Demonstration of moving existing java app to amazon ec2 and Google app engine

1. Porting
Java
Web Application
To
Enterprise Cloud
Abhishek Chikane
05 August 2011

2. What
We are
Going
To discuss
Today?

3. What Is Cloud?

4. How To Develop Apps on Cloud?
printf(“Hello World”);

5. How To Port Your Java Web App on
Cloud?
System.out.prinln(“Hello World”);

6. Why?

7. What You Are Going To Do?
Move
Your DB
To Cloud
?

8. Flavors Of Clouds?
Software
As
Service
Platform As
Service
Infrastructure
As Service

9. Web Application

10. Web Application On Cloud

11. Amazon Web Service Infrastructure As Service

12. Amazon Web Service Java Web Application
Use JDBC String

13. Google App Engine Platform As Service

14. Google App Engine Platform As Service
No JDBC Support

15. Google App Engine Platform As Service
Google Web Application Project
Structure Of
Project

16. Google App Engine Platform As Service
JSP
Compilation Change It To JDK Path
Issue

17. Google App Engine Platform As Service
Google App Engine Data Store
Entity
Table Row
Data Store
Kind
Table
JPA/JDO Configuration

18. Google App Engine Platform As Service
Need To Change The Primary Key Data
Type To java.lang.Long Type
Why?
Primary Keys Of Integer, Float or any other data type
Entities will not work

19. Google App Engine Platform As Service
What?
Tell OGNL to not do security manager permission checks
Running Struts Why?
GAE has a security manager and you don't have the
ability to add the OGNL-specific permissions
How?
place for this is in a Servlet context listener, executing
when the context is initialized
OgnlRuntime.setSecurityManager(null);
In Dev Environment need to override
Freemarker Class

20. Google App Engine Platform As Service
Either Setup Proper Relation Among
The Entities and Use JPA For Join
Or Make Plain Queries
Join Queries

21. Google App Engine Platform As Service
Lists returned by Data Nucleus Query
API is not serialized
What Is The Error?
Data Nucleus List Query results list object can not be
Serialization accessed
How To Fix It?
Copy the query results into
ArrayList/Vector

22. Google App Engine Platform As Service
Update the object in session after each
change of value.
Session Handling Why?
The session object is not passed by
reference

23. Google App Engine Platform As Service
Java Logging
If I have System.out.printlns In My
App?
Logging Set logger level <= INFO
Configuration
Where To See Logs?

24. Google App Engine Platform As Service
Remove Jars, Classes Of Not
Supported APIs/Frameworks From
Your Application
Class Loading e.g. Hibernate
Problem EJB
JAX-RPC
JAX-WS
JDBC
JMX
JMS
JNDI
RMI etc.

25. Google App Engine Platform As Service
Very Dangerous Error
Error 203
How To Avoid?
Do not put any CPU intensive
processing in one request

26. Google App Engine Platform As Service
• Sometimes Needs Eclipse Restart
For Servlet Changes
Tips For • Need Dev Server Restart For Other
Development Changes
Environment
• If App Fails To Deploy In
Between, Rollback Using AppConfig
Command And Try Again
• Do Not Use Dot (.) In Version
Values

27. Google App Engine Platform As Service
Structure Running Data
of Project JSP Struts Nucleus List
Primary Serialization
Compilation
Error 203 Issue
Keys of
Entities
Data Store Tips for Join Logging Session Class
Development Configuration
Environment Queries Handling Loading
Problem

28. Salesforce

29. Thanks
Abhishek Chikane
5 August 2011