Wednesday 17 July 2019

Java Programming

Java is an object-oriented programming language whose history dates back to 1994 when Sun Microsystems came up with an idea of a programming language that can be compiled and executed independent of the machine on which it is used,” says Abhinav Singh, a Shiksha expert and author of the book - Metasploit penetration testing cookbook (a book dealing with Metasploit and penetration testing).
In an interview with Madiha Jawed of shiksha.com, Singh shares the nitty gritty’s of this object oriented programming language – Java.
“In simple words, the motive of building Java was to remove the barrier of platform dependency of programming languages. This striking feature received a lot of attention and soon java became one of the sought after programming languages that could be used for small and medium sized software development purposes. As the time advanced, java grew from being a platform-friendly language to user-friendly programming as well. Its simplicity, robustness and open nature started attracting even bigger software makers of the industry and ever since there was no turning back,” he says.
Talking about 2012, Java now runs on over 3 billion different devices around the world including set-top boxes, mobile phones, automobiles, space shuttles etc. The immense popularity of the platform also attracted programmers to opt for Java as their specialised area of coding since the industry demand is high compared to other coding languages.
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How to fix common JAVA_HOME errors quickly There’s nothing worse than installing your favorite Java-based application — such as Minecraft, Maven, Jenkins or Apache Pig — only to run into a JAVA_HOME is set to an invalid directory or a JAVA_HOME is not defined correctly error as soon as you boot up the program. Well, there’s no need to fret. Here’s how to fix the most common JAVA_HOME errors. How to fix JAVA_HOME not found errors It’s worth noting that there aren’t standardized JAVA_HOME error messages that people will encounter. There are many different ways that a given JAVA_HOME error might be logged. For example, one of the most common JAVA_HOME configuration problems arises from the fact that the environment variable has never actually been set up. Such a scenario tends to trigger the following error messages: Error: JAVA_HOME not found in your environment Error: JAVA_HOME not set Error: JAVA_HOME is not set currently Error: JAVA_HOME is not set Error: Java installation exists but JAVA_HOME has not been set Error: JAVA_HOME cannot be determined from the registry How do you fix the JAVA_HOME not found problem? Well, you fix this by in the Windows environment variable editor where you can actually add a new system variable. If you know your way around the Windows operating system, you should be able to add the JAVA_HOME environment variable to your configuration and have it point to the installation root of your JDK within minutes. The Windows 10 setting looks like this: Fix JAVA_HOME not found errors As mentioned above, the JAVA_HOME variable must point to the installation root of a JDK, which means a JDK must actually be installed. If one isn’t, then you better hop to it and get that done. The JAVA_HOME is set to an invalid directory fix The next most common JAVA_HOME error message is JAVA_HOME is set to an invalid directory. The error message is delightfully helpful, because it tells you in no uncertain terms the environment variable does in fact exist. And, it also tells you it’s not pointing to the right place, which is helpful as well. All you need to do to fix this error is edit the JAVA_HOME variable and point it to the correct directory. The JAVA_HOME environment variable must point to the root of the installation folder of a JDK. It cannot point to a sub-directory of the JDK, and it cannot point to a parent directory that contains the JDK. It must point directly at the JDK installation directory itself. If you encounter the JAVA_HOME invalid directory error, make sure the name of the installation folder and the value of the variable match. An easy way to see the actual value associated with the JAVA_HOME variable is to simply echo its value on the command line. In Windows, write: >/echo %JAVA_HOME%
 C:/_JDK13.0 On an Ubuntu, Mac or Linux machine, the command uses a dollar sign instead of percentages: :-$ echo $JAVA_HOME
 /usr/lib/jvm/java-13-oracle How to find JAVA_HOME in Mac or Ubuntu Linux computers. Steer clear of the JDK \bin directory One very common developer mistake that leads to the JAVA_HOME is set to an invalid directory error is pointing JAVA_HOME to the \bin sub-directory of the JDK installation. That’s the directory you use to configure the Windows PATH, but it is wrong, wrong, wrong when you set JAVA_HOME. If you point JAVA_HOME at the bin directory, you’ll need to fix that. This misconfiguration also manifests itself with the following error messages: JAVA_HOME is set to an invalid directory Java installation exists but JAVA_HOME has been set incorrectly JAVA_HOME is not defined correctly JAVA_HOME does not point to the JDK Other things that might trigger this error include spelling mistakes or case sensitivity errors. If the JAVA_HOME variable is set as java_home, JAVAHOME or Java_Home, a Unix, Linux or Ubuntu script will have a hard time finding it. The same thing goes for the value attached to the JAVA_HOME variable. The JAVA_HOME does not point to the JDK error One of the most frustrating JAVA_HOME errors is JAVA_HOME does not point to the JDK. Here’s a little bit of background on this one. When you download a JDK distribution, some vendors include a Java Runtime Environment (JRE) as well. And when the JAVA_HOME environment variable gets set, some people point it at the JRE installation folder and not the JDK installation folder. When this happens, we see errors such as: JAVA_HOME does not point to a JDK JAVA_HOME points to a JRE not a JDK JAVA_HOME must point to a JDK not a JRE JAVA_HOME points to a JRE To fix this issue,  see if you have both a JRE and JDK installed locally.


Classification of Java
Based on popularity, usability and industry demand, java can be categorised under the following sections:
  • Client side Java development: This section of java is based on developing softwares and program modules that can run on client side to support its daily operations. E.g. SAP
  • Server side Java development: This section of java is based on developing codes that can enable others to access dedicated servers designed to perform specific tasks. E.g. Creating a stand-alone database server
  • Web Development: Java libraries are also extended to Java server pages (JSP) that helps in rich content development for Web
  • Mobile Development: Java is actively implemented as a standard language for developing mobile operating systems and applications. Eg Android
  • Machine learning through Java: Recent advancement in Java is in the direction of Machine learning which has helped in building and supporting several electronic devices ranging from Space shuttles to CT scan machines
Career relevance
Looking at the above classifications, we will notice the wide implementation of a single programming language. Java can actually be treated as a combination of multiple languages under a common platform. This wide categorisation of Java makes it difficult for an individual to completely understand its every nook and corner. Every categorisation of java requires its own experts. This is the reason why Java produces good career opportunities for enthusiasts who are willing to build a career in the field of software development and programming.

2 comments:

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