the

the

关注
发信
LWP:UserAgent 500错误
在Python测试中从Python脚本获取输出
AJAX提交jQuery通过多种形式
如何获取带有视频标题的youtube播放列表视频ID
Python JSON编码器改为将NaN转换为'null'
如何在ASP.NET Web应用程序中的服务器和客户端之间进行通信?
您可以流式传输已成为“热门"的帖子吗?
如何为casper.repeat具有可变值
帮我找到算法，以解决这个问题
为重载运算符派生类的正确方法是什么？
对基类和派生类使用静态容器
如何Bitmap.Save（流，的imageformat）格式化的数据？
为什么我得到使用本C code分段错误？
如何从文档目录加载PDF？
[错误] WinRT信息：无法打开设备的句柄。当试图打开LED的Pin时

线程"restartedMain"中的异常； java.lang.reflect.InvocationTargetException原因:java.lang.NullPointerException

扫码查看
本文介绍了线程"restartedMain"中的异常； java.lang.reflect.InvocationTargetException原因:java.lang.NullPointerException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用SpringBoot，Hibernate应用程序，而当我尝试运行该应用程序时.我收到错误线程"restartedMain"中的异常java.lang.reflect.InvocationTargetException"

I am working on SpringBoot, Hibernate application and when I am trying to the run the application. I am getting error "Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException"

我得到的错误日志:

Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.NullPointerException
    at com.spring.main.SpringLogging3Application.data(SpringLogging3Application.java:97)
    at com.spring.main.SpringLogging3Application.main(SpringLogging3Application.java:53)
    ... 5 more

下面是我要运行的源代码.只需假设我有两个实体类问与答"，即它的getter和setter方法.

Below is the source code that I am trying to run. Just assume that I am having two entity classes Question and Answer with it's getter and setter methods.

import java.util.ArrayList;
import java.util.Properties;

import javax.sql.DataSource;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;

@SpringBootApplication
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class,DataSourceTransactionManagerAutoConfiguration.class})
@ComponentScan("com.spring.main")
public class SpringLogging3Application {

    @Autowired
    static SessionFactory factory;

    @Value("${db.driver}")
    private String DB_DRIVER;
    @Value("${db.url}")
    private String DB_URL;
    @Value("${db.username}")
    private String DB_USERNAME;
    @Value("${db.password}")
    private String DB_PASSWORD;
    @Value("${hibarenate.dialect}")
    private String HIBERNATE_DIALECT;
    @Value("${hibarenate.show_sql}")
    private String HIBERNATE_SHOW_SQL;
    @Value("${hibarenate.hbm2ddl.auto}")
    private String HIBERNATE_HBM2DDL_AUTO;
    @Value("${entitymanager.packagesToScan}")
    private String ENTITYMANAGER_PACKAGES_TOSCAN;


    public static void main(String[] args) {
        SpringApplication.run(SpringLogging3Application.class, args);
        data();
    }
@Autowired
@Bean(name = "sessionFactory")
public SessionFactory getSessionFactory(DataSource datasource) throws Exception {

        Properties hibernateproperties = new Properties();


        hibernateproperties.put("hibarenate.dialect", HIBERNATE_DIALECT);
        hibernateproperties.put("hibarenate.show_sql", HIBERNATE_SHOW_SQL);
        hibernateproperties.put("hibarenate.hbm2ddl.auto", HIBERNATE_HBM2DDL_AUTO);

        LocalSessionFactoryBean factorybean = new LocalSessionFactoryBean();
        factorybean.setDataSource(dataSource());
        factorybean.setPackagesToScan(ENTITYMANAGER_PACKAGES_TOSCAN);
        factorybean.setHibernateProperties(hibernateproperties);

        factorybean.afterPropertiesSet();

        SessionFactory sf = factorybean.getObject();
        System.out.println("##getSessionFactory" +sf);
        return sf;
    }
@Autowired
@Bean(name="datasource")
public DataSource dataSource() {
    DriverManagerDataSource datasources = new DriverManagerDataSource();
    datasources.setDriverClassName(DB_DRIVER);
    datasources.setUrl(DB_URL);
    datasources.setUsername(DB_USERNAME);
    datasources.setPassword(DB_PASSWORD);
     System.out.println("## getDataSource: " +datasources);
    return datasources;
}
@Autowired
@Bean(name="transactrionManager")
public HibernateTransactionManager getTransactionManager(SessionFactory sessionfactory) {
    HibernateTransactionManager manager = new HibernateTransactionManager(sessionfactory);
    //manager.setSessionFactory(sessionFactory().getObject());
    return manager;
}

public static void data() {
    Session session = factory.openSession();
    Transaction t = session.beginTransaction();

    Answer an1=new Answer();
    an1.setAnswername("Java is programming language");
    an1.setPostedBy("Ravi Malik");

    Answer an2=new Answer();
    an2.setAnswername("Java is a platform");
    an2.setPostedBy("Sudhir Kumar");

    Question q1=new Question();
    q1.setQuestion("What is Java?");
    ArrayList<Answer> l1=new ArrayList<Answer>();
    l1.add(an1);
    l1.add(an2);
    q1.setAnswer(l1);


