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

Driver must not be null
  <property name="driver" value="com.edb.Driver" />

Cannot convert value of type [java.lang.String] to required type [java.sql.Driver] for property 'driver': no matching editors or conversion strategy found

<property name="driverClass" value="com.edb.Driver" />

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 추가

3. 프로젝트 build path로 위경로 인식함.

4. 안됨... 톰캣 이것저것만지다가

5. Run configration > classpath > User Entries > Add External JARs > jdbc 파일 추가 하니까 된다!!!!!

와ㅜㅜ이걸로보낸 시간이 얼마여............ㅜㅜ

There is no setter for property named 'seq' in 'class com.restful.test.model.Measure'

* Measure에 변수선언, set, get 등록 안함..

** extends 는 java에서는 변수명이 될 수 없음 (Syntax error on token "extends", invalid VariableDeclarator)

extends_etc로 변수명 선언

There is no setter for property named 'extends' in 'class com.restful.test.model.Measure'

sql.xml

 <result column="extends_etc" property="extends_etc"/>

바꾼 변수명으로 연결시켜줘야함.

====================== 이제 드디어 정상동작!! ===================================

HTTP Status 404 - /test/WEB-INF/views/lists.jsp

controller 에 return 값을 ##@#.jsp 명으로!

return "home";

HTTP Status 500 - An exception occurred processing JSP page /WEB-INF/views/home.jsp at line 24

Property 'values' not found on type com.restful.test.model.Measure

jstl 객체뿌려주는 곳에

        <td>${lists.date}</td> ->      <td>${lists.input_dt}</td>
        <td>${lists.extends}</td> -> <td>${lists.extends_etc}</td>

한번에 좀 바꿔줍시다!

====================== 이제 드디어 정상동작!! ===================================

근데 왜 values가 안나오지..?  

java 대소문자 구문한다... (확실한가... Values -> values 로 변경)

====================== 이제 드디어 정상동작!! ===================================

http://localhost:8080/test/list

BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext

    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>


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 root cause
Result Maps collection does not contain value for com.restful.test.model.Measure

    <resultMap  id="AllMemberList" type="com.restful.test.model.Measure"> 
               <result column="seq" property="seq"/>
               <result column="key" property="key"/>
               <result column="contents" property="contents"/>
               <result column="input_dt" property="input_dt"/>
               <result column="extends" property="extends"/>
        </resultMap>
       
        <!-- parameterType="int"  where seq = #{seq} -->
       
        <select id="getMeasureList" resultMap="AllMemberList" >
               select seq, key, values, input_dt, extends
               from measures
        </select>

위에 부분을 지정안해줌
http://hyeonstorage.tistory.com/283

https://jdbc.postgresql.org/documentation/publicapi/org/postgresql/ds/PGConnectionPoolDataSource.html

property 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 Forum

http://stackoverflow.com/questions/20544963/java-lang-illegalstateexception-no-bean-class-specified-on-bean-definition

nested exception is java.lang.ClassNotFoundException: com.edb.ds.PGConnectionPoolDataSource

Could not load properties; nested exception is java.io.FileNotFoundException: Could not open ServletContext resource [/WEB-INF/dbpool.properties]

참고

http://www.geekscribes.net/blog/2009/04/22/postgresql-database-cluster-initialisation-failed-solution/

The ResourceConfig instance does not contain any root resource classes.

web.xml 안에 

 <servlet-name>Jersey Web Application</servlet-name>

  <url-pattern>com.pretech/*</url-pattern> 

위에 구조가 package 이름과 맞춰져야 한다. 

'Building workspace' has encountered an error"

Errors occurred during the build.

Errors running builder 'Maven Project Builder' on project 'RESTJerseyExample'.

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

<c:forEach items="${sdatas}" var="staff" varStatus="sdatas">

sdatas에 담겨진

index를 알고싶으면?  ${sdatas.index}

count를 알고싶으면? ${sdatas.count}

System.out.println("StaffList:"+jsonObject.names()+"::"+jsonObject.values());

swt Browser url 찾기

swt browser에서 url을 타면서 이동할 때 URL를 알아내는 방법

HTTP Status 500 -

The server encountered an internal error () that prevented it from fulfilling this request. 

The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application

------------------------------------------------------------------------------------------------------------------

이런 에러가 난다면??

1. JavaBeans를 잘 사용했는지 확인! (인터넷에서 열심히 찾아보자!)

2. 기존에 잘 됐었는데 갑자기 안되었다면????

  -> 톰캣을 너무많이 실행해서 톰켓안에서 꼬인것이다.ㅜㅜ.(test를 너무 많이 해서.)

그렇다면,, 이렇게 해보자!

String url = request.getRequestURL().toString();

  String[] str = url.split("/",7);

    String geturl = str[6];

  

   int page_size = 7;

   int group_size = 3;

   int totalCount;

   int pageCount;

   int curPage;

   

   if(reqPage==null){

   curPage=1;

   }else{

   curPage= Integer.parseInt(reqPage);

   }

  

<!-- 세션 -->

<!-- 로그인 안된 상태에서 uri을 통한 접근 방지 -->

<% String name=(String)session.getAttribute("username"); 

    String auth=(String)session.getAttribute("right"); 

    boolean sessionchk = name == null ? false : true;

    if(sessionchk == false){     System.out.println("baseurl :"+baseurl);

    out.println("<script>alert('로그인이 필요합니다.');");

    out.println("location.replace('"+baseurl+"/main.jsp');</script>");

    return;

    }

    %>