Spring GenericFilterBean @AutoWired hibernate property is null -

a simple filter implementation:

public class sessionfilter extends genericfilterbean {  @autowired private sessionfactory sessionfactory;  @override public void dofilter(servletrequest servletrequest, servletresponse servletresponse, filterchain filterchain) throws ioexception, servletexception {     system.out.println("sessionfilter : dofilter called. opening session...");     if(sessionfactory == null) {         system.out.println("its null");     }     sessionfactory.getcurrentsession().begintransaction();     system.out.println("sessionfilter : dofilter calling filter chain..");     filterchain.dofilter(servletrequest, servletresponse);     system.out.println("sessionfilter : dofilter closing session.");     sessionfactory.getcurrentsession().gettransaction().commit();     system.out.println("sessionfilter : dofilter finished."); }  public void setsessionfactory(sessionfactory sessionfactory) {     this.sessionfactory =sessionfactory; } 

}

web.xml:

 <filter>         <filter-name>sessionfilter</filter-name>         <filter-class>lt.maze.controller.sessionfilter</filter-class>     </filter>     <filter-mapping>         <filter-name>sessionfilter</filter-name>         <url-pattern>/*</url-pattern>     </filter-mapping> 

and part of application context xml file:

<beans:bean id="hibernate5annotatedsessionfactory"             class="org.springframework.orm.hibernate5.localsessionfactorybean">     <beans:property name="datasource" ref="datasource" />     <beans:property name="hibernateproperties">         <beans:props>             <beans:prop key="hibernate.dialect">org.hibernate.dialect.mysqldialect             </beans:prop>             <beans:prop key="hibernate.show_sql">true</beans:prop>         </beans:props>     </beans:property> </beans:bean>  <beans:bean id="sessionfilter" class="lt.maze.controller.sessionfilter">     <beans:property name="sessionfactory" ref="hibernate5annotatedsessionfactory" /> </beans:bean> 

for reason variable sessionfactory null, null point exception(and print prints "its null"). full message 16-aug-2015 23:51:38.383 severe [http-apr-8080-exec-2] org.apache.catalina.core.standardwrappervalve.invoke servlet.service() servlet [maze] in context path [] threw exception java.lang.nullpointerexception

edit:i added more prints sessionfilters setsessionfactory method:

public void setsessionfactory(sessionfactory sessionfactory) {     system.out.println("sesionfilter : setsessionfactory called");     if(sessionfactory == null) {         system.out.println("sessionfilter : setsessionfactory. sessionfactory null");     } else {         system.out.println("sessionfilter : setsessionfactory. sessionfactory isnt null");     }     this.sessionfactory = sessionfactory;     system.out.println("after assignment this.sessionfactory null? " + (this.sessionfactory == null)); } 

which print out

sesionfilter : setsessionfactory called sessionfilter : setsessionfactory. sessionfactory isnt null after assignment this.sessionfactory null? false 

so how can sessionfactory null afterwards if value isn't changed?

solved(i think) changing filter class in filter attribute:

    <filter>         <filter-name>sessionfilter</filter-name>         <filter-class>org.springframework.web.filter.delegatingfilterproxy</filter-class>     </filter>     <filter-mapping>         <filter-name>sessionfilter</filter-name>         <url-pattern>/*</url-pattern>     </filter-mapping>