Problem in SpringLdap 1.3.0 Authentication

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JavaSE

JavaSE6

I have a problem with getContext(userDN,password) method when I pass the valid userDn and password also it shows some error like the implementation is not supported.
I have used the context.xml like this:

<bean id="contextSource" class="org.springframework.ldap.pool.factory.Pooli ngContextSource">
  <property name="contextSource" ref="contextSourceTarget" />
</bean>

<bean id="contextSourceTarget" class="org.springframework.ldap.core.support.LdapC ontextSource">
  <property name="url" value="url" />
  <property name="base" value="dc=xxx,dc=com" />
  <property name="userDn" value="uid=bind,ou=System,dc=xxx,dc=com" />
  <property name="password" value="bind" />
  <property name="pooled" value="true"></property>
</bean>

<bean id="ldapTemplate" class="org.springframework.ldap.core.LdapTemplate">
  <constructor-arg ref="contextSource" />
</bean>

<bean id="springLDAPService" class="com.service.serviceimpl" depends-on="ldapConstants">
  <property name="ldapTemplate" ref="ldapTemplate" />
  <property name="contextSource" ref="contextSource"></property>
  <property name="userValidationContextSource" ref="userValidationContextSource" /> 
</bean>

After this, the context source I am injecting in the serviceimpl class and calling the method like

ctx=contextSource.getContext(userDn, password);

When I use the contextSource of PoolingContextSource it is throwing exception
but when I use the LDAPContextSource it is executing but the problem is the
LdapUtils.closeContext(ctx); is not working means context object is not closing in this like the above one
Any help will be appreciated. Please help, it is very urgent.