Update Javadoc links from Java 6 to 8

Author: garydgregory

src/main/java/org/apache/commons/codec/Charsets.java

@@ -22,7 +22,7 @@
 /**
  * Charsets required of every implementation of the Java platform.
  *
- * From the Java documentation <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard
+ * From the Java documentation <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard
  * charsets</a>:
  * <p>
  * <cite>Every implementation of the Java platform is required to support the following character encodings. Consult the
@@ -53,7 +53,7 @@
  * This class is immutable and thread-safe.
  * </p>
  *
- * @see <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+ * @see <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
  * @since 1.7
  */
 public class Charsets {
@@ -69,7 +69,7 @@ public class Charsets {
      * Every implementation of the Java platform is required to support this character encoding.
      * </p>
      *
-     * @see <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     * @see <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
      * @deprecated Use {@link java.nio.charset.StandardCharsets#ISO_8859_1} instead.
      */
     @Deprecated
@@ -81,7 +81,7 @@ public class Charsets {
      * Every implementation of the Java platform is required to support this character encoding.
      * </p>
      *
-     * @see <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     * @see <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
      * @deprecated Use {@link java.nio.charset.StandardCharsets#US_ASCII} instead.
      */
     @Deprecated
@@ -94,7 +94,7 @@ public class Charsets {
      * Every implementation of the Java platform is required to support this character encoding.
      * </p>
      *
-     * @see <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     * @see <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
      * @deprecated Use {@link java.nio.charset.StandardCharsets#UTF_16} instead.
      */
     @Deprecated
@@ -106,7 +106,7 @@ public class Charsets {
      * Every implementation of the Java platform is required to support this character encoding.
      * </p>
      *
-     * @see <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     * @see <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
      * @deprecated Use {@link java.nio.charset.StandardCharsets#UTF_16BE} instead.
      */
     @Deprecated
@@ -118,7 +118,7 @@ public class Charsets {
      * Every implementation of the Java platform is required to support this character encoding.
      * </p>
      *
-     * @see <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     * @see <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
      * @deprecated Use {@link java.nio.charset.StandardCharsets#UTF_16LE} instead.
      */
     @Deprecated
@@ -130,7 +130,7 @@ public class Charsets {
      * Every implementation of the Java platform is required to support this character encoding.
      * </p>
      *
-     * @see <a href="https://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     * @see <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
      * @deprecated Use {@link java.nio.charset.StandardCharsets#UTF_8} instead.
      */
     @Deprecated

src/main/java/org/apache/commons/codec/digest/DigestUtils.java

@@ -143,7 +143,7 @@ public static byte[] digest(final MessageDigest messageDigest, final RandomAcces
      * Gets a {@code MessageDigest} for the given {@code algorithm}.
      *
      * @param algorithm the name of the algorithm requested. See
-     *                  <a href="https://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA">Appendix A in the Java
+     *                  <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA">Appendix A in the Java
      *                  Cryptography Architecture Reference Guide</a> for information about standard algorithm names.
      * @return A digest instance.
      * @see MessageDigest#getInstance(String)
@@ -161,7 +161,7 @@ public static MessageDigest getDigest(final String algorithm) {
      * Gets a {@code MessageDigest} for the given {@code algorithm} or a default if there is a problem getting the algorithm.
      *
      * @param algorithm            the name of the algorithm requested. See
-     *                             <a href="https://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA"> Appendix A in the Java
+     *                             <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA"> Appendix A in the Java
      *                             Cryptography Architecture Reference Guide</a> for information about standard algorithm names.
      * @param defaultMessageDigest The default MessageDigest.
      * @return A digest instance.
@@ -204,7 +204,7 @@ public static MessageDigest getMd5Digest() {
      * Gets a {@code MessageDigest} for the given {@code algorithm}.
      *
      * @param algorithm the name of the algorithm requested. See
-     *                  <a href="https://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA"> Appendix A in the Java
+     *                  <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA"> Appendix A in the Java
      *                  Cryptography Architecture Reference Guide</a> for information about standard algorithm names.
      * @return A digest instance.
      * @see MessageDigest#getInstance(String)

src/main/java/org/apache/commons/codec/digest/HmacUtils.java

@@ -154,7 +154,7 @@ public static Mac getHmacSha512(final byte[] key) {
      * Returns an initialized {@code Mac} for the given {@code algorithm}.
      *
      * @param algorithm the name of the algorithm requested. See
-     *                  <a href= "https://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA" >Appendix A in the Java
+     *                  <a href= "https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA" >Appendix A in the Java
      *                  Cryptography Architecture Reference Guide</a> for information about standard algorithm names.
      * @param key       The key for the keyed digest (must not be null).
      * @return A Mac instance initialized with the given key.
@@ -170,7 +170,7 @@ public static Mac getInitializedMac(final HmacAlgorithms algorithm, final byte[]
      * Returns an initialized {@code Mac} for the given {@code algorithm}.
      *
      * @param algorithm the name of the algorithm requested. See
-     *                  <a href= "https://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA" >Appendix A in the Java
+     *                  <a href= "https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA" >Appendix A in the Java
      *                  Cryptography Architecture Reference Guide</a> for information about standard algorithm names.
      * @param key       The key for the keyed digest (must not be null).
      * @return A Mac instance initialized with the given key.

src/main/javadoc/overview.html

@@ -104,13 +104,13 @@ <h1><img src="org/apache/commons/codec/doc-files/leaf.svg" style="height: 1em; p
       </tr>
       <tr>
         <td><a href="org/apache/commons/codec/digest/DigestUtils.html">DigestUtils</a></td>
-        <td>Simplifies common <a href="https://docs.oracle.com/javase/6/docs/api/java/security/MessageDigest.html">MessageDigest</a> tasks and provides GNU
+        <td>Simplifies common <a href="https://docs.oracle.com/javase/8/docs/api/java/security/MessageDigest.html">MessageDigest</a> tasks and provides GNU
           libc crypt(3) compatible password hashing functions.
         </td>
       </tr>
       <tr>
         <td><a href="org/apache/commons/codec/digest/HmacUtils.html">HmacUtils</a></td>
-        <td>Simplifies common <a href="https://docs.oracle.com/javase/6/docs/api/javax/crypto/Mac.html">Mac</a> tasks. <strong>Note:</strong> Not all JCE
+        <td>Simplifies common <a href="https://docs.oracle.com/javase/8/docs/api/javax/crypto/Mac.html">Mac</a> tasks. <strong>Note:</strong> Not all JCE
           implementations support all algorithms. If not supported, an IllegalArgumentException is thrown.
         </td>
       </tr>