improved the diagnostics

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@36964 71c3de6d-444a-0410-be80-ed276b4c234a

remoting/src/main/java/hudson/remoting/FastPipedInputStream.java

@@ -48,6 +48,8 @@ public class FastPipedInputStream extends InputStream {
     int writeLaps = 0;
     int writePosition = 0;
 
+    private final Throwable allocatedAt = new Throwable();
+    
     /**
      * Creates an unconnected PipedInputStream with a default buffer size.
      */
@@ -78,7 +80,7 @@ public class FastPipedInputStream extends InputStream {
 
     private FastPipedOutputStream source() throws IOException {
         FastPipedOutputStream s = source.get();
-        if (s==null)    throw new IOException("Writer side has already been abandoned");
+        if (s==null)    throw (IOException)new IOException("Writer side has already been abandoned").initCause(allocatedAt);
         return s;
     }
 

remoting/src/main/java/hudson/remoting/FastPipedOutputStream.java

@@ -46,6 +46,8 @@ public class FastPipedOutputStream extends OutputStream {
      */
     private long written=0;
 
+    private final Throwable allocatedAt = new Throwable();
+
     /**
      * Creates an unconnected PipedOutputStream.
      */
@@ -75,7 +77,7 @@ public class FastPipedOutputStream extends OutputStream {
 
     private FastPipedInputStream sink() throws IOException {
         FastPipedInputStream s = sink.get();
-        if (s==null)    throw new IOException("Reader side has already been abandoned");
+        if (s==null)    throw (IOException)new IOException("Reader side has already been abandoned").initCause(allocatedAt);
         return s;
     }