checkShutdownSignal sets connection and channel to null. The referenced bug has been FIXED, so DTRT.

Simon MacMullen · Simon MacMullen · commit dc87b420a53a · 2010-08-11T11:45:45.000+01:00
diff --git a/test/src/com/rabbitmq/client/test/server/Permissions.java b/test/src/com/rabbitmq/client/test/server/Permissions.java
@@ -375,9 +375,8 @@ protected void runTest(boolean exp, String name, WithName test)
             assertTrue(msg, exp);
         } catch (IOException e) {
             checkShutdownSignal(AMQP.ACCESS_REFUSED, e);
-            //This fails due to bug 20296
-            //openChannel();
-            channel = connection.createChannel(channel.getChannelNumber() + 1);
+            openConnection();
+            openChannel();
         }
     }
 

Original file line number	Diff line number	Diff line change
`@@ -375,9 +375,8 @@ protected void runTest(boolean exp, String name, WithName test)`
`375`	`375`	`assertTrue(msg, exp);`
`376`	`376`	`} catch (IOException e) {`
`377`	`377`	`checkShutdownSignal(AMQP.ACCESS_REFUSED, e);`
`378`		`- //This fails due to bug 20296`
`379`		`- //openChannel();`
`380`		`- channel = connection.createChannel(channel.getChannelNumber() + 1);`
	`378`	`+ openConnection();`
	`379`	`+ openChannel();`
`381`	`380`	`}`
`382`	`381`	`}`
`383`	`382`