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trouble loading java class from jar #840

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homanchou opened this issue Jul 1, 2013 · 4 comments
Closed

trouble loading java class from jar #840

homanchou opened this issue Jul 1, 2013 · 4 comments
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application java integration
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Invalid or Duplicate

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@homanchou
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I'm having trouble wrapping the amazon-merchant-web-service-java-sdk in jruby.

The java sdk, jar and source, can be found at: https://developer.amazonservices.com/doc/bde/feeds/v20090901/java.html/182-0022359-5036344 (click the yellow download button in upper right)

I am able to instantiate some classes ....

require 'java'
require 'lib/MaWSJavaClientLibrary-1.1.jar'

module MWS
  include_package 'com.amazonaws.mws'
  include_package 'com.amazonaws.mws.model'
end

config = MWS::MarketplaceWebServiceConfig.new  #this works!!

... but not others

client = MWS::MarketplaceWebServiceClient.new  #this does NOT work!!!
NameError: MarketplaceWebServiceClient not found in packages com.amazonaws.mws, com.amazonaws.mws.model; last error: cannot load Java class com.amazonaws.mws.model.MarketplaceWebServiceClient
const_missing at file:/Users/...

Why is it not found?
@BanzaiMan
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It seems that MarketplaceWebServiceClient does not have a no-arg constructor.

If you try to use an existing one, you get a different error:

irb(main):006:0> MWS::MarketplaceWebServiceConfig.new
=> #<Java::ComAmazonawsMws::MarketplaceWebServiceConfig:0x5ab9f791>
irb(main):007:0> x=_
=> #<Java::ComAmazonawsMws::MarketplaceWebServiceConfig:0x5ab9f791>
irb(main):008:0> MWS::MarketplaceWebServiceClient.new('','','','',x)
NameError: MarketplaceWebServiceClient not found in packages com.amazonaws.mws; last error: cannot link Java class com.amazonaws.mws.MarketplaceWebServiceClient, probable missing dependency: org/apache/http/HttpEntity

You'll need to get the necessary apache libraries, load them, etc., and go from there.

I don't think this is a JRuby bug.

@BanzaiMan BanzaiMan reopened this Jul 1, 2013
@BanzaiMan
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Actually there is an opportunity to provide a better error message.

@homanchou
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Also, at first I thought the issue was related to MarketplaceWebServiceClient being an implementation of an interface, and by accident, I found I was able to instantiate the Java interface using MWS::MarketplaceWebService.new, which I shouldn't be able to do (but perhaps that is a topic for a different ticket?).

@enebo enebo modified the milestone: JRuby 9.0.0.0 Jul 14, 2015
@kares
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kares commented Aug 23, 2015

original issue is fine and the error message is improved, opened a new one for iface.new at #3275

@kares kares closed this as completed Aug 23, 2015
@kares kares added this to the Invalid or Duplicate milestone Aug 23, 2015
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@enebo @BanzaiMan @kares @homanchou