Introduction to Java Micro Edition (ME) 8

Graphic Section Divider

Java Micro Edition (ME) 8
Introduction
Terrence Barr
Senior Technologist & Product Manager
Oracle
Sep, 2013

Safe Harbor Statement
The following is intended to outline our general product direction. It is intended
for information purposes only, and may not be incorporated into any contract.
It is not a commitment to deliver any material, code, or functionality, and should
not be relied upon in making purchasing decisions. The development, release,
and timing of any features or functionality described for Oracle s products
remains at the sole discretion of Oracle.

Java ME 8:
The Platform for the
Internet of Things

Agenda
§  The Rise of the Internet of Things: Drivers behind Java ME 8
§  Java ME 8: Background and Overview
§  Java ME Connected Limited Device Configuration (CLDC) 8
§  Java ME Embedded Profile (MEEP) 8
§  Device I/O API (DIO)
§  Conclusion and Call to Action
Note:
Java ME 8 is still under development and information presented here is subject to change.

The Rise of the
Internet of Things:
Drivers behind Java ME 8

x86 Architecture/
Windows OS
Standards Based
Hardware & Software
Proprietary Hardware
& Software
1960 - 1985
Host Era
2006 - 2025
Internet of Things
1985-2006
PC Era
The 3rd IT Revolution

Challenges the Embedded Industry is facing
•  Multitude and variety of
devices
•  Security, privacy, reliablity
•  Remoteness, no human
control
•  Provisioning, management
and monitoring
•  Data flow and analytics
•  Interoperability and
standards
Explosion of Devices: What’s keeping You awake at night?
•  Long device lifecycle
•  Connectivity, cost,
infrastructure, bandwidth
•  Device cost, power
requirements
•  Developer productivity
•  Development cost, skill
sets, re-use
•  Time-to-market

Drivers behind Java ME 8
Requirement Description
Modern embedded
software platform
•  Robust, secure, cross-platform software execution environment
•  Modular software system and remote operation extends product
value and reduced cost/risk
•  Leverage feature-rich platform and focus on your value-add
Efficient software
development and
deployment model
•  Address the challenges of traditional embedded development
•  Accelerate time-to-market
•  Enable software portability and economies of scale
•  Leverage large ecosystem of expertise and partners
Increased market reach •  Platform “right-sizing” allows to address wide range of use cases
and target markets with a single software model, from low-
footprint devices to more powerful systems
Open, based on
standards, interoperable
•  Avoid vendor lock-in
•  Participate in and benefit from technology innovation
•  Integratable with many industry standards
Meeting the Challenges of the Internet of Things

Java ME 8:
Background and Overview

Unifying the Java Ecosystem for Embedded
•  Java ME 8 is the “little sibling” of Java SE 8
•  Portability of applications and libraries across the Java Platform
•  Java ME vs. Java SE is a footprint/functionality tradeoff
•  Java ME & Java SE release cycles are in sync
Key
Principles
•  Modern and flexible platform for delivering embedded software
•  Unified development experience & community across Java
•  Aligned Java language, core APIs, development, and tools
•  Enable 9+ Million Java developers to develop for Java Embedded
Benefits
Enabling Java Developers to be Embedded Developers

Java ME 8: Key Themes and Features
•  Major step in Java ME Java SE alignment
•  Dedicated and optimized embedded application platform
•  Enable increased range of use cases and markets
Themes
Key
Features
•  Java ME CLDC 8: Updated VM + alignment with Java SE 8
•  Java ME Embedded Profile 8: Embedded Application Platform
•  Value-add new and enhanced APIs and features for embedded
•  Improved configurability and optimized footprint
•  Target devices as low as at 128 KB RAM, 1 MB Flash/ROM
Target
Markets
•  Small to mid-embedded covering wide range of use cases/markets
•  Intelligent edge devices, communication nodes, healthcare
devices, smart sensors, smart meters, other IoT/M2M solutions

Java ME 8 Focus
Platform
Footprint
Device
CPU/
GPU/I-OARM 7 Cortex M ARM9/11 MIPS32 - ARM Cortex A – PPC - Intel Atom
50KB-1MB
1MB-10MB
10MB-100MB Java ME
Java SE
Java
Card

