The default character encoding settings for response are not enabled in the following cases:

• When the static contents extension is not the extension specified in the webserver.static_content.encoding.extension parameter^#1
• When the default character encoding for response is not set up for the static contents of the error page defined in the Servlet specifications^#2

#1 Parameter for specifying the static contents extension that applies the default character encoding.

#2 In the case of static contents output after one of the following conditions, the default character encoding settings for response are enabled:

• When the character encoding is not set for response and when the java.io.PrintWriter object is acquired by the getWriter method of the javax.servlet.ServletResponse interface in the servlet, JSP, or filter.
• When the request object is wrapped even though the setAttribute method is executed and the request object is wrapped with the request wrapper that does not invoke the setAttribute method.

Note that when the HTTP response compression filter is used, the default character encoding settings for response are not enabled.

When the character encoding is not specified in the Servlet specifications, the default character encoding specified for each J2EE server or Web application is applied to the following Servlet API methods:

• getCharacterEncoding method of javax.servlet.ServletRequest (for request)
• getCharacterEncoding method of javax.servlet.ServletResponse (for response)

However, when the character encoding is changed using the setCharacterEncoding method, the same character encoding will be acquired.

For the response, when the reset method of javax.servlet.ServletResponse is used to initialize the response data, the character encoding set in Application Server can be acquired with the getCharacterEncoding method.

For details on the character encoding setting method defined in the Servlet specifications, see 2.6.5 Implementation of default character encoding (For Servlet specifications).

When the Web container automatically generates an XML declaration in the JSP document and XML tag file, the default character encoding applied to the response body encoding is output in the character encoding declaration in the XML declaration.

The character encoding settings for JSP files is applied during the compilation of the JSP file. Therefore, if the character encoding settings are added or changed when the JSP file is already compiled, the added or changed character encoding will not be applied to the JSP file. To apply the settings, re-compile the JSP file.

For the Web applications that executed JSP pre-compilation with version 07-00, when you set up the default character encoding for response, re-execute the JSP pre-compilation functionality.

The followings are the description for each of the units to set up the default character encoding:

• In the case of settings for each J2EE server
  Execute JSP pre-compilation for the JSP files of all the Web applications running on the J2EE server.
  
• In the case of settings for each Web application
  Execute JSP pre-compilation for the JSP files included in the Web applications.
  

For details on the default character encoding settings during the JSP pre-compilation, see 2.6.3 Application of character encoding during JSP pre-compilation.

The character encoding for default error pages is specified in UTF-8, and therefore the default encoding is not applied.