Remove MySql Ubuntu

To remove mysql completely from your system Just type in terminal

sudo apt-get purge mysql-server mysql-client mysql-common mysql-server-core-5.5 mysql-client-core-5.5

sudo rm -rf /etc/mysql /var/lib/mysql

sudo apt-get autoremove

sudo apt-get autoclean

How to install OpenJDK 8 Ubuntu

Use this commends to Install

1. sudo add-apt-repository ppa:openjdk-r/ppa
2. sudo apt-get update
3. sudo apt-get install openjdk-8-jdk
4. sudo update-alternatives --config java
5. sudo update-alternatives --config javac

Please check that the PPA name or format is correct. Issue

configure your  /etc/apt/apt.config file as follows: etc/apt/apt.config

Acquire::http::proxy "http://<username>:<password>@<proxy address>:<port>/";

 export your proxy environment variables using

export http_proxy=http://username:password@host:port/
export https_proxy=https://username:password@host:port/

and then tell sudo to use them using:

 sudo -E add-apt-repository ppa:webupd8team/y-ppa-manager

Solr Tutorials

link to learn solr
https://examples.javacodegeeks.com/enterprise-java/apache-solr/apache-solr-tutorial-beginners/
https://examples.javacodegeeks.com/enterprise-java/apache-solr/solr-schema-xml-example/
http://lucene.apache.org/solr/quickstart.html
https://cwiki.apache.org/confluence/display/solr/Getting+Started+with+SolrCloud

some example commends
java -Dauto -Dc=gettingstarted -Drecursive -jar example/exampledocs/post.jar  docs/quickstart.html
java -Dauto -Dc=holmes -Drecursive -jar example/exampledocs/post.jar  training/
solr create -c holmes -d basic_configs
java -Dauto -Dc=gettingstarted -Drecursive -jar example/exampledocs/post.jar  docs/quickstart.html
http://localhost:8983/solr/gettingstarted/select?q=*%3A*&wt=json&indent=true
solr delete -c collection_name