Java ME 8 Platform Overview
Java VM
Additional
APIs
(Examples)
Java ME Connected Limited Device Configuration (CLDC) 8 (JSR 360)
Additional
Optional APIs
On-Device I/O
Access
Vertical Specific
APIs
Location
Messaging
Wireless
Communication
Web Services
Protocols and
Data Conversion
Sensors
Additional
Optional JSRs
Security and
Management
Applications Applications Applications Applications
Application Platform
Java ME Embedded Profile
(MEEP) 8 (JSR 361)
On-Device I/O
Access
Device I/O
API
SATSA
Security and Trust
Services
Generic Connection
Framework
GCF 8

Java ME 8: A Service-Enabled Platform
Extend lifetime, flexibility, and value
–  Create cross-platform, modular software applications
–  In-field s/w upgrades while maintaining system integrity
–  Reduce device certification and testing overhead
Hardware Platform
OS + Core Services
Java ME 8 Platform
Traditional Platform Java System
Component
Cloud
(Network/
Enterprise)
OS + Core Services
Hardware Platform
Native Application
Loadable Applications
and Services
Limited flexibility, high cost
–  H/W-S/W interdependencies
–  Upgrade complexity
–  Impact on security/integrity
Bringing software modularity to resource-constrained systems

Embedded Application(s)
Virtual Machine
Optional JSR
System
Controller
Communication
Management
Device
Management
Tooling
Agent
Software
Provisioning
Identity
Management
Messaging
Monitoring &
Logging
Data Store &
Sync
Web Server
Other Services/
Protocols
Graphics/UI
Optional JSR
Java ME 8: Oracle Product Strategy
An extensible, customizable application platform
Oracle Java ME
Embedded
Product
Building Blocks (Oracle or
partners): Services and/or
Libraries
Oracle or
3rd Party JSRs
3rd Party
Enhancement
3rd Party
Enhancement
3rd Party
Enhancements
• Local Peripherals
• IoT Network
• Enterprise
Note:
Preliminary - Not all components
shown are currently available
Local or
Network
Interfaces

General IoT and Machine-to-Machine (M2M) solutions
Smart Meters & Smart Sensors
Medical: eHealth & TeleHealth
Wireless Modules, Gateways
Industrial Control, Telemetry
Java ME 8 Example Use Cases
Enabling products and services across different market segments

Tools – Developing Efficiently
NetBeans +
device emulation
•  Java ME SDK
–  Tools and emulation for rapid development
of embedded Java ME applications
•  NetBeans & Eclipse Plug-ins
–  Integration with Java ME SDK
–  Full-featured, integrated development
environment for embedded
•  Unified Development Experience
–  Same development model across Java
ME, Java SE, and Java EE
Java ME SDK and IDEs
Free
Tools

Java ME
Connected Limited Device
Configuration (CLDC) 8
And
Generic Connection
Framework (GCF) 8

Java SE 8

•  Description
-  CLDC 8 is an long-anticipated, evolutionary update for CLDC 1.1.1 to bring
the VM, Java language and core API libraries in alignment with Java SE 8
•  Key Features
-  Synchronize Java SE 8 language features into Java ME
-  CLDC 8 is an extended strict subset of Java SE 8
-  Introduce developer-friendly Java SE APIs
-  Includes updated Generic Connection Framework (GCF) 8
-  Virtual Machine update to align with Java SE developer tools
-  Remain small and enable footprint optimizations
-  Backward binary compatible
CLDC 8 High-Level Overview
CLDC 8
Bringing The World of Java SE to Java ME

CLDC 8 architecture
CLDC 8
NIO files
NIO channels
Logging
Compact Configuration
NIO buffers java.lang java.io java.security java.util
GCF 8
Multicast
Secure
Datagram
Modem
Connection HTTP HTTPS Socket
Server
Socket
Datagram
Java VM

Configurations
The “CLDC
Configuration” is the
complete set of
CLDC APIs
Provides
maximum
functionality for
applications
Typical CLDC
platform footprint
is 1-2 MB ROM
The CLDC Compact
Configuration
defines a subset for
very small target
platforms
Omits Logging,
NIO Files, and
NIO Channels
Tailored for very
constrained
devices (512 K
ROM)
CLDC is scalable to small and very small devices

Optimizing Footprint Even Further
§ “Stripping On Deployment”
–  For fixed-function, minimal footprint deployments
–  Allows bundling application with CLDC 8 runtime and then stripping
away unnecessary components
–  Result: Minimal, non-modifiable binary containing application and
runtime

