Merge branch 'master' into develop

# Conflicts:
#	pom.xml

src/main/java/org/cryptomator/cryptofs/ch/CleartextFileChannel.java

@@ -208,11 +208,7 @@ public void force(boolean metaData) throws IOException {
 	}
 
 	private void forceInternal(boolean metaData) throws IOException {
-		if (isWritable()) {
-			writeHeaderIfNeeded();
-			chunkCache.invalidateAll(); // TODO performance: write chunks but keep them cached
-			exceptionsDuringWrite.throwIfPresent();
-		}
+		flush();
 		ciphertextFileChannel.force(metaData);
 		if (metaData) {
 			FileTime lastModifiedTime = isWritable() ? FileTime.from(lastModified.get()) : null;
@@ -221,6 +217,18 @@ private void forceInternal(boolean metaData) throws IOException {
 		}
 	}
 
+	/**
+	 * Writes in-memory contents to the ciphertext file
+	 * @throws IOException
+	 */
+	private void flush() throws IOException {
+		if (isWritable()) {
+			writeHeaderIfNeeded();
+			chunkCache.invalidateAll(); // TODO performance: write chunks but keep them cached
+			exceptionsDuringWrite.throwIfPresent();
+		}
+	}
+
 	@Override
 	public MappedByteBuffer map(MapMode mode, long position, long size) {
 		throw new UnsupportedOperationException();
@@ -285,7 +293,7 @@ long beginOfChunk(long cleartextPos) {
 	@Override
 	protected void implCloseChannel() throws IOException {
 		try {
-			forceInternal(true);
+			flush();
 		} finally {
 			super.implCloseChannel();
 			closeListener.closed(this);

src/main/java/org/cryptomator/cryptofs/fh/ExceptionsDuringWrite.java

@@ -14,20 +14,19 @@
 @OpenFileScoped
 public class ExceptionsDuringWrite {
 
-	private final List<IOException> exceptions = new ArrayList<>();
+	private final IOException e = new IOException("Exceptions occured while writing");
 
 	@Inject
 	public ExceptionsDuringWrite() {
 	}
 
 	public synchronized void add(IOException e) {
-		exceptions.add(e);
+		e.addSuppressed(e);
 	}
 
 	public synchronized void throwIfPresent() throws IOException {
-		if (!exceptions.isEmpty()) {
-			IOException e = new IOException("Exceptions occured while writing");
-			exceptions.forEach(e::addSuppressed);
+		if (e.getSuppressed().length > 0) {
+			e.fillInStackTrace();
 			throw e;
 		}
 	}