NullPointerException while setting response object encoding.

Question

I am getting Null Pointer Exception at line "esponse.setCharacterEncoding(encoding);", here the encoding value i am getting is "UTF-8". The same code works fine in other webservers like websphere/tomcat. Please let me know is there any specific setting or i need to set the encoding in different way in weblogic. Weblogic 10.3.1.0 - 64 bit.
protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true;
* Take this filter out of service.
public void destroy() {
this.encoding = null;
this.filterConfig = null;
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// Conditionally select and set the character encoding to be used
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null){
request.setCharacterEncoding(encoding);
response.setContentType("text/html");
     if( encoding != null)
          response.setCharacterEncoding(encoding); //Error at this line
     else
          response.setCharacterEncoding("UTF-8");
     System.out.println("response content after :"+response.getContentType());
// Pass control on to the next filter
chain.doFilter(request, response);
* Place this filter into service.
* @throws ServletException
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true"))
this.ignore = true;
else if (value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false;
* Select an appropriate character encoding to be used, based on the characteristics of the current request and/or filter initialization
* parameters. If no character encoding should be set, return null.
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}

Answer 1

I am getting Null Pointer Exception at line "esponse.setCharacterEncoding(encoding);", here the encoding value i am getting is "UTF-8". The same code works fine in other webservers like websphere/tomcat. Please let me know is there any specific setting or i need to set the encoding in different way in weblogic. Weblogic 10.3.1.0 - 64 bit.
protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true;
* Take this filter out of service.
public void destroy() {
this.encoding = null;
this.filterConfig = null;
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// Conditionally select and set the character encoding to be used
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null){
request.setCharacterEncoding(encoding);
response.setContentType("text/html");
     if( encoding != null)
          response.setCharacterEncoding(encoding); //Error at this line
     else
          response.setCharacterEncoding("UTF-8");
     System.out.println("response content after :"+response.getContentType());
// Pass control on to the next filter
chain.doFilter(request, response);
* Place this filter into service.
* @throws ServletException
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true"))
this.ignore = true;
else if (value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false;
* Select an appropriate character encoding to be used, based on the characteristics of the current request and/or filter initialization
* parameters. If no character encoding should be set, return null.
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}