尝试使用Ruby Java Bridge（RJB）gem时出错“无法创建Java VM”
我正在尝试实现Ruby Java Bridge（RJB）gem以与JVM通信，以便我可以运行Open-NLP gem。 我已经在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是否会与此对话，所以我安装了32位JRE。 但是，错误是一样的。
是否有任何进一步的测试可以确保JVM在Ruby之外工作？
有人能告诉我运行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 `' from C:/Users/Richard/RubymineProjects/Utilities/fiddle_try.rb:1:in `' from -e:1:in `load' from -e:1:in `'
我找不到任何关于为什么它“无法创建Java VM”的其他信息。 如果我能获得更多信息，那将会非常有帮助。 我会很感激这些信息或修复此问题。 谢谢…
编辑增加有关RJB的开放式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 < OpenNLP::SomeClassName # Here, we specify another base class. OpenNLP.load_class('SomeOtherClass', 'opennlp.tools.namefind') # => OpenNLP::SomeOtherClass end
此时在代码中：
=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，我得到了创建JVM的相同错误。 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 `' C:/Users/Richard/RubymineProjects/Utilities/open_nlp_sample.rb:1:in `'
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：
%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。
在“无法创建Java VM”问题得到解决之后，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，因为他们的支持。