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GroovyScriptEngine无法加载正在运行的groovy脚本的导入

[英]GroovyScriptEngine fails to load imports of running groovy script

背景 :

我最近开始玩Groovy,并试图将groovy脚本引擎嵌入eclipse插件中,以使我的客户在基于eclipse的产品中开发自己的GUI扩展。 这与codehaus网站上发布的成功故事非常相似。

问题

尝试加载groovy类(“ SwtGuiBuilder”)时,由GroovyScriptEngine从eclipse插件运行的groovy脚本(我们称其为“ main_eclipse.groovy”),具有以下错误:

BUG! 在已经迭代的同时排队新资源。 排队的源是“文件:/home/nicolas/workspace/groovy-test/src/gui/SwtGuiBuilder.groovy”

有人遇到过同样的问题吗? 如何解决? 任何帮助将不胜感激!

一些观察:

  • 当使用groovy解释器而不是GroovyScriptEngine java对象时,使用我的SwtGuiBuilder类没有问题(请参见下面的脚本“ main_groovy”)。

  • 我的问题似乎不是类路径问题,因为在抛出的异常中提到了包含Sw​​tGuiBuilder类的文件。

  • 在两个报告的常规错误GRECLIPSE-429和GRECLIPSE-1037中提到了错误消息。 我没有完全了解技术细节,但是这些错误似乎与加载许多类时的性能问题有关,这与我的情况无关。

细节

SampleView.java

public class SampleView
{
public SampleView() { super(); }

public void createPartControl(Composite parent) 
{
    String    groovyScript = null;
    String [] groovyPath   = null;

    boolean shall_exit = false;
    do
    {      // ask user for params
        GroovyLocationDialog groovyLocationDialog= new GroovyLocationDialog(parent.getShell() );
        int return_code = groovyLocationDialog.open();
        if ( return_code != Window.OK )
            shall_exit = true;
        else 
        {
            groovyScript= groovyLocationDialog.getInputScriptName();
            groovyPath  = groovyLocationDialog.getInputScriptPath();

            // run it
            ScriptConnector scriptConnector = new ScriptConnector(parent);
            try                 { scriptConnector.runGuiComponentScript( groovyPath, groovyScript); }
            catch (Exception e) { e.printStackTrace(); }
            System.out.println("script finished");
        }
    }
    while ( ! shall_exit );
}

ScriptConnector.java

public class ScriptConnector
{
    private String[]  roots;
    private Composite window;
    private Binding   binding;

    public ScriptConnector( Composite window )
    {
         this.window    = window;
         Binding  scriptenv = new Binding();    // A new Binding is created ...
         scriptenv.setVariable("SDE", this); 
         scriptenv.setVariable("WINDOW", this.window); // ref to current window

         this.binding = scriptenv;
    }

    public void runGuiComponentScript(final String[] groovyPath, final String scriptName) 
    {
        GroovyScriptEngine gse = null;
        this.roots     = groovyPath;
        try 
        {
            // instanciating the script engine with current classpath
            gse = new GroovyScriptEngine( roots, this.getClass().getClassLoader() );
            gse.run(scriptName, binding);      // ... and run specified script
        }
        catch (Exception e) { e.printStackTrace(); }
        catch (Throwable t) { t.printStackTrace(); }
    }
}

main_eclipse.groovy

package launcher;

import org.eclipse.swt.SWT
import org.eclipse.swt.widgets.*
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.RowLayout as Layout

// This import will fail...
import gui.SwtGuiBuilder;


WINDOW.layout = new Layout(SWT.VERTICAL);
def builder = new SwtGuiBuilder(WINDOW);
builder.Label ( style=SWT.NONE, text = 'Simple demo of Groovy and SWT')
builder.Button( style=SWT.PUSH, text = 'Click me' , action = { println "Click !" } )

