Getting Class Cast exception with custom impersonation in websphere 8.5 -

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i writing custom impersonation in websphere 8.5. getting class cast exception at:

context ctx = new initialcontext(); portletservicehome pshimpersonate = (portletservicehome)    ctx.lookup(impersonationservice.jndi_name);

the error is: java.lang.classcastexception: com.ibm.wps.services.portletserviceregistry.home.portletservicehomeimpl incompatible com.ibm.portal.portlet.service.portletservicehome

please suggest how fix error. checked online not getting proper help.


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