我正在使用Eclipse SCADA框架，它使用Nashorn将JavaScript集成到Java中 .

Nashorn的一个特性是您可以直接从JavaScript片段调用Java代码 .

我已经阅读了一些教程，为了调用你必须使用的java方法：

var MyJavaClass = Java.type('countdown2.test2');

但我得到以下 errors ：

!ENTRY org.eclipse.scada.vi.ui.draw2d 4 0 2018-05-09 15:45:08.572
!MESSAGE countdown2.test2 cannot be found by org.eclipse.scada.vi.ui.draw2d_0.3.0.v20160226-1536
!STACK 0
java.lang.RuntimeException: java.lang.ClassNotFoundException: countdown2.test2 cannot be found by org.eclipse.scada.vi.ui.draw2d_0.3.0.v20160226-1536
    at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:397)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:421)
    at jdk.nashorn.api.scripting.NashornScriptEngine.access$300(NashornScriptEngine.java:73)
    at jdk.nashorn.api.scripting.NashornScriptEngine$3.eval(NashornScriptEngine.java:514)
    at org.eclipse.scada.utils.script.ScriptExecutor.executeScript(ScriptExecutor.java:259)
    at org.eclipse.scada.utils.script.ScriptExecutor.access$1(ScriptExecutor.java:239)
    at org.eclipse.scada.utils.script.ScriptExecutor$3.call(ScriptExecutor.java:295)
    at org.eclipse.scada.utils.script.Scripts.executeWithClassLoader(Scripts.java:123)
    at org.eclipse.scada.utils.script.ScriptExecutor.execute(ScriptExecutor.java:290)
    at org.eclipse.scada.utils.script.ScriptExecutor.execute(ScriptExecutor.java:285)
    at org.eclipse.scada.vi.ui.draw2d.SymbolController.runUpdate(SymbolController.java:560)
    at org.eclipse.scada.vi.ui.draw2d.SymbolController.handleDataUpdate(SymbolController.java:550)
    at org.eclipse.scada.vi.ui.draw2d.SymbolController$2.run(SymbolController.java:503)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4155)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3772)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:694)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:606)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
    at ejemplo.Application.start(Application.java:20)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1488)
Caused by: java.lang.ClassNotFoundException: countdown2.test2 cannot be found by org.eclipse.scada.vi.ui.draw2d_0.3.0.v20160226-1536
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:439)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at jdk.nashorn.internal.runtime.Context.findClass(Context.java:1051)
    at jdk.nashorn.internal.objects.NativeJava.simpleType(NativeJava.java:498)
    at jdk.nashorn.internal.objects.NativeJava.type(NativeJava.java:322)
    at jdk.nashorn.internal.objects.NativeJava.type(NativeJava.java:314)
    at jdk.nashorn.internal.objects.NativeJava.type(NativeJava.java:310)
    at jdk.nashorn.internal.scripts.Script$Recompilation$23$1510$cilindrovertical.updateValve(cilindrovertical.js:46)
    at jdk.nashorn.internal.scripts.Script$2$onUpdate.:program(onUpdate:1)
    at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:637)
    at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)
    at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
    ... 38 more

难道我做错了什么？我正在 "cilindrovertical.js" 文件中编写JavaScript代码，我正在引用 "src" 文件中的 "test2" 类 . 我应该如何编写Java.type代码？

Eclipse Project Explorer

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提前感谢您的回答 .

javascript java eclipse nashorn scada