JMeter - JDBC Driver issue

I was trying JDBC query execution through JMeter. I was getting the error like java.sql.SQLException: No suitable driver found . I have given ojdbc6.jar on classpath and installed Oracle client. Still JMeter has thrown error. The solution is, ojdbc6.jar should be copied under JMeter Lib folder (<JMeter installation directory>\lib).

Later, the same script was copied into a server and executed the script. Got the same error. Server does not have Oracle client installation and ojdbc6.jar in JMeter lib folder. Just copied the ojdbc6.jar and able to run the script successfully.
Note:
ojdbc6.jar should be used for Oracle 11 version. Also it is supported only Java1.5 and above.

JMeter Tip - javascript eval

For my jmeter script, I was trying to set a javascript statement for this formula --> pitia=${cpi}+${cti}+(${eshortage}/60)
I used the code like this --> ${__javaScript( eval ('${cpi}'.concat('+'\,'${cti}'\,'+'\,'${eshortage}'\,' /60' ) ) )}
The above one was working in a simple script and it is not worked in my business script.

In jmeter.log, I got the exception like below:
2011/07/07 17:30:30 ERROR - jmeter.functions.JavaScript: Error processing Javascript org.mozilla.javascript.EcmaError: SyntaxError: missing ; before statement (<cmd>#1(eval)#1)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3229)
at org.mozilla.javascript.DefaultErrorReporter.error(DefaultErrorReporter.java:78)
at org.mozilla.javascript.Parser.addError(Parser.java:126)
at org.mozilla.javascript.Parser.reportError(Parser.java:132)
at org.mozilla.javascript.Parser.statementHelper(Parser.java:1175)
at org.mozilla.javascript.Parser.statement(Parser.java:623)
at org.mozilla.javascript.Parser.parse(Parser.java:355)
at org.mozilla.javascript.Parser.parse(Parser.java:293)

The reason for failure is a simple space, which was given for variable 'cpi'. The jmeter error did not indicate the right reason. You should debug each variable.