Thursday, September 10, 2015

How to install Maven on CentOS

Steps to install and configure Maven on CentOS

  • Download the tar.gz file from Apache Maven site
  • Untar the file at some location (Eg: /opt/maven)
    • tar xzf <filename>
  • Add the environment variable to ~/.bash_profile file
    • cd $HOME
    • vi ~/.bash_profile
      • Append PATH variable with maven path
      • Add M2_HOME variable
      • export M2_HOME
    • Save and restart your system


  • Verify maven installation
    • mvn --version

How to install and configure Apache Tomcat 7 on Cent OS

Here are the steps to install and configure Apache Tomcat 7 on Cent OS :



  • Stop the tomcat
    • sh /opt/tomcat7/bin/shutdown.sh

  • [Optional] To access admin|manager pages, you need to create user accounts. Add below lines inside <tomcat-users></tomcat-users> tags in ${tomcat7}/conf/tomcat-users.xml file.
    <role rolename="manager-gui"/>
      <user username="manager" password="root123" roles="manager-gui"/>
      <role rolename="admin-gui"/>
      <user username="admin" password="root123" roles="manager-gui,admin-gui"/>




How to install and Configure Apache Http Server on Cent OS

Here are the steps to install and configure Apache WebServer on Cent OS :
  • Install Apache HTTP Server (By default Cent OS comes with Apache)
    • yum install httpd
  • Set to Chkconfig to start on boot
    • chkconfig --level 235 httpd on
  • Uncomment below line from configuration(/etc/httpd/conf/httpd.conf) file
    • NameVirtualHost *:80
  • Restart Apache Http Server
    • service httpd restart
  • Verify Apache Server
    • Goto your browser and check localhost or localhost.localdomain It will display Apache Test Page



How to install and configure MySQL on Cent OS

Here are the steps to install and configure MySQL on Cent OS :
  • Install MySql Server
    • yum install mysql-server mysql php-mysql
  • Set to Chkconfig to start on boot
    • chkconfig –level 235 mysqld on
  • Start the MySQL service
    • service mysqld start
  • Set the password for all domains
    • myql -u root
    • SET PASSWORD FOR 'root'@'localhost' = PASSWORD('new-password');
    • SET PASSWORD FOR 'root'@'localhost.localdomain' = PASSWORD('new-password');
    • SET PASSWORD FOR 'root'@'127.0.0.1' = PASSWORD('new-password');
  • Exit and verify the MySQL version
    • exit
    • mysql --version
      • mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1




How to install GIT on CentOS

It is quite easy to install GIT using YUM command line manage utility on CENT OS 6.

Install :

# yum clean all
# yum install git

Verify Subversion : 

# git --version

Thanks..!!!

Monday, August 24, 2015

How to add MySQL component in the Tivoli Directory Intregator (TDI).

To support MySQL database in the TDI, You first need to add mysql driver into the TDI

Here are the steps :
  • Download and copy mysql (mysql-connector-java-5.1.23-bin.jar ) jar to the location "${IBM}\TDI\V7.1\jars\3rdparty\others" where IBM is your installation directory
  • Restart TDI if it's running.
  • Click on Add component under AssemblyLines and choose JDBC connector
  • In JDBC URL,  add “jdbc:mysql://<IP>:<PORT>/<DATABASE_NAME>”.
  • in JDBC Driver, add com.mysql.jdbc.Driver
  • Provider correct Username and Password of your database.
  • Select table Name from select button.
  • Click Finish to connect to the MySQL Database.



Friday, June 26, 2015

org.hibernate.HibernateException: No Session found for current thread

I am working one Spring MVC project in which I have integrated Spring with hibernate and most of the time, I use to get this error message while performing database operation ..

org.hibernate.HibernateException: No Session found for current thread

Reason : This is happening because I have missed declaring the transaction in my Spring Application. sessionFacory needs transaction to work.

Solution :

Define transaction manager in your Spring configuration file. Here is my spring-config.xml file :


<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${db.driverClassName}" />
<property name="jdbcUrl"
value="jdbc:mysql://${db.host}:${db.port}/${db.name}" />
<property name="user" value="${db.username}" />
<property name="password" value="${db.password}" />
</bean>

<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"
depends-on="provDB">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="PACKAGE_NAME" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${db.dialect}</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>

<bean id="dao" class="DAO_IMPL_CLASS.DaoImpl">
<property name="sessionFactory" ref="sessionFactory" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>

and Add @Transactional annotation on your service function

@Override
@Transactional
public String saveConfiguration(...) {
daoImpl.saveConfiguration(configuration);
return "issue_resolved";
}

I guess, It can be useful to many prople.. Happy Coding..!!!

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