Java Expert....Java/Open Source Addict

Redes Sociales

twitterlinkedinrss feedemail youtube

lunes, 26 de noviembre de 2018

Install Docker on Centos 7

Hello friends, in this opportunity I am going to review how to install the Docker on Centos 7. For this we need to do the following:

1.- First, we need to install the followings dependencies: yum-utils, device-mapper-persistent-data and lvm2. In my case I have installed.

2. Next we need to add the docker repository.

3.- Then, we need to install docker using the yum install docker-ce command.

During the installation process, we need to accepted  the information key.

4.- Finally, when the installation has finished. We need start up the docker service executing the systemctl start docker command and verify it through the docker run hello-world command.


lunes, 5 de noviembre de 2018

Install NodeJS on Centos 7

Hello friends, in this post I am going to show how to install NodeJS on Centos 7. For do this, we need to do the following.

1.- First go to the Node download page and download it.

2.- Next uncompress the package on directory you like.

3.- Then, configures the NODE_HOME environment variable. In my case I will configure on the root account in the /etc/profile file. For this we need to log as like root user.

4. After that, you must to update the environment variables executing the source /etc/profile command in both root and user account o also we can reboot the machine.

5.- Finally, we need to test the node version with the node -v command.

martes, 30 de octubre de 2018

Install GIT on Centos 7

Hello friends, in this post I'm going to show how to install GIT on Linux, specifically Centos 7. For this we need to do the following

1.- Firts go to the GIT page and download it. 

2.- In the Centos case, we need to install git using the yum install git command. Don't forget execute the command as root user.

3.- Once installed, we need to configure the user and email address. This information is known like as Identity Information. It will be used in every commit. For this we need to execute the following commands.

4.- After that to check the configuration. We need to execute the git config --list command.

 5.- Finally as optional, we could add the git.exe to PATH.

miércoles, 24 de octubre de 2018

Install OpenJDK on MAC Computer

Hello friends, in this post I'm going to show how install the OpenJDK on Mac computer using Homebrew Package Manager . This way is very simple, for this we need to do the following:

1.- First install homebrew package manager, the indications how to do this is here.
2.- Next open a console o terminal and execute the brew tap homebrew/cask-versions command to update versions.

3.- Next execute the brew cask install adoptopenjdk8 command to install the openJDK.

4.- After that we must configure the JAVA_HOME environment variable in the .bash_profile file with the value  /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/ and export it.

Don't forget re-open the terminal to update the .bash_profile file.

5.- Finally verify the java version with the java -version command.

viernes, 19 de octubre de 2018

Change Password on Mac

Before I show us how to change the password on Postgres is important say us that I used the  program to install Postgres on Mac. It is a tool  that let us manages the database from easy way. However the default installation doesn't include password.

To change the password  we must do the following steps:
  1. Go to the /Applications/ directory and execute the ./psql --u postgres command.
  2. Next we need to change the password throught the \password command. We need to enter the password twice times.
  3. Next quit the postgres console.

4. After that we need to change the autentication method of trust to md5 in the pg_hba.conf  file  located in /Users//Library/Application Support/Postgres/var-10/pg_hba.conf, where is the username of computer.

       5. Finally we need to restart the, for this we must stop the database and start again.

Configuración EclipseLink WildFly 10

Estimad@s amig@s,

En el caso de que se requiera trabajar con la capa de persistencia eclipselink en el servidor de aplicación WildFly (que viene configurado por defecto con Hibernate) se necesita realizar los siguientes pasos:

  1. Descargarse la capa de persistencia eclipselink, proceder a descomprimirle y copiar del directorio  jlib el archivo eclipselink.jar
  2. Ubicarse en el directorio /modules/system/layers/base/org/eclipse/persistence/main y proceder a copiar el archivo eclipselink.jar, donde es el lugar de instalación del WildFly.
  3. Proceder a editar el archivo module.xml referenciando al nombre de la librería (jar descargado) y excluyendo las clases del path javax que vienen precargadas en el servidor como se muestra a continuación.

 4. Finalmente reiniciar el servidor y estaremos listos para trabajar en nuestro servidor de aplicación con la capa de persistencia eclipselink.

Nota: En el caso de estén utilizando una versión anterior a WildFly 10. se deberá incluir la propiedad eclipselink.archive.factory  para poder ubicar las clases de JPA. Como se muestra a continuación.

viernes, 31 de agosto de 2018

JDBC Connection Pool - Resource Type Datasources

When we need to configure the connection pool on Glassfish or Payara Server, could be that the Resource Types Datasources options are not clear. Because in this post I going to explain the differences between them.

Resource Types Datasource

  • javax.sql.Datasource.- This datasource type is used in applications that manage a global transaction that always involves just one resource. Sometimes called local transactions. This datasource is related with No-XA Transaction.
  • javax.sql.XADatasource.-  This datasource type is used in applications that manage distributed transactions with one or more databases or other resources like JMS. This datasource is related with XA Transaction.
  •  javax.sql.ConnectionPoolDatasource.- This datasource type is more general, produces a connection (PooledConnection) object that will automatically participate in connection pooling. This implementation works with a middle-tier connection pooling, generally isn't used by a programmer.

Datasource Hierarchy (Ref: shengwangi)