From 0a1eaa8600d0223282bb1d507cfec76aeed8c352 Mon Sep 17 00:00:00 2001
From: Markus Kreusch <mail@markuskreusch.de>
Date: Sun, 17 Jan 2016 19:01:54 +0100
Subject: [PATCH] Fixed exception when closing channel that was opened with
 exception

---
 .../filesystem/nio/SharedFileChannel.java      | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/main/filesystem-nio/src/main/java/org/cryptomator/filesystem/nio/SharedFileChannel.java b/main/filesystem-nio/src/main/java/org/cryptomator/filesystem/nio/SharedFileChannel.java
index 304fcc746..17516f146 100644
--- a/main/filesystem-nio/src/main/java/org/cryptomator/filesystem/nio/SharedFileChannel.java
+++ b/main/filesystem-nio/src/main/java/org/cryptomator/filesystem/nio/SharedFileChannel.java
@@ -40,11 +40,19 @@ class SharedFileChannel {
 	public void open(OpenMode mode) {
 		doLocked(() -> {
 			Thread thread = Thread.currentThread();
-			if (openedBy.put(thread, thread) != null) {
-				throw new IllegalStateException("SharedFileChannel already open for current thread");
-			}
-			if (delegate == null) {
-				createChannel(mode);
+			boolean failed = true;
+			try {
+				if (openedBy.put(thread, thread) != null) {
+					throw new IllegalStateException("SharedFileChannel already open for current thread");
+				}
+				if (delegate == null) {
+					createChannel(mode);
+				}
+				failed = false;
+			} finally {
+				if (failed) {
+					openedBy.remove(thread);
+				}
 			}
 		});
 	}