Add generated serialVersionUID to Serializable classes that don't have

one.

Signed-off-by: Mark Thomas <markt@apache.org>

src/main/java/javax/servlet/GenericFilter.java

@@ -47,6 +47,8 @@
 public abstract class GenericFilter 
     implements Filter, FilterConfig, java.io.Serializable
 {
+    private static final long serialVersionUID = 4060116231031076581L;
+
     private static final String LSTRING_FILE = "javax.servlet.LocalStrings";
     private static final ResourceBundle lStrings =
         ResourceBundle.getBundle(LSTRING_FILE);

src/main/java/javax/servlet/GenericServlet.java

@@ -50,6 +50,8 @@
 public abstract class GenericServlet 
     implements Servlet, ServletConfig, java.io.Serializable
 {
+    private static final long serialVersionUID = -8592279577370996712L;
+
     private static final String LSTRING_FILE = "javax.servlet.LocalStrings";
     private static ResourceBundle lStrings =
         ResourceBundle.getBundle(LSTRING_FILE);

src/main/java/javax/servlet/ServletException.java

@@ -28,6 +28,8 @@
 
 public class ServletException extends Exception {
 
+    private static final long serialVersionUID = 4221302886851315160L;
+
     private Throwable rootCause;
 
 

src/main/java/javax/servlet/UnavailableException.java

@@ -50,6 +50,8 @@
 public class UnavailableException
 extends ServletException {
 
+    private static final long serialVersionUID = 5622686609215003468L;
+
     private Servlet     servlet;           // what's unavailable
     private boolean     permanent;         // needs admin action?
     private int         seconds;           // unavailability estimate

src/main/java/javax/servlet/http/HttpFilter.java

@@ -50,6 +50,8 @@
 public abstract class HttpFilter extends GenericFilter
 {
 
+    private static final long serialVersionUID = 7478463438252262094L;
+
     /**
      * <p>Does nothing, because this is an abstract class.</p>
      * 

src/main/java/javax/servlet/http/HttpServlet.java

@@ -73,6 +73,8 @@
 
 public abstract class HttpServlet extends GenericServlet
 {
+    private static final long serialVersionUID = 8466325577512134784L;
+
     private static final String METHOD_DELETE = "DELETE";
     private static final String METHOD_HEAD = "HEAD";
     private static final String METHOD_GET = "GET";