. $.each( errors, function( index,item ){
                   $("#globalError").show().append(item.defaultMessage+"<br/>");
               });
7. /*<![CDATA[*/
8. /*]]>*/ 
9. th:inline="javascript"
10.  
11. $(":password").keyup(function(){
            if($("#password").val() != $("#matchPassword").val()){
                $("#globalError").show().html(/*[[#{PasswordMatches.user}]]*/);
            }else{
                $("#globalError").html("").hide();
            }
        });
12. .fail() method
1. is it chaining ie fail getting called after post?
13.  https://api.jquery.com/deferred.fail/
7. flow of execution in jquery
8. javascript debugging
9. jquery debugging
10.  setting breakpoints in jquery
11. 
    
13.  

jquery

1.  serialize function
1. https://api.jquery.com/serialize/
2. what if there are multiple ready function?
1. https://stackoverflow.com/questions/5263385/jquery-multiple-document-ready
3. debugging
1. all function must return
2. unique id of elements
3. event execution order
4. https://stackoverflow.com/questions/10638059/javascript-debugging-line-by-line-using-google-chrome
5. 
   

docker

1. https://www.docker.com/what-docker
2. 
   

microservice

1. Microservices is an approach to application development in which a large application is built as a suite of modular services. Each module supports a specific business goal and uses a simple, well-defined interface to communicate with other sets of services.
2.  Microservices must be independently deployable, whereas SOA services are often implemented in deployment monoliths. ... So, SOA is an architectural pattern in which application components provide services to other components. However, in SOA those components can belong to the same application.
3.  https://en.wikipedia.org/wiki/Microservices
4.  

codejam

1. https://icpc.baylor.edu/ 
2. https://www.geeksforgeeks.org/prepare-google-kickstart/
3. https://www.quora.com/What-is-a-good-way-to-prepare-for-Google-Code-Jam 
4. https://code.google.com/codejam/resources/problem-preparation
5. https://groups.google.com/forum/#!topic/google-code/0mzXncavvtM 
6. https://www.youtube.com/watch?v=klXNkEdR1cY
7. Good Math is the first thing
8. Algorithm
1. Time Complexity
9. Data Structure
10. book -> competitive programming
11. Practice Practice and Practice
12. learn all the shortcuts of IDE
13. learn typing
14. Reasoning
15. Puzzles
16. https://fossbytes.com/google-code-jam-2015-heres-everything-you-should-know-to-participate/
17. https://blog.codingblocks.com/2017/howto-prepare-google-apac-acmicpc
18. taking coding course at 
1. Coursera
2. Competitive Coding Bootcamp. 
19. regular expression
20. file handling
21. https://news.ycombinator.com/item?id=801835
22.  https://stackoverflow.com/questions/2228402/being-able-to-solve-google-code-jam-problem-sets
23.  http://jugglingcode.blogspot.in/2012/06/tipsstrategy-for-google-code-jam.html
24. techgig
25. codechef
26. topcoder
27. codeforce
28.  https://code.google.com/codejam/resources/faq
29.  https://code.google.com/codejam/terms
30.  https://stackoverflow.com/questions/2228402/being-able-to-solve-google-code-jam-problem-sets
31.  ACM-ICPC

Angular JS

1. https://thinkmobiles.com/blog/best-angularjs-apps-examples/
2. 
   

JPA work

1. caching esp in case of manytomany
2. 
   

unresolved

1. JPA
1. onetoone (targetentity)
1.  If we did, we would need to specify the type of entity that will be stored in the
   Collection that is needed by the persistence provider. The code is shown in Listing 4-21 and looks
   almost identical, except for the targetEntity element that indicates the entity type.
2. set vs list to guarantee the uniqueness of elements in collection
2. validation
3. cascade
4. domain modelling correction
5. 
   

spring data jpa one to many example

1. https://www.callicoder.com/hibernate-spring-boot-jpa-one-to-many-mapping-example
2.  error-
1.  object references an unsaved transient instance 
1. https://stackoverflow.com/questions/2302802/object-references-an-unsaved-transient-instance-save-the-transient-instance-be
3. https://hellokoding.com/jpa-one-to-many-relationship-mapping-example-with-spring-boot-maven-and-mysql/
4. https://dzone.com/articles/spring-data-jpa-and-database
5.  

spring data rest

1. http://www.baeldung.com/spring-data-rest-relationships
2.  https://reflectoring.io/relations-with-spring-data-rest
3.  

java finding the run time options related to jre

1. java -XshowSettings
2. java -X
3. 
   

