better to throw an exception if aborted by timeout
removed unused import class and fix typos in javadoc
Merge branch 'master' of github.com:zkoss/zk
Use ActivationTimeoutException instead
Use SC_ACTIVATION_TIMEOUT instead of 500
javadoc
revert 1551
Merge remote-tracking branch 'zkoss/master' into zkoss-master
1048-clear-validation-message
Merge commit '1048-clear-validation-message' into master
Merge commit 'zkoss-master' into binding-tracker