我已经使用 EMF Ecore 定义了一个自定义元模型，现在我正在编写一个 acceleo 项目来生成正确的 java 代码。
Acceleo 对于某些用例来说还不够，主要是在模型中搜索特定元素并为某些元素保存额外信息，因此我需要调用自定义 Java 服务，我按照分步示例进行操作，我相信我确切地知道如何编写查询来调用 Java 服务。
问题是，当我使用 Java 原始参数调用服务时，它运行顺利，但是当我使用元模型类型编写服务时，会出现以下错误:
org.eclipse.acceleo.engine.AcceleoEvaluationException: argument type mismatch
at org.eclipse.acceleo.engine.internal.environment.AcceleoLibraryOperationVisitor.invoke(AcceleoLibraryOperationVisitor.java:1001)
at org.eclipse.acceleo.engine.internal.environment.AcceleoLibraryOperationVisitor.callNonStandardOperation(AcceleoLibraryOperationVisitor.java:130)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitOperationCallExp(AcceleoEvaluationVisitor.java:1213)
at org.eclipse.ocl.ecore.impl.OperationCallExpImpl.accept(OperationCallExpImpl.java:390)
at org.eclipse.ocl.AbstractEvaluationVisitor.visitExpression(AbstractEvaluationVisitor.java:248)
at org.eclipse.ocl.EvaluationVisitorDecorator.visitExpression(EvaluationVisitorDecorator.java:156)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1885)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoQueryInvocation(AcceleoEvaluationVisitor.java:873)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1862)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoIfBlock(AcceleoEvaluationVisitor.java:617)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1823)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoTemplate(AcceleoEvaluationVisitor.java:914)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1817)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoTemplateInvocation(AcceleoEvaluationVisitor.java:965)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1856)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoIfBlock(AcceleoEvaluationVisitor.java:587)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1823)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoForBlock(AcceleoEvaluationVisitor.java:537)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1833)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoTemplate(AcceleoEvaluationVisitor.java:914)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1817)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoTemplateInvocation(AcceleoEvaluationVisitor.java:965)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1856)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoIfBlock(AcceleoEvaluationVisitor.java:587)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1823)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoFileBlock(AcceleoEvaluationVisitor.java:424)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1846)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoTemplate(AcceleoEvaluationVisitor.java:914)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1817)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoTemplateInvocation(AcceleoEvaluationVisitor.java:965)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1856)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitAcceleoTemplate(AcceleoEvaluationVisitor.java:914)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.switchExpression(AcceleoEvaluationVisitor.java:1817)
at org.eclipse.acceleo.engine.internal.evaluation.AcceleoEvaluationVisitor.visitExpression(AcceleoEvaluationVisitor.java:1042)
at org.eclipse.ocl.internal.evaluation.QueryImpl.evaluate(QueryImpl.java:152)
at org.eclipse.ocl.ecore.QueryImpl.evaluate(QueryImpl.java:62)
at org.eclipse.acceleo.engine.generation.AcceleoEngine.doEvaluate(AcceleoEngine.java:361)
at org.eclipse.acceleo.engine.generation.AcceleoEngine.evaluate(AcceleoEngine.java:142)
at org.eclipse.acceleo.engine.service.AcceleoService.doGenerateTemplate(AcceleoService.java:869)
at org.eclipse.acceleo.engine.service.AcceleoService.doGenerate(AcceleoService.java:585)
at org.eclipse.acceleo.engine.service.AbstractAcceleoGenerator.generate(AbstractAcceleoGenerator.java:193)
at org.eclipse.acceleo.engine.service.AbstractAcceleoGenerator.doGenerate(AbstractAcceleoGenerator.java:158)
at com.muazothman.mobile.metamodel.android_converter.Main.doGenerate(Main.java:203)
at org.eclipse.acceleo.ide.ui.launching.strategy.AcceleoLaunchOperation.run(AcceleoLaunchOperation.java:149)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2326)
at org.eclipse.acceleo.ide.ui.launching.strategy.AcceleoPluginLaunchingStrategy.launch(AcceleoPluginLaunchingStrategy.java:239)
at org.eclipse.acceleo.ide.ui.launching.strategy.AcceleoPluginLaunchingStrategy.launch(AcceleoPluginLaunchingStrategy.java:141)
at org.eclipse.acceleo.internal.ide.ui.launching.AcceleoLaunchDelegate.launch(AcceleoLaunchDelegate.java:51)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:855)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:704)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1047)
at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1251)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.acceleo.engine.internal.environment.AcceleoLibraryOperationVisitor.invoke(AcceleoLibraryOperationVisitor.java:993)
... 66 more
谁知道出了什么问题吗？
这是java代码:
public void f(CustomAction c){
}
这是 mtl 代码
[query public f(arg0 : CustomAction) : OclVoid
= invoke('converter.services.ActivityServices', 'f(metamodel.CustomAction)', Sequence{arg0.oclAsType(CustomAction)}) /]
最佳答案
您的服务实际上位于包converter.services中，并且生成的类CustomAction实际上位于包“metamodel”中吗？
顺便说一句，你应该打电话
[query public f(arg0 : CustomAction) : OclVoid
= invoke('converter.services.ActivityServices', 'f(metamodel.CustomAction)', Sequence{arg0}) /]
无需将其显式转换为 CustomAction，因为它是这样声明的。
关于无法使用Acceleo调用Java服务，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18189639/