Update URLs and remove broken links (#574)
* update URLs and remove broken links
* link to volatile
diff --git a/src/main/java/org/apache/commons/io/DirectoryWalker.java b/src/main/java/org/apache/commons/io/DirectoryWalker.java
index 55dfe90..6995ccf 100644
--- a/src/main/java/org/apache/commons/io/DirectoryWalker.java
+++ b/src/main/java/org/apache/commons/io/DirectoryWalker.java
@@ -186,11 +186,11 @@
*
* <p>
* This example provides a public {@code cancel()} method that can be called by another thread to stop the
- * processing. A typical example use-case would be a cancel button on a GUI. Calling this method sets a
- * <a href="https://java.sun.com/docs/books/jls/second_edition/html/classes.doc.html#36930"> volatile</a> flag to ensure
- * it will work properly in a multi-threaded environment. The flag is returned by the {@code handleIsCancelled()}
- * method, which will cause the walk to stop immediately. The {@code handleCancelled()} method will be the next,
- * and last, callback method received once cancellation has occurred.
+ * processing. A typical example use-case is a cancel button on a GUI. Calling this method sets a
+ * <a href='https://docs.oracle.com/javase/specs/jls/se8/html/jls-8.html#d5e12277'>(@code volatile}</a>
+ * flag to ensure it works properly in a multi-threaded environment.
+ * The flag is returned by the {@code handleIsCancelled()} method, which causes the walk to stop
+ * immediately. The {@code handleCancelled()} method will be the next, and last, callback method received once cancellation has occurred.
* </p>
*
* <pre>
diff --git a/src/main/java/org/apache/commons/io/FileSystemUtils.java b/src/main/java/org/apache/commons/io/FileSystemUtils.java
index 91c2008..1284285 100644
--- a/src/main/java/org/apache/commons/io/FileSystemUtils.java
+++ b/src/main/java/org/apache/commons/io/FileSystemUtils.java
@@ -473,11 +473,10 @@
//
// This method does what it can to avoid the 'Too many open files' error
// based on trial and error and these links:
- // https://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4784692
- // https://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4801027
- // https://forum.java.sun.com/thread.jspa?threadID=533029&messageID=2572018
- // however, it's still not perfect as the JDK support is so poor
- // (see commons-exec or Ant for a better multithreaded multi-OS solution)
+ // https://bugs.java.com/bugdatabase/view_bug.do?bug_id=4784692
+ // https://bugs.java.com/bugdatabase/view_bug.do?bug_id=4801027
+ // However, it's still not perfect as the JDK support is so poor.
+ // (See commons-exec or Ant for a better multithreaded multi-OS solution.)
//
final Process proc = openProcess(cmdAttribs);
final Thread monitor = ThreadMonitor.start(timeout);
diff --git a/src/main/java/org/apache/commons/io/IOUtils.java b/src/main/java/org/apache/commons/io/IOUtils.java
index f242725..e12a1b9 100644
--- a/src/main/java/org/apache/commons/io/IOUtils.java
+++ b/src/main/java/org/apache/commons/io/IOUtils.java
@@ -1164,7 +1164,7 @@
* </p>
* <p>
* Character encoding names can be found at
- * <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
+ * <a href="https://www.iana.org/assignments/character-sets">IANA</a>.
* </p>
* <p>
* This method uses {@link InputStreamReader}.
