JAR and Packages

1
JAR and Packages

• Section 4.5 (JIAs)
• Section 3.3 (ALBINGs)
• Section 5.11 (ALBINGs)

2
Announcements

• Evaluations (6) Satisfied with course and me
• Course organization, PowerPoint lectures, (team
  work) project, deadline flexibility, in-class
  exercises, and posting assignments/projects
  online ahead of time
• Some requests
• More info on expectations for assignments and
  quizzes (will do)
• Project description not clear (intended)
• More time for reports (spread out evenly through
  the term) --- better time management
• Eliminated Back-office
• Divided revisiting design into two (4 5)
• 17 days for phase 3 Prototype
• 27 days for phase 6 Revisit Prototype (add
  Contracts, Invariants, Test Classes, Packages
  JAR)
• 15 days for phase 7 Complete System (with UI,
  refactoring, JDBC and Maintenance)
• All samples on N\CS230
• Talks reminder (MON WED)
• Appointments (tomorrow) to demo Projects

3
Self-Running JAR files

• To package an application
• place all files that your application needs into
  a JAR file
• add manifest entry that specifies the main class
  of your program
• A file containing the line Main-Class
  edu/csbsju/cs/Employee
• CAVEAT
• dont add .class to the main class name
• last line in manifest must end with a newline
  character
• jar cvfm Employee.jar mainclass.mf edu
• edu directory processed recursively
• jar cvfm JARTest.jar ManInf PackageTest. edu
• Users can now run the program as
• java jar Emloyee.jar
• Use jar xvf to show Manifest file

4
JARTest.jar

• jar cmfv ManInf JARTest.jar
• ManInf
• Main-Class PackageTest
• java -jar JARTest.jar

5
Exercise

• Go to N\CS230\Packages_JARs\PackageTest
• Create a package structure to match the package
  definition in Employee class (use your username
  instead of the string USERNAME) and update the
  package definition accordingly
• E.g. package edu.csbsju.cs.irahal
• Update class PackageTest to access the Employee
  class properly (dont use an import statement)
• Update class PackageTest to access the Employee
  class properly using an import statement
• Create a Self-Running JAR file that contains
  class PackageTest and the package
• When run, the JAR files should run class
  PackageTest
• Use command jar xvf JAR-FILE-NAME to extract the
  contents of the JAR file
• check the content of the file in the META-INF
  directory