diff options
Diffstat (limited to 'website')
| -rw-r--r-- | website/features/Synchronized.html | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/website/features/Synchronized.html b/website/features/Synchronized.html index 643b0cd3..e3059655 100644 --- a/website/features/Synchronized.html +++ b/website/features/Synchronized.html @@ -23,8 +23,8 @@ named <code>$LOCK</code> instead. </p><p> If you want, you can create these locks yourself. The <code>$lock</code> and <code>$LOCK</code> fields will of course not be generated if you - already created them yourself. You can also choose to lock on another field, by using specifying it as parameter to the <code>@Synchronized</code> - annotation. In this usage variant, the fields will not be created automatically, and you must explicitly create them yourself. + already created them yourself. You can also choose to lock on another field, by specifying it as parameter to the <code>@Synchronized</code> + annotation. In this usage variant, the fields will not be created automatically, and you must explicitly create them yourself, or an error will be emitted. </p><p> Locking on <code>this</code> or your own class object can have unfortunate side-effects, as other code not under your control can lock on these objects as well, which can cause race conditions and other nasty threading-related bugs. @@ -48,6 +48,9 @@ If <code>$lock</code> and/or <code>$LOCK</code> are auto-generated, the fields are initialized with an empty <code>Object[]</code> array, and not just a <code>new Object()</code> as most snippets showing this pattern in action use. Lombok does this because a new object is <em>NOT</em> serializable, but 0-size array is. Therefore, using <code>@Synchronized</code> will not prevent your object from being serialized. + </p><p> + If you'd like to know why a field is not automatically generated when you choose your own name for the lock object: Because otherwise making a typo + in the field name will result in a <em>very</em> hard to find bug! </p> </div> </div> |