我正在尝试构建我找到here的网站，当我运行应用程序时，我得到了
在org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig中定义名称为'dataSource'的bean时出错：通过工厂方法进行Bean实例化失败;嵌套异常是org.springframework.beans.BeanInstantiationException：无法实例化[javax.sql.DataSource]：工厂方法'getDataSource'抛出异常;嵌套异常是java.lang.NullPointerException`
我查看了我的代码，问题似乎是关于应用程序没有连接到数据库的事实。当我尝试访问http://127.0.0.1:3306/paw时，它只是告诉我该页面无效。
ds-hibernate-cfg.properties
# DataSource
ds.database-driver=com.mysql.jdbc.Driver
ds.url=jdbc:mysql://127.0.0.1:3306/paw
ds.username=root
ds.password=
# Hibernate Config
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
current_session_context_class=thread
hibernate.hbm2ddl.auto=update
ApplicationContextConfig.java
package org.o7planning.springmvcshoppingcart.config;
import java.util.Properties;
import javax.sql.DataSource;
import com.mysql.jdbc.Driver;
import org.hibernate.SessionFactory;
import org.o7planning.springmvcshoppingcart.dao.impl.AccountDAO;
import org.o7planning.springmvcshoppingcart.dao.impl.OrderDAO;
import org.o7planning.springmvcshoppingcart.dao.impl.ProductDAO;
import org.o7planning.springmvcshoppingcart.dao.impl.AccountDAOImpl;
import org.o7planning.springmvcshoppingcart.dao.impl.OrderDAOImpl;
import org.o7planning.springmvcshoppingcart.dao.impl.ProductDAOImpl;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@ComponentScan("org.o7planning.springmvcshoppingcart.*")
@EnableTransactionManagement
// Load to Environment.
@PropertySource("classpath:ds-hibernate-cfg.properties")
public class ApplicationContextConfig {
// The Environment class serves as the property holder
// and stores all the properties loaded by the @PropertySource
private Environment env;
@Bean
public ResourceBundleMessageSource messageSource() {
ResourceBundleMessageSource rb = new ResourceBundleMessageSource();
// Load property in message/validator.properties
rb.setBasenames(new String[] { "messages/validator" });
return rb;
}
@Bean(name = "viewResolver")
public InternalResourceViewResolver getViewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/pages/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
// Config for Upload.
@Bean(name = "multipartResolver")
public CommonsMultipartResolver multipartResolver() {
CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
// Set Max Size...
// commonsMultipartResolver.setMaxUploadSize(...);
return commonsMultipartResolver;
}
@Bean(name = "dataSource")
public DataSource getDataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
// See: ds-hibernate-cfg.properties
dataSource.setDriverClassName(env.getProperty("ds.database-driver"));
dataSource.setUrl(env.getProperty("ds.url"));
dataSource.setUsername(env.getProperty("ds.username"));
dataSource.setPassword(env.getProperty("ds.password"));
System.out.println("## getDataSource: " + dataSource);
return dataSource;
}
@Bean(name = "sessionFactory")
public SessionFactory getSessionFactory(DataSource dataSource) throws Exception {
Properties properties = new Properties();
// See: ds-hibernate-cfg.properties
properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
properties.put("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
properties.put("current_session_context_class", env.getProperty("current_session_context_class"));
LocalSessionFactoryBean factoryBean = new LocalSessionFactoryBean();
// Package contain entity classes
factoryBean.setPackagesToScan(new String[] { "org.o7planning.springmvcshoppingcart.entity" });
factoryBean.setDataSource(dataSource);
factoryBean.setHibernateProperties(properties);
factoryBean.afterPropertiesSet();
//
SessionFactory sf = factoryBean.getObject();
System.out.println("## getSessionFactory: " + sf);
return sf;
}
@Bean(name = "transactionManager")
public HibernateTransactionManager getTransactionManager(SessionFactory sessionFactory) {
HibernateTransactionManager transactionManager = new HibernateTransactionManager(sessionFactory);
return transactionManager;
}
@Bean(name = "accountDAO")
public AccountDAO getApplicantDAO() {
return new AccountDAOImpl();
}
@Bean(name = "productDAO")
public ProductDAO getProductDAO() {
return new ProductDAOImpl();
}
@Bean(name = "orderDAO")
public OrderDAO getOrderDAO() {
return new OrderDAOImpl();
}
@Bean(name = "accountDAO")
public AccountDAO getAccountDAO() {
return new AccountDAOImpl();
}
我的完整错误日志
SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'getDataSource' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4937)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'getDataSource' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
... 23 more
Caused by: java.lang.NullPointerException
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig.getDataSource(ApplicationContextConfig.java:72)
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig$$EnhancerBySpringCGLIB$$9065b576.CGLIB$getDataSource$1(<generated>)
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig$$EnhancerBySpringCGLIB$$9065b576$$FastClassBySpringCGLIB$$21772b0c.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:355)
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig$$EnhancerBySpringCGLIB$$9065b576.getDataSource(<generated>)
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.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
... 24 more
May 25, 2017 8:41:08 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'getDataSource' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4937)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'getDataSource' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
... 23 more
Caused by: java.lang.NullPointerException
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig.getDataSource(ApplicationContextConfig.java:72)
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig$$EnhancerBySpringCGLIB$$9065b576.CGLIB$getDataSource$1(<generated>)
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig$$EnhancerBySpringCGLIB$$9065b576$$FastClassBySpringCGLIB$$21772b0c.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:355)
at org.o7planning.springmvcshoppingcart.config.ApplicationContextConfig$$EnhancerBySpringCGLIB$$9065b576.getDataSource(<generated>)
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.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
... 24 more
答案 0 :(得分：1)
从http://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/annotation/Configuration.html判断并查看您的代码，您可能在@Inject变量上遗漏了@Autowired或env。而且我不确定是否可以私密。它应该是：
@Inject Environment env;