尝试使用Ruby Java Bridge（RJB）gem时出错“无法创建Java VM”

Question

我正在尝试实现Ruby Java Bridge（RJB）gem以与JVM对话，以便我可以运行Open-NLP gem。我在Windows 8上安装并运行了Java。至少我所知道的所有迹象都表明Java已经安装并且可以正常运行。但是，使用RJB的尝试失败并显示消息“无法创建Java VM”。 （在其他情况下，我有时会为“小提琴：模块”获得“未定义的方法`dlopen”，这也是难以辨认的。）

我最初只是默认安装了JDK。由于我的64位系统，这安装​​了64位Java。我不确定Ruby和RJB是否会与之对话，所以我安装了32位JRE。但是，错误是一样的。

我是否可以运行以确保JVM在Ruby之外工作？

有人可以告诉我运行Windows / Ruby / RJB / JVM可能需要做些什么吗？

谢谢...

我使用BitNami Rubystack和Ruby 1.9.3p448运行Windows 8。

根据testjava.jsp，Java似乎可用：

这是代码，包括我找到它的URL：

class FiddleTry

# http://devjete.wordpress.com/2011/01/31/installing-rjb-1-3-4-on-windows-7-32bit-wo-vc/
  require 'rjb'
  out = Rjb::import('java.lang.System').out  <== Line 5 is here
  out.print('Hello Rjb from ')
  p out._classname
end

以下是错误消息：

C:/Users/Richard/RubymineProjects/Utilities/fiddle_try.rb:5:in `import': can't create Java VM (RuntimeError)
    from C:/Users/Richard/RubymineProjects/Utilities/fiddle_try.rb:5:in `<class:FiddleTry>'
    from C:/Users/Richard/RubymineProjects/Utilities/fiddle_try.rb:1:in `<top (required)>'
    from -e:1:in `load'
    from -e:1:in `<main>'

我找不到任何关于“无法创建Java VM”的原因的其他信息。如果我能获得更多信息，那将会非常有用。我会很感激这些信息或修复此问题。谢谢......

编辑增加关于RJB的开放 - NLP要求的信息......

这是我试图运行的代码，取自Github / Open-nlp：

class OpenNlpSample
  ENV['JAVA_HOME'] = "C:/Program Files/Java/jdk1.7.0_25" if ENV['JAVA_HOME'].nil?
  ENV['LD_LIBRARY_PATH'] = "C:/Program Files/Java/jdk1.7.0_25/bin; C:/Program Files (x86)/Java/jre7" if ENV['LD_LIBRARY_PATH'].nil?
  # Load the module
  require 'open-nlp'
  gem_bin = File.join(Gem.loaded_specs['open-nlp'].full_gem_path, 'bin/')
# Set an alternative path to look for the JAR files.
# Default is gem's bin folder.
# OpenNLP.jar_path = '/path_to_jars/'
# OpenNLP.jar_path = File.expand_path('../../ruby/lib/ruby/gems/1.9.1/gems/open-nlp-0.1.4/bin',__FILE__)
  OpenNLP.jar_path = gem_bin
# Set an alternative path to look for the model files.
# Default is gem's bin folder.
# OpenNLP.model_path = '/path_to_models/'
  OpenNLP.model_path = gem_bin
# Pass some alternative arguments to the Java VM.
# Default is ['-Xms512M', '-Xmx1024M'].
# OpenNLP.jvm_args = ['-option1', '-option2']
  OpenNLP.jvm_args = ['-Xms512M', '-Xmx1024M']
# Redirect VM output to log.txt
  OpenNLP.log_file = 'log.txt'
# Set default models for a language.
# OpenNLP.use :language
  OpenNLP.use :english

=begin
  Examples

  Simple tokenizer
=end

  OpenNLP.load

  sent = "The death of the poet was kept from his poems."
  tokenizer = OpenNLP::SimpleTokenizer.new

  tokens = tokenizer.tokenize(sent).to_a
# => %w[The death of the poet was kept from his poems .]


  #Maximum entropy tokenizer, chunker and POS tagger

  OpenNLP.load

  chunker   = OpenNLP::ChunkerME.new
  tokenizer = OpenNLP::TokenizerME.new
  tagger    = OpenNLP::POSTaggerME.new

  sent   = "The death of the poet was kept from his poems."

  tokens = tokenizer.tokenize(sent).to_a
# => %w[The death of the poet was kept from his poems .]

  tags   = tagger.tag(tokens).to_a
# => %w[DT NN IN DT NN VBD VBN IN PRP$ NNS .]

  chunks = chunker.chunk(tokens, tags).to_a
# => %w[B-NP I-NP B-PP B-NP I-NP B-VP I-VP B-PP B-NP I-NP O]


