method comment in eclipse

1. Following are the steps to add method comments-
2. preferences
1. Java
1. Code Style
1. Code Templates
1. method
1. Insert variable
3.  Now to test the above
1. just type /** and press enter before a method
4. 
   

STS

1. https://stackoverflow.com/questions/45457538/ctrl-shift-o-for-organize-import-not-working-in-sts

json

1. http://tutorials.jenkov.com/java-json/jackson-objectmapper.html
2. http://jsonviewer.stack.hu/ 
3. https://www.baeldung.com/jackson-object-mapper-tutorial
4.  

ubuntu permission

sudo chmod -R 777 /* to give permission to the folder and all its contents recursively

installation of visual studio code for angular

1. download .deb 64 bit package for ubuntu  from https://code.visualstudio.com/download
2. open terminal and goto the location where the file exists
3. type the following
1. sudo dpkg -i code_1.27.2-1536736588_amd64.deb
4. goto search bar
5. type visual studio code
6. lock it to launcher

mysql docker container

1. https://severalnines.com/blog/mysql-docker-containers-understanding-basics
2. 
   

Enum

1. https://stackoverflow.com/questions/18883646/java-enum-methods/18883717
2. 
   

tag implementation

1. https://www.baeldung.com/jpa-tagging
2. https://www.nayuki.io/page/designing-better-file-organization-around-tags-not-hierarchies
3. 
   

domain driven design

1. books “Domain-driven Design” by Eric Evans and “Implementing Domain-driven Design” by Vaughn Vernon
2.  
3. value object is the object of a class whose constructor is private and which is constructed with the help of factory method inside it. they are not treated as entity. and two value objects having same state are considered to be equal.
4. https://deviq.com/value-object
5. they are small
6. they are immutable
7. https://martinfowler.com/bliki/ValueObject.html
8. https://enterprisecraftsmanship.com/2016/01/11/entity-vs-value-object-the-ultimate-list-of-differences/
9.  
10. value objects can be considered as @component
11. address is a good example of value object
12. value object should not be in a separate table.
13. value object should not have own identity
14. aggregates
1. https://medium.com/withbetterco/using-aggregates-and-factories-in-domain-driven-design-34e0dff220c3
2. https://www.infoq.com/news/2015/01/aggregates-value-objects-ddd
3.  

ubuntu

1. https://askubuntu.com/questions/278448/how-to-know-what-program-is-listening-on-a-given-port
2. 
   

docker

1. sudo docker pull netflixoss/eureka generates the following error
2.  Using default tag: latest
   Error response from daemon: manifest for netflixoss/eureka:latest not found
   solution is ->
3. sudo docker pull netflixoss/eureka:1.3.1
1. where 1.3.1 is the tag
4. following is the way to run i.e create a container:
5. sudo docker run netflixoss/eureka:1.3.1
6. the problem is unable to connect to the port 
7. https://stackoverflow.com/questions/47612400/docker-run-unable-to-access-jar-file 
8. https://bartwullems.blogspot.com/2017/03/docker-error-err
9. http://blog.thoward37.me/articles/where-are-docker-images-stored/
10. https://stackoverflow.com/questions/25101312/does-all-running-docker-containers-have-a-separate-process-id
11.  sudo docker container ls -> will all the running containers
12. docker --help//help commands
13. how to locate Dockerfile of pulled docker image ?
14. docker-compose.yml
15.  If you need to customize an image image, you should create a Dockerfile, with the first line:
    

    FROM ubuntu

16. 
    
    Yes, every docker container will have a different PID on your host machine.
    You can get a docker containers PID by doing:
    

    docker inspect --format '{{ .State.Pid }}' CONTAINER_ID
    

    If you kill the process on your host, your docker container will die.
    
    example
    sudo docker inspect --format '{{ .State.Pid }}' 18f966e5228f
    
    
    

maven on ubuntu for spring boot application

1. maven creates the executable jar inside target folder through the following command:
1. mvn clean package
2. 
   

serenity screenplay bdd

1. http://serenity-bdd.info/docs/articles/screenplay-tutorial.html
2. http://www.baeldung.com/serenity-screenplay
3. 
   

fixer api

1. https://fixer.io/
2. 
   

ussd

1. USSD (Unstructured Supplementary Service Data) is a Global System for Mobile(GSM) communication technology that is used to send text between a mobile phone and an application program in the network. Applications may include prepaid roaming or mobile chatting.
2.  

