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Spring injection issue while using iBatis DAO Object in two classes

prince davies
Ranch Hand

Joined: May 08, 2009
Posts: 74
Injecting SqlMapClient to one webservice implementation pojo(A) class and a normal pojo(A) classes using SPRING.

When I do only for class A,I am able to get ADao object instantiated and able to get connected todatabase and get database transaction done and returning values.

But when I do(injecting) for two classes A ,B .It gets instantiated ,but it does not return any value.It throws NullPointerException at m_aDao.saveAndReturnId(); Where I am using object of ADao to run sql queries to get some values using SqlMapClient of iBatis.

Class A is Webservice implementation classs(pojo) as given below.

Class A{
private ADao m_aDao;
public void createAssessmentRequest(String userId, Holder<AssessmentRequest> assessmentRequest){
B b = new B();
public ADao getADao() {return m_aDao;}
public void setADao(ADao aDao) {m_aDao = aDao;}

Class B is service helper classs(pojo)

Class B{
private ADao m_aDao;
public void assembleAndSave{
public ADao getADao() {return m_aDao;}
public void setADao(ADao aDao) {m_aDao = aDao;}

public class ADaoSqlmap extends AbstractSqlMapDao implements ADao{
public long saveAndReturnId() {
Long Id =-1L;
Map AMap = new HashMap();
AMap .put( "createuserId", userId );
AMap .put( "lstUpdtduserId", userId );
Id = (Long) insert( STAT_ID_INSERT_AND_GET_ID,AMap );
return Id.longValue() ;


<bean id="JndiSettings" class="org.springframework.jndi.JndiTemplate">
<property name="environment">
<prop key="java.naming.factory.initial">weblogic.jndi.WL InitialContextFactory</prop>

<bean id="dataSource" class="org.springframework.aop.framework.ProxyFact oryBean">
<property name="proxyInterfaces"><value>javax.sql.DataSource </value></property>
<property name="targetSource">
<bean class="org.springframework.jndi.JndiObjectTargetSo urce">
<property name="jndiName"><value>${connections/dataSources/mgmtSource/jndiName}</value></property>
<property name="jndiTemplate" ref="JndiSettings"/>
<property name="lookupOnStartup" value="false"/>

<bean id="aSqlMap" class="org.springframework.orm.ibatis.SqlMapClient FactoryBean">
<property name="configLocation">
<property name="dataSource"><ref local="dataSource"/></property>

<bean id="ADaoImpl" class="" >
<property name="sqlMapClient"><ref local="aSqlMap"/></property>

<bean id="txManager" class="org.springframework.transaction.jta.WebLogi cJtaTransactionManager" />

<bean id="service" lazy-init="true" class="org.springframework.transaction.interceptor .TransactionProxyFactoryBean">
<property name="transactionManager"><ref local="txManager"/></property>
<property name="target"><ref local="aTx"/></property>
<property name="transactionAttributes">
<prop key="*">PROPAGATION_REQUIRES_NEW,-Exception</prop>

<!--Ends adding transaction manager -->
<bean id="aTx" lazy-init="true" class="A">
property name="aDao">
<ref local="ADaoImpl"/>

<bean id="b" lazy-init="true" class="B">
<ref local="ADaoImpl"/>

Why it is throwing NullPointerException at m_aDao.saveAndReturnId?

Is there any problems in injecting in spring file? is there any problem in using same object for both A and B classes?

Please help me to resolve this issue.


How do I have access to same DAO Object in two classes and at the same I should be able to instantiate one class in another class and should not throw NullPointerException when accessing a method in that DAO Object.This DAO Object is implemented using iBatis.
Christophe Verré

Joined: Nov 24, 2005
Posts: 14687

You must have made a mistake by copy/pasting your code :

Where is the property opening tag ?

And please UseCodeTags.

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