DEV Community: Daniel

Installation of Apache Tomcat for OOP with Tecla

Daniel — Mon, 14 Dec 2020 05:44:18 +0000

Well now it's time to talk about the practices using java for web applications. first of all we are going to need a server to run our developed apps, so in this post i will explain how to install apache tomcat for that purpose.

Step 1: Download.

You can download the latest stable version of apache in this link in the download section (the latest stable version is the one below the "beta" version), in this case, and in this time, the stable version is the 9.0.41.

In this page you will select the zip file that fits with your type of OS in the section of "Binary distributions > Core" , in my case, I will download the file "64-bit windows zip".

Configuring the apache server with the zip file is easier than configuring the executable, and if you don't need it anymore in the future, you can just delete the extracted files instead of fighting with the [un]installer.

Step 2: Installation.

Substep 1: Once you have the zip file downloaded in your coputer, go to the "Program Files [x86 for 32 bits]" folder on your computer and add a new folder called Apache.

Substep 2: Now unzip the file that you downloaded before, delete the zip file, move the unzipd folder to the "Apache" folder previously created, and there you have, Apache tomcat is now installed in your computer.

Step 3: Environment variables Configuration.

Now it's time for the configuration of the environment variables to ease the use of the server.

Substep 1: On your keyboard press the "Win"+"Q" keys to open the search bar and search for the "environment variables" ("variables de entorno") and then click open.

Substep 2: Once the "System properties" windows appear click the "environmental variables" button.

Once again we will mess up with the "CLASSPATH" environment variables, besides of the creation of a new envirnment variable.

Substep 3: First, we need to add a new environment variable with the following values.

variable	Value
TOMCAT_HOME	the route of installation of the Server

And when you are done, click the "Ok" button.

Substep 4: Now it's time to edit the "CLASSPATH" variable, click it twice from the list of variables, and at the end of the value of the variable put a semicolon (;) to separate the old values from the new one. Now add the value described in the table below. Once finished click "Ok" to exit the editor, then "Ok" again to exit the "Environment variables" window and once again to exit the "System properties" window.

variable	Value
CLASSPATH	%TOMCAT_HOME%\lib*

and that's all, now you have configured Apache tomcat for your use, adding the value to the "CLASSPATH" variable will let you use the tools of the libraries from Apache Tomcat to develop your web apps.

Installation of Java 3D for OOP with Tecla

Daniel — Fri, 27 Nov 2020 22:31:22 +0000

Now continuing with the series of posts. In this occasion I'll explain the "correct" (that worked for me after many many fails) installation of java 3D, and its configuration of the environmental variables to avoid the use of the local temporary variable CLASSPATH every time you need to compile a new program.

It's important to have only the installation that fits with your OS architecture to avoid compilation errors and exceptions with java 3D. So if you have an old installation of java that usually installs both 32 and 64 bits versions (for windows x64) you must uninstall the 32 bits version.

Step 1: Download.

As same as the previous post you need to have an Oracle Account to download this product, again you can register here and download the installer for Java 3D here, once you entered the page, select the one that fits with your OS (amd64 for x64 64 bits or i586 for x86 32 bits).

Step 2: Installation.

Now that you have the installer in your computer, run it.

Substep 1: Accept the licence agreement.

Substep 2: The Installer will show you where the new libraries will be stored.

Substep 3: Wait till the installer finishes the process and click "Close" to exit.

Step 3: Environment variables Configuration.

Now lets start with the most important part of the installation, the configuration of the environment variables. This will help you to simplify the compilation process of your practices so that way you don't need to write a very long command adding the local temporary CLASSPATH variable.

Substep 1: To start press the "Windows" + "Q" keys on your keyboard to open the search bar, type the word "variable" and select the "Environment variable" option to open its configuration.

Substep 2: Once the "System properties" windows appear click the "environmental variables" button.

