我正在运行一个基于注释的配置项目，例如：
@Configuration
public class HibernateConfig {
private Map<String, String> map;
public HibernateConfig(){
init();
}
private void init(){
Properties props;
InputStream input = null;
try {
props = new Properties();
input = this.getClass().getClassLoader().getResourceAsStream("jdbc.properties");
props.load(input);
Enumeration<?> e = props.propertyNames();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
String value = props.getProperty(key);
map.put(key, value);
}
} catch (IOException e1) {
e1.printStackTrace();
} finally{
if(input!=null){
try {
input.close();
} catch (IOException e2) {
e2.printStackTrace();
}
}
}
}
@Bean(name="dataSource", destroyMethod = "close")
public DataSource getDataSource(){
ComboPooledDataSource dataSource = new ComboPooledDataSource();
try {
dataSource.setDriverClass(map.get("db.driverClass"));
dataSource.setJdbcUrl(map.get("db.jdbcUrl"));
dataSource.setUser(map.get("db.user"));
dataSource.setPassword(map.get("db.password"));
dataSource.setMaxPoolSize(50);
dataSource.setMinPoolSize(5);
dataSource.setMaxConnectionAge(1800);
dataSource.setMaxIdleTime(1800);
dataSource.setAutoCommitOnClose(false);
dataSource.setInitialPoolSize(5);
} catch (PropertyVetoException e) {
e.printStackTrace();
}
return dataSource;
}
@Bean(name="sessionFactory")
@Scope("singleton")
public FactoryBean<SessionFactory> getSessionFactory(@Qualifier("dataSource") javax.sql.DataSource dataSource){
LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
Properties hibernateProperties = new Properties();
hibernateProperties.setProperty("hibernate.dialect", map.get("db.dialect"));
hibernateProperties.setProperty("hibernate.jdbc.batch_size", "0");
hibernateProperties.setProperty("c3p0.acquire_increment", "1");
localSessionFactoryBean.setHibernateProperties(hibernateProperties);
try {
localSessionFactoryBean.afterPropertiesSet();
} catch (IOException e) {
e.printStackTrace();
}
return localSessionFactoryBean;
}
@Bean(name="transactionManager")
public HibernateTransactionManager getTransactionManager(@Qualifier("sessionFactory") SessionFactory sessionFactory){
HibernateTransactionManager transactionManager = new HibernateTransactionManager();
return transactionManager;
}
public Map<String, String> getMap() {
return map;
}
public void setMap(Map<String, String> map) {
this.map = map;
}
}
stackrace的输出给我以下异常：
ERROR ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com..web.config.HibernateConfig#0' defined in class path resource [META-INF/spring/daoContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050)
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$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$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:745)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:163)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098)
... 22 more
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at com..web.config.HibernateConfig.init(HibernateConfig.java:35)
at com..web.config.HibernateConfig.<init>(HibernateConfig.java:26)
at com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b.<init>(<generated>)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
... 24 more
Jun 16, 2017 2:55:14 PM org.apache.catalina.core.StandardContext listenerStart
SCHWERWIEGEND: 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 'com..web.config.HibernateConfig#0' defined in class path resource [META-INF/spring/daoContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050)
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$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$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:745)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:163)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098)
... 22 more
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at com..web.config.HibernateConfig.init(HibernateConfig.java:35)
at com..web.config.HibernateConfig.<init>(HibernateConfig.java:26)
at com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b.<init>(<generated>)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
... 24 more
INFO SessionListener - # flyway migration...
Jun 16, 2017 2:55:14 PM org.apache.catalina.core.StandardContext listenerStart
SCHWERWIEGEND: Exception sending context initialized event to listener instance of class com..web.listener.FlywayListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com..web.config.HibernateConfig#0' defined in class path resource [META-INF/spring/daoContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050)
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$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$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:745)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:163)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098)
... 22 more
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at com..web.config.HibernateConfig.init(HibernateConfig.java:35)
at com..web.config.HibernateConfig.<init>(HibernateConfig.java:26)
at com..web.config.HibernateConfig$$EnhancerBySpringCGLIB$$49b2842b.<init>(<generated>)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
... 24 more
我一直在寻找一个话题，谈论到目前为止我找不到的同一问题。有人有主意吗？
更新：添加了Stacktrace
最佳答案
您正在使用Spring，然后使用Spring。不要加载自己的属性，请使用@PropertySource。
删除您的init方法，并将其替换为@PropertySource，然后将Environment注入配置中，并使用它来检索属性。
@Configuration
@PropertySource("classpath:jdbc.properties")
public class HibernateConfig {
@Autowired
private Environment env;
@Bean
public DataSource dataSource(){
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass(env.getProperty("db.driverClass"));
dataSource.setJdbcUrl(env.getProperty("db.jdbcUrl"));
dataSource.setUser(env.getProperty("db.user"));
dataSource.setPassword(env.getProperty("db.password"));
dataSource.setMaxPoolSize(50);
dataSource.setMinPoolSize(5);
dataSource.setMaxConnectionAge(1800);
dataSource.setMaxIdleTime(1800);
dataSource.setAutoCommitOnClose(false);
dataSource.setInitialPoolSize(5);
return dataSource;
}
@Bean
public LocalSessionFactoryBean sessionFactory(DataSource dataSource){
LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
Properties hibernateProperties = new Properties();
hibernateProperties.setProperty("hibernate.dialect", map.get("db.dialect"));
hibernateProperties.setProperty("hibernate.jdbc.batch_size", "0");
localSessionFactoryBean.setHibernateProperties(hibernateProperties);
localSessionFactoryBean.setDataSource(dataSource);
return localSessionFactoryBean;
}
@Bean
public HibernateTransactionManager transactionManager(SessionFactory sessionFactory){
return new HibernateTransactionManager(sessionFactory);
}
}
其他一些相关的事情
在bean安装过程中不要捕获
Exception，让配置崩溃，否则您的应用程序处于某种奇怪的状态。您正在将
DataSource注入到LocalSessionFactoryBean中，这使得显式属性设置无用。close的DataSource方法会自动检测到。您不需要所有这些
@Qualifier批注尝试在
@Bean方法的返回类型中尽可能具体，这是应用适当的回调所必需的。不要自己打电话给
afterPropertiesSet Spring将为您做到这一点。关于java - BeanInstantiationException由于java.lang.NullPointerException，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/44589882/