Make sure the thread joins before we save the stdout

Author: doxiao

new-integration-tests/src/test/java/oracle/weblogic/kubernetes/ItMiiDomain.java

@@ -519,21 +519,21 @@ public void testAddSecondApp() {
       // do nothing
     }
 
-    // check and wait for the original app to be ready
+    // check and wait for the new app to be ready
     checkAppRunning(
         domainUID,
         domainNamespace,
         "8001",
-        "sample-war/index.jsp",
-        APP_RESPONSE_V2);
-    
-    // check and wait for the new app to be ready
+        "sample-war-3/index.jsp",
+        APP_RESPONSE_V3);
+
+    // check and wait for the original app to be ready
     checkAppRunning(
         domainUID,
         domainNamespace,
         "8001",
-        "sample-war-3/index.jsp",
-        APP_RESPONSE_V3);
+        "sample-war/index.jsp",
+        APP_RESPONSE_V2);
 
     logger.info("The cluster has been rolling started, and the two applications are both running correctly.");
   }

new-integration-tests/src/test/java/oracle/weblogic/kubernetes/utils/ExecCommand.java

@@ -84,7 +84,12 @@ public static ExecResult exec(
       }
 
       p.waitFor();
- 
+      
+      if (out != null) {
+        out.join();
+        out = null;
+      }
+    
       return new ExecResult(p.exitValue(), read(in.getInputStream()), read(p.getErrorStream()));
 
     } finally {