The variables that we're going to edit this time are the variable "Path" of your user (or the "Path" variable of "system variables" wichever you configured in the last post), and the variable "CLASSPATH" created in te previous post, the values you are going to add are the following.

variable	Value
Path	C:\Program Files\Java\Java3D\1.5.1\bin C:\Program Files\Java\Java3D\1.5.1\lib\ext
CLASSPATH	C:\Program Files\Java\Java3D\1.5.1\lib\ext*

Substep 3: Click twice the variable "Path" that you are going to edit and add the values described in the table, once you are done click the "Ok" button to exit the variabe editor.

Substep 4: To edit the "CLASSPATH" variable, click it twice and at the end of the value of the variable put a semicolon (;) to separate the old values from the new one. Now add the value described in the table. Once finished click "Ok" to exit the editor, then "Ok" again to exit the "Environment variables" window and once again to exit the "System properties" window.

And That's all, now you can write and compile java 3D programs try it by copying the code of any example of this site.

Installation of Java for OOP with Tecla

Daniel — Fri, 27 Nov 2020 22:17:55 +0000

So... Fisrt things first, if you are a student of ESCOM and you are going to take the opp class with Tecla then this series is for you.

This is the first post of a series of 4 to configure all you need to do your oop practices. This series is intended for windows users as is the OS that I use.

During the course, Tecla is not going to teach how to install Java, Java 3D, apache tomcat or MySQL anytime, so i'll try to explain the process that at least worked for me and my classmates. Also the programs will be writen in text editors, you can use an IDE but at last that will make your work harder to integrate, so keep it as simple as possible.

To begin with, I'll explain how to install the Java runtime environment (JRE) and the Java Developmet Kit (JDK).

Step 1: Download.

To download any Oracle product you have to create an Oracle acount and you can create one by clicking this link, you can fill the information required as show the image below.

Once the registration is completed you just need to go to this site and scroll down to the "Java SE 8" section, click the download hyperlink and in the redirected page select the installer that fits with your computer (windows x64 in my case), accept the "Oracle Technology Network License Agreement for Oracle Java SE", and wait till the download finish.

Step 2: Installation.

Once you have the installer in your computer, run it.

Substep 1: Start the installation by clicking "next" in this window.

Substep 2: Select the features to be installed and click "next".

Substep 3: wait till the process finish.

Substep 4: Once this windows is shown select where where you want to install the JDK (to ease further installations of some complements as Java 3D keep the default installation route).

Substep 5: Wait till the installation finish.

Substep 6: And click "Close" to exit.

This version of the JDK includes the JRE so you don't need to download any extra file.

Step 3: Environment variables configuration.

To finish configure java in your computer you need to create or edit some environment variables so you can work with any tool to compile and execute your programs.

Substep 1: On your keyboard press the "Win"+"Q" keys to open the search bar and search for the "environment variables" ("variables de entorno") and then click open.

Substep 2: Once this windows opens click the "environmet variables" ("variables de entorno") button.

Substep 3: Wait till the next window appears and to add a new environment variable click the "New" option.

Substep 4: In the fields that appear you must to insert the next values and then click "OK".

variable	Value
JAVA_HOME	the route of installation of the JDK

Add another environment variables as before with the next values.

variable	Value
JRE_HOME	%JAVA_HOME%\jre
CLASSPATH	.;%JAVA_HOME%\lib\;%JRE_HOME%\lib\

Substep 5: Now we need to add some values to the variable "Path" if your computer have a single user or your profile is the only one that need the development tools, then you can add the next values to the variable "Path" of your user as shown in the image below, otherwise you can add them to the System variable "Path".

once you click twice that variable a window will show and you have to add the following values to the list, first click on "New" then add one of the new values and repeat the process for the rest.

values
%JAVA_HOME%\bin
%JAVA_HOME%\lib
%JRE_HOME%\bin
%JRE_HOME%\lib

Finally Click "OK" on this window, an then click again "OK" on the window of the third point of this step, restart your computer and now you can start programming with java.