Java Fundamentals

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Learn Something New Every Day (And Actually Do Something With It)




Subject: Java Fundamentals

Topics:

  1. What is Java
  2. JRE vs JDK 
  3. Installation of Java
  4. How Java code converts to Class File
  5. What is IDE
  6. Popular IDE's available
    • NetBeans
    • Eclipse
    • IntelliJ Idea



Popular Posts

JMeter Producing Error: Windows RegCreateKeyEx(...) returned error code 5

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After running JMeter.bat on Command Line, Problem java.util.prefs.WindowsPreferences <init> WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5. Cause Environment Resolving the problem The error occurs because java.util.prefs.WindowsPreferences is trying to save information in HKEY_LOCAL_MACHINE\Software\JavaSoft\Prefs instead of under HKEY_CURRENT_USER\Software\JavaSoft\Prefs. Windows 7 64-bit The work around is to Open JMeter.bat file as the administrator and so it creates the key HKEY_LOCAL_MACHINE\Software\JavaSoft\Prefs.
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Understanding about Contract Testing

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Yesterday Morning (9th May 2020), I had good discussion with  Sundaresan  Krishnaswami on " Contract Testing ". I thank  Sundaresan   for his time and sharing his knowledge. It started with an example: The Owner provides the house or Place of Residence to the Tenants. "Rent Agreement" is provided for the house and It contains agreement to use the house. The house comes with like kitchen, living room, bed room, fans, geysers etc.. It also contains who resides and what is the contractual period, obligation (money) etc.. Here, Owner is the Server and Tenant is Client.                                         Client-Server Architecture. Illustrating the same in the E-Commerce Context: In Some Development Companies, There can be two teams developing the Payments and Orders APIs. In B2B or B2C Ecommerce applications, we place an order using web browser through payment methods and Order is created. Order is successful only when Payment is successful. In general, Payments te
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