Hello! Hola! Hej!

If you just want to know if an object is an instance of or extends a certain class, or implements a certain interface, you can use the instanceof keyword. public void myMethod(Object obj) { if (obj instanceof String) { System.out.println("It's a String"); } else { System.out.println("It's not a String"); } } https://coderanch.com/t/404450/java/type-object how can I get the type of the object ? (..

Backend/Java&Spring Framework 2019. 10. 13. 18:42

Message : 'System.Web.HttpUnhandledException' 형식의 예외가 Throw되었습니다. 원격 호스트에서 연결을 닫았습니다. 오류 코드는 0x800703E3입니다. 위치: System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect).... This exception indicates that the user closed the connection before the file had finished downloading by closing his/her browser or navigating to another page. Users never see this..

Backend/.NET Framework 2019. 4. 22. 09:33

테스트 서버 만들어서 사용하려고 AWS FREE TIRE 사용하려다가... 가입할때 Developer Support가 눌러졌나보다... 나도 모르게 2.8USD가 결제되서..ㅜㅜ 바로 취소..ㅠㅠ https://aws.amazon.com/ko/premiumsupport/knowledge-center/cancel-support-plan/ You’ll automatically receive a prorated refund for the remainder of your current month’s support charge to the payment method it was originally charged to, usually within a week. 결제한 후에 바로 PLAN을 바꾸면 환불된다는데.. 우..

Backend/AWS 2017. 3. 29. 21:16

java.net.UnknownHostException: Unable to resolve host : No address associated with hostname 테스트할 기기에 인터넷 연결 안해두고,, 인터넷 요청을 해버림...ㅍㅎㅎ 외국에선 간혹 wifi bug라고 하긴 하지만.. Stack Overflow - Where Developers Learn, Share, & Build Careers Stack Overflow | The World’s Largest Online Community for Developers stackoverflow.com

Backend/Java&Spring Framework 2016. 8. 20. 15:24

# .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){ public void onClick(DialogInterface dialog, int which) { result.confirm(); } }).create(); lamda .setPositiveButton(android.R.string.ok, (dialog, which) -> { result.confirm(); }).create();

Backend/Java&Spring Framework 2016. 8. 18. 14:56

Driver must not be null Cannot convert value of type [java.lang.String] to required type [java.sql.Driver] for property 'driver': no matching editors or conversion strategy found java.lang.IllegalArgumentException: Cannot find class [com.edb.Driver] 1. 프로젝트 build path에 로컬경로로 넣어줌.2. 로컬경로로 인식이 안되는 경우도 있다고 하여 webapp > WEB-INF > spring > lib 폴더 생성 > jdbc파일 추가3. 프로젝트 build path로 위경로 인식함.4. 안됨... 톰캣 이..

Backend/Java&Spring Framework 2015. 7. 14. 11:09

BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext org.springframework spring-beans ${org.springframework-version} Injection of autowired dependencies failed Could not autowire field @Repository("iMeasureDAO") 잘못선언되어잇었음 Result Maps collection does not contain value -> Could not find result map com.spring.myapp.book.model.Measure] with..

Backend/Java&Spring Framework 2015. 7. 14. 09:12

https://jdbc.postgresql.org/documentation/publicapi/org/postgresql/ds/PGConnectionPoolDataSource.htmlproperty 확인 In any case, in order to use this ConnectionPoolDataSource, you must set the property databaseName. The settings for serverName, portNumber, user, and password are optional. Note: these properties are declared in the superclass. No bean class specified on bean definition - Spring Foru..

Backend/Java&Spring Framework 2015. 7. 9. 17:27

postgreSQL Database Cluster Initialisation Failed... 문제계속 이래서 왜그런지 몰랐는데... 보안때문에 특정 폴더 예)Programs files 같은 폴더에 생성이 안되도록 하는 것이 있단다.. 윈도우 vista 이후에서부터는...그래서 관리자 권한으로 실행해도 안되고,, 계속 database cluster 만들때 오류가 났던것... 해결* Data Directory 와 WAL Directory를 c:\Programs Files\ 로 하지말고, 다른 경로에 지정하자! 그럼 해결^.^ 참고http://www.geekscribes.net/blog/2009/04/22/postgresql-database-cluster-initialisation-failed-solution/

Backend/Java&Spring Framework 2015. 7. 8. 14:49

The ResourceConfig instance does not contain any root resource classes. web.xml 안에 Jersey Web Application com.pretech/* 위에 구조가 package 이름과 맞춰져야 한다.

Backend/Java&Spring Framework 2015. 7. 2. 09:34