Override mechanism for modules.properties works backwards
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                 Key: DERBY-4815
                 URL: https://issues.apache.org/jira/browse/DERBY-4815
             Project: Derby
          Issue Type: Bug
          Components: Services
    Affects Versions: 10.6.1.0
            Reporter: Knut Anders Hatlen
            Assignee: Knut Anders Hatlen


It is possible to override the properties in 
org/apache/derby/modules.properties by putting your own version of it somewhere 
on the classpath. BaseMonitor.getDefaultModuleProperties() apparently intends 
to use values from the first modules.properties file that mentions a property:

                            String key = (String) newKeys.nextElement();
                            if( moduleList.contains( key))
                                // RESOLVE how do we localize messages before 
we have finished initialization?
                                report( "Ignored duplicate property " + key + " 
in " + modulesPropertiesURL.toString());
                            else
                                moduleList.setProperty( key, 
otherList.getProperty( key));

However, moduleList.contains(key) doesn't look for a key in moduleList, it 
looks for a property value. This code should have used containsKey() instead.

Beacuse of this, the last modules.properties on the classpath will take 
precedence over the ones earlier on the classpath. So if you for example have 
two different versions of derby.jar in the classpath, the engine will use the 
classes from the first jar and modules.properties from the last jar.

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