TelnetInputStream.read() doesn't preserve the original

InterruptedException as the cause of its InterruptedIOException.

Author: garydgregory

src/changes/changes.xml

@@ -70,6 +70,7 @@ The <action> type attribute can be add,update,fix,remove.
       <action type="fix" dev="ggregory" due-to="Gary Gregory">IOUtil.readWrite() now restores the current thread's interrupt flag when catching InterruptedException.</action>
       <action type="fix" dev="ggregory" due-to="Gary Gregory">TelnetInputStream now restores the current thread's interrupt flag when catching InterruptedException.</action>
       <action type="fix" dev="ggregory" due-to="Jianwei Guo, Gary Gregory" issue="NET-740">FTP fails to parse listings for Linux vsftpd in Chinese or Japanese #393.</action>
+      <action type="fix" dev="ggregory" due-to="Gary Gregory">TelnetInputStream.read() doesn't preserve the original InterruptedException as the cause of its InterruptedIOException.</action>
       <!-- ADD -->
       <action type="add" dev="ggregory" due-to="Gary Gregory">Add DatagramSocketClient.getDefaultTimeoutDuration() and deprecate getDefaultTimeout().</action> 
       <!-- UPDATE -->

src/main/java/org/apache/commons/net/telnet/TelnetInputStream.java

@@ -199,7 +199,9 @@ public int read() throws IOException {
                             readIsWaiting = false;
                         } catch (final InterruptedException e) {
                             Thread.currentThread().interrupt();
-                            throw new InterruptedIOException("Fatal thread interruption during read.");
+                            final InterruptedIOException interruptedIoException = new InterruptedIOException("Fatal thread interruption during read.");
+                            interruptedIoException.initCause(e);
+                            throw interruptedIoException;
                         }
                     } else {
                         // alreadyread = false;