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From "Rick Hillegas (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-1428) Generating derby properties on the fly can lead to non-deterministic engine startup behavior
Date Mon, 19 Jun 2006 14:06:29 GMT
Generating derby properties on the fly can lead to non-deterministic engine startup behavior
--------------------------------------------------------------------------------------------

         Key: DERBY-1428
         URL: http://issues.apache.org/jira/browse/DERBY-1428
     Project: Derby
        Type: Bug

  Components: Store  
    Versions: 10.0.2.0, 10.0.2.1, 10.0.2.2, 10.1.1.0, 10.2.0.0, 10.1.2.1, 10.1.3.0, 10.1.2.2,
10.1.2.3, 10.3.0.0, 10.1.2.4, 10.1.2.5, 10.1.4.0, 10.1.3.1    
    Reporter: Rick Hillegas


A Heisenbug can arise if more than one embedded Derby application runs in the same VM and
at least one of them generates derby properties on the fly. Here's the problem scenario:

o The customer runs two embedded Derby apps in the same VM: EmbeddedApp and OtherApp.

o EmbeddedApp generates derby properties on the fly before connecting to a database and triggering
engine startup.

o Whether the engine picks up those generated properties depends on whether EmbeddedApp or
OtherApp runs first.

Here are two workarounds for the problem:

1) Don't generate derby properties on the fly. Instead, specify them on the VM startup command.
Or specify them in a $DERBY_HOME/derby.properties file which is generated before the VM comes
up and which does not change during the lifetime of the VM.

2) If you can't do (1), then modify the VM startup script so that it forces the applications
to run in a deterministic order.


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