Error creating bean with name 'sqlSessionFactory' ... Invocation of init method failed; nested exception is java.lang.NullPointerException - spring

Question

I'm trying to integrate spring-mybatis in my application. I'm using spring 4.1.4 and mybatis 3.2.8 java 7 and the server is WebSphere Application Server Liberty. I'm using a spring java configuration class. This error is showing only when I'm deploying the war file, if I'm using Eclipse to deploy the project everything is ok. Deploying in Tomcat 8 is working too.
#Configuration
#MapperScan("x.y.z.mappers")
#PropertySource("classpath:/x/y/z/data_source.properties")
#EnableTransactionManagement
public class DataAccessConfiguration {
#Autowired
private Environment env;
#Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(env.getProperty("driver"));
dataSource.setUrl(env.getProperty("url"));
dataSource.setUsername(env.getProperty("user"));
dataSource.setPassword(env.getProperty("password"));
return dataSource;
}
#Bean
public DataSourceTransactionManager transactionManager() {
return new DataSourceTransactionManager(dataSource());
}
#Bean
public SqlSessionFactoryBean sqlSessionFactory() throws Exception {
SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setTypeAliasesPackage("x.y.z.portal.model");
return sessionFactory;
}
}
I got this stacktrace
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in a.b.c.DataAccessConfiguration: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1566)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1127)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1051)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:949)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1280)
... 60 more
Caused by: java.lang.NullPointerException
at java.io.FilterInputStream.read(FilterInputStream.java:133)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:154)
at java.io.BufferedReader.readLine(BufferedReader.java:317)
at java.io.BufferedReader.readLine(BufferedReader.java:382)
at org.apache.ibatis.io.DefaultVFS.list(DefaultVFS.java:93)
at org.apache.ibatis.io.VFS.list(VFS.java:193)
at org.apache.ibatis.io.ResolverUtil.find(ResolverUtil.java:216)
at org.apache.ibatis.type.TypeAliasRegistry.registerAliases(TypeAliasRegistry.java:127)
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:399)
at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:355)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1625)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1562)

Answer 1

Instead try this to integrate your application with mybatis. Add below code to spring-dispatcher-servlet.xml.
<context:property-placeholder location="x/y/z/data_source.properties"/>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName"><value>${database.driver}</value></property>
<property name="url"><value>${database.url}</value></property>
<property name="username"><value>${database.username}</value></property>
<property name="password"><value>${database.password}</value></property>
<property name="maxActive"><value>${database.maxactiveconnections}</value></property>
<property name="maxIdle"><value>${database.idleconnections}</value></property>
<property name="initialSize"><value>${database.initialSize}</value></property>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="/WEB-INF/mybatis-config.xml"/>
</bean>
<bean id="Dao" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
<property name="mapperInterface" value="com.dao.Dao" />
</bean>