Formatting of exception for read-only or other server error

Author: kasemir

core/pva/src/main/java/org/epics/pva/client/PutRequest.java

@@ -151,9 +151,17 @@ public void handleResponse(final ByteBuffer buffer) throws Exception
             fail(new Exception("Incomplete Put Response"));
         final int request_id = buffer.getInt();
         final byte subcmd = buffer.get();
-        PVAStatus status = PVAStatus.decode(buffer);
+        final PVAStatus status = PVAStatus.decode(buffer);
         if (! status.isSuccess())
-            fail(new Exception(channel + " Put Response for " + request + ": " + status));
+        {
+            // Server reported an error with text like "Put not permitted"
+            // for EPICS 7.0.6 QSRV.
+            // Channel access similarly provided an Exception with text
+            // "No write access rights granted."
+            // Not trying to parse the message; passing it up with added
+            // channel name and request info.
+            fail(new Exception(channel + " Write for '" + channel.getName() + "' " + request + " failed with " + status));
+        }
 
         if (subcmd == PVAHeader.CMD_SUB_INIT)
         {

core/pva/src/test/java/org/epics/pva/client/ClientDemo.java

@@ -94,12 +94,23 @@ public void testGet() throws Exception
         final PVAChannel ch2 = pva.getChannel("saw", listener);
         CompletableFuture.allOf(ch1.connect(), ch2.connect()).get(5, TimeUnit.SECONDS);
 
+        System.out.println("Connected.. Stop IOC in next 10 seconds to test disconnect");
+        TimeUnit.SECONDS.sleep(10);
+
         // Get data
-        Future<PVAStructure> data = ch1.read("");
-        System.out.println(ch1.getName() + " = " + data.get());
+        try
+        {
+            Future<PVAStructure> data = ch1.read("");
+            System.out.println(ch1.getName() + " = " + data.get());
 
-        data = ch2.read("");
-        System.out.println(ch2.getName() + " = " + data.get());
+            data = ch2.read("");
+            System.out.println(ch2.getName() + " = " + data.get());
+        }
+        catch (Exception ex)
+        {
+            System.out.println("Read failed");
+            ex.printStackTrace();
+        }
 
         // Close channels
         ch2.close();
@@ -264,7 +275,7 @@ public void testStatic() throws Exception
     }
 
     /** Write ('put') test
-     * 
+     *
      *  Includes a pause to allow manual stopping of the server.
      *
      *  May be used with read-only access security on IOC