  #Abstract Bottom-Up Parser

  OpenNLP.load

  sent      = "The death of the poet was kept from his poems."
  parser = OpenNLP::Parser.new
  parse = parser.parse(sent)

  parse.get_text.should eql sent

  parse.get_span.get_start.should eql 0
  parse.get_span.get_end.should eql 46
  parse.get_child_count.should eql 1

  child = parse.get_children[0]

  child.text # => "The death of the poet was kept from his poems."
  child.get_child_count # => 3
  child.get_head_index #=> 5
  child.get_type # => "S"


  #Maximum Entropy Name Finder*

                           OpenNLP.load

  text = File.read('./spec/sample.txt').gsub!("\n", "")

  tokenizer   = OpenNLP::TokenizerME.new
  segmenter   = OpenNLP::SentenceDetectorME.new
  ner_models  = ['person', 'time', 'money']

  ner_finders = ner_models.map do |model|
    OpenNLP::NameFinderME.new("en-ner-#{model}.bin")
  end

  sentences = segmenter.sent_detect(text)
  named_entities = []

  sentences.each do |sentence|

    tokens = tokenizer.tokenize(sentence)

    ner_models.each_with_index do |model,i|
      finder = ner_finders[i]
      name_spans = finder.find(tokens)
      name_spans.each do |name_span|
        start = name_span.get_start
        stop  = name_span.get_end-1
        slice = tokens[start..stop].to_a
        named_entities << [slice, model]
      end
    end

  end


=begin
  Loading specific models

  Just pass the name of the model file to the constructor. The gem will search for the file in the OpenNLP.model_path folder.
=end

                                                                                                                          OpenNLP.load

  tokenizer = OpenNLP::TokenizerME.new('en-token.bin')
  tagger = OpenNLP::POSTaggerME.new('en-pos-perceptron.bin')
  name_finder = OpenNLP::NameFinderME.new('en-ner-person.bin')
# etc.


  #Loading specific classes

  #You may want to load specific classes from the OpenNLP library that are not loaded by default. The gem provides an API to do this:

# Default base class is opennlp.tools.
      OpenNLP.load_class('SomeClassName')
# => OpenNLP::SomeClassName

# Here, we specify another base class.
  OpenNLP.load_class('SomeOtherClass', 'opennlp.tools.namefind')
# => OpenNLP::SomeOtherClass



  end

代码中的这一点：

=begin
  Examples

  Simple tokenizer
=end

  OpenNLP.load

调用链是dl.rb，fiddle.rb和jar_loader.rb。 jarloader.rb起始行43：

# Load Rjb and create Java VM.
def self.init_rjb
  ::Rjb::load(nil, self.jvm_args)
  set_java_logging if self.log_file
end

此时，我在创建JVM时遇到了同样的错误。所以，我还是试图运行RJB。错误链如下：

Fast Debugger (ruby-debug-ide 0.4.17, ruby-debug-base19x 0.11.30.pre12) listens on 127.0.0.1:59488
Uncaught exception: can't create Java VM
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/jar_loader.rb:45:in `load'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/jar_loader.rb:45:in `init_rjb'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/jar_loader.rb:38:in `load_jar_rjb'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/jar_loader.rb:27:in `load'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/binding.rb:63:in `load_jar'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/binding.rb:71:in `block in load_default_jars'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/binding.rb:68:in `each'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/binding.rb:68:in `load_default_jars'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/bind-it-0.2.7/lib/bind-it/binding.rb:55:in `bind'
    D:/BitNami/rubystack-1.9.3-12/ruby/lib/ruby/gems/1.9.1/gems/open-nlp-0.1.4/lib/open-nlp.rb:14:in `load'
    C:/Users/Richard/RubymineProjects/Utilities/open_nlp_sample.rb:32:in `<class:OpenNlpSample>'
    C:/Users/Richard/RubymineProjects/Utilities/open_nlp_sample.rb:1:in `<top (required)>'

Answer 1

首先，我需要卸载Java x64并安装JDK x586以获得32位支持。

然后，按如下方式设置JAVA_HOME：

JAVA_HOME=C:\Program Files (x86)\Java\jdk1.7.0_40

并将JAVA_HOME添加到我的路径中：

%JAVA_HOME%\bin;C:\Program Files (x86)\Java\jre7\bin;

这解决了“无法创建Java VM”的问题。

设置$DEBUG=false或注释掉该行，消除了所有其他消息。 $DEBUG模式显示可能被捕获和解决的错误消息，以便可以忽略它们。

解决了“无法创建Java VM”问题后，所有其他错误消息都属于这种类型，因此是虚假的。

JetBrains对Rubymine的支持为我解决了这个问题。他们非常好，特别是Serge，我推荐他们的产品是因为他们的支持。