Closing all streams for Process (it opens all 3 streams, regardless you use it or not) since it is not handled automatically by Java.

Jagrut Kosti · Jagrut Kosti · commit 89518a713043 · 2017-06-23T15:21:57.000+09:00
diff --git a/src/main/java/multichain/command/builders/QueryBuilderCommon.java b/src/main/java/multichain/command/builders/QueryBuilderCommon.java
@@ -163,7 +163,7 @@ protected static String execute(CommandEnum command, String... parameters) throw
 				outputGobbler.start();
 
 				pr.waitFor();
-
+				pr.getOutputStream().close();
 				if(outputGobbler.output.length() > 0)
 					return outputGobbler.output;
 