raster vs vector

1. https://www.psprint.com/resources/difference-between-raster-vector/
2. 
   

lambda expression

1. https://howtodoinjava.com/java-8-tutorial/
2. https://www.journaldev.com/2389/java-8-features-with-examples
3. 
   

gradle

1. gradle in 5 mins
2. 
   

rest api

1. For simplicity, our example application only sends JSON back and forth, but the application should be architectured in such a way that you can easily change the format of the data, to tailor for different clients or user preferences.
2.  

android rest

1. https://code.tutsplus.com/tutorials/android-from-scratch-using-rest-apis--cms-27117
2. https://code.tutsplus.com/tutorials/a-beginners-guide-to-http-and-rest--net-16340
3. https://dzone.com/articles/creating-a-simple-android-rest-client-using-http-r
4. 
   

spring boot

1. externalized configuration
2. 
   

java features latest

1. optional
2. 
   

spring exception handling

1. https://www.journaldev.com/2651/spring-mvc-exception-handling-controlleradvice-exceptionhandler-handlerexceptionresolver
2. https://dzone.com/articles/global-exception-handling-with-controlleradvice
3. 
   

mockito

1. https://medium.com/@gustavo.ponce.ch/spring-boot-restful-junit-mockito-hamcrest-eclemma-5add7f725d4e 
2. can we use same mock in two different test methods? what would be its implications ie. pros and cons?
3. what layer is best suitable for being tested through mockito? controller or service? or both?
4. https://dzone.com/articles/spring-boot-unit-testing-and-mocking-with-mockito
5. @Mock vs @InjectMocks?
6. 
   

error-selection-does-not-contain-a-main-type

1. https://stackoverflow.com/questions/31250359/git-repository-how-to-recover-deleted-files
2. check the folder structure
3. do you have src/main/java structure and inside it do you have Main class?
4. 
   

github cloning a repository from a specific commit

1. clone a repository as usual ie 
1. git clone repository url
2. user name and password if it is private
2. git reset --hard a0f64dcd987669aa15d59a39a51f583b3cqd05k2
3. in the above command the value after hard flag is the SHA of commit at that particular instant of repository
4. import as maven project in sts
5. 
   

github recovering a deleted file from previous commit

1. click on total number of commits
2. here you can view all the commits
3. now go to a commit where a file existed and click on < > symbol and if you find the file just download it 
4. 
   

redirecting request on port 80 to 8080 on ubuntu

1. sudo iptables -A PREROUTING -t nat -p tcp --dport 80 -j REDIRECT --to-ports 8080

   the above command will redirect the requests coming on port 80 to port 8080

spring boot file upload to amazon s3 on ubuntu

1. https://medium.com/oril/uploading-files-to-aws-s3-bucket-using-spring-boot-483fcb6f8646 
2. first sign up or login to your amazon account and create bucket in s3. then create a user and give permission ie programmatic access 
3. @Configuration
   public class S3Config {
   
       @Value("${userid.aws.access_key_id}")
       private String awsId;
   
       @Value("${userid.aws.secret_access_key}")
       private String awsKey;
      
       @Value("${userid.s3.region}")
       private String region;
   
       @Bean
       public AmazonS3 xyz(){
           System.out.println("Inside s3Client of S3Config ");
           BasicAWSCredentials awsCreds = new BasicAWSCredentials(awsId, awsKey);
           AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                                   .withRegion(Regions.fromName(region))
                                   .withCredentials(new AWSStaticCredentialsProvider(awsCreds))
                                   .build();
           return s3Client;
         }
   
   
   }
4. @Controller
   public class AController {
      
       @Autowired
       private S3Service s3service;
     
             @PostMapping("/uploadFile")
            
           
             public String uploadFile(@RequestPart(value = "xyz") MultipartFile multipartFile,Model map,HttpServletRequest request) {
                
                 System.out.println("Inside upload file of bucket controller ");
   
                 try
                 {
                     String filePath = request.getServletContext().getRealPath("/");
                                    
                     System.out.println("filePath is "+filePath);
                     File f1=new File(filePath+"/"+multipartFile.getOriginalFilename());
                     multipartFile.transferTo(f1);
                     System.out.println("f1 is "+f1);                 
                    
                     String fileName=f1.getName();
   