New Java Language Features
• private void setInterval(int interval) {
assert interval > 0 && interval <= 1000 :
"Invalid value?”;
}
Assertions
•  Added support for AbstractCollection, AbstractList, AbstractSet,
Collection, Collections, Enumeration, Iterator, List, ListIteratorGenerics
• void processList(Vector<String> list) {
for (String item : list) {
...
}
Enhanced for
Loop
• Hashtable<Integer, String> data = new Hashtable<>();
void add(int id, String value) {
data.put(id, value);
}
Autoboxing

• enum Season {WINTER, SPRING, SUMMER, FALL};
private Season season;
void setSeason(Season newSeason) {
season = newSeason;
Enumerations
• void warning(String format, String... parameters) {
for(String p : parameters) {
process(p);
}
}
Varargs
• import static data.Constants.RATIO;
...
double r = Math.cos(RATIO * theta);
Static imports
• SuppressWarnings, Deprecated, Override

@Deprecated
public void clear();
• (JLS 7 section 9.6.3.2 @Retention - SOURCE retentions policy only.)

Annotations

• switch (arg) {
case "-data": ...
case "-out": ...
Strings in switches
• long mask = 0xfff0_ff08_4fff_0fffl;
byte flags = 0b01001111;
Binary integral literals and
underscores in numeric literals
• catch (IOException | InterruptedException ex) {
logger.log(ex);
throw ex;
Multi-catch and more precise
rethrow
• Hashtable<String, String> map =
new Hashtable<>();
Improved Type Inference for Gen.
Instance Creation (diamond)
• try (DataInputStream is = new DataInputStream(...)){
return is.readDouble();
}
Try-with-resources statement

Library Updates
§  CLDC Library
–  Platform extensibility via Service Providers (ServiceLoader)
–  EventObject and EventListener
–  Subset of NIO Buffers
–  NIO Files and NIO Channels
–  Logging
–  StringBuilder and String Formatter
–  Comparable interface
–  Try with resources – Closeable and AutoCloseable

Library Updates
§  New Collections
–  List – ArrayList, LinkedList
–  Map – HashMap, LinkedHashMap, WeakHashMap
–  Set – HashSet, LinkedHashSet
–  Queue – Deque, ArrayDeque
–  Iterable and Iterator, ListIterator

Focus on: Service Providers
§  A service is a well-known set of interfaces and abstract classes
that is implemented by a (service) provider.
§  Providers can be installed to extend the Java platform.
§  Providers are located and instantiated on demand.
§  Providers are identified via a provider-configuration file in the
META-INF/services resource directory.
An extension mechanism for the Java platform

Service Providers - Example
import
com.XYZ.ServiceA;

ServiceLoader<ServiceA>
sl1=

ServiceLoader.load(ServiceA.class);

An extension mechanism for the Java platform
ServiceB
ServiceB
Provider1
ServiceB
Provider2
com.XYZ.ServiceA
ServiceA
Provider1
ServiceA
Provider3
ServiceA
Provider3
Resources:
META-INF/services/com.XYZ.ServiceA:
META-INF/services/ServiceB:
ServiceAProvider1
ServiceAProvider2
ServiceAProvider3
ServiceBProvider1
ServiceBProvider2

Updates to CLDC Virtual Machine
•  Target devices are not able to support InvokeDynamic
•  No support for reflection or retention of runtime annotations
CLDC 8 supports the Java VM Specification for SE 7 with some
limitations
•  For classfile versions 51 and 52
•  without a preverifier
Verification by Type Checking
•  For classfile versions 48 and older
Legacy Verification (Preverifier)

Unsupported Java SE 8 Features
§  No reflection
§  No serialization
§  No InvokeDynamic/Lambda expressions
§  No JNI and application native code
§  No User-defined class loaders
§  No runtime annotations
§  No thread groups and daemon threads
§  No concurrency utilities
§  Limited Math APIs (No BigDecimals)
§  Limited security APIs
§  Limited collection APIs (No sorted collection classes)

CLDC Summary
Language Alignment with SE 8
VM Alignment with SE 8
Library Alignment with SE 8
Compact Configuration for very small devices
GCF 8 to provides flexible networking
Developer leverage to tools, APIs and knowledge

