Fixing checkstyle issues

bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/BufferedChannel.java

@@ -243,9 +243,9 @@ public long forceWrite(boolean forceMetadata) throws IOException {
 
     @Override
     public synchronized int read(ByteBuf dest, long pos, int length) throws IOException {
-        if(dest.writableBytes() < length) {
-            throw new IllegalArgumentException("dest buffer remaining capacity is not enough" +
-                    "(must be at least as \"length\"=" + length +")");
+        if (dest.writableBytes() < length) {
+            throw new IllegalArgumentException("dest buffer remaining capacity is not enough" 
+                    + "(must be at least as \"length\"=" + length +")");
         }
 
         long prevPos = pos;
@@ -300,4 +300,4 @@ public synchronized int getNumOfBytesInWriteBuffer() {
     long getUnpersistedBytes() {
         return unpersistedBytes.get();
     }
-}
+}