NullPointerException while initializing org.springframework.orm.hibernate4.LocalSessionFactoryBean

[Ganesan Shankar]

hibernate-cfg.xml:
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"> <context:property-placeholder location="classpath*:config/db/database.properties"/> <!-- DataSource --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <!-- Hibernate session factory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> <prop key="hibernate.show_sql">true</prop> </props> </property> <property name="mappingResources"> <list> <value>classpath:config/db/mapping/userdetails.hbm.xml</value> </list> </property> </bean> </beans>

Error while starting tomcat:

INFO: Loaded JDBC driver: com.mysql.jdbc.Driver
May 08, 2016 10:02:02 AM org.springframework.web.context.support.XmlWebApplicationContext refresh
WARNING: Exception encountered during context initialization - 
cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'sessionFactory' defined in URL [file:/D:/workspace/project/test/.metadata/.plugins/org.eclipse.wst.server.core
/tmp0/wtpwebapps/testWeb/WEB-INF/classes/config/db/hibernate-cfg.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException
May 08, 2016 10:02:02 AM org.springframework.web.context.ContextLoader initWebApplicationContext
SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in URL
 [file:/D:/workspace/project/test/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/testWeb/
WEB-INF/classes/config/db/hibernate-cfg.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:753)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.getResources(ClassLoaderServiceImpl.java:173)
	at java.util.ServiceLoader$LazyIterator.hasNext(Unknown Source)
	at java.util.ServiceLoader$1.hasNext(Unknown Source)
	at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.loadJavaServices(ClassLoaderServiceImpl.java:340)
	at org.hibernate.integrator.internal.IntegratorServiceImpl.<init>(IntegratorServiceImpl.java:40)
	at org.hibernate.boot.registry.BootstrapServiceRegistryBuilder.build(BootstrapServiceRegistryBuilder.java:213)
	at org.hibernate.cfg.Configuration.<init>(Configuration.java:119)
	at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.<init>(LocalSessionFactoryBuilder.java:140)
	at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:343)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
	... 22 more

 

Please help to solve the issue.

Thanks in advance.

[Karthik Shiraly]

If you are specifying mapping resources using <mappingResources> tag, don't prefix with "classpath:".
Items in <mappingResources> are passed as they are to Hibernate without Spring pre-processing the "classpath:" prefixes, and Hibernate doesn't understand what to do with the "classpath:" prefixes. Hence your error.

A better option is to use <mappingLocations> instead of <mappingResources>, because you can specify "classpath:" in them. It's a subtle difference.

PS: Welcome to CodeRanch ! Please change your username to a real name as per our naming policy http://www.javaranch.com/name.jsp.

[Ganesan Shankar]

Thank you Karthik for your quick rely.
Below are the approaches I tried, but getting the same error in all the attempts

Approach 1: <property name="mappingResources"> <list> <value>config/db/mapping/userdetails.hbm.xml</value> </list> </property> Approach 2: <property name="mappingResources"> <list> <value>/config/db/mapping/userdetails.hbm.xml</value> </list> </property Approach 3: <property name="mappingLocations"> <list> <value>classpath:config/db/mapping/userdetails.hbm.xml</value> </list> </property>


Source Structure:
Java Resources
--src
----config.db
--------database.properties
--------hibernate-cfg.xml
----config.db.mapping
--------userdetails.hbm.xml
WebContent

userdetails.hbm.xml:
=============
<?xml version="1.0"?> <hibernate-mapping> <class name="com.test.dao.entity.Product" table="product"> <id name="productId" type="java.lang.Long"> <column name="id" /> <generator class="identity" /> </id> <property name="productCode" type="string"> <column name="code" length="20" not-null="true" /> </property> <property name="productDesc" type="string"> <column name="desc" not-null="true" /> </property> </class> </hibernate-mapping>

Product.java:
========

package com.test.dao.entity;

public class Product {
	public Long getProductId() {
		return productId;
	}
	public void setProductId(Long productId) {
		this.productId = productId;
	}
	public String getProductCode() {
		return productCode;
	}
	public void setProductCode(String productCode) {
		this.productCode = productCode;
	}
	public String getProductDesc() {
		return productDesc;
	}
	public void setProductDesc(String productDesc) {
		this.productDesc = productDesc;
	}
	private Long productId;
	private String productCode;
	private String productDesc;
}

[Karthik Shiraly]

Check the filenames. Resources say "userdetails.hbm.xml" but the file structure says it's "userdetails.xml".

[Ganesan Shankar]

I have corrected the typo error in my previous post (it is userdetails.hbm.xml)

[Karthik Shiraly]

I tried to reproduce your problem in a Eclipse dynamic web project - copy pasted all your configuration files, created matching package structure, added Spring 4.1 and hibernate 5.1.0 libs.
It's all working fine for me. I don't think there is anything wrong with your configuration files now.

Googling some parts of the exception traces leads to this discussion where somebody has got the same exception as you.
Apparently, one possible cause is if Hibernate and/or Spring are added to the Eclipse build path as a "User library" with "System library" checkbox checked.
Have you added them as a "User Library" or something? In my case, I just copied all the JARs into WebContent/lib and refreshed the project. Maybe you can remove any User Libraries you have added and try this approach.

[Ganesan Shankar]

Thank you. It works after moving all the jars to WEB-INF/lib.