Andy Seaborne created JENA-1237:
-----------------------------------

             Summary: TIM not isolating trasnactions at the start
                 Key: JENA-1237
                 URL: https://issues.apache.org/jira/browse/JENA-1237
             Project: Apache Jena
          Issue Type: Bug
    Affects Versions: Jena 3.1.0
            Reporter: Andy Seaborne
         Attachments: ReportTxn.java

TIM is not creating the transaction isolation when {{begin(READ)}} is called 
but on the first operation.

The attached example has two other-thread actions that differ only in whether 
the begin is followed by a dataset read action (thread 2) or not (thread 1).  
This changes the output of otherwise identical actions.

{{ThreadAction}} takes 3 parts - the first part executes before the {{create}} 
returns, the second part when {{run}} is called and exceptions captured, the 
3rd part is clearup (called during {{run}}).

Annotated output from the attached program:

{noformat}
DatasetGraphInMemory
thread 1:1 : x=<no count>
Main       : other1
thread 2:1 : x=0
Main       : other2
Main 1     : x=0
Main 2     : x=1
thread 1:2 : x=1          ** Should be zero **
thread 2:2 : x=0

TDBDataset
thread 1:1 : x=<no count>
Main       : other1
thread 2:1 : x=0
Main       : other2
Main 1     : x=0
Main 2     : x=1
thread 1:2 : x=0          ** Correctly zero **
thread 2:2 : x=0
{noformat}



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