无法实例化 [org.springframework.orm.hibernate5.LocalSessionFactoryBean]：工厂方法'sessionFactory'引发异常

Question

我在项目中实现hibernate时遇到问题。我在说时出错

java.lang.NullPointerException in sessionFactory

下面是错误日志和配置文件。请不要建议我使用xml类型的配置。

错误日志为：

{"logType":"DEBUG",
"logLevel":"ERROR",
"logTimestamp":"2021-09-11T20:28:48.936-05:00",
"logger":"org.springframework.boot.SpringApplication",
"label":"Application run failed",
"runtime": {
"instance":"unknown",
"clusterName":"unknown",
"namespace":"unknown",
"image":"unknown",
"platformIdentifier":"AJSC7_JERSEY"},
"application": {
"deploymentUnitName":"com.att.dmp.ReorgResourceCreatorMs",
"motsApplicationAcronym":"MOTS_ID"},
"exception": {
"exceptionDetails": 
"Error creating bean with name 'sessionFactory' defined in
class path resource [com/att/dmp/DBConfiguration.class]: 
Bean instantiation via factory method failed; nested 
exception is: org.springframework.beans.BeanInstantiationException: 
Failed to instantiate
[org.springframework.orm.hibernate5.LocalSessionFactoryBean]: 
Factory method 'sessionFactory' threw exception; 
nested exception is java.lang.NullPointerException",
"stackTrace":
"org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'sessionFactory' defined in 
class path resource [com/att/dmp/DBConfiguration.class]: 
Bean instantiation via factory method failed; nested exception is 
org.springframework.beans.BeanInstantiationException: Failed to instantiate
[org.springframework.orm.hibernate5.LocalSessionFactoryBean]:
Factory method 'sessionFactory' threw exception; 
nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:656)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:484)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:860)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
at com.att.dmp.Application.main(Application.java:20)
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: org.springframework.beans.BeanInstantiationException:
Failed to instantiate [org.springframework.orm.hibernate5.LocalSessionFactoryBean]: 
Factory method 'sessionFactory' threw exception; 
nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:651)
... 24 more
Caused by: java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:364)
at org.springframework.core.env.MapPropertySource.getProperty(MapPropertySource.java:42)
at com.ulisesbocchio.jasyptspringboot.EncryptablePropertySource.getProperty(EncryptablePropertySource.java:13)
at com.ulisesbocchio.jasyptspringboot.wrapper.EncryptableMapPropertySourceWrapper.getProperty(EncryptableMapPropertySourceWrapper.java:29)
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:85)
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:62)
at org.springframework.core.env.AbstractPropertyResolver.getRequiredProperty(AbstractPropertyResolver.java:181)
at org.springframework.core.env.AbstractEnvironment.getRequiredProperty(AbstractEnvironment.java:556)
at com.att.dmp.DBConfiguration.sessionFactory(DBConfiguration.java:108)
at com.att.dmp.DBConfiguration$$EnhancerBySpringCGLIB$$72a5f978.CGLIB$sessionFactory$0(<generated>)
at com.att.dmp.DBConfiguration$$EnhancerBySpringCGLIB$$72a5f978$$FastClassBySpringCGLIB$$f4df2065.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
at com.att.dmp.DBConfiguration$$EnhancerBySpringCGLIB$$72a5f978.sessionFactory(<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:154)
... 25 more"
}
}

DBConfiguration.Java

import javax.annotation.Resource;
import javax.sql.DataSource;
import java.util.Properties;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.core.env.Environment;

@Configuration
@PropertySource("classpath:/propertyLoader/InsertQueries.properties")
@PropertySource("classpath:/propertyLoader/SelectQueries.properties")
@PropertySource("classpath:/propertyLoader/UpdateQueries.properties")
public class DBConfiguration {
private static Logger logger = LogManager.getLogger(DBConfiguration.class);
@Value("${spring.datasource.jdbcUrl}")
private String url;
@Value("${spring.datasource.username}")
private String userName;
@Value("${spring.datasource.password}")
private String password;
@Value("${spring.datasource.driver-class-name}")
private String dbDriverClassName;

@Value("${hibernate.dialect}")
private String hibernateDialect;

@Value("${hibernate.show_sql}")
private String hibernateShowSql;

@Value("${hibernate.hbm2ddl.auto}")
private String hibernateHbm2ddlAuto;

@Value("${entitymanager.packages.to.scan}")
private String entitymanagerPackagesToScan;

private String PROPERTY_NAME_HIBERNATE_DIALECT = hibernateDialect;
private String PROPERTY_NAME_HIBERNATE_SHOW_SQL = hibernateShowSql;
private String PROPERTY_NAME_HIBERNATE_HBM2DDL_AUTO = hibernateHbm2ddlAuto;
private String PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN = entitymanagerPackagesToScan;

@Resource
private Environment env;
@Bean(name = "dataSource")
public DataSource dataSource() {
logger.info("loading configuration : url : {}, userName ; {}, password ;{}", url, userName, password);
BasicDataSource dataSource = new BasicDataSource();
dataSource.setUrl(url);
dataSource.setDriverClassName(dbDriverClassName);
dataSource.setUsername(userName);
dataSource.setPassword(password);
dataSource.setRemoveAbandoned(true);
dataSource.setInitialSize(10);
dataSource.setMaxActive(30);
return dataSource;
}
@Bean(name = "jdbcOperations")
public JdbcTemplate jdbcOperations() {
JdbcTemplate jdbcTemplate = new JdbcTemplate();
jdbcTemplate.setDataSource(dataSource());
jdbcTemplate.setFetchSize(500);
return jdbcTemplate;
}
@Bean(name = "jdbcNamedOperations")
public NamedParameterJdbcTemplate jdbcNamedOperations() {
NamedParameterJdbcTemplate namedTemplate = new NamedParameterJdbcTemplate(jdbcOperations());
return namedTemplate;
}

@Bean (name = "sessionFactory")
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
sessionFactoryBean.setDataSource(dataSource());
sessionFactoryBean.setPackagesToScan(env.getRequiredProperty(PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN));
sessionFactoryBean.setHibernateProperties(hibProperties());
return sessionFactoryBean;
}

private Properties hibProperties() {
Properties properties = new Properties();
properties.put(PROPERTY_NAME_HIBERNATE_DIALECT, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
properties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));
properties.put(PROPERTY_NAME_HIBERNATE_HBM2DDL_AUTO, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_HBM2DDL_AUTO));
return properties;  
}

@Bean(name = "transactionManager") 
public HibernateTransactionManager transactionManager() {
HibernateTransactionManager transactionManager = new HibernateTransactionManager();
transactionManager.setSessionFactory(sessionFactory().getObject());
return transactionManager;
}

}

应用程序属性

#Hibernate Configuration:
hibernate.dialect=org.hibernate.dialect.OracleDialect
hibernate.show_sql=true
hibernate.hbm2ddl.auto=update
entitymanager.packages.to.scan=com.att.dmp.entity

Answer 1

您已经将不带@Value的字段分配给了带的字段，并在代码中使用了这些字段。

这些字段中的每一个都是空的，并且不是由Springboot 注入的

然后在env.getRequiredProperty中使用一个null值，该值抛出用于null查找的NPE

解决方案：不重复字段

Spring属性可以引用环境变量，所以您不应该在代码中这样做

例如

hibernate.show_sql=§{HIBERNATE_SHOW_SQL:true}