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CUSTOMER
Riley B Rainey
Cloud Architect, Global SAP Cloud Platform Team
Olingo Unleashed – using Olingo JPA for prototyping and production SAP Cloud Platform
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The information in this presentation is confidential and proprietary to SAP and may not be disclosed without the
permission of SAP. This presentation is not subject to your license agreement or any other service or subscription
agreement with SAP. SAP has no obligation to pursue any course of business outlined in this document or any related
presentation, or to develop or release any functionality mentioned therein. This document, or any related presentation
and SAP's strategy and possible future developments, products and or platforms directions and functionality are all
subject to change and may be changed by SAP at any time for any reason without notice. The information in this
document is not a commitment, promise or legal obligation to deliver any material, code or functionality. This
document is provided without a warranty of any kind, either express or implied, including but not limited to, the implied
warranties of merchantability, fitness for a particular purpose, or non-infringement. This document is for informational
purposes and may not be incorporated into a contract. SAP assumes no responsibility for errors or omissions in this
document, except if such damages were caused by SAP´s willful misconduct or gross negligence.
All forward-looking statements are subject to various risks and uncertainties that could cause actual results to differ
materially from expectations. Readers are cautioned not to place undue reliance on these forward-looking statements,
which speak only as of their dates, and they should not be relied upon in making purchasing decisions.
Legal disclaimer
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About Olingo
A Sample Olingo JPA project
Olingo JPA Project Structure in source code
Two Quick Approaches to defining your own OData model using JPA
Deploying Java web apps on SAP Cloud Platform
Tricks and Summary
Today’s Agenda
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Essentials
• Familiarity with OData web services
• Java development in Eclipse
• Maven
Helpful
• Familiarity with
• Java Persistence Architecture (JPA) APIs
• Eclipse JPA tooling
• JPA Annotations
Skills you will need
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Implements the OData web services protocol
Server
• OData V2 Java
• OData V4 Java
Client
• Java
• JavaScript V4
• OData used extensively in SAP client
software, including Fiori (SAPUI5), Web
IDE, and Mobile Platform
About Olingo
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Olingo includes several Maven Archetypes
useful for creating sample projects to use as
starting points for new projects.
See Olingo 2 documentation for information
about the JPA archetype.
mvn archetype:generate \
-DinteractiveMode=false \
-Dversion=1.0.0-SNAPSHOT \
-DgroupId=com.sample \
-DartifactId=my-car-service \
-DarchetypeGroupId=org.apache.olingo \
-DarchetypeArtifactId=olingo-odata2-sample-
cars-service-archetype \
-DarchetypeVersion=RELEASE
If you insist on doing this the long way …
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https://github.com/SAP/sap_mobile_platform_espm_olingo_services
Start with a template project
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Elements of the Olingo JPA Project
web.xmlService
Factory class
JPA Object 1
JPA Object n
persistence.xml
.
.
.
Java CodeWEB-INF
Your JPA
persistence unit
Table 1
Table n
.
.
.
Database
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Logically connects a URL pattern to your
OData API
Connects the OData Service to your JPA Entity
Manager factory
Other Initialization (more on this later)
WEB-INF/web.xml – set Olingo Service Factory Class
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Top Down
“I can define Java classes to represent my new
OData service”
• Define your object model as Java Objects
• Add JPA Annotations to define relationships
• JPA in your OData web service project will
generate the schema on-demand
Bottom Up
“I have an existing SQL database and I want to
make an OData service out of it”
• Use Eclipse JPA tooling convert your
existing SQL database schema to JPA
entities in your project.
• Tables, columns, relations inspected
• JPA Annotations generated automatically
Leveraging JPA in an Olingo Project – Two Paths
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Elements of the Olingo JPA Project
web.xmlService
Factory class
JPA Object 1
JPA Object n
persistence.xml
.
.
.
Java CodeWEB-INF
Your JPA
persistence unit
Table 1
Table n
.
.
.
Database
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Trick #3
Preload Initial Data Sets
• Your Service Factory class
can be programmed to
detect “first call” and load an
initial data set
Trick #2
Tune the naming in your data
model
• An XML file can be used to
tweak the OData Object,
Property, and Association
names
• Use
setJPAEdmMappingModel()
Trick #1
Use an embedded SQL
database
• Choice of Derby or
Hypersonic (hsqldb)
• Each user gets a private
copy (modify at will)
• Destroyed when you stop
the server (at least in SAP
Cloud Platform)
Olingo JPA Prototyping Tricks
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Apache Olingo site
https://olingo.apache.org/
Sample project used in this presentation
https://github.com/SAP/sap_mobile_platform_espm_olingo_services
Example of Cloud Platform Users as Objects in an OData model (using Java & neo SDK)
https://github.com/SAP/cloud-olingo-identity-ochat
Another approach to integrating a existing JPA project
https://olingo.apache.org/doc/odata2/tutorials/CreateWebApp.html
Get a SAP Cloud Platform Free Trial Account
https://cloudplatform.sap.com/index.html
References
SAP‘s Digital Transformation Platform
SAP S/4 HANASAP
BW/4 HANA SAP Cloud Platform
SAP Cloud Applications
CustomerSpecific
and 3rd PartyApplications
BusinessObject Cloud
and Digital Boardroom
SAP API Business Hub
Business Services IoT ServicesML ServicesUX Services Mobile Services
Big Data Cloud
VoraSAP HANA
SAP Fiori
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services are those that are set forth in the express warranty statements accompanying such products and services, if any. Nothing herein should be construed as
constituting an additional warranty.
In particular, SAP SE or its affiliated companies have no obligation to pursue any course of business outlined in this document or any related presentation, or to develop
or release any functionality mentioned therein. This document, or any related presentation, and SAP SE’s or its affiliated companies’ strategy and possible future
developments, products, and/or platform directions and functionality are all subject to change and may be changed by SAP SE or its affiliated companies at any time
for any reason without notice. The information in this document is not a commitment, promise, or legal obligation to deliver any material, code, or functionality. All forward-
looking statements are subject to various risks and uncertainties that could cause actual results to differ materially from expectations. Readers are cautioned not to place
undue reliance on these forward-looking statements, which speak only as of their dates, and they should not be relied upon in making purchasing decisions.