                  String fileUrl=s3service.uploadFile(fileName, f1);
                
                 /**
                  * we should be sure that the file has indeed been uploaded 
                  */
                   map.addAttribute("fileUrl", fileUrl);                         
                  f1.delete();
                 
                /* for rest request
                  return fileUrl;
                  */              
                 
                  return "uploadSuccess";
                 
                 }
                 catch(IOException e)
                 {
                     e.printStackTrace();
                     return e.toString();
                 }
                
           }
5. @Service
   public class S3ServicesImpl implements S3Service {
       private Logger logger = LoggerFactory.getLogger(S3ServicesImpl.class);
       /* (non-Javadoc)
        * @see com.epilen.androidPatient.service.aws.s3.S3Service#downloadFile(java.lang.String)
        */
      
   
      
       @Autowired
       private AmazonS3 s3client;
   
       @Value("${userid.s3.bucket}")
       private String bucketName;
      
       @Value("${s3.endpointUrl}")
       private String endpointUrl;
      
      
       /**
        * convert multipart to file
        * @param file
        * @return
        * @throws IOException
        */
      
      
       @Override
       public void downloadFile(String keyName) {
          
           try {
              
              System.out.println("Downloading an object");
              S3Object s3object = s3client.getObject(new GetObjectRequest(bucketName, keyName));
              System.out.println("Content-Type: "  + s3object.getObjectMetadata().getContentType());
              Utility.displayText(s3object.getObjectContent());
              logger.info("===================== Import File - Done! =====================");
              
           } catch (AmazonServiceException ase) {
               logger.info("Caught an AmazonServiceException from GET requests, rejected reasons:");
               logger.info("Error Message:    " + ase.getMessage());
               logger.info("HTTP Status Code: " + ase.getStatusCode());
               logger.info("AWS Error Code:   " + ase.getErrorCode());
               logger.info("Error Type:       " + ase.getErrorType());
               logger.info("Request ID:       " + ase.getRequestId());
           } catch (AmazonClientException ace) {
               logger.info("Caught an AmazonClientException: ");
               logger.info("Error Message: " + ace.getMessage());
           } catch (IOException ioe) {
               logger.info("IOE Error Message: " + ioe.getMessage());
           }
       }
   
       /**
        * this method will return the fileurl
        */
       @Override
       public String uploadFile(String fileName, File file) {
           System.out.println("Inside upload file of S3ServiceImpl");
           try {
                  
               s3client.putObject(new PutObjectRequest(bucketName, fileName, file));
               logger.info("===================== Upload File - Done! =====================");
              
               String fileUrl = endpointUrl + "/" + bucketName + "/" + fileName;
               return fileUrl;
              
           } catch (AmazonServiceException ase) {
               logger.info("Caught an AmazonServiceException from PUT requests, rejected reasons:");
               logger.info("Error Message:    " + ase.getMessage());
               logger.info("HTTP Status Code: " + ase.getStatusCode());
               logger.info("AWS Error Code:   " + ase.getErrorCode());
               logger.info("Error Type:       " + ase.getErrorType());
               logger.info("Request ID:       " + ase.getRequestId());
               return ase.toString();
              
           } catch (AmazonClientException ace) {
               logger.info("Caught an AmazonClientException: ");
               logger.info("Error Message: " + ace.getMessage());
               return ace.toString();
           }
       }
   
      
   }
6. public interface S3Service {
           public String uploadFile(String fileName, File file);
   }
7. 
   pom.xml entry->.   
       <dependencyManagement>
     <dependencies>
       <dependency>
         <groupId>com.amazonaws</groupId>
         <artifactId>aws-java-sdk-bom</artifactId>
         <version>1.11.327</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
     </dependencies>
   </dependencyManagement>
   
     <dependencies>
    
      <dependency>
       <groupId>com.amazonaws</groupId>
       <artifactId>aws-java-sdk-s3</artifactId>
     </dependency>
    
      <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
      <version>4.5.2</version> 
    </dependency>
    
     the above reduces the jar size from 90 mb to 35 mb and downloads only s3 dependencies
8. application.properties entries                                                                          userid.aws.access_key_id=  userid.aws.secret_access_key=                                                                             userid.s3.bucket=
   userid.s3.region=
   s3.endpointUrl=

finding all the places in project where a class is used in eclipse

1. https://stackoverflow.com/questions/1504784/eclipse-java-see-where-class-is-used
2.  

