Неудовлетворенная зависимость, выраженная через параметр конструктора 0 в Springboot - PullRequest
Новая
       6

Неудовлетворенная зависимость, выраженная через параметр конструктора 0 в Springboot

0 голосов
/ 13 июля 2020

Я получаю эту ошибку в первый раз при выполнении приведенного ниже кода на платформе Springboot. Я искал эту ошибку, и в некоторых местах предлагалось добавить @Component, но он уже есть.

В этом коде я просто выбираю несколько записей из промежуточной таблицы и распечатываю их. Структура таблицы определяется как отдельный класс, как указано ниже. Я получаю эту ошибку только при запуске, поэтому все эти logi c на данный момент не запускаются.

Ошибка: 

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'applicationMainTblLoadRun': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'payConsumerMainTblLoad' defined in file [C:\Users\Documents\workspace-sts-3.9.1.RELEASE\pe_enrollment_kafkaV3\target\classes\com\example\consumer\PayConsumerMainTblLoad.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.example.consumer.PayConsumerMainTblLoad]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:797) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:227) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1358) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:893) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE]
    at com.example.consumer.ApplicationMainTblLoadRun.main(ApplicationMainTblLoadRun.java:22) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.3.1.RELEASE.jar:2.3.1.RELEASE]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'payConsumerMainTblLoad' defined in file [C:\Users\Documents\workspace-sts-3.9.1.RELEASE\target\classes\com\example\consumer\PayConsumerMainTblLoad.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.example.consumer.PayConsumerMainTblLoad]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1320) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1304) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1224) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:884) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:788) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    ... 25 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.example.consumer.PayConsumerMainTblLoad]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:217) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1312) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    ... 37 common frames omitted
Caused by: java.lang.NullPointerException: null
    at com.example.consumer.PayConsumerMainTblLoad.<init>(PayConsumerMainTblLoad.java:29) ~[classes/:na]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_131]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_131]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_131]
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:204) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    ... 39 common frames omitted

Моя иерархия кодов: 

ApplicationMainTblLoadRun
 -- PayConsumerMainTblLoad
    -- PayConsumerEnrollmentDetails

ApplicationMainTblLoadRun: 

package com.example.consumer;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;


@SpringBootApplication
public class ApplicationMainTblLoadRun {
    
    @Autowired
    private static PayConsumerMainTblLoad mainTblLoad;
    
    public ApplicationMainTblLoadRun(PayConsumerMainTblLoad mainTblLoad){
        
        ApplicationMainTblLoadRun.mainTblLoad = mainTblLoad;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        SpringApplication.run(ApplicationMainTblLoadRun.class, args);
        
        mainTblLoad.dbLoadMaintable();

    }

    
}

PayConsumerMainTblLoad: 

package com.example.consumer;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Component;

@Component
public class PayConsumerMainTblLoad {
    
    private static String id        ;
    private static String id_type   ;
    private static String vp_ind        ;
    private static String ah_ind        ;
    private static String eff_dt        ;
    private static String end_dt        ;
    private static String err_val       ;
    
    @Autowired
    PayOracleDBConfig dbConfig;
    
    //Set datasource for jdbcTeample
    DataSource dataSource = dbConfig.dataSource();
    JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
    
    public void dbLoadMaintable() {
        
        //Fetch unprocessed records from staging table
        String sql = "SELECT id, id_type, vp_ind, ah_ind, eff_dt, end_dt "
                + "FROM fsg_prcb_file_stg WHERE process_flg = 'I'";
    
        
        RowMapper<PayConsumerEnrollmentDetails> rowMapper = new RowMapper<PayConsumerEnrollmentDetails>(){

            @Override
            public PayConsumerEnrollmentDetails mapRow(ResultSet result, int row ) throws SQLException {
                // TODO Auto-generated method stub
                
                id          = result.getString("id");
                id_type     = result.getString("id_type");
                vp_ind      = result.getString("vp_ind");
                ah_ind      = result.getString("ah_ind");
                eff_dt      = result.getString("eff_dt");
                end_dt      = result.getString("end_dt");
                
                return new PayConsumerEnrollmentDetails(id, id_type, vp_ind, ah_ind, eff_dt, end_dt);
            }
            
        };
        
        List<PayConsumerEnrollmentDetails> enrolDetails = jdbcTemplate.query(sql, rowMapper);
        
        for (PayConsumerEnrollmentDetails enrolDetail: enrolDetails) {
            
            System.out.println(enrolDetail);
            
        }
    
    }
    

}

PayConsumerEnrollmentDetails: 

package com.example.consumer;

import org.springframework.stereotype.Component;

public class PayConsumerEnrollmentDetails {

    private String id;
    private String id_type;
    private String vp_ind;
    private String ah_ind;
    private String eff_dt;
    private String end_dt;

    public PayConsumerEnrollmentDetails(String id, String id_type, String vp_ind,
            String ah_ind, String eff_dt, String end_dt) {
        
        super();
        this.id = id;
        this.id_type = id_type;
        this.vp_ind = vp_ind;
        this.ah_ind = ah_ind;
        this.eff_dt = eff_dt;
        this.end_dt = end_dt;
    }

    public String getid() {
        return id;
    }

    public void setid(String id) {
        this.id = id;
    }

    public String getid_type() {
        return id_type;
    }

    public void setid_type(String id_type) {
        this.id_type = id_type;
    }

    public String getvp_ind() {
        return vp_ind;
    }

    public void setvp_ind(String vp_ind) {
        this.vp_ind = vp_ind;
    }

    public String getah_ind() {
        return ah_ind;
    }

    public void setah_ind(String ah_ind) {
        this.ah_ind = ah_ind;
    }

    public String geteff_dt() {
        return eff_dt;
    }

    public void seteff_dt(String eff_dt) {
        this.eff_dt = eff_dt;
    }

    public String getend_dt() {
        return end_dt;
    }

    public void setend_dt(String end_dt) {
        this.end_dt = end_dt;
    }

}

1 Ответ

0 голосов
/ 13 июля 2020

Проблема здесь. 

DataSource dataSource = dbConfig.dataSource();

dbConfig - это управляемый экземпляр Spring. Но dataSource - нет. Таким образом, Spring не создает экземпляр PayOracleDBConfig, когда создается экземпляр DataSource. получение исключения нулевого указателя.

Предполагая, что существует Bean-компонент PayOracleDBConfig (через автоконфигурацию или определенный вами в каком-либо другом классе) , следующий код должен работать: 

@Component
public class PayConsumerMainTblLoad {

  //Your static variables
  

  private final JdbcTemplate jdbcTemplate;

  @Autowired
  public PayConsumerMainTblLoad(PayOracleDBConfig dbConfig){
    DataSource dataSource = dbConfig.dataSource();
    this.jdbcTemplate = new JdbcTemplate(dataSource);
  }

  //Your method and rest of the code


}
...