Generic Connection Framework (GCF)
•  Consistent IPv6 support
•  Generic ConnectionOption mechanism to parameterize connections
•  Permissions apply per protocol
•  Extended failure information via exceptions from java.net
Consolidates GCF specification from CLDC, MIDP, CDC, and JSR 197
•  File support via StreamConnection
•  IP Multicast
•  Latest version of security protocols via TLS 1.2
•  Secure datagram connection via DTLS 1.2
•  Modem connection enhances CommConnection with control of hardware handshake
New and enhanced protocols

Generic Connection Framework (GCF)
CLDC
DatagramConnection
ContentConnection
InputConnection
OutputConnection
StreamConnection
CLDC 8
SecureServerConnection
SecureDatagramConnection
ModemConnection
UDPMulticastConnection
CommConnection
HttpConnection
HttpsConnection
SecureConnection
ServerSocketConnection
SocketConnection
UDPDatagramConnection

New GCF Features
•  GCF consistently supports IPv6 addresses
•  The value of the host field on Connector.open must be
a symbolic hostname, an IPv4 address or an IPv6
address surrounded by square brackets ('[', ']’).
•  datagram://[2001:db8::7]:4567
•  multicast://[FF0X::101]:4444
IPv6

New GCF Features
•  GCF includes support for UDP Multicast
•  1 to n communication of UDP datagrams
•  Multicast is important for distributed services:
Used for service announcement and discovery, media streaming
•  Dynamic Discovery for configuration and rendezvous (mDNS,
Bonjour)
•  The new protocol class UDPMulticastConnection enables
•  Client and server scenarios
•  Joining multicast groups
•  Creating a multicast server socket
UDP Multicast

New GCF Features
•  SecureConnection and SecureServerConnection
support TLS 1.2
•  SecureServerConnection provides the server-side of a TLS
connection
•  Both can be parameterized to:
•  Select a set of cipher suites
•  Select a minimum protocol version
•  Request client authentication
TLS protocol enhancements

New GCF Features
•  SecureDatagramConnection provides client-side support
for DTLS
•  It can be parameterized to:
•  Select a set of cipher suites
•  Select a minimum protocol version
•  Request client authentication
DTLS protocol support for TLS over UDP

New GCF Features
•  Utility functions for name lookup, reverse name lookup
and for testing the reachability of a host (ping):
• getCanonicalHostName(String host)
• isReachable(String host, int ttl, int timeout)
• getByName(String host)
NetworkUtilities

New GCF Features
•  Purpose: monitor and control the signal lines of a serial
interface
•  Getter and setter for the line mode (input/output)
•  Getter and setter for the line state
•  Listener for changes to the state of an input line
Modem Connection

New GCF Features
•  Type-safe mechanism for protocol-specific additional parameters
•  Useful for selecting access points, proxy settings, proprietary protocol
extensions
•  Multiple connection options can be used with varargs
ConnectionOptions
• ConnectionOption <String> keep = new ConnectionOption<>
("KeepAlive", "KEEP_ALIVE");
ConnectionOption <Integer> port = new
ConnectionOption<>("ProxyPort", 80);
Connection c = Connector.open(“my.server.com”, keep, port)
Example
Additional protocol parameters

New GCF Features: Access Point
§  The AccessPoint API enables:
–  Obtaining a list of available network access points
–  Querying the access technology (e.g. 3GPP, CDMA, Wi-Fi, Wired)
–  Getting Access-point technology-specific properties (e.g. 3GPP country
code, network code)
–  Selection of an access point for a connection
–  Detection of connect/disconnect situations
Selecting a Network Access Point

New GCF Features: Access Point
AccessPoint
aps[]
=
AccessPoint.getAccessPoints(true);

AccessPoint
ap
=
aps[0];

//
attach
an
event
listener
to
the
first
access
point

ap.addListener(new
AccessPointListener()
{

public
void
notifyEvent(AccessPoint
accessPoint,
int
eventType)
{

if
((eventType
==
AccessPointListener.EVENT_TYPE_AVAILABLE))

System.out.println(“signalstrength
=
”+
ap.getProperty(“signalstrength"));

}

});

//
select
the
first
access
point
for
communication

ConnectionOption<String>
id
=
new
ConnectionOption<>("AccessPoint”,
ap.getId());

Connection
c
=
Connector.open("http://www.oracle.com/index.html",
id);

