我是 Java 世界的新手，但熟悉 Ruby。我正在尝试编写一个与某些第三方 jar 文件交互的程序。

虽然如果从 Java 调用这些库似乎表现良好，但当我在 JRuby 中调用它们时，它们的行为不正确。这是一个问题，因为我真的很想使用 JRuby。例如，下面的两个程序试图做完全相同的事情，但它们产生不同的输出:

此 Java 程序运行正常。

我在 Netbeans 中开发了下面的 Java 程序，然后按 F6(运行主项目)运行它。项目的库文件夹设置为“C:\Program Files (x86)\Microchip\MPLABX\mplab_ide\lib\nblibraries.properties”。当我运行它时，它会打印“pins: 17”。

package pinbug1;    
import com.microchip.mplab.mdbcore.assemblies.Assembly;
import com.microchip.mplab.mdbcore.assemblies.AssemblyFactory;
import com.microchip.mplab.mdbcore.simulator.PinSet;
import com.microchip.mplab.mdbcore.simulator.Simulator;
import org.openide.util.Lookup;

public class PinBug1
{
    public static void main(String[] args)
    {
        AssemblyFactory assemblyFactory = Lookup.getDefault().lookup(AssemblyFactory.class);
        Assembly assembly = assemblyFactory.Create("PIC18F14K50");

        Simulator simulator = assembly.getLookup().lookup(Simulator.class);
        int num = simulator.getDataStore().getProcessor().getPinSet().getNumPins();
        System.out.println("pins: " + num);   // prints "pins: 17"
    }

}

["mplab_ide/mdbcore/modules/*.jar",
 "mplab_ide/mplablibs/modules/*.jar",
 "mplab_ide/mplablibs/modules/ext/*.jar",
 "mplab_ide/platform/lib/org-openide-util*.jar",
 "mplab_ide/mdbcore/modules/ext/org-openide-filesystems.jar"
].each do |pattern|
  Dir.glob("C:/Program Files (x86)/Microchip/MPLABX/" + pattern).each do |x|
    require x
  end
end

assemblyFactory = org.openide.util.Lookup.getDefault.lookup(com.microchip.mplab.mdbcore.assemblies.AssemblyFactory.java_class)
assembly = assemblyFactory.create("PIC18F14K50")
simulator = assembly.getLookup.lookup(com.microchip.mplab.mdbcore.simulator.Simulator.java_class)
num = simulator.getDataStore.getProcessor.getPinSet.getNumPins
puts "pins: #{num}"    # => pins: 0

com.microchip.mplab.libs.MPLABDocumentLocator.MPLABDocumentLocator.java_class.resource("MPLABDocumentLocator.class").getFile()

file:C:/Program Files (x86)/Microchip/MPLABX/mplab_ide/mplablibs/modules/com-mi crochip-mplab-libs-MPLABDocumentLocator.jar!/com/microchip/mplab/libs/MPLABDocum entLocator/MPLABDocumentLocator.class

file:C:%5CProgram%20Files%20(x86)%5CMicrochip%5CMPLABX%5Cmplab_ide%5Cmplablibs% 5Cmodules%5Ccom-microchip-mplab-libs-MPLABDocumentLocator.jar!/com/microchip/mpl ab/libs/MPLABDocumentLocator/MPLABDocumentLocator.class"

require 'java'
$CLASSPATH << jar_filename
require jar_filename

最佳答案

我能够使用此实现获得预期的结果。此植入的主要区别在于将 jar 添加到类路径中。如果您评论此行( $CLASSPATH << jar_file )，您将获得 0 个引脚。 (问题底部的解释)

require 'java'

Dir.glob("C:/MyCustomLibraries/MATLAB/*.jar").each do |jar_file| #Has all MPLab jars except org.netbeans.*
  $CLASSPATH << jar_file
  require jar_file
end

module Mplab
  include_package "org.openide.util" #Lookup
  include_package "com.microchip.mplab.mdbcore.simulator" #PinSet, Simulator
  include_package "com.microchip.mplab.mdbcore.assemblies" #Assembly, AssemblyFactory
end

assembly_factory = Mplab::Lookup.getDefault.lookup(Mplab::AssemblyFactory.java_class)
assembly = assembly_factory.create("PIC18F14K50")
simulator = assembly.getLookup.lookup(Mplab::Simulator.java_class)
num = simulator.getDataStore.getProcessor.getPinSet.getNumPins
puts "pins: #{num}" 

content/mplab/mplab.deviceSupport

content/mplab/MPHeader.xml

content/mplab/PluginBoardSupport.xml

pins: 17

关于java - 是什么导致 Java 库在被 JRuby 调用时表现不同？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15794170/