Thursday, March 27, 2014

Installing R on Mac OS X

1) Install Homebrew in your system.

2) Download and install XQuartz (Homebrew does not package XQuartz and it is needed for step 3. Therefore install XQuartz.)

3) Install Fortran and R.
heshans@15mbp-08077:/tmp$ brew update

heshans@15mbp-08077:/tmp$ brew tap homebrew/science

heshans@15mbp-08077:/tmp$ brew install gfortran r 

4) Verify the installation by running R.
heshans@15mbp-08077:/tmp$ R

R version 3.0.3 (2014-03-06) -- "Warm Puppy"
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin13.1.0 (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

Tuesday, March 25, 2014

Custom Log Formatter

Following is the source for a custom log formatter.

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.LogRecord;

public class CustomFormatter extends Formatter {

    private static final DateFormat df = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss.SSS");

    public String format(LogRecord record) {
        StringBuilder builder = new StringBuilder(1000);
        builder.append(df.format(new Date(record.getMillis()))).append(" - ");
        builder.append(record.getSourceMethodName()).append("] - ");
        builder.append("").append(record.getLevel()).append(" - ");
        return builder.toString();

    public String getHead(Handler h) {
        return super.getHead(h);

    public String getTail(Handler h) {
        return super.getTail(h);

Following is the way how the log messages will turn up in your log file.

25/03/2014 08:46:17.770 - [] - INFO - thread05 compositekey set time : 5 ms
25/03/2014 08:46:17.781 - [] - INFO - thread03 compositekey set time : 11 ms
25/03/2014 08:46:17.783 - [] - INFO - thread05 compositekey set time : 12 ms
25/03/2014 08:46:17.785 - [] - INFO - thread03 compositekey set time : 4 ms
25/03/2014 08:46:17.787 - [] - INFO - thread05 compositekey set time : 4 ms

Monday, March 10, 2014

Fixing BSFException: unable to load language: java

I was using JMeter to execute BeanShell scripts that I have written and came across this exception. I had to waste sometime to find out what was the exact issue. Although I copied the BSF jar to the JMeter lib directory, it was not sufficient. When I added the bsh-bsf-2.0b4.jar, the script started running successfully. 

I thought someone else might find this tip useful, therefore blogging it.

Thursday, March 6, 2014

Fixing java.lang.ClassNotFoundException:

When using JMeter’s Java request sampler, I started seeing the below error.
2014/03/06 09:46:39 ERROR - org.apache.bsf.BSFManager: Exception : java.lang.ClassNotFoundException:
 at Method)
 at java.lang.ClassLoader.loadClass(
 at java.lang.ClassLoader.loadClass(
 at org.apache.bsf.BSFManager.loadScriptingEngine(
 at org.apache.jmeter.util.BSFTestElement.processFileOrScript(
 at org.apache.jmeter.visualizers.BSFListener.sampleOccurred(
 at org.apache.jmeter.threads.ListenerNotifier.notifyListeners(
 at org.apache.jmeter.threads.JMeterThread.notifyListeners(
 at org.apache.jmeter.threads.JMeterThread.process_sampler(

Following steps will resolve this issue.

1. Remove existing bsf jar from the jmeter/lib directory
heshans@15mbp-08077:~/Dev/tools$ rm apache-jmeter-2.11/lib/bsf-2.4.0.jar

2. Download and extract BSF

3. Copy the following two jars to the jmeter/lib directory.
heshans@15mbp-08077:~/Dev/tools$ cp bsf4rexx/bsf-rexx-engine.jar apache-jmeter-2.11/lib/ 
heshans@15mbp-08077:~/Dev/tools$ cp bsf4rexx/bsf- apache-jmeter-2.11/lib/