getting a nullpointer with hibernateTemplate

[LORDs_diakonos]

I am not sure what is going on. I am getting a null pointer on a hibernateTemplate.

I am using Hibernate 3, ACEGI and Spring WebMVC. I am also tring to get declaritive transactions working.

I will paste my config files below. I have a controller that adds an object to the database, that works. Then I call an appPemission() which uses a ultilty class called AbstractHibernateSpringDAO which extends the HibernateDaoSupport. The AbstractHibernateSpringDAO tried to save its permission object to the database its hibernateTemplate is null.

public class AppDAOHibernate extends AbstractHibernateSpringDAO implements AppDAO {

  private BasicAclExtendedDao basicAclExtendedDao;
.....
edu.bju.shared.model.security.dao.AppDAO#save(edu.bju.shared.model.security.App)
   */
  public void save(App app) {
    super.saveOrUpdate(app);

  }
public void addPermission(long parentObject, SimpleAclEntry acl, int permissionMask, String recipient) {
  super.addPermission(App.class.getName(), parentObject, acl, permissionMask, recipient);
}
....
}

public abstract class AbstractHibernateSpringDAO extends HibernateDaoSupport implements GenericDAO{

public AbstractHibernateSpringDAO(){}

public void saveOrUpdate(Object obj){
  getHibernateTemplate().saveOrUpdate(obj);
}
public void delete(Object obj){
  getHibernateTemplate().delete(obj);
}
public Object find(Class clazz, Long id){
  return getHibernateTemplate().load(clazz, id);
}
public List findAll(Class clazz){
  return getHibernateTemplate().find("from " + clazz.getName());
}
public void addPermission(String className, long parentObject, SimpleAclEntry acl, int permissionMask, String recipient){
  AclObjectIdentity aclObject = new AclObjectIdentity();
  aclObject.setAclClass(acl.getClass().getName());
  aclObject.setParentObject(parentObject);
  aclObject.setObjectIdentity(className);
  AclObjectIdentityDAOHibernate aclObjectDao = new AclObjectIdentityDAOHibernate();
  aclObjectDao.save(aclObject);
  
  AclPermission aclPer = new AclPermission();
  aclPer.setAclObjectIdentity(aclObject);
  aclPer.setMask(new Integer(permissionMask));
  aclPer.setRecipient(recipient);
  AclPermissionDAOHibernate aclPerDAO = new AclPermissionDAOHibernate();
  aclPerDAO.save(aclPer);

}
public void deletePermission(){
  
}
/* (non-Javadoc)
 * @see edu.bju.aem.util.GenericDAO#startOperation()
 */
public void startOperation() {
  // TODO Auto-generated method stub

}
}

	   
	<bean id="factory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="mappingResources">
			<list>
				<value>edu/bju/aem/model/Service.hbm.xml</value>
				<value>edu/bju/aem/model/OS.hbm.xml</value>
				<value>edu/bju/aem/model/mapping/Server.hbm.xml</value>
				<value>edu/bju/aem/model/Database.hbm.xml</value>
				<value>edu/bju/shared/model/people/mapping/PersonWareHouse.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/App.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AppRole.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AppRights.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AclObjectIdentity.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AclPermission.hbm.xml</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.DB2Dialect</prop>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="format_sql">true</prop>
			</props>
		</property>
		<property name="dataSource">
			<ref bean="dataSource" />
		</property>

	</bean>
 
  <bean id="txProxyTemplate" abstract="true"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        <property name="transactionManager"><ref bean="transactionManager"/></property>
        <property name="transactionAttributes">
            <props>
                <prop key="save*">PROPAGATION_REQUIRED</prop>
                <prop key="remove*">PROPAGATION_REQUIRED</prop>
                <prop key="load*">PROPAGATION_REQUIRED</prop>
                <prop key="update*">PROPAGATION_REQUIRED</prop>
                <prop key="delete*">PROPAGATION_REQUIRED</prop>
                <prop key="add*">PROPAGATION_REQUIRED</prop>
                <prop key="find*">PROPAGATION_REQUIRED</prop>
            </props>
        </property>
    </bean>
    
        <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory"><ref bean="factory"/></property>
    </bean>

<bean id="appDAOHibernateManaged" parent="txProxyTemplate">
        <property name="target">
            <bean class="edu.bju.shared.model.security.dao.AppDAOHibernate">
                <property name="sessionFactory"><ref bean="factory"/></property>
            </bean>
        </property>
        <property name="preInterceptors">
            <list>
                <ref bean="securityInterceptor"/>
            </list>
        </property>
    </bean>

stacktrace

10:53:49,265 INFO  [STDOUT] Hibernate: insert into AEM.APPS (APPNAME, DESCRIPTION, ENTITYPACKAGE, ID) values (?, ?, ?, ?)
10:54:24,953 ERROR [DispatcherServlet] Could not complete request
java.lang.NullPointerException
	at edu.bju.shared.util.spring.AbstractHibernateSpringDAO.saveOrUpdate(AbstractHibernateSpringDAO.java:32)
	at edu.bju.shared.model.security.dao.AclObjectIdentityDAOHibernate.save(AclObjectIdentityDAOHibernate.java:40)
	at edu.bju.shared.util.spring.AbstractHibernateSpringDAO.addPermission(AbstractHibernateSpringDAO.java:49)
	at edu.bju.shared.model.security.dao.AppDAOHibernate.addPermission(AppDAOHibernate.java:56)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:335)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
	at net.sf.acegisecurity.intercept.method.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:80)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
	at $Proxy54.addPermission(Unknown Source)
	at 
....
10:54:24,953 ERROR [[aemApp]] Servlet.service() for servlet aemApp threw exception

[LORDs_diakonos]

OK I fixed the null pointer problem. In the AbstractHibernateSpringDAO I was constructing 2 other DAOs. I changed the code get them from beans in Spring and now no null pointer.

