Question

我试图通过JRuby公开我写给Java应用程序的ruby gem的功能。我有一个问题，让jruby加载bson-1.8.5-java gem而不是本地扩展bson_ext，这对JRuby不起作用。我的目标是对我的ruby gem进行最小的更改，所以我不想在我的ruby代码中导入Java类。

将我的ruby文件编译为Java类后，他们正在调用require 'mongo'

public class Goose extends RubyObject  {
    private static final Ruby __ruby__ = Ruby.getGlobalRuntime();
private static final RubyClass __metaclass__;

    static {
        String source = new StringBuilder("require 'mongo'\n" +
            "\n" +
            "class Goose\n" +
            "  def initialize\n" +
        ...
    __ruby__.executeScript(source, "goose.rb");
        ...

从Java调用该类失败，抱怨没有加载BSON扩展。

问题可以归结为

根据this tutorial，我把mongo和bson-java宝石搞得一团糟。

$ jruby -S gem install -i ./my-gems mongo --no-rdoc --no-ri
Fetching: bson-1.8.5-java.gem (100%)
Fetching: mongo-1.8.5.gem (100%)
Successfully installed bson-1.8.5-java
Successfully installed mongo-1.8.5
2 gems installed
$ jar cf my-gems.jar -C ./my-gems .

我将my-gems.jar添加到Eclipse项目类路径中。

然后我运行了一个简单的主程序来测试需求评估

public static void main(String[] args) {
    System.setProperty("org.jruby.embed.compat.version", "JRuby1.9");
    ScriptEngineManager factory = new ScriptEngineManager();

    ScriptEngine engine = factory.getEngineByName("jruby");

    try {
        engine.eval("require 'mongo'");
    } catch (ScriptException e) {
        e.printStackTrace();
    }
}

哪个输出

      ** Notice: The BSON extension was not loaded. **

  For optimal performance, use of the BSON extension is recommended. To
  enable the extension make sure ENV['BSON_EXT_DISABLED'] is not set.

  Exception in thread "main" java.lang.ExceptionInInitializerError at JavaRubyTest.main(JavaRubyTest.java:27)
  Caused by: org.jruby.exceptions.RaiseException: (NameError) cannot load Java class org.bson.types.ObjectId
...

但是，如果我从jirb运行require 'mongo'，则会加载。

任何指针？

如何从JRuby生成的Java类中使用Mongo？

0 个答案: