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http://issues.apache.org/bugzilla/show_bug.cgi?id=33695

           Summary: Logger error with multiple Velocity engines
           Product: Velocity
           Version: 1.4
          Platform: PC
        OS/Version: Windows 2000
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Source
        AssignedTo: [email protected]
        ReportedBy: [EMAIL PROTECTED]


If you instance and init multiple engines, under some circumstances that are not
yet clear, there is an error on the log4j logger.

For example the following code:

public static void main(String[] args) throws Exception
{
       VelocityEngine[] engines = new VelocityEngine[4];
        
        for (int i = 0; i < engines.length; i++)
        {
            VelocityEngine engine = new VelocityEngine();
            engine.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH,
"C:\\temp");
            engine.init();
        }
}

will generate 141 lines of the following error:

log4j:ERROR Attempted to append to closed appender named [null].

Debugging Velocity source code we noticed that all the engines add an appender
to the same shared logger and sometime a null appender is added.
We are currently using Velocity 1.4 and Log4J 1.2.9.

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