But my transaction is not actually commiting. What am I doing wrong

	   
	<bean id="factory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="mappingResources">
			<list>
				<value>edu/bju/aem/model/Service.hbm.xml</value>
				<value>edu/bju/aem/model/OS.hbm.xml</value>
				<value>edu/bju/aem/model/mapping/Server.hbm.xml</value>
				<value>edu/bju/aem/model/Database.hbm.xml</value>
				<value>edu/bju/shared/model/people/mapping/PersonWareHouse.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/App.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AppRole.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AppRights.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AclObjectIdentity.hbm.xml</value>
				<value>edu/bju/shared/model/security/mapping/AclPermission.hbm.xml</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.DB2Dialect</prop>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="format_sql">true</prop>
			</props>
		</property>
		<property name="dataSource">
			<ref bean="dataSource" />
		</property>

	</bean>
 
  <bean id="txProxyTemplate" abstract="true"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        <property name="transactionManager"><ref bean="transactionManager"/></property>
        <property name="transactionAttributes">
            <props>
                <prop key="save*">PROPAGATION_REQUIRED</prop>
                <prop key="remove*">PROPAGATION_REQUIRED</prop>
                <prop key="load*">PROPAGATION_REQUIRED</prop>
                <prop key="update*">PROPAGATION_REQUIRED</prop>
                <prop key="delete*">PROPAGATION_REQUIRED</prop>
                <prop key="add*">PROPAGATION_REQUIRED</prop>
                <prop key="find*">PROPAGATION_REQUIRED</prop>
            </props>
        </property>
    </bean>
    
        <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory"><ref bean="factory"/></property>
    </bean>

<bean id="appDAOHibernateManaged" parent="txProxyTemplate">
        <property name="target">
            <bean class="edu.bju.shared.model.security.dao.AppDAOHibernate">
                <property name="sessionFactory"><ref bean="factory"/></property>
            </bean>
        </property>
        <property name="preInterceptors">
            <list>
                <ref bean="securityInterceptor"/>
            </list>
        </property>
    </bean>

updated AbstractHibernateSpringDAO code

public abstract class AbstractHibernateSpringDAO extends HibernateDaoSupport implements GenericDAO{

public AbstractHibernateSpringDAO(){}

public void saveOrUpdate(Object obj){
  getHibernateTemplate().saveOrUpdate(obj);
}
public void delete(Object obj){
  getHibernateTemplate().delete(obj);
}
public Object find(Class clazz, Long id){
  return getHibernateTemplate().load(clazz, id);
}
public List findAll(Class clazz){
  return getHibernateTemplate().find("from " + clazz.getName());
}
public void addPermission(String className, long parentObject, SimpleAclEntry acl, int permissionMask, String recipient){
  AclObjectIdentity aclObject = new AclObjectIdentity();
  aclObject.setAclClass(acl.getClass().getName());
  aclObject.setParentObject(parentObject);
  aclObject.setObjectIdentity(className);
  ApplicationContext ctx = new ClassPathXmlApplicationContext("WEB-INF/*-context.xml");
  AclObjectIdentityDAOHibernate aclObjectDao = (AclObjectIdentityDAOHibernate)ctx.getBean("AclObjectIdentityDAOHibernate");
 // AclObjectIdentityDAOHibernate aclObjectDao = new AclObjectIdentityDAOHibernate();
  aclObjectDao.save(aclObject);
  
  AclPermission aclPer = new AclPermission();
  aclPer.setAclObjectIdentity(aclObject);
  aclPer.setMask(new Integer(permissionMask));
  aclPer.setRecipient(recipient);
  AclPermissionDAOHibernate aclPerDAO = (AclPermissionDAOHibernate)ctx.getBean("AclPermissionDAOHibernate");
  //AclPermissionDAOHibernate aclPerDAO = new AclPermissionDAOHibernate();
  aclPerDAO.save(aclPer);

}
public void deletePermission(){
  
}
/* (non-Javadoc)
 * @see edu.bju.aem.util.GenericDAO#startOperation()
 */
public void startOperation() {
  // TODO Auto-generated method stub

}

}

[LORDs_diakonos]

ok well sadly I didn't get any help :-( but I did figure out what was happening. It was trying to update and not insert. I had to use the save and not saveOrUpdate method of the hibernateTemplate. Also I had a problem in a hibernate mapping file which had the id generator set to assigned and I had to make it native.