Example

Development Tools for CLDC 8
§  Standard JDK 7 or 8 tools can be used for application development
§  Embedded-specific hints & warning messages
–  Provides developer with additional information to optimize code
§  Debug structures are optional
–  Debug features can be ignored/filtered out to save footprint
§  Future tools under consideration may include
–  Optimizing converter/compiler plugin for optimizing CLDC 8 applications
§  Integrated with Java ME SDK and IDEs

Java ME Embedded Profile
(MEEP) 8

MEEP 8 High-Level Overview
§ Description
–  MEEP is an evolution of JSR 228 (IMP-NG), defining a modernized Java
application platform with features and enhancements targeted at the
small- and mid-range embedded market
§ Key Features
–  Builds on CLDC 8
–  Robust and flexible multi-tasking application model
–  “Services-enabled” application platform supports modular software
design, deployment, and management
–  Enhanced and flexible security model
–  Improved configurability and optimized footprint for deployment
The Evolution of Java ME for Embedded

MEEP 8 Key Features and Benefits
A Modern Services-Enabled Software Platform for Embedded
Feature Benefit
Built on CLDC 8 Leverages CLDC 8 language features, APIs, and
permissions model to align with Java SE 8
API Optionality and
“Profile Sets”
Enables “right-sizing” of platform to optimize footprint and
reduce hardware requirements for specific target device
Software Provisioning and
Management
Supports remote deployment, management, and monitoring
of software components
Support for Software
Modularization
Enables modular software development and deployment,
reducing development effort, complexity, and footprint
Support for advanced
connectivity
Supports a wide range of connectivity options, both wired
and wireless, including advanced support for cellular
Enhanced security model Enables implementation of use case-specific security
policies for authentication and authorization

MEEP 8 Target Devices and Footprint
§ MEEP 8 is designed for “Right-Sizing”
–  Well-defined optionality and modularity allows matching software features
to deployment target footprint
–  “Stripping on Deployment” allows further reduction for very small fixed-
function targets
–  Greatly expands the range of addressable use cases and devices
§ Target Device Categories
–  Minimal Single-Function Device: Smallest possible footprint
–  Standard Multi-Function Device: Expands with functional requirements
–  Full Multi-Function Device: Full functionality, footprint not a concern
Adressing New Market Opportunities

MEEP 8: Right-Sizing The Platform
MEEP 8 Full
Profile Set
MEEP 8 Minimal Profile Set
•  Mandatory core APIs, application model,
application packaging
Target Devices/Use Cases
•  Very small devices (low cost/power/size)
•  Single-function use cases (e.g. smart
sensor)
Minimum:
•  128 kB RAM
•  1 MB Flash
Recommended:
•  256 kB RAM
•  2 MB Flash
MEEP 8 Standard Profile Set
•  Adds support for software services platform
(multi-tasking, application mgmt, shared libs,
events, enhanced security model, etc)
•  Optional Packages as per use case
•  Mid-range MCU/low-end embedded systems
•  Wide range of use cases (e.g. wireless
module, industrial control system, remote
monitoring device, smart network note, etc)
Minimum:
•  512 kB RAM
•  2 MB Flash
Recommended:
•  1 MB RAM
•  3 MB Flash
MEEP 8 Full Profile Set
•  All ME 8 functionality and Optional Packages
•  High-end MCU or mid-range embedded
systems
•  Use cases requiring full software functionality,
footprint not a concern
Minimum:
•  2 MB RAM
•  4 MB Flash
CLDC 8
Optional
Package
Optional
Package
Optional
Package
Application(s)
MEEP 8 Standard
Profile Set
MEEP 8 Minimal
Profile Set
Note:
IMP-NG
Compatible
Profile Set Not
Shown.
Recommended:
1 MB RAM,
2 MB Flash
Optional
JRSs
Optional
APIs
Note:
All footprint
numbers
approximate
and subject
to change

Application or Service
MEEP 8
MEEP 8 Architecture
CLDC
8

javax.
microedition.
midlet
New in MEEP 8
Updated in MEEP 8
javax.
microedition.
io
(optional)
javax.
microedition.
event
(optional)
javax.
microedition.
key
(optional)
javax.
microedition.
lui
(optional)
javax.
microedition.
media
(optional)
javax.
microedition.
power
(optional)
javax.
microedition.
rms
(optional)
javax.
microedition.
swm
(optional)
javax.
microedition.
cellular
(optional)

