MySql에서 데이터베이스 테이블을 완료했습니다. 스프링 애플리케이션과 데이터베이스 사이의 연결이 필요합니다. 예를 들어, 편집 텍스트에 값을 삽입하고 있는데 데이터베이스 (MySql)에 저장할 수 있습니다 하지만 오류가 발생했습니다. 나는 봄에 새로 왔어. 도움이 필요해.스프링 데이터 소스의 java.lang.NullPointerException
다음은 내 오류 로그입니다.
16:05:44,784 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/SpringSample].[mvc-dispatcher]] (http-localhost/127.0.0.1:8080-1) Servlet.service() for servlet mvc-dispatcher threw exception: java.lang.NullPointerException
at com.rxoffice.test.controller.JDBCStudentDAO.findByStudentId(JDBCStudentDAO.java:65) [classes:]
at com.rxoffice.test.controller.Home.hi(Home.java:33) [classes:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_32]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [rt.jar:1.6.0_32]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [rt.jar:1.6.0_32]
at java.lang.reflect.Method.invoke(Method.java:597) [rt.jar:1.6.0_32]
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) [spring-web-3.0.5.RELEASE.jar:3.0.5.RELEASE]
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE]
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [jboss-servlet-api_3.0_spec-1.0.1.Final.jar:1.0.1.Final]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.1.Final.jar:1.0.1.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.17.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.17.Final.jar:]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.17.Final.jar:]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.17.Final.jar:]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:165) [jboss-as-web-7.1.3.Final.jar:7.1.3.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.17.Final.jar:]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.17.Final.jar:]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.17.Final.jar:]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:372) [jbossweb-7.0.17.Final.jar:]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.17.Final.jar:]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:679) [jbossweb-7.0.17.Final.jar:]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:931) [jbossweb-7.0.17.Final.jar:]
at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_32]
내 파일은 다음과 같습니다.
JDBCStudentDAO.java은 - 당신이 코멘트에 언급 된 바와 같이
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
public class JDBCStudentDAO implements StudentDAO {
/*@Autowired
DataSource dataSource;*/
private DataSource dataSource;
JdbcTemplate jdbcTemplate;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
@Override
public void insert(Student student) {
// TODO Auto-generated method stub
String sql = "INSERT INTO student_info " + "(id , name) VALUES (?, ?)";
Connection conn = null;
try {
conn = dataSource.getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, student.getId());
ps.setString(2, student.getName());
ps.executeUpdate();
ps.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {}
}
}
}
@Override
public Student findByStudentId(int stdId) {
// TODO Auto-generated method stub
String sql = "SELECT * FROM student_info WHERE id = ?";
Connection conn = null;
try {
conn = dataSource.getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, stdId);
Student student = null;
ResultSet rs = ps.executeQuery();
if (rs.next()) {
student = new Student(
rs.getInt("id"),
rs.getString("name")
);
}
rs.close();
ps.close();
return student;
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {}
}
}
}
'JDBCStudentDAO'는 65 행 쯤에 어떻게 생겼습니까? – holmis83
나는 StudentDAO 및 JDBCStudentDAO가 있습니다 – Harshad07
@ holmis83 내 게시물과 오류 파일을 편집했습니다. – Harshad07