DO NOT REPLY [Bug 27171] New: - Error in JDBCSampler

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=27171

Error in JDBCSampler

           Summary: Error in JDBCSampler
           Product: JMeter
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Main
        AssignedTo: jmeter-dev@jakarta.apache.org
        ReportedBy: david@carr.name


My first indication of the problem was getting unusual entries in my log files, 
even though the tests were still functioning fine.

2004/02/17 14:20:27 INFO  - jmeter.engine.StandardJMeterEngine: Running the 
test! 
2004/02/17 14:20:28 ERROR - jmeter.protocol.jdbc.util.DBConnectionManager: 
Error registering database driver '' java.lang.ClassNotFoundException: 
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:140)
 at org.apache.jmeter.protocol.jdbc.util.DBConnectionManager.registerDriver
(DBConnectionManager.java:222)
 at org.apache.jmeter.protocol.jdbc.util.DBConnectionManager.getKey
(DBConnectionManager.java:101)
 at org.apache.jmeter.protocol.jdbc.sampler.JDBCSampler.getKey
(JDBCSampler.java:173)
 at org.apache.jmeter.protocol.jdbc.sampler.JDBCSampler.testStarted
(JDBCSampler.java:282)
 at org.apache.jmeter.engine.StandardJMeterEngine.notifyTestListenersOfStart
(StandardJMeterEngine.java:149)
 at org.apache.jmeter.engine.StandardJMeterEngine.run
(StandardJMeterEngine.java:268)
 at java.lang.Thread.run(Thread.java:536)

I had a JDBC Config element which specified the driver as ${DBDriver}, a 
variable specified in the TestPlan.  The problem seems to be with the changes 
introduced to JDBCSampler.testStarted in Revision 1.23, which calls getKey.  I 
believe that Test Listeners get their testStarted method called prior to 
variable resolution, and thus, the database driver property is incorrectly set 
at that point, generating the error in the log.  When the sampler actually 
needs to execute, it has the proper information and the calls to getKey succeed.

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