testing - In jmeter: getting Error invoking bsh method: eval

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BeanShellInterpreter: Error invoking bsh method: eval Sourced file: inline evaluation of: import org.apache.jmeter.services.FileServer; String path=FileServer.getFileSer . . . '' : Attempt to access property on undefined variable or class name 2022-01-27 19:50:51,923 WARN o.a.j.e.BeanShellPostProcessor: Problem in BeanShell script: org.apache.jorphan.util.JMeterException: Error invoking bsh method: eval Sourced file: inline evaluation of: import org.apache.jmeter.services.FileServer; String path=FileServer.getFileSer . . . '' : Attempt to access property on undefined variable or class name

JMETER BEANSHELL CODE: (Beanshell post processor) import org.apache.jmeter.services.FileServer; String path=FileServer.getFileServer().getBaseDir();

var1= vars.get("userid");      
var2= vars.get("username");
var3= vars.get("userfullname");
var4= ${exam_id};
f = new FileOutputStream("C://apache-jmeter-5.4.1/apache-jmeter-5.4.1/bin/Script4.csv",true);
p = new PrintStream(f);
this.interpreter.setOut(p);
p.println(var1+ "," +var2 + "," +var3 + "," +var4);
f.close();
Since JMeter 3.1 it's recommended to use JSR223 Test Elements and Groovy language for scripting so it worth considering migrating to Groovy.
If you run this code with more than 1 thread (virtual user) you will face a race condition resulting in data corruption when multiple threads will be writing into the same file. JMeter provides sample_variables property allowing to write variables values to the .jtl results file, if you need to store the data in a separate file - go for Flexible File Writer
                I have used 70 thread count, but only 69 are written into the file, and 2 exceptions are received. So, I think this "var4= vars.get("exam_id");" will not help out.
– Everest
                Jan 28, 2022 at 8:38
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