i am getting the following error on my application startup page load : 

```
 SEVERE: Error Rendering View[/HomeTemplate/equityVolume.xhtml]
javax.el.ELException: /HomeTemplate/equityVolume.xhtml @70,78 value="#{equityBean.scripList}": java.lang.IllegalStateException: PWC3999: Cannot create a session after the response has been committed...

    Caused by: java.lang.IllegalStateException: PWC3999: Cannot create a session after the response has been committed...

```

i get this error when i apply the css to my homepage, the error disappears when i remove the css template(but i want to aplly the css template)
following is the bean code snippet that causes the error(found by debugging)

```
public List<MasterScrip> getScripList() {
   HttpServletRequest req=(HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest(); //error line
   HttpSession session=req.getSession();
   type=(String)session.getAttribute("type");...

```

xhtml code:

```
<h:body>
    <ui:composition template="commonClientLayout.xhtml">

    <ui:define name="contentFile">
            <div id="content">
    <h:form id="frm">...

```

when i remove the ui:composition and define tags(i.e. if i dont apply the css), then i dont get this error.
what could be causing this error and how do i solve it?

**edited:**

```
    @PostConstruct
void initialiseSession() {
    if(type!=null)
      {
       if(type.equalsIgnoreCase("losers"))
       {
        scripList=new ArrayList<MasterScrip> ();
        scripList=getScripByPriceLosers(exchange);
       // return scripList;
       }
       else if(type.equalsIgnoreCase("gainers"))
       {
        scripList=new ArrayList<MasterScrip> ();
     scripList=getScripByPriceGainers(exchange);
       // return scripList;
       }
       else
       {
           scripList=new ArrayList<MasterScrip> ();
     scripList=getScripByVolumeType(exchange);
     //  return scripList;
       }
      }
      else
      {
          scripList=new ArrayList<MasterScrip> ();
     scripList=getScripByVolumeType(exchange);
      }

}

    public List<MasterScrip> getScripList() {
       return scripList;

    }

```

**edited again:** 

```
 SEVERE: Error Rendering View[/equityVolume.xhtml]
java.lang.IllegalStateException
    at org.apache.catalina.connector.ResponseFacade.setBufferSize(ResponseFacade.java:275)...

```

***edit: web.xml***

```
    <?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Production</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.FACELETS_BUFFER_SIZE</param-name>
        <param-value>65535</param-value>
    </context-param>

    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>

    </session-config>
    <welcome-file-list>
        <welcome-file>equityVolume.xhtml</welcome-file>
    </welcome-file-list>
    <security-constraint>
        <display-name>Constraint1</display-name>
        <web-resource-collection>
            <web-resource-name>AdminTemplate</web-resource-name>
            <description/>
            <url-pattern>/AdminTemplate/*</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <description/>
            <role-name>admin</role-name>
        </auth-constraint>
    </security-constraint>
    <security-constraint>
        <display-name>Constraint2</display-name>
        <web-resource-collection>
            <web-resource-name>ClientTemplate</web-resource-name>
            <description/>
            <url-pattern>/ClientTemplate/*</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <description/>
            <role-name>client</role-name>
        </auth-constraint>
    </security-constraint>
    <login-config>
        <auth-method>FORM</auth-method>
        <realm-name>DataRealm</realm-name>
        <form-login-config>
            <form-login-page>/equityVolume.xhtml</form-login-page>
            <form-error-page>/errorpage.xhtml</form-error-page>
        </form-login-config>
    </login-config>
    <security-role>
        <description/>
        <role-name>admin</role-name>
    </security-role>
    <security-role>
        <description/>
        <role-name>client</role-name>
    </security-role>
</web-app>

```