Sun Certified MAD

Published on May 12, 2007

I am a Sun Certified Mobile Application Developer. Indeed. I took the exam and passed in December 06. Here are some notes that I had before the exam.

JTWI 1.0 specification

Mandatory:

  • CLDC 1.0 (NOT 1.1)
  • MIDP 2.0
  • WMA 1.1

Note: NO MMAPI 1.1 etc…

Jar file requires:

  • JAR size
  • JAD size
  • RMS size
  • “MIDlet-Data-Size”

Standard size:

  • Jar : 64 KB
  • JAD : 5 KB
  • RMS : 30 KB
  • Heap : 256 KB

Screen:

  • 125x125 with 12 bit color

Requires:

  • SMS Push

CLDC 1.1

  • Min. Volatile memory = 32 KB
  • Does not support: Finalization, JNI and user defined class loader etc…
  • Support: Threads, float, Weak references etc…
  • Derived collection classes from J2SE: Vector, Stack, Hashtable, Enumeration etc..
  • NO ArrayList, Queue etc..

Preverification Process

Will do:

  • Arrange all subroutines in order
  • Augment stackmap
  • Removes certain bytecodes

WMA 1.1

Provide Message Interface:

  • Address
  • Timestamp

JAD FIle

  • Takes precedence over JAR manifest
  • Microedtion-Configuration: <cldc></cldc>
  • Eg. MIDlet-Data-Size: 8888
    • 8888 bytes of RMS space will permanently be reserved for the application.

Connection

  • StreamConnectionNotifier
    • Wait for a StreamConnection to be established
    • Extends Connection
  • Default mode is READ_WRITE

MIDP 2.0

Required protocols

  • Http 1.1 (NOT 1.0)
  • Https

Encoding

  • UTF-8 is NOT the default encoding scheme

RMS

  • Can be shared among multiple MIDlets
  • Use AUTHMODE_ANY to share

Others

  • 5 independent RecordStore
  • 5 simultaneous Timer

High level UI

  • ChoiceGroup has no IMPLICIT type

Security

  • MIDlets in minimum security domain are not prompted for every permission.
  • In JAD, specify “Midlet-permissions” and Midlet Suite must be granted the protection domain with the permission, else it will NOT be installed.
  • In JAD, specify “Midlet-permissions-opt” if the permission in the protect domain is optional. It can be installed if the permission is not avail to the Midlet.
  • X.509 PKI Authentication.

MMAPI

  • 5 states : UNREALIZED, REALIZED, PREFETCHED, STARTED, CLOSED

SMS

  • 160/70 characters depends on encoding
TAGGED WITH
j2me