Small exception improvements

lib/src/main/java/com/auth0/jwt/JWTVerifier.java

@@ -343,7 +343,7 @@ private boolean assertValidInstantClaim(String claimName, Claim claim, long leew
             if (shouldBeFuture) {
                 isValid = assertInstantIsFuture(claimVal, leeway, now);
                 if (!isValid) {
-                    throw new TokenExpiredException(String.format("The Token has expired on %s.", claimVal), claimVal);
+                    throw new TokenExpiredException(String.format("The Token has expired on %s.", claimVal), claim);
                 }
             } else {
                 isValid = assertInstantIsLessThanOrEqualToNow(claimVal, leeway, now);

lib/src/main/java/com/auth0/jwt/exceptions/IncorrectClaimException.java

@@ -6,7 +6,6 @@
  * This exception is thrown when the expected value is not found while verifying the Claims.
  */
 public class IncorrectClaimException extends InvalidClaimException {
-    private final String claimName;
 
     private final Claim claimValue;
 
@@ -19,20 +18,10 @@ public class IncorrectClaimException extends InvalidClaimException {
      * @param claim The Claim value for which verification failed
      */
     public IncorrectClaimException(String message, String claimName, Claim claim) {
-        super(message);
-        this.claimName = claimName;
+        super(message, claimName);
         this.claimValue = claim;
     }
 
-    /**
-     * This method can be used to fetch the name for which the Claim verification failed.
-     *
-     * @return The claim name for which the verification failed.
-     */
-    public String getClaimName() {
-        return claimName;
-    }
-
     /**
      * This method can be used to fetch the value for which the Claim verification failed.
      *

lib/src/main/java/com/auth0/jwt/exceptions/InvalidClaimException.java

@@ -4,7 +4,21 @@
  * The exception that will be thrown while verifying Claims of a JWT.
  */
 public class InvalidClaimException extends JWTVerificationException {
-    public InvalidClaimException(String message) {
+
+    private final String claimName;
+
+    public InvalidClaimException(String message, String claimName) {
         super(message);
+        this.claimName = claimName;
     }
+
+    /**
+     * This method can be used to fetch the name for which the Claim verification failed.
+     *
+     * @return The claim name for which the verification failed.
+     */
+    public String getClaimName() {
+        return claimName;
+    }
+
 }

lib/src/main/java/com/auth0/jwt/exceptions/MissingClaimException.java

@@ -5,19 +5,8 @@
  */
 public class MissingClaimException extends InvalidClaimException {
 
-    private final String claimName;
-
     public MissingClaimException(String claimName) {
-        super(String.format("The Claim '%s' is not present in the JWT.", claimName));
-        this.claimName = claimName;
+        super(String.format("The Claim '%s' is not present in the JWT.", claimName), claimName);
     }
 
-    /**
-     * This method can be used to fetch the name for which the Claim is missing during the verification.
-     *
-     * @return The name of the Claim that doesn't exist.
-     */
-    public String getClaimName() {
-        return claimName;
-    }
 }

lib/src/main/java/com/auth0/jwt/exceptions/TokenExpiredException.java

@@ -1,19 +1,22 @@
 package com.auth0.jwt.exceptions;
 
+import com.auth0.jwt.RegisteredClaims;
+import com.auth0.jwt.interfaces.Claim;
+
 import java.time.Instant;
 
 /**
  * The exception that is thrown if the token is expired.
  */
-public class TokenExpiredException extends JWTVerificationException {
+public class TokenExpiredException extends IncorrectClaimException {
 
     private static final long serialVersionUID = -7076928975713577708L;
 
     private final Instant expiredOn;
 
-    public TokenExpiredException(String message, Instant expiredOn) {
-        super(message);
-        this.expiredOn = expiredOn;
+    public TokenExpiredException(String message, Claim claim) {
+        super(message, RegisteredClaims.EXPIRES_AT, claim);
+        this.expiredOn = claim.asInstant();
     }
 
     public Instant getExpiredOn() {