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package jp.co.insightech;
 
import java.io.IOException;
 
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
 
 
public class CharacterEncodingFilter implements Filter {
 
        private static final String INIT_PARAMETER_ENCODING = "encoding";
 
        private static final String DEFAULT_ENCODING = "MS932";
 
        private String encoding;
 
        public void init(FilterConfig config) throws ServletException {
                this.encoding = config.getInitParameter(INIT_PARAMETER_ENCODING);
                if (this.encoding == null) {
                          this.encoding = DEFAULT_ENCODING;
                }
        }
 
        public void destroy() {
               this.encoding = null;
        }
 
         /**
         * リクエストのエンコーディングがセットされていない場合、
         * 初期化パラメータ encoding で指定されたエンコーディングを
         * リクエストにセットします。
         * 
         * @param servletRequest
         *            ServletRequest
	 * @param servletResponse
         *            ServletResponse
         * @param chain
         *            FilterChain
         * @throws IOException
         * @throws ServletException
         */
        public void doFilter(ServletRequest servletRequest,
                        ServletResponse servletResponse, FilterChain chain)
                        throws IOException, ServletException {
 
                if (servletRequest.getCharacterEncoding() == null) {
                        servletRequest.setCharacterEncoding(encoding);
                }
                chain.doFilter(servletRequest, servletResponse);
        }
}

Main.java:13: error: class CharacterEncodingFilter is public, should be declared in a file named CharacterEncodingFilter.java
public class CharacterEncodingFilter implements Filter {
       ^
Main.java:5: error: package javax.servlet does not exist
import javax.servlet.Filter;
                    ^
Main.java:6: error: package javax.servlet does not exist
import javax.servlet.FilterChain;
                    ^
Main.java:7: error: package javax.servlet does not exist
import javax.servlet.FilterConfig;
                    ^
Main.java:8: error: package javax.servlet does not exist
import javax.servlet.ServletException;
                    ^
Main.java:9: error: package javax.servlet does not exist
import javax.servlet.ServletRequest;
                    ^
Main.java:10: error: package javax.servlet does not exist
import javax.servlet.ServletResponse;
                    ^
Main.java:13: error: cannot find symbol
public class CharacterEncodingFilter implements Filter {
                                                ^
  symbol: class Filter
Main.java:21: error: cannot find symbol
        public void init(FilterConfig config) throws ServletException {
                         ^
  symbol:   class FilterConfig
  location: class CharacterEncodingFilter
Main.java:21: error: cannot find symbol
        public void init(FilterConfig config) throws ServletException {
                                                     ^
  symbol:   class ServletException
  location: class CharacterEncodingFilter
Main.java:46: error: cannot find symbol
        public void doFilter(ServletRequest servletRequest,
                             ^
  symbol:   class ServletRequest
  location: class CharacterEncodingFilter
Main.java:47: error: cannot find symbol
                        ServletResponse servletResponse, FilterChain chain)
                        ^
  symbol:   class ServletResponse
  location: class CharacterEncodingFilter
Main.java:47: error: cannot find symbol
                        ServletResponse servletResponse, FilterChain chain)
                                                         ^
  symbol:   class FilterChain
  location: class CharacterEncodingFilter
Main.java:48: error: cannot find symbol
                        throws IOException, ServletException {
                                            ^
  symbol:   class ServletException
  location: class CharacterEncodingFilter
14 errors

Standard output is empty