      Answer ans3=new Answer();
        ans3.setAnswername("Servlet is an Interface");
        ans3.setPostedBy("Jai Kumar");

        Answer ans4=new Answer();
        ans4.setAnswername("Servlet is an API");
        ans4.setPostedBy("Arun");

    Question q2=new Question();
    q2.setQuestion("What is Servlet?");
    ArrayList<Answer> l2=new ArrayList<Answer>();
    l2.add(ans3);
    l2.add(ans4);
    q2.setAnswer(l2);

    session.persist(q1);
    session.persist(q2);

    t.commit();
    session.close();
    System.out.println("Success");
}

}

更新的代码-实施commandlineRunner之后

Updated code - After implementing commandlineRunner

@SpringBootApplication
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class,DataSourceTransactionManagerAutoConfiguration.class})
@ComponentScan("com.spring.main")
public class SpringLogging3Application implements CommandLineRunner {

    SessionFactory factory;

    @Value("${db.driver}")
    private String DB_DRIVER;
    @Value("${db.url}")
    private String DB_URL;
    @Value("${db.username}")
    private String DB_USERNAME;
    @Value("${db.password}")
    private String DB_PASSWORD;
    @Value("${hibarenate.dialect}")
    private String HIBERNATE_DIALECT;
    @Value("${hibarenate.show_sql}")
    private String HIBERNATE_SHOW_SQL;
    @Value("${hibarenate.hbm2ddl.auto}")
    private String HIBERNATE_HBM2DDL_AUTO;
    @Value("${entitymanager.packagesToScan}")
    private String ENTITYMANAGER_PACKAGES_TOSCAN;

    @Autowired
    @Bean(name = "sessionFactory")
    public SessionFactory getSessionFactory(DataSource datasource) throws Exception {

            Properties hibernateproperties = new Properties();


            hibernateproperties.put("hibarenate.dialect", HIBERNATE_DIALECT);
            hibernateproperties.put("hibarenate.show_sql", HIBERNATE_SHOW_SQL);
            hibernateproperties.put("hibarenate.hbm2ddl.auto", HIBERNATE_HBM2DDL_AUTO);

            LocalSessionFactoryBean factorybean = new LocalSessionFactoryBean();
            factorybean.setDataSource(dataSource());
            factorybean.setPackagesToScan(ENTITYMANAGER_PACKAGES_TOSCAN);
            factorybean.setHibernateProperties(hibernateproperties);

            factorybean.afterPropertiesSet();

            SessionFactory sf = factorybean.getObject();
            System.out.println("##getSessionFactory" +sf);
            return sf;
        }

    @Autowired
    @Bean(name="datasource")
    public DataSource dataSource() {
        DriverManagerDataSource datasources = new DriverManagerDataSource();
        datasources.setDriverClassName(DB_DRIVER);
        datasources.setUrl(DB_URL);
        datasources.setUsername(DB_USERNAME);
        datasources.setPassword(DB_PASSWORD);
         System.out.println("## getDataSource: " +datasources);
        return datasources;
    }

    @Autowired
    @Bean(name="transactrionManager")
    public HibernateTransactionManager getTransactionManager(SessionFactory sessionfactory) {
        HibernateTransactionManager manager = new HibernateTransactionManager(sessionfactory);
        //manager.setSessionFactory(sessionFactory().getObject());
        return manager;
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringLogging3Application.class, args);

    }

    @Override
    public void run(String... args) throws Exception {
        System.out.println("Inside run method");

        Session session = factory.openSession();
        Transaction t = session.beginTransaction();

        Answer an1=new Answer();
        an1.setAnswername("Java is programming language");
        an1.setPostedBy("Ravi Malik");

        Answer an2=new Answer();
        an2.setAnswername("Java is a platform");
        an2.setPostedBy("Sudhir Kumar");

        Question q1=new Question();
        q1.setQuestion("What is Java?");
        ArrayList<Answer> l1=new ArrayList<Answer>();
        l1.add(an1);
        l1.add(an2);
        q1.setAnswer(l1);


          Answer ans3=new Answer();
          ans3.setAnswername("Servlet is an Interface");
          ans3.setPostedBy("Jai Kumar");

          Answer ans4=new Answer();
          ans4.setAnswername("Servlet is an API");
          ans4.setPostedBy("Arun");

        Question q2=new Question();
        q2.setQuestion("What is Servlet?");
        ArrayList<Answer> l2=new ArrayList<Answer>();
        l2.add(ans3);
        l2.add(ans4);
        q2.setAnswer(l2);

        session.persist(q1);
        session.persist(q2);

        t.commit();
        session.close();
        //return "Success";
    }
}

推荐答案

问题是这个.

@Autowired
static SessionFactory factory;

您不能自动连接静态字段.

You can not auto wire static fields.

这篇关于线程"restartedMain"中的异常； java.lang.reflect.InvocationTargetException原因:java.lang.NullPointerException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

09-05 12:22
查看更多
Powered by LMLPHP ©2025 the 0.041267