Attachment 10730 Details for Bug 23158 – Summary of jruby tests including some code snippets, all at a very basic level.

Summary of jruby tests including some code snippets, all at a very basic level.

report.23158 (text/plain), 2.71 KB, created by Len Lawrence on 2019-02-04 16:35:24 CET

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Creator: Len Lawrence

Created: 2019-02-04 16:35:24 CET

Size: 2.71 KB

patch

obsolete

>mga6, x86_64
>
>$ jruby -v
>jruby 1.7.22 (1.9.3p551) 2017-05-17 fffffff on OpenJDK 64-Bit Server VM 1.8.0_191-b12 +jit [linux-amd64]
>
>The CVEs lead to descriptive reports and recommendations without any hints about reproducing the vulnerabilities.
>
>List of jruby tutorials at https://github.com/jruby/jruby/wiki/WalkthroughsAndTutorials
>
>The javaSwingHello.rb script can be run to display a minimal HelloWorld gui.
>$ jruby javaSwingHello.rb
>
>Find the code at http://rubylearning.com/satishtalim/jruby_tutorial.html
>Note that the jruby wiki and some other links on that page appear to be dead.
>
>There is a more extensive example of using Java::Swing at https://www.oracle.com/technetwork/articles/dsl/jruby-141877.html#cj
>See attachment: jruby_swing.rb.
>However, I could not get it to run:
>$ jruby jruby_swing.rb 
>ArgumentError: Java package `java.lang' does not have a method `boolean'
>  method_missing at file:/usr/lib/java/jruby/jruby-core.jar!/jruby/java/java_package_module_template.rb:13
>          (root) at jruby_swing.rb:10
>
>java does have a boolean type but apparently not implemented in jruby.
>
>Updated the packages.
>
>Same version of jruby but package is 1.7.22-5.1.
>
>Tutorial at https://www.techrepublic.com/article/jruby-an-introduction/
>Fails from the command-line interface, because the 'java' module requires the jruby framework.  Somewhere I saw 'jirb' being used instead of irb but have lost the link.
>
>https://www.roseindia.net/tutorials/jruby/ has some basic scripts of this sort:
>-------------------------------------------------------
># helloworld.rb
>require "java"
>
>message = "Hello World courtesy of jruby"
>stringdate = java.util.Date.new
>puts message
>puts "Date is #{stringdate}"
>-------------------------------------------------------
>
>$ jruby helloworld.rb
>Hello World courtesy of jruby
>Date is Mon Feb 04 10:25:27 GMT 2019
>
>-------------------------------------------------------
># arraylist.rb
># Very contrived example
>require "java"
>
>names = %w[ Suzy Caroline Amanda Lucy ]
>java_import "java.util.ArrayList"
>
>blackbook = ArrayList.new
>names.each { |name| blackbook.add name }
>puts blackbook
>-------------------------------------------------------
>
>$ jruby arraylist.rb
>[Suzy, Caroline, Amanda, Lucy]
>
>File reading...
>-------------------------------------------------------
># filereader.rb
>
>require "java"
>
>java_import "java.io.BufferedReader"
>java_import "java.io.FileReader"
>
>filename = ARGV[0] || Dir.home+"/.bashrc"
>
>filereader = FileReader.new filename
>buffer = BufferedReader.new filereader
>line = buffer.readLine
>
>while line
>  puts line
>  line = buffer.readLine
>end
>-------------------------------------------------------
>
>Usage: jruby filereader.rb sometextfile
>       or
>       jruby filereader.rb
>
>
>Godd to go on the strength of this.
>
>

mga6, x86_64

$ jruby -v
jruby 1.7.22 (1.9.3p551) 2017-05-17 fffffff on OpenJDK 64-Bit Server VM 1.8.0_191-b12 +jit [linux-amd64]

The CVEs lead to descriptive reports and recommendations without any hints about reproducing the vulnerabilities.

List of jruby tutorials at https://github.com/jruby/jruby/wiki/WalkthroughsAndTutorials

The javaSwingHello.rb script can be run to display a minimal HelloWorld gui.
$ jruby javaSwingHello.rb

Find the code at http://rubylearning.com/satishtalim/jruby_tutorial.html
Note that the jruby wiki and some other links on that page appear to be dead.

There is a more extensive example of using Java::Swing at https://www.oracle.com/technetwork/articles/dsl/jruby-141877.html#cj
See attachment: jruby_swing.rb.
However, I could not get it to run:
$ jruby jruby_swing.rb 
ArgumentError: Java package `java.lang' does not have a method `boolean'
  method_missing at file:/usr/lib/java/jruby/jruby-core.jar!/jruby/java/java_package_module_template.rb:13
          (root) at jruby_swing.rb:10

java does have a boolean type but apparently not implemented in jruby.

Updated the packages.

Same version of jruby but package is 1.7.22-5.1.

Tutorial at https://www.techrepublic.com/article/jruby-an-introduction/
Fails from the command-line interface, because the 'java' module requires the jruby framework.  Somewhere I saw 'jirb' being used instead of irb but have lost the link.

https://www.roseindia.net/tutorials/jruby/ has some basic scripts of this sort:
-------------------------------------------------------
# helloworld.rb
require "java"

message = "Hello World courtesy of jruby"
stringdate = java.util.Date.new
puts message
puts "Date is #{stringdate}"
-------------------------------------------------------

$ jruby helloworld.rb
Hello World courtesy of jruby
Date is Mon Feb 04 10:25:27 GMT 2019

-------------------------------------------------------
# arraylist.rb
# Very contrived example
require "java"

names = %w[ Suzy Caroline Amanda Lucy ]
java_import "java.util.ArrayList"

blackbook = ArrayList.new
names.each { |name| blackbook.add name }
puts blackbook
-------------------------------------------------------

$ jruby arraylist.rb
[Suzy, Caroline, Amanda, Lucy]

File reading...
-------------------------------------------------------
# filereader.rb

require "java"

java_import "java.io.BufferedReader"
java_import "java.io.FileReader"

filename = ARGV[0] || Dir.home+"/.bashrc"

filereader = FileReader.new filename
buffer = BufferedReader.new filereader
line = buffer.readLine

while line
  puts line
  line = buffer.readLine
end
-------------------------------------------------------

Usage: jruby filereader.rb sometextfile
       or
       jruby filereader.rb


Godd to go on the strength of this.

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Attachments on bug 23158: 10727 | 10729 | 10730