This document discusses the challenges of creating a GlassFish buildpack for Cloud Foundry. It summarizes the key changes needed to port the GlassFish application server to the Cloud Foundry platform, including modifying the context root to match Cloud Foundry standards, changing logging to output to standard out, and loosely coupling the application with database configuration by reading environment variables rather than a config file. Examples are provided of accessing database connection information from environment variables and using auto binding of services to inject datasources. The goal of the buildpack is to help migrate enterprise Java applications using GlassFish from on-premise to cloud environments.

1. 2016.6.1
Kenji Kazumura
Fujitsu Limited
Challenge for
GlassFish Buildpack
Copyright 2016 FUJITSU LIMITED
Cloud Foundry Tokyo Meetup #2

2. About me
Copyright 2016 FUJITSU LIMITED
Java VM developer
Working for Fujitsu
Interstage Application Server
JSR 204 Expert Group
Board Member of Executive Committee
Author of On-line Java Learning Courses
https://directshop.fom.fujitsu.com/shop/commodity_param/ctc/el_middleit/shc/0/cmc/ASP03737
JCP (Java Community Process)
https://directshop.fom.fujitsu.com/shop/commodity_param/ctc/el_middleit/shc/0/cmc/ASP03738
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3. Agenda
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Motivation
GlassFish Buildpack
RDS
Context Root
Summary
Logging
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4. Motivation
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Why we need GlassFish ?
Based on Tomcat
Java Buildpack already exists
Standardized framework on which
WebSocket, JAX-RS, JPA, etc is available
Play and Spring also available
Enterprise system like this
Help migrating from on-premise to cloud
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5. GlassFish Buildpack
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Based on GlassFish 4.1 WebProfile
Servlet 3.1
JavaServer Pages(JSP) 2.3
Unified Expression Language(EL) 3
Debugging Support for Other Languages (JSR-45) 1
JavaServer Pages Standard Tag Library(JSTL) 1.2
JavaServer Faces(JSF) 2.2
Java API for RESTful Web Services(JAX-RS) 2
Java API for WebSocket(WebSocket) 1
Java API for JSON Processing(JSON-P) 1
Common Annotations for the Java Platform (JSR-250) 1.2
Enterprise JavaBeans(EJB) 3.2 Lite
Java Transaction API(JTA) 1.2
Java Persistence API(JPA) 2.1
Bean Validation 1.1
Managed Beans 1
Interceptors 1.2
Contexts and Dependency Injection for the Java EE Platform 1.1
Dependency Injection for Java
APIs
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6. Challenge
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20 engineers
5 months
No one had experience to use
Cloud Foundry before
All are application server developers
Start project without Cloud Foundry
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7. Context Root
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Context root is different between
GlassFish and Cloud Foundry standard
You can use old way by setting
FJBP_CONTEXT_ROOT to ‘app’
URL
Cloud Foundry app.paas.fujitsu.com
GlassFish app.paas.fujitsu.com/app
‘app’ is a name of your application
Change GlassFish default URL to
the same as Cloud Foundry standard
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8. Logging
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Local storage should not be used
on Cloud Foundry
GlassFish supposes local storage
http access logs
logs of GlassFish itself
Change all output to standard out
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9. Relational Database Service
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On-Premise
Tightly coupled with JDBC
Describe JDBC information at config file
Cloud
Should couple loosely with JDBC
How do you do that ?
Usually get info from environment vars
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10. Example1
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public class DBAccess extends HttpServlet {
Connection getConnection() {
String env = System.getenv("VCAP_SERVICES");
if ( env != null ) {
try {
JsonReader reader = Json.createReader(new StringReader(env));
JsonObject servicesObject = jsonReader.readObject();
reader.close();
JsonObject rdsObject = servicesObject.getJsonObject("fujitsurds");
String uri = rdsObject.getString("uri");
Connection connection = DriverManager.getConnection(uri);
return connection;
} catch ( Exception e ) {
return null;
……
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11. Example2
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public class DBAccess extends HttpServlet {
@Resource (name = “jdbc/porstresqlService”)
private DataSource ds;
…
GlassFish Buildpack provides
auto binding feature
‘postgresqlService’ is the name of the service bound to your app
i.e.
% cf bind-service myApp postgresqlService
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12. Summary
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Give it a try !
Any feedbacks are appreciated
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13. Q/A
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14. Copyright 2016 FUJITSU LIMITED
Trademarks of other companies are used in this documentation only to
identify particular products or systems.
Oracle and Java are registered trademarks of Oracle and/or its affiliates.
Other company and product names in this documentation are trademarks or
registered trademarks of their respective owners.
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15. Copyright 2010 FUJITSU LIMITED