Package Description
javax.microedition.midlet The Application and the environment in which the application runs.
javax.microedition.swm [OPTIONAL] Provides extended software management features to MEEP.
javax.microedition.cellular [OPTIONAL] Provides classes to obtain information about cellular networks the
device is registered on.
javax.microedition.event [OPTIONAL] Events for system state changes and application to application
communication.
javax.microedition.power [OPTIONAL] Power management.
javax.microedition.io [OPTIONAL] Networking support based on the Generic Connection Framework
Specification.
javax.microedition.lui [OPTIONAL] Set of features to implement Line-oriented User Interface.
javax.microedition.key [OPTIONAL] Support of embedded device key input.
javax.microedition.media [OPTIONAL] Features for Audio support on embedded Devices.
javax.microedition.rms [OPTIONAL] Mechanism for applications to persistently store data and later retrieve it
MEEP 8 API Packages

MEEP 8 Application Platform
A modern platform to build flexible, modular, and managable software
Component/concept Description
Software provisioning Provision of applications and libraries, and
management of dependencies
Software management Control lifecycle of software components
Application concurrency (MVM) Concurrent execution of multiple apps, in isolation
Inter-application communication (IMC) Exchange data between applications (synchronous)
Events Send/receive events across system (asynchronous)
Service Provider/Consumer pattern Enable shared services and service consumers
Shared Libraries (LIBlets) Share common code across applications

MEEP 8 Application Provisioning & Management
Installation Mgmt
install/update/remove &
resolve dependencies
Lifecycle Mgmt
start/stop/terminate &
prioritize
Provisioning
download, authenticate,
verify
Security Policy Provider
security policy &
permissionsStorage
App-1
App
Mgmt
Agent
Application Management System (AMS)
Authentication Provider
authenticate
App-2
Java Runtime
Uses API
2. Download
3. Authenticate (2)
4. Install
6. Access
7. Provide
8. Control
9. Secure
5. Store
Application
Package
Deployment Infrastructure
•  Identity
•  Provisioning
•  Security Policy
•  Management
1. Implement protocol
App Management Agent:
•  Privileged application
•  Implements deployment-
specific protocol
•  Manages local
applications via AMS API
3. Authenticate (1)
Client Device

Shareable Software Components
§  A shareable software component that one or more applications MAY use
at runtime
§  Save static footprint size by enabling multiple application suites to share
the same common code without packaging them redundantly
§  Reduced download times for applications that declare dependencies on
shared components
§  Each shared library exposes a set of classes and resources to
applications for their use just as if those classes and resources were
originally packaged within the application JAR
§  Different implementations of the same API can be can be accessed via
the Service Provider/Consumer pattern
Shared Libraries (LIBlets)

Service Provider/Consumer Pattern
§  Service is a well known set of interfaces/abstract classes;
Service Provider is an implementation of the service
§  Enables consumers to use services by one or more providers
§  Features of the Application Platform Framework
–  Ability of apps, shared libraries, or runtime to declare it provides a service (provider)
–  Ability of apps or shared libraries declare a dependency on a service (consumer)
–  Ability of the AMS to bind a consumer to a provider, and rebind on updates
–  Service provider executed in context of consumer (client application)
§  Benefits
–  Modular software design, increased reuse, easier updating, reduced
testing, reduced footprint
Based on Java SE ServiceLoader API

MIDletSuite1
MIDletSuite2
How does it work?
Simple example, Service Provider and Consumer are two different apps
MIDlet 2
LIBlet 2
MIDlet 1

How does it work? (cont)
MIDletSuite1
MIDletSuite2
MIDlet 2
LIBlet 2
MIDlet 1
LIBlet2.jar/META-INF/services/com.example.CodecSet
LIBlet2.jar/META-INF/MANIFESTMIDletSuite1.jad
LIBlet-Services: com.example.CodecSet
…
MIDlet-Dependency-1: service; required; com.example.CodecSet
…
com.example.impl.StandardCodecs # Standard codecs

