http://www.jboss.org/jboss-servlet-api_3.1_spec: The Java Servlet 3.1 API classes (JBoss by Red Hat) 
public interface javax.servlet.Filter
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.servlet.Filter
  super_class: java.lang.Object
{
  public abstract void init(javax.servlet.FilterConfig);
    descriptor: (Ljavax/servlet/FilterConfig;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws javax.servlet.ServletException
    MethodParameters:
              Name  Flags
      filterConfig  

  public abstract void doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain);
    descriptor: (Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/FilterChain;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException, javax.servlet.ServletException
    MethodParameters:
          Name  Flags
      request   
      response  
      chain     

  public abstract void destroy();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "Filter.java"