Automated testing of Android applications in Java with Appium

Appium is an open source API which can be used for black-box testing of apps. It is built on top of Selenium WebDriver, which was covered in a previous post. Appium can be used to test native, hybrid and mobile web apps on Android or iOS. Several languages are supported, including Java. This blog will focus testing native Android applications in Java using Eclipse. Writing such tests requires you to have access to an .apk (more...)

Doing performance measurements of an OSB Proxy Service by programmatically extracting performance metrics via the ServiceDomainMBean and presenting them as an image via a PowerPoint VBA module

This article explains how the process of doing performance measurements of an OSB Proxy Service and presenting them in a “performance analysis document” was partly automated. After running a SoapUI based Test Step (sending a request to the service), extracting the service performance metrics was done by using the ServiceDomainMBean in the public API of the Oracle Service Bus. These service performance metrics can be seen in the Oracle Service Bus Console via the Service (more...)

Flame Graphs Vs. Cold Numbers

Stack trace sampling is very powerful technique for performance troubleshooting. Advantages of stack trace sampling are

  • it doesn't require upfront configuration
  • cost added by sampling is small and controllable
  • it is easy to compare analysis result from different experiments

Unfortunately, tools offered for stack trace analysis by stock profilers are very limited.

Solving performance problem in complex applications (a lot of business logic etc) is one of my regular challenges. Let's assume I have another (more...)

Beware of slightly different behaviour between ConcurrentMap and ConcurrentHashMap for computeIfAbsent

So I was refactoring some code to use non-locking collection classes and I noticed the this significant different between ConcurrentMap.computeIfAbsent and ConcurrentHashMap.computeIfAbsent. They key different is that for the former default implementing the mapping function can be called many times for a particular key where as for the concrete implementation it will be called only once.

Right okay so armed with that you know that any collection that implements just ConcurrentMap will inherit (more...)

Becky’s BI Apps Corner: Installing on Windows Server 2012

Recently I was installing Oracle BI Apps on a VM for a custom training, as mentioned in a previous post. I setup the VM with Windows Server 2012 after verifying in the certification matrix that the Oracle BI Apps version ( was certified to run on Windows Server 2012.

As I was going along, I was getting errors during some of the installs on the pre-requisite checks for the operating system (more...)

Automated regression testing in Java with Selenium IDE, Selenium WebDriver and Selenide

After an update it is often desirable to check whether existing features of an application are still working correctly. This process is called ‘regression testing’. Several tools can be used to automate this process. This blog will focus on Selenium IDE, Selenium WebDriver and Selenide which can be used for front-end/ black-box testing of browserapplications.

Selenium IDE

Selenium IDE is a Firefox plugin which can be used to record interactions with a web application. After (more...)

IT Salary Thought

During the holidays, I check salaries for my students and the IT industry overall. I’m never surprised by the reality, after all salaries pay for return on skills and effort. Here’s my annual look, which some may find unkind but reality is seldom kind.

Before looking at IT salaries, it seems like a good opportunity to first look at the overall job market for Millennials in the United States. AOL provides a great graphic of (more...)

A very simple implementation of Suite to make it easy to run across a bunch of test machines at the same time.

So I was presented with a large suite that I need to distribute amongst an arbitrary number of Hudson slaves. Now my first guess would be to hand balance this into N sub suites; but that would require on-going work and would need to change depending on the number of nodes. (We have a target of 30 minutes to run all tests in parallel which is going to take some machines)


SQL Developer 4.1.2: Missing MSVCR100.dll file

I downloaded the latest version of SQL Developer (4.1.2) to a just-provisioned, pristine server running Windows Server 2012 R2.

I downloaded, unzipped it, and placed it under c:program filessqldeveloper- I double-clicked the main sqldeveloper executable and expected it to "just work" (as it usually does), but this time it didn't.

I got the following error message:

sqldeveloper64W.exe - System Error

The (more...)

Integrating GitHub with Oracle Developer Cloud Service by Stefano La Porta

Stefano Illustrates how to integrate your existing repository in GitHub with Oracle Developer Cloud Service using you're preferred Git client or IDE that supports Git integration. Check out Stefano's entry here.