adding created by comment automatically at class creation time in eclipse

1. right click on the project
2. Choose Java Code Style in left
3. Check enable Project specific settings
4. expand comments
5. choose files
6. edits
7. type "created by" or 
8. choose insert variables

spring profile

1. https://www.mkyong.com/spring/spring-profiles-example/
2. 
   

unit test for rest api

1. https://www.concretepage.com/spring-boot/spring-boot-profiles-example
2. 
   

best coding standard

1. clean coders by uncle bob martin
2. tdd by example 
3. polyglot programming
4. 
   

performance

1. https://blog.gceasy.io/2017/12/15/word-powerpoint-excel-or-gc-thread-heap-dumps/
2. 
   

best practices

1. https://sourcemaking.com/
2. 
   

java interview questions

1. jmeter
2. jprofiler
3. garbage collection
4. dealing with outofmemory exception
5. 
   

hiring

1. take enough time in hiring the right people but when once you have hired them, give them full power n flexibility .
2. 
   

angular 4 spring boot integration issues

1. routing
2. cache issue
3. guard issue
4.  whitelabel issue
5. can not read property of controls
6. 
   

mongodb installation on windows

1. windows key
2. cmd
3. ctrl+shift+enter for administrator prompt
4.  msiexec.exe  /q /i mongodb-win32-x86_64-2008plus-ssl-3.6.4-signed.msi INSTALLLOCATION="(drive or install location):\MongoDB\Server\3.6.4\" ADDLOCAL="all"
5.  the above also installs compass
6.  add the bin folder location to the path variable
7.  create \data\db data directory in the drive from which you want to start mongodb
8. goto the drive where you have installed mongodb and run the mongodb server as follows:
9. mongod
1. this server window will be open and wait to listen for the client connection
10.  now run the mongodb client as mongo on the same drive
11. cls clears the screen
12.  ->
13. reference: 
14. https://docs.mongodb.com/manual/mongo/ 
15. https://docs.mongodb.com/manual/introduction/
16. https://docs.mongodb.com/tutorials/install-mongodb-on-windows/
17. https://www.mkyong.com/mongodb/how-to-install-mongodb-on-windows/
18. its set up failed after it took about around 1 hour.
19. useful:
1.  https://docs.mongodb.com/manual/tutorial/install-mongodb-on-windows/
2. https://docs.mongodb.com/manual/reference/configuration-options/ 
3.  

angular 4 integration with spring boot

1. four build files of angular are placed into static folder of Spring boot project

angular 4 hello

1. install node,js from https://nodejs.org/en/
2. follow https://angular.io/guide/quickstart
3. 
   

testing tool

1. https://insomnia.rest/
2. 
   

Maven

1. https://stackoverflow.com/questions/10822667/build-html-page-during-maven-build
2. https://www.sitepoint.com/building-front-end-maven-simple-resources/
3. 
   

cloning github wiki repository to the other

1. solving error "remote repository already exists"
2. following are the ways: 
3. git remote rm origin // to remove the existing repository
    
4. git remote add origin https://github.com/username/abc.wiki.git
   
    
5. git add . //for staging files
    
6. git commit -m  "first doc commit"
   [master 55a63a5] first doc commit
    10 files changed, 1428 insertions(+), 1 deletion(-)
    create mode 100644 A.md
    create mode 100644 R.md
    create mode 100644 D.md
    create mode 100644 G.md
    create mode 100644 N.md
    create mode 100644 P.md
    create mode 100644 Rn.md
    create mode 100644 S.md
    create mode 100644 n.md
   
7. git push origin master
   fatal: HttpRequestException encountered.
      An error occurred while sending the request.
    
8. Username for 'https://github.com': 
9. Password for
   Counting objects: 12, done.
   Delta compression using up to 4 threads.
   Compressing objects: 100% (11/11), done.
   Writing objects: 100% (12/12), 7.35 KiB | 0 bytes/s, done.
   Total 12 (delta 1), reused 0 (delta 0)
   remote: Resolving deltas: 100% (1/1), done 

https://stackoverflow.com/questions/10904339/github-fatal-remote-origin-already-exists

github limiting rights

1. https://help.github.com/articles/about-codeowners/
2. 
   

messaging

1. https://firebase.google.com/docs/auth/android/phone-auth
2. https://www.twilio.com/sms

blogging

1. https://blog.markgrowth.com/how-to-start-a-beautiful-personal-blog-using-medium-ca6d89b7e46#.9dojul756
2. 
   

website wireframe

1. https://www.webascender.com/blog/how-to-build-a-website-wireframe-using-google-docs/
2. 
   

microservices

1. https://dzone.com/articles/java-microservices-code-examples-tutorials-and-more
2. 
   