Interesting Projects

1. Finding the originator of a fb post that has gone viral using fb api
2. deciphering the geo coordinates from ip address
3. programmatically accessing whatsapp messages and automatically deleting the irrelevant content based on specified criteria and storing the relevant content onto the free online databases and sending their links as email
1.  https://fileinfo.com/extension/crypt12
4. 
   

Spring boot logging framework

1. https://dzone.com/articles/configuring-logback-with-spring-boot
2.  

logstash

1. Logstash is an open source tool for collecting, parsing, and storing logs for future use. Kibana 3 is a web interface that can be used to search and view the logs that Logstash has indexed. Both of these tools are based on Elasticsearch. Elasticsearch, Logstash, and Kibana, when used together is known as an ELK stack.
2. https://www.elastic.co/products/logstash 
3. 
   

setting jvm options

1. https://www.elastic.co/guide/en/elasticsearch/reference/current/jvm-options.html
2.  

Hanuman

1. 
   

The Chronicles Of Hanuman

By Shubha Vilas

 

Spring boot actuator

1. http://www.baeldung.com/spring-boot-actuators
2. 
   

thread

1. kernel thread
2. user level thread
3. 
   

Interesting book to build linux appliance

1. Linux Appliance Design: A Hands-on Guide to Building Linux Appliances

   By Bob Smith, John Hardin, Graham Phillips
2.  

JVM

1. https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-2.html
2.  https://docs.oracle.com/javase/8/docs/technotes/guides/vm/enhancements-8.html
3.  

preventing cutting off stack traces

1.  https://stackoverflow.com/questions/11865307/how-to-expand-size-of-java-stack-trace-to-see-bottom-of-stack-triggering-a-sta
2. http://apache-logging.6191.n7.nabble.com/Q-how-to-prevent-log4j-from-cutting-off-stack-traces-td9011.html
3. https://www.wowza.com/community/questions/7108/truncated-exception-stack-traces.html
4.  https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-2.html
5. http://stas-blogspot.blogspot.in/2011/07/most-complete-list-of-xx-options-for.html
6. http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html
7. https://dzone.com/articles/configuring-logback-with-spring-boot 
8. https://docs.spring.io/spring-boot/docs/current/reference/html/howto-logging.html 
9. Strategy
1. Virtual Machine
2. Embedded Tomcat
3. Logging Framework (logback)
4. JPA
5. Spring
6. 
   

Java Performance Tuning

1. https://dzone.com/articles/java-performance-tuning
2. https://blog.oio.de/2014/03/07/java-profilers-a-short-comparison-between-jprofiler-yourkit-and-javas-visualvm/ 
3.  memory footprint of the application
4. dump
5. jni call
6. 
   

official oracle java articles

1. http://www.oracle.com/technetwork/java/index.html
2. 
   

JVM Command line options

1. https://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/jrdocs/refman/optionXX.html
2. http://jawspeak.com/2010/05/26/hotspot-caused-exceptions-to-lose-their-stack-traces-in-production-and-the-fix/
3. 
   

No ORM

1. https://www.objectdb.com
2. 
   

database purge vs delete

1. https://stackoverflow.com/questions/12085699/differences-between-purge-and-delete-files
2. 
   

Optional in Java SE 8

1. http://www.oracle.com/technetwork/articles/java/java8-optional-2175753.html
2.  

JPA Annotations

1. https://www.objectdb.com/api/java/jpa/PrePersist
2. A callback method is a method that we do not call
3. it is called by the framework
4.  Prepersist is a marker annotation
5. 
   

Project skill required

1. Spring data JPA
2. JPA
3. Spring boot
4. Hibernate
5. MySQL
6. Spring MVC
7. Thymeleaf
8. Spring Security
9. Jquery
10. Bootstrap
11. CSS
12. HTML
13. JSON
14. AWS
15. Android
16. CI/CD

reading aloud a pdf in windows 10

1. Just double click on a pdf file and then choose read aloud option above 
2. it will start reading aloud the book
3. 
   

Image editing

1. adding watermark to an image
2. adding logo to an image
3. removing watermark from an image
4. removing logo from an image
5. cropping
6. changing the background
7. changing the color
8. 
   

