如何在RCP应用程序中嵌入Clojure

问题描述

我目前使用javascript来添加脚本到Eclipse RCP应用程序，但我更喜欢能够使用Clojure。但是，我遇到了类路径的困难，因为虽然Eclipse可以找到Clojure类，但Clojure本身不能。

I am currently using javascript to add scripting to an Eclipse RCP application, but I would prefer to be able to use Clojure. However, I have run into classpath difficulties because while Eclipse can find the Clojure classes, Clojure itself can't.

插件激活器的启动方法：

The plugin activator's start method:

public void start(BundleContext context) throws Exception {
    super.start(context);
    plugin = this ;
    Class.forName("clojure.lang.RT") ;
    JSController.startup() ;
}

不会引发类未找到异常 clojure.lang.RT ，但针对位于同一位置的 clojure / core__init 。

doesn't raise a class not found exception for clojure.lang.RT, but for clojure/core__init which is in the same place.

java.io.FileNotFoundException: Could not locate clojure/core__init.class or clojure/core.clj on classpath:
        at clojure.lang.RT.load(RT.java:402)
        at clojure.lang.RT.load(RT.java:371)
        at clojure.lang.RT.doInit(RT.java:406)
        at clojure.lang.RT.<clinit>(RT.java:292)

RCP应用程序基于Eclipse版本3.1

The RCP application is based on Eclipse version 3.1

有人知道如何解决这个问题吗？

Does anyone know how to fix this?

推荐答案

我想：我假设当激活bundle / plugin，线程的类加载器将是加载插件的那个。

It was much simpler than I thought: I had assumed that when activating the bundle / plugin, the thread's classloader would be the one that loaded the plugin. It's not, it's the application classloader.

因此，解决方案很简单：

So the solution is simple:

Runnable cljRunner = new Runnable(){
    public void run(){
        Thread thisThread = Thread.currentThread() ;
        ClassLoader savedCL = thisThread.getContextClassLoader() ;
        thisThread.setContextClassLoader(Activator.class.getClassLoader()) ;
        try {
            clojure.lang.Compiler.load(
                new java.io.StringReader(
                        "(require 'clojure.main)\n" +
                        "(require 'swank.swank)\n"  +
                        "(clojure.main/with-bindings\n" +
                        "    (swank.swank/start-server \"nul\" :encoding \"utf-8\" :port 9999))"
                )) ;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        thisThread.setContextClassLoader(savedCL) ;
    }
} ;
cljThread = new Thread(cljRunner) ;
cljThread.start() ;

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