JavaScript and PeopleCode Array Parameters

I have been experimenting with scripting PeopleCode using JavaScript. This is possible because Java includes Mozilla's Rhino JavaScript engine. I took one of my experiments to OpenWorld 2015 which shows creating a Microsoft Excel Spreadsheet using POI and JavaScript. Here we are, a couple of weeks later, and I see this in the PeopleSoft OTN Discussion Forum: Java Exception: java.lang.reflect.InvocationTargetException: during call of java.lang.reflect.Method .invoke. Perfect! That is (more...)

DevOps Sessions at OOW and JavaOne

Robbrecht van Amerongen of AMIS Technology has provided a nice summary of sessions to attend at OOW and JavaOne this year. Check it out here.

Does Linux hate Java?

Recently, I have discovered a fancy bug affecting few version of Linux kernel. Without any warnings JVM just hangs in GC pause forever. Root cause is a improper memory access in kernel code. This post by Gil Tene gives a good technical explanation with deep emotional coloring.

While this bug is not JVM specific, there are few other multithreaded processes you can find on typical Linux box.

This recent bug make me remember few other (more...)

PeopleSoft Streams from Oracle University

In February of this year, Oracle University launched the PeopleSoft Learning Stream. Oracle's Learning Streams are short, educational vignettes. I was given the privilege of recording 6 streams:

  • Using JavaScript with Pagelet Wizard is a 21 minute video showing you how to use Pagelet Wizard to convert a PeopleSoft query into an interactive D3 chart, a navigation collection into a carousel, a navigation collection into an accordion, and RequireJS for JavaScript dependency management.
  • REST Query (more...)

Batch processing in JEE7 (JSR 352)

A new feature in JEE7 is Batch Processing, an implementation of JSR 352 based on the programming model of Spring Batch. With batch processing, we understand the execution of a series of jobs (steps) , sequential or in parallel, without any user interaction. In this blog, we want to give a small overview of the capabilities of this new feature.
The code of this blog can be downloaded from here.
The zip file contains an Eclipse (more...)

JavaScript on the App Server: Scripting PeopleCode

It has been nearly a decade since I started playing with JavaScript on the PeopleSoft application server. Back then I had to deploy a couple of JAR files to the app server. At that time, maintaining and deploying unmanaged files seemed more headache than benefit. Today Java provides full scripting support through the ScriptEngineManager and embedded Mozilla Rhino JavaScript script engine. Why would I want to script PeopleCode? Here are a few of my favorite (more...)

SJK – missing link in Java profiling tool chain

Sometimes it just happens. You have a bloated Java application at your hand and it does not perform well. You may have built this application yourself or just got it as it is now. It doesn't matter, thing is - you do not have a slightest idea what is wrong here.

Java ecosystem have abundance of diagnostic tools (thank for interfaces exposed at JVM itself), but they are mostly focused on some specific narrow kinds (more...)

The Leap Second is No Laughing Matter (if you have java on an older Linux kernel)

Earlier this month we began getting frequent email warnings from our EM12c server that some agents were experience read time outs. Then we saw that the emagent java process was using A LOT of CPU, regularly around 500% but sometimes as high as 800% as seen from "top". Restarting the agent did nothing.

I opened an SR with Oracle Support, where I was first instructed to apply a JDBC patch and then a PSU agent (more...)

Apache Drill : How to Create a New Function?

Read this article on my new blog Apache Drill allows users to explore any type of data using ANSI SQL. This is great, but Drill goes even further than that and allows you to create custom functions to extend the query engine. These custom functions have all the performance of any of the Drill primitive operations, but allowing that performance makes writing these functions a little trickier

Pinging and Posting from PeopleCode

I had a need to Ping a server to see if the server could get to it.  I also tried to post to it.  This code could be helpful for others, so I want to share it.  A post should normally go through the Integration Broker, but I first developed it at a time when I had a product that was supposed to go on servers with diverse versions of Integration Broker.

The Ping code (more...)