From d835df56b98591f5b365e0509b3cf57bd03fcd38 Mon Sep 17 00:00:00 2001
From: Sayontan Chowdhury <sayon@tigerit.com>
Date: Wed, 26 Aug 2020 14:33:57 +0600
Subject: [PATCH] Update ZMsg.save() and ZMsg.dump()

These functions no longer throw NullPointerExceptions due to ZMsg objects having
ZFrames created with default ZFrame() public constructor
---
 jzmq-core/src/main/java/org/zeromq/ZMsg.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/jzmq-core/src/main/java/org/zeromq/ZMsg.java b/jzmq-core/src/main/java/org/zeromq/ZMsg.java
index 779ebdd4..6c42b43b 100644
--- a/jzmq-core/src/main/java/org/zeromq/ZMsg.java
+++ b/jzmq-core/src/main/java/org/zeromq/ZMsg.java
@@ -239,7 +239,7 @@ public static boolean save(ZMsg msg, DataOutputStream file)
                     // Write byte size of frame
                     file.writeInt(f.size());
                     // Write frame byte data
-                    file.write(f.getData());
+                    file.write(f.hasData() ? f.getData() : new byte[0]);
                 }
             }
             return true;
@@ -342,7 +342,7 @@ public void dump(Appendable out)
             PrintWriter pw = new PrintWriter(sw);
             pw.printf("--------------------------------------\n");
             for (ZFrame frame : frames) {
-                pw.printf("[%03d] %s\n", frame.getData().length, frame.toString());
+                pw.printf("[%03d] %s\n", frame.hasData() ? frame.getData().length : 0, frame.toString());
             }
             out.append(sw.getBuffer());
             sw.close();