Project Management

1. https://www.atlassian.com/software/jira?_mid=0feb0441a976079b827b9d9027d73822 
2. https://www.timecamp.com/blog/index.php/2015/09/top-6-benefits-using-time-tracking-jira-2/
3.  https://drive.google.com/open?id=1t0DT1YgfKflw1HaGmhsY0Xyi2B3-bgxb
4.  https://www.zoho.com/projects/
5.  free tools
1. google hangout for live video sessions
2. whatsapp group for the team
6. 
   
7. https://www.backblaze.com/
8. https://www.zoho.com/mail/
9. https://www.invisionapp.com/
10. https://mlab.com/
11. 
    
12. Bitbucket
    JIRA
    Bamboo
    Confluence
    AWS
    =============================================
    technology architecture
    Microservices
    ==============================================
    technology stack
    Spring boot
    Angular js
    Mongdb
    Express js
    Nodejs
    ===============================================
    Android
    ================================================
    UML
    documentation
    ================================================
    Testing
     unit testing
     automation testing
     performance testing
     security testing
    =================================================
     Clean coding
    =================================================
    scrum
    =================================================
    Design Patterns
    =================================================
    task management
    people management
    project management
    revenue management
    change management
    skill management
    document management
    code management
    ==================================================
    google docs
    whatsapp group
    ===================================================
    UML
    {
    use cases
    }
    
    Testing
    {
    unit testing
    }
    CI/CD
    AWS
    Maven
    
    Angular4
    Mongodb
    Spring boot
    ==========
    MSg91
    IBM Watson
    ===========
    
    * Github
    * JIRA
    * CI/CD
    *  travis
    *  jenkins
    * AWS
    
    ==========
    QA
    * testing
    * unit testing
    * automation testing
    * performance testing
    * security testing
    * code review
    *  
    * DevOps
    *
    * ===========
    Domain Expert
    * UML
    * OOAD
    * Design Patterns
    * documentation
    =====================
    * AI
    * python
    * machine learning
    * Tensor flow
    ======================
    * AWS technologies
    =======================
    * Mobile User Experience
    * Web User Experience
    * =======================
    * Security Expert
    * =======================
    * IBM Watson Application
    ==========================
    * SMS gateway application
    * interaction through SMS
    * login through SMS
    * auto response through SMS
    ===============================
    Revenues
    =================================
    Risk Management
    ===================================
    People Management
    ===================================
    Task Management
    ===================================

JPA Latest

1. https://www.thoughts-on-java.org/whats-new-in-jpa-2-2/
2. https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/chapters/domain/identifiers.html
3. 
   

JPA derived identifier

1. https://jeddict.github.io/page.html?l=tutorial/DerivedIdentities
2. 
   

learning

1. https://instruqt.com/
2. 
   

JPA mapping

1. https://stackoverflow.com/questions/12860781/hibernate-jpa-multiple-onetomany-for-same-model
2.  https://coderanch.com/t/216143/databases/Hibernate-multiple-relationships-class
3.  

JPA best practices

1.  https://stackoverflow.com/questions/2585641/hibernate-jpa-db-schema-generation-best-practices
2.  
3. do not let hibernate create the schema
4. https://stackoverflow.com/questions/8815037/how-to-create-database-schema-in-hibernate-first-time-and-further-update-it-in-c 
5. https://www.thoughts-on-java.org/hibernate-tips-create-initialize-database/
6. https://shekhargulati.com/2018/01/09/programmatically-generating-database-schema-with-hibernate-5/ 
7.  http://what-when-how.com/enterprise-javabeans-3/domain-modeling-and-the-jpa-ejb-3/

jpa useful links

1. https://vladmihalcea.com/the-best-way-to-map-a-onetomany-association-with-jpa-and-hibernate/
2. https://www.thoughts-on-java.org/best-practices-many-one-one-many-associations-mappings/
3. http://websystique.com/hibernate/hibernate-many-to-one-unidirectional-annotation-example/
4. 
   

jpa errors

1. https://stackoverflow.com/questions/39734796/jpa-concurrency-issue-on-release-of-batch-it-still-contained-jdbc-statements
2. Field 'DTYPE' doesn't have a default value

jhipster

1. https://www.jhipster.tech/
2. 
   

security

1. https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
2. 
   

