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How do you load a java class whose name is all caps? #3743

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neojin opened this issue Mar 17, 2016 · 3 comments
Closed

How do you load a java class whose name is all caps? #3743

neojin opened this issue Mar 17, 2016 · 3 comments
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Invalid or Duplicate

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@neojin
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neojin commented Mar 17, 2016

Environment

jruby-1.7.23, jruby-9.0.5.0

Expected Behavior

The java class is defined and available for use in jruby

Actual Behavior

Ex: java class loading properly (because it is camel cased):

irb(main):001:0> require 'java'
irb(main):002:0> require Rails.root.join 'lib', 'lwjgl.jar'

irb(main):003:0> org.lwjgl.openal.ALUtil
=> Java::OrgLwjglOpenal::ALUtil
irb(main):004:0> org.lwjgl.openal.ALUtil.checkALError()
# runs fine

Ex: java class with all caps:

jruby-1.7.23:

irb(main):006:0> org.lwjgl.glfw.GLFW
NameError: cannot link Java class org.lwjgl.glfw.GLFW (java.lang.NoClassDefFoundError: Could not initialize class org.lwjgl.glfw.GLFW)
    from org/jruby/javasupport/JavaUtilities.java:54:in `get_proxy_or_package_under_package'
    from file:/Users/jinlee/.rbenv/versions/jruby-1.7.23/lib/jruby.jar!/jruby/java/java_package_module_template.rb:14:in `method_missing'
    from (irb):6:in `evaluate'
    from org/jruby/RubyKernel.java:1079:in `eval'
    from org/jruby/RubyKernel.java:1479:in `loop'
    from org/jruby/RubyKernel.java:1242:in `catch'
    from org/jruby/RubyKernel.java:1242:in `catch'
    from /Users/jinlee/.rbenv/versions/jruby-1.7.23/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/console.rb:110:in `start'
    from /Users/jinlee/.rbenv/versions/jruby-1.7.23/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/console.rb:9:in `start'
    from /Users/jinlee/.rbenv/versions/jruby-1.7.23/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /Users/jinlee/.rbenv/versions/jruby-1.7.23/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Users/jinlee/.rbenv/versions/jruby-1.7.23/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands.rb:17:in `(root)'
    from org/jruby/RubyKernel.java:1040:in `require'
    from bin/rails:4:in `(root)'

jruby-9.0.5.0:

irb(main):004:0* org.lwjgl.glfw.GLFW
NameError: cannot link Java class org.lwjgl.glfw.GLFW (java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path)
    from org/jruby/javasupport/JavaUtilities.java:54:in `get_proxy_or_package_under_package'
    from uri:classloader:/jruby/java/java_package_module_template.rb:14:in `method_missing'
    from (irb):4:in `<eval>'
    from org/jruby/RubyKernel.java:976:in `eval'
    from org/jruby/RubyKernel.java:1287:in `loop'
    from org/jruby/RubyKernel.java:1096:in `catch'
    from org/jruby/RubyKernel.java:1096:in `catch'
    from /Users/jinlee/.rbenv/versions/jruby-9.0.5.0/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/console.rb:110:in `start'
    from /Users/jinlee/.rbenv/versions/jruby-9.0.5.0/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/console.rb:9:in `start'
    from /Users/jinlee/.rbenv/versions/jruby-9.0.5.0/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /Users/jinlee/.rbenv/versions/jruby-9.0.5.0/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Users/jinlee/.rbenv/versions/jruby-9.0.5.0/lib/ruby/gems/shared/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top>'
    from org/jruby/RubyKernel.java:937:in `require'
    from bin/rails:4:in `<top>'

The class in question:
http://javadoc.lwjgl.org/org/lwjgl/glfw/GLFW.html
@enebo
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enebo commented Mar 17, 2016

JRuby 9 might be telling you what is wrong in this error:

java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path

Have you set up -J-Djava.library.path=my_path_tolwjgl.so?

@neojin
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neojin commented Mar 17, 2016

Well, I'm an idiot. Thanks so much for this, and apologies for the extra noise.

To anyone else seeing this, I did the following:

export JAVA_OPTS="-Djava.library.path=/path/to/native/libraries/"
# run the program

@neojin neojin closed this as completed Mar 17, 2016
@kares kares added this to the Invalid or Duplicate milestone Mar 18, 2016
@enebo
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enebo commented Mar 18, 2016

@neojin no problem you are not the first to run into this and you won't be the last. java.library.path is a weird thing...

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