screencasting

1. https://www.techsmith.com/blog/what-is-screencasting/
2. 
   

obtaining radio button value

We can pass any value through radio button just we need to mention the value in the value attribute

table creation in oracle sql developer tool

1. https://youtu.be/1URnfrR2fEc

Tool

1. SourceTree 
1. GUI git tool
2. Oracle SQL Developer( for interacting with Oracle)
3. 
   

Video Editing through da vinci resolve 14

1. https://www.blackmagicdesign.com/products/davinciresolve/training
2.  terms
1. bit rate
2. encoding
3. transcoding
4. color correction
5. https://www.youtube.com/watch?v=UMAApAZExSc 
6. codec
7. coder
8. decoder
9. waveform
10. pal
11. ntsc
12. video formats
13. converting one format to the other
14. download the avc video converter
1. http://www.any-video-converter.com/download-avc-free.php 
15.  When I converted .avi file of size 977 mb into .mp4 format its size got reduced to 119 mb
16. when i converted .avi to .mp4 format, it was recognized by da vinci resolve 14
17. milestones
1. extracting audio from a video
2. video cutting
3. removing logo from image
4. removing lower/front/right/left part from image
5. adding logo to a video
6. mixing two videos
7. adding text to a video
8. adding image to a video
9. adding a thumbnail to a video
10. adding subtitles to a video
11. color correction
18. video editing softwares
1. after effects or blackmagic design's fusion
2. premiere pro or da vinci resolve 14
3. blender
4. final cut
19. da vinci 14
1. timeline
2. ripple cut
3. ripple delete
4. clip
20. https://blender.stackexchange.com/questions/8864/how-to-reduce-the-output-video-size
21. https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=36717
22.  http://www.pavtube.com/upload-davinci-resolve-video.html

Programming drones

1. https://www.ibm.com/developerworks/community/blogs/cda1f314-79a2-4211-ae2e-d1fd2741222a/entry/Basics_Of_Programming_A_Drone?lang=en
2.  http://mydronelab.com/blog/how-to-build-a-drone.html
3. https://stackoverflow.com/jobs/companies/windhover-labs 

nice post

1. https://blog.codinghorror.com/

import or push to github repository in eclipse IDE

first we need to create repository with github. It can be public or private.
Steps for IDE (eclipse or STS)->
File
->import
->projects from github
-> clone URI
now copy the clone URI and paste in to box of the IDE
enter the credentials ie user name and password
do not enter any port number
commiting to the github
now make changes in the project
right click and choose team
add to index
commit
enter message and click on commit
=====================================
We can import public github repository to our own repository. and make it private.
and then import the project and choose clone uri into Spring tool Suite.
if there is any error->
right click on the project and maven -> update project-> force update
make changes in the project
add to index
commit
enter message and click on commit and push

AWS Precautions

AWS beanstalk with rds
while we delete the environments aws creates the snapshots that take up 5 gb each. so I had to pay around 7$ even though I was in free tier just because of this.
So please be careful .
I changed the backup retention period to 0 then all the snapshots got deleted.
and applied the changes immediately

1. 
   https://stackify.com/java-performance-tuning/
2.  

Inventory Management

1. Plan for every part(pfep)
2. 
   

FB Post

1. https://dzone.com/articles/5-things-java-programmer-should-learn-in-2018
2. 
   

Destination Skill

1. NoSQL
2. Microservices
3. AWS
1. EC2
2. Loadbalancing
3.  
4. Github 
1. Team Working
5. CI and Jenkins
1. Travis
2. CircleCI
3. Code Deploy
6. CD
7. Testing
8. UML
9. Algorithm
10. Data Structure
11. Profiling
12. JVM Performance tuning
13.  Effective Java
14. Certification test
15. Maven
16. Gradle
17. Android
18. NDK
19. Spring 5
20. Spring Security 5
21. Spring boot
22. Spring data JPA
23. JSF
24. WebServices
25. SOAP
26. XML
27. DBA certification
28. MySQL
29. Queries
30. CodeJam
31. CodeChef
32. Techgig
33. guru
34. odesk
35. upwork
36. committing to Apache Project
37. committing to Shopizer
38. committing to eclipse
39.  Java Expert group
40. Groovy
41. Grails
42. Hibernate
43. HTML
44. CSS
45. JavaScript
46. JQuery
47. Bootstrap
48. JSON
49.  geeksforgeeks
50.