IDE speed up

1. https://stackoverflow.com/questions/316265/how-can-you-speed-up-eclipse?rq=1
2. https://projectlombok.org/
3. 
   

aws codecommit

1. https://docs.aws.amazon.com/codecommit/latest/userguide/welcome.html
2. 
   

aws deployment from codecommit to elasticbeanstalk environment

1. https://aws.amazon.com/premiumsupport/knowledge-center/deploy-codecommit-elastic-beanstalk/
2. https://stackoverflow.com/questions/15645368/how-to-incrementally-deploy-to-amazon-beanstalk-from-eclipse
3. 
   

recaptcha v2

1. https://developers.google.com/recaptcha/docs/faq 
2. https://sanaulla.info/2017/11/10/using-google-recaptcha-with-spring-boot-application/ 
3. https://stackoverflow.com/questions/30832957/google-recaptcha-not-showing
4. https://stackoverflow.com/questions/27286232/how-does-new-google-recaptcha-work
5. https://www.quora.com/Why-does-Googles-new-reCaptcha-always-asks-me-to-solve-a-captcha
6. https://en.wikipedia.org/wiki/ReCAPTCHA
7. https://stackoverflow.com/questions/39853162/recaptcha-with-content-security-policy
8. https://trends.builtwith.com/cdn/GStatic-Google-Static-Content
9. https://github.com/google/recaptcha/issues/107
10. 
    

git add-all-files-to-a-commit-except-a-single-file

1. https://stackoverflow.com/questions/4475457/add-all-files-to-a-commit-except-a-single-file
2. 
   

jquery clearing textfield

1. .val() use to set/ get value in text field. With parameter it acts as setter and without parameter acts as getter.
2. https://stackoverflow.com/questions/10951809/clear-text-field-value-in-jquery
3. 
   

javascript undefined vs null

1. https://stackoverflow.com/questions/2559318/how-to-check-for-an-undefined-or-null-variable-in-javascript
2. https://www.thecodeship.com/web-development/the-undefined-vs-null-pitfall-in-javascript/
3. 
   

jquery ui autocomplete combobox

1. http://jqueryui.com/autocomplete/#combobox
2. https://stackoverflow.com/questions/21822731/jquery-ui-autocomplete-combobox-changed-not-firing
3. 
   

dynamic dropdown

1. http://rajnikantpanchal.blogspot.in/2013/10/dynamic-fill-dropdown-list-in-spring.html 
2. https://stackoverflow.com/questions/43848339/dynamic-dropdowns-using-thymeleaf-spring-boot
3. https://blog.bubble.is/how-to-build-dynamic-dropdown-elements-3ad6cb72cf5f
4. 
   

editable select

1. https://stackoverflow.com/questions/2141357/editable-select-element?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
2. 
   

spring data jpa reference

Table 4. Supported keywords inside method names

Keyword	Sample	JPQL snippet
And	findByLastnameAndFirstname	… where x.lastname = ?1 and x.firstname = ?2
Or	findByLastnameOrFirstname	… where x.lastname = ?1 or x.firstname = ?2
Is,Equals	findByFirstname,findByFirstnameIs,findByFirstnameEquals	… where x.firstname = ?1
Between	findByStartDateBetween	… where x.startDate between ?1 and ?2
LessThan	findByAgeLessThan	… where x.age < ?1
LessThanEqual	findByAgeLessThanEqual	… where x.age <= ?1
GreaterThan	findByAgeGreaterThan	… where x.age > ?1
GreaterThanEqual	findByAgeGreaterThanEqual	… where x.age >= ?1
After	findByStartDateAfter	… where x.startDate > ?1
Before	findByStartDateBefore	… where x.startDate < ?1
IsNull	findByAgeIsNull	… where x.age is null
IsNotNull,NotNull	findByAge(Is)NotNull	… where x.age not null
Like	findByFirstnameLike	… where x.firstname like ?1
NotLike	findByFirstnameNotLike	… where x.firstname not like ?1
StartingWith	findByFirstnameStartingWith	… where x.firstname like ?1 (parameter bound with appended %)
EndingWith	findByFirstnameEndingWith	… where x.firstname like ?1 (parameter bound with prepended %)
Containing	findByFirstnameContaining	… where x.firstname like ?1 (parameter bound wrapped in %)
OrderBy	findByAgeOrderByLastnameDesc	… where x.age = ?1 order by x.lastname desc
Not	findByLastnameNot	… where x.lastname <> ?1
In	findByAgeIn(Collection<Age> ages)	… where x.age in ?1
NotIn	findByAgeNotIn(Collection<Age> ages)	… where x.age not in ?1
True	findByActiveTrue()	… where x.active = true
False	findByActiveFalse()	… where x.active = false
IgnoreCase	findByFirstnameIgnoreCase	… where UPPER(x.firstame) = UPPER(?1)

