java - How to get ActionForm in Struts2? -

i migrating struts 1 app struts2 , trying minimize code changes required. need know how access actionform in struts2 action class. below current code , getting npe when trying access actionform.

public class deptbuildingnewaction extends actionsupport  implements servletrequestaware, servletresponseaware,  modeldriven<deptbuidingformbean> {  private httpservletrequest request; private httpservletresponse response; private deptbuidingformbean form;  public void setservletrequest(httpservletrequest httpservletrequest) {     this.request = httpservletrequest; }  public void setservletresponse(httpservletresponse httpservletresponse) {     log.debug("inside setservletresponse");     this.response = httpservletresponse; }  public deptbuidingformbean getmodel() {     log.debug("inside getform");     return form; }  public void setmodel(deptbuidingformbean form) {     log.debug("inside setform");     this.form = form; } 

what best way actionform on here ? thank time.

the form (model in struts2) should initialized prevent npe.

private deptbuidingformbean form = new deptbuidingformbean(); 

the modeldriven action allows access model on view layer , in action directly value stack, i.e. without model or form prefix. modeldriven interceptor should on interceptors stack of action. default stack contains interceptor.

from docs:

note: modeldriveninterceptor push model stack when model not null, else ignored.

in action class have field can use inside.