Transaction Deadlock Detection exception is not wrapped by the timeout exception

[Denis Magda]

Andrey Gura, Igniters,

If to refer to our documentation [1], this is how we need to catch the deadlock 
detection exception:

catch (CacheException e) {
    if (e.getCause() instanceof IgniteCheckedException &&
        e.getCause().getCause() instanceof TransactionDeadlockException)    
        
        System.out.println(e.getCause().getCause().getMessage());
}

However, this is no longer works in Ignite 2.0 because IgniteCheckedException 
has to be used instead of TransactionTimeoutException:

catch (CacheException e) {
    if (e.getCause() instanceof IgniteCheckedException &&
        e.getCause().getCause() instanceof TransactionDeadlockException)    
        
        System.out.println(e.getCause().getCause().getMessage());
}

See the example with the workaround:
https://github.com/dmagda/ignite_transactions/blob/master/src/main/java/org/apache/ignite/examples/DeadlockDetectionExample.java


Could we do on of the following:

1) Recover the previous behavior or
2) Throw TransactionDeadlockDetection right away as it’s done in .NET [3]

[1] https://apacheignite.readme.io/docs/transactions#section-deadlock-detection
[3] 
https://github.com/apache/ignite/blob/master/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Datagrid/TransactionDeadlockDetectionExample.cs#L110