recording screencast

1. http://recordit.co/
2.  

loading four most recent pictures

1. 
   

   
   
   <!doctype html>
   
   
   
   <html lang="en">
   
   
   
   <head>
   
   
   
     <meta charset="utf-8">
   
   
   
     <title>jQuery.getJSON demo</title>
   
   
   
     <style>
   
   
   
     img {
   
   
   
       height: 100px;
   
   
   
       float: left;
   
   
   
     }
   
   
   
     </style>
   
   
   
     <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
   
   
   
   </head>
   
   
   
   <body>
   
   
   
    
   
   
   
   <div id="images"></div>
   
   
   
    
   
   
   
   <script>
   
   
   
   (function() {
   
   
   
     var flickerAPI = "https://api.flickr.com/services/feeds/photos_public.gne?jsoncallback=?";
   
   
   
     $.getJSON( flickerAPI, {
   
   
   
       tags: "mount rainier",
   
   
   
       tagmode: "any",
   
   
   
       format: "json"
   
   
   
     })
   
   
   
       .done(function( data ) {
   
   
   
         $.each( data.items, function( i, item ) {
   
   
   
           $( "<img>" ).attr( "src", item.media.m ).appendTo( "#images" );
   
   
   
           if ( i === 3 ) {
   
   
   
             return false;
   
   
   
           }
   
   
   
         });
   
   
   
       });
   
   
   
   })();
   
   
   
   </script>
   
   
   
    
   
   
   
   </body>
   
   
   
   </html>
   
   

spring recaptcha integration

1. http://www.baeldung.com/spring-security-registration-captcha
2. 
   

jquery prop method

1. https://www.w3schools.com/jquery/html_prop.asp
2. 
   

spring data jpa

1. https://docs.spring.io/spring-data/jpa/docs/1.5.0.RC1/reference/html/jpa.repositories.html
2. 
   

mysql database of country,state,city

1. https://stackoverflow.com/questions/16020942/is-there-any-way-to-get-all-country-state-and-cities-mysql-data-a-dump-file
2. 
   

security

1. https://www.maxmind.com/en/minfraud-services
2. 
   

jquery opposite of append

1. https://stackoverflow.com/questions/4934488/opposite-of-append-in-jquery
2. 
   

javascript

1. https://stackoverflow.com/questions/2483429/how-to-use-outerhtml-in-javascript
2. 
   

javascript displaying object

1. https://stackoverflow.com/questions/957537/how-can-i-display-a-javascript-object
2. 
   

javascript return false

1. https://stackoverflow.com/questions/10729198/what-does-return-false-do
2. 
   

angular

1. https://stackoverflow.com/questions/32470928/angular-formly-adding-form-fields-dynamically-on-user-click
2. 
   

bootstrap

1. http://www.bootlint.com/
2.  

bootstrap css classes

1. https://www.w3schools.com/bootstrap/bootstrap_ref_all_classes.asp
2. 
   

html nesting of forms

1. https://stackoverflow.com/questions/379610/can-you-nest-html-forms
2. 
   

html role

1. https://stackoverflow.com/questions/10403138/what-is-the-purpose-of-the-role-attribute-in-html
2. 
   

spring mvc autocomplete example

1. http://www.codingpedia.org/ama/autocomplete-search-box-with-jquery-and-spring-mvc/
2. http://viralpatel.net/blogs/spring-3-mvc-autocomplete-json-tutorial/
3. https://www.mkyong.com/spring-mvc/spring-mvc-jquery-autocomplete-example/
4. https://stackoverflow.com/questions/46760315/spring-boot-autocomplete-ajax 
5.  