SwtGuiBuilder.groovy

package gui;

import org.eclipse.swt.events.*
import org.eclipse.swt.widgets.Button
import org.eclipse.swt.widgets.Composite
import org.eclipse.swt.widgets.Label


class SwtGuiBuilder
{
    private Composite _parent

    public SwtGuiBuilder(Composite parent) { _parent = parent }

    public void Button( style = SWT.PUSH, text= null, action = null )
    {
        def btn = new Button(_parent, style)
        if ( text != null )
            btn.text = text
        if (action != null)
            btn.addSelectionListener( new SelectionAdapter() { void widgetSelected( SelectionEvent event ) { action(); } } );
    }

    public void Label( style = SWT.NONE, text = '' )
    {
        def lbl = new Label(_parent, style)
        lbl.text = text
    }
}

main_groovy.groovy

package launcher;

import org.eclipse.swt.SWT
import org.eclipse.swt.widgets.*
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.RowLayout as Layout

// ... But this import is handled properly !
import gui.SwtGuiBuilder;

def display = new Display()
def WINDOW = new Shell(display)
WINDOW.text = 'Groovy / SWT Test';

WINDOW.layout = new Layout(SWT.VERTICAL);
def builder = new SwtGuiBuilder(WINDOW);
builder.Label ( style=SWT.NONE, text = 'Simple demo of Groovy and SWT')
builder.Button( style=SWT.PUSH, text = 'Click me' , action = { println "Ya clicked me !" } )

WINDOW.pack();
WINDOW.open();

while (!WINDOW.disposed) {
    if (!WINDOW.display.readAndDispatch())
        WINDOW.display.sleep();
}

堆栈跟踪

BUG! 在已经迭代的同时排队新资源。 排队的源是org.codehaus.groovy.control.CompilationUnit.addSource(CompilationUnit.java:460)的``file:/home/nicolas/workspace/groovy-test/src/gui/SwtGuiBuilder.groovy'' groovy.util.GroovyScriptEngine $ ScriptClassLoader $ 3.findClassNode(GroovyScriptEngine.java:195)的org.codehaus.groovy.control.ClassNodeResolver.resolveName(ClassNodeResolver.java:124)的.control.CompilationUnit.addSource(CompilationUnit.java:433)在org.codehaus.groovy.control.ResolveVisitor.resolveToOuter(ResolveVisitor.java:863)在org.codehaus.groovy.control.ResolveVisitor.resolve(ResolveVisitor.java:377)在org.codehaus.groovy.control.ResolveVisitor.visitClass (ResolveVisitor.java:1407)在org.codehaus.groovy.control.ResolveVisitor.startResolving(ResolveVisitor.java:202)在org.codehaus.groovy.control.CompilationUnit $ 1.call(CompilationUnit.java:713)在org.codehaus org.codehaus.groovy.control.CompilationUnit.doPha上的.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:1015) groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:279)上org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:596)上的seOperation(CompilationUnit.java:647)在groovy.lang.GroovyClassLoader.parseClass上(GroovyClassLoader.java:258)在groovy.util.GroovyScriptEngine $ ScriptClassLoader.doParseClass(GroovyScriptEngine.java:247)在groovy.util.GroovyScriptEngine $ ScriptClassLoader.parseClass(GroovyScriptEngine.java:229)在groovy.lang.GroovyClass在groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:202)处在Groovy.util.GroovyScriptEngine.loadScriptByName(GroovyScriptEngine.java:514)在groovy.util.GroovyScriptEngine.Engine Script(Groovy )在groovy.util.GroovyScriptEngine.run(GroovyScriptEngine.java:551)

我的配置:

  • Linux Ubuntu 14.04 x86

  • Groovy版本:2.3.2

  • 的JVM:1.7.0_55

  • Eclipse Kepler SR2-内部版本20140224-0627

  • Eclipse Groovy插件v2.0.7

我没有使用GroovyShell类(下面的Groovy代码,但是很容易更改回Java),而是使用GroovyShell类,CompilerConfiguration允许您指定类路径。

    def config = new CompilerConfiguration(classpath: classpath)
    def binding = new Binding()

    def result = new GroovyShell(binding, config).evaluate("""
def foo='bar'
""")

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