How does it work? (cont)
MIDletSuite1
MIDletSuite2
class StandardCodecs
class MIDlet1
MIDlet 2
LIBlet 2
MIDlet 1
public class StadardCodecs implements CodecSet {
public StadardCodecs() { … }
public Encoder getEncoder(String encodingName) {
return new EncoderImpl(…);
}
}
private static ServiceLoader<CodecSet> codecSetLoader
= ServiceLoader.load(CodecSet.class);
public static Encoder getEncoder(String encodingName) {
for (CodecSet cp : codecSetLoader) {
Encoder enc = cp.getEncoder(encodingName);
if (enc != null)
return enc;
}
return null;
}
Interface CodecSet
public interface CodecSet {
public Encoder getEncoder(String encodingName);
public Decoder getDecoder(String encodingName);
}

MEEP 8 Enhanced Security Model
§ “Clients” and Software Components
–  Clients are entities with particular security privileges (similar to users or
application vendors). Specialized clients are possible (e.g. “root client”).
–  Software components are associated with clients and inherit their
privileges
–  Authentication of clients and software components can be use case-
specific (e.g. specialized authentication scheme)
§ Security Privileges
–  Priviledges are based on clients and expressed as fine-grain permissions
–  Authorization (granting of permissions) can be use case-specific (e.g.
networked authorization services)
Flexibility to Support Specialized Security Scenarios

Device I/O API (DIO)

Device I/O API Overview
Java VM
Application
Layer
Application
Environment
CLDC
Example 1
Real-Time Clock Peripheral
Implementation
(High Level Driver)
Example 2
Simple GPIO Pin-
based sensor reader
(low level application)
On-Device I/O
Access Device I/O API
•  Generic API to access devices
in a platform-neutral manner
•  ‘Late binding’ allows addition
of new peripheral types without
changing API
•  Enables downstream support
of use case-specific
peripherals (non-real time)
•  No native application code
•  Also planned for availability on
Java SE
Access Peripheral I/O Hardware directly from Java applications

Device I/O API Features in ME 8
Peripheral Type Description
Peripheral abstraction interface All access to peripherals via PeripheralManager (late binding)
General Purpose Input/Output (GPIO) Access to buttons, switches, LEDs, etc.
Inter-Integrated Circuit Bus (I2C) Access to I2C slaves (sensors, RTC, DAC/ADC, NVRAM, …)
Serial Peripheral Interface Bus (SPI) Access to SPI slaves (audio devices, LCD screens, EEPROM/Flash, …)
Analog/Digital conversion Access to ADC and DAC channels
Universal Asynchronous Receiver/
Transmitter (UART)
Access to UART serial communication and control
Memory-Mapped Input/Output Access to devices with memory-mapped registers and memory blocks
AT Command Interface Access to modems and devices supporting AT commands
Watchdog Watchdog functionality to ensure reliable operation
Pulse counter Access to pulse counter functionality
Pulse Width Modulation (PWM) Access to pulse width modulation output

Conclusion
Call to Action

Conclusion
Aspect Benefit
Modern Embedded
Software Platform
•  Java SE alignment enables unified ecosystem for Java Embedded
expertise, reuse, and resources
•  Modular software system and enhanced manageability accelerates
time-to-market and extends product value at reduced cost/risk
•  Enhanced and more flexible security model allows deployment-
specific security infrastructure
Increased Market Reach •  Platform “right-sizing” allows to address wide range of use cases
and target markets with a single software model, from low-footprint
devices to more powerful systems
Open, based on
standards,
interoperable
•  Avoid vendor lock-in
•  Participate in and benefit from technology innovation
•  Integratable with many industry standards
Java ME 8: The Platform for the Internet of Things

Call To Action
•  Java ME Embedded 8 Early Access
Download it and try it out today!
-  oracle.com/technetwork/java/embedded/overview/javame/index.html
•  Learn more about Java ME 8
–  CLDC 8: jcp.org/en/jsr/detail?id=360
–  MEEP 8: jcp.org/en/jsr/detail?id=361
•  Follow me to keep abreast of Java Embedded
-  terrencebarr.wordpress.com
-  @terrencebarr

Safe Harbor Statement
The preceding is intended to outline our general product direction. It is intended
for information purposes only, and may not be incorporated into any contract.
It is not a commitment to deliver any material, code, or functionality, and should
not be relied upon in making purchasing decisions. The development, release,
and timing of any features or functionality described for Oracle s products
remains at the sole discretion of Oracle.

Java Micro Edition (ME) 8
Introduction
Terrence Barr
Senior Technologist & Product Manager
Oracle
Sep, 2013

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Introduction to Java Micro Edition (ME) 8

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