spring mvc ajax examples

1. http://www.raistudies.com/spring/spring-mvc/ajax-spring-mvc-3-annonations-jquery/
2. https://www.boraji.com/spring-4-mvc-jquery-ajax-form-submit-example
3. https://www.javacodegeeks.com/2013/09/spring-mvc-ajax-jquery.html
4. https://crunchify.com/how-to-use-ajax-jquery-in-spring-web-mvc-jsp-example/
5. https://vitalflux.com/make-ajax-calls-java-spring-mvc/
6. http://www.beingjavaguys.com/2013/07/sending-html-form-data-to-spring.html
7. http://www.mkyong.com/spring-mvc/spring-4-mvc-ajax-hello-world-example/
8. 
   

html polyfills

1. https://stackoverflow.com/questions/7087331/what-is-the-meaning-of-polyfills-in-html5
2. 
   

google sign in

1. https://dzone.com/articles/getting-started-with-google-sign-in-in-spring-boot
2. 
   

lookup-city-and-state-by-zip-google-geocode-api

1. https://stackoverflow.com/questions/4749706/lookup-city-and-state-by-zip-google-geocode-api/4749821
2. 
   

inventory system

1. http://smallbusiness.chron.com/implement-inventory-system-manufacturing-company-81005.html
2. 
   

Spring and Mongodb and Java

1. https://xpadro.com/?blogger=http://xpadro.blogspot.in/2014/02/thymeleaf-integration-with-spring-part-2.html
2. 
   

object references an unsaved transient instance

1. https://stackoverflow.com/questions/2302802/object-references-an-unsaved-transient-instance-save-the-transient-instance-be
2. i was getting the error when i was instantiating country which was not linked to database row and using this country as a parameter for fetching states. so i  used string country name and got the reference of country in the database and used this country as parameter to fetch the states then it worked.
3. 
   

thymeleaf with servlet

1. https://www.concretepage.com/thymeleaf/thymeleaf-form-action-form-submit-and-image-src-example-with-attribute-values
2. 
   

spring boot ajax example

1. https://www.mkyong.com/spring-boot/spring-boot-ajax-example/
2. 
   

spring boot json thymeleaf fragment example

1. https://stackoverflow.com/questions/20982683/spring-mvc-3-2-thymeleaf-ajax-fragments?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
2. https://www.thymeleaf.org/doc/articles/layouts.html
3. 
   

JPA doubts

1. what happens when new entities and attributes are defined in a production database that has thousands of data. what are the implications?
2. 
   

json in spring boot

1. https://stackoverflow.com/questions/44839753/returning-json-object-as-response-in-spring-boot?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
2. https://stackoverflow.com/questions/40874012/object-to-json-serialization-inside-thymeleaf-template?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
3. 
   

spring boot thymeleaf example

1. https://medium.com/@grokwich/spring-boot-thymeleaf-html-form-handling-762ef0d51327
2. 
   

spring mvc error

Problem:
Neither BindingResult nor plain target object for bean name 'country' available as request attribute
Solution:
instantiate country and add as attribute in model map.

country details

1. https://countrycode.org/
2. 
   

thymeleaf form select option example

1. https://o7planning.org/en/11659/thymeleaf-form-select-option-example
2. 
   

spring mvc dropdown example

1. https://www.mkyong.com/spring-mvc/spring-mvc-dropdown-box-example/
2. 
   

smart home

1. wemo belkin switch
2. amazon alexa
3. 
   

aws useful resources

1. route 53 
2. IAM role
3. s3
4. elastic beanstalk
5. sns
6. cloudwatch
7. rds
8. ec 2
9. 
   

aws sms through sns

1. https://docs.aws.amazon.com/sns/latest/dg/sms_publish-to-phone.html
2. 
   

aws elastic beanstalk application deletion

1. when the aws elastic bean application is deleted rds instance is automatically deleted
2. ec2 instance is also deleted
3. s2 bucket content should be deleted because it is not deleted automatically
4. 
   

calling javascript function on page load

1. https://stackoverflow.com/questions/3842614/how-do-i-call-a-javascript-function-on-page-load
2. 
   

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.