Blog of a fellow buddy ;)

James Blog!

OAuth 2.0 | How it works!

http://tools.ietf.org/html/draft-ietf-oauth-v2-22

Google App Engine Project using Maven

Since folks from google have created the archetypes for Google App Engine Web projects it is takes seconds to actually create a sample web application and deploy it!
In the post I am going to show you how to do just that, read on..

#Create a maven project using app engine archetype 
mvn archetype:generate -Dfilter=com.google.appengine:

#Select an archetype of choice 
#At the time of writing this blog post, following are the options available
Choose archetype:
1: remote -> com.google.appengine.archetypes:appengine-skeleton-archetype (-)
2: remote -> com.google.appengine.archetypes:guestbook-archetype (-)
3: remote -> com.google.appengine.archetypes:skeleton-archetype (-)
4: remote -> com.google.appengine.demos:guestbook-archetype (-)

Note: Run the following maven commands inside the project directory where the .pom exists
#Verify the demo application
mvn verify

#Start the app engine devserver on your machine 
mvn appengine:devserver

#Test the demo application locally
http://localhost:8080

#Update the 'appengine-web.xml' with the following details
{appengine.app.id}
${appengine.app.version}

####### Deploy the application on app engine 
mvn appengine:update

#The END!
Now you will be able to use the app url and access the application default being
http://{appengine.app.id}.appspot.com
https://{appengine.app.id}.appspot.com

HBase Query Results to File

1. Create a file hbase_query with all your HBase Queries
2. Run the following command
cat hbase_query | hbase shell > hbase_output

Apache HBase Operational Manager Guide

http://hbase.apache.org/book/ops_mgt.html

How to type control characters into a file using Vi

Its simple.. For example if you need to write ^@ in a file in unix
1. Open the file in insert mode using vi
2. Use the keys in the order they have been listed
(ctrl+v) + (ctrl+@)
All it means is keep the ctrl key pressed and use v & @ in close succession

Most frequently used Maven Plugins

maven-assembly-plugin
A plugin to package a runnable jar with all its dependencies.
'SkipAssembly' property when set to false packages the dependencies inside the jar!

false

'manifest' tag can be used to set the jar manifest entries

 
         com.bytemeagain.json.JsonPrettyPrinter
         com.bytemeagain.json

  
    maven-assembly-plugin
    
     
      jar-with-dependencies
      package
      
       single
      
      
       
        jar-with-dependencies
       
       false
       
        
         com.bytemeagain.json.JsonPrettyPrinter
         com.bytemeagain.json
        
        
         development
         https://github.com/homebrewcode/java
        
       
      
     
    
  

---

maven-javadoc-plugin
A plugin to create java-docs using the java-doc comments in your codebase

   
    org.apache.maven.plugins
    maven-javadoc-plugin
    
     
      attach-javadocs
      
       jar