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运行应用程序时出现以下错误，编译期间没有问题。请帮助，如何解决这个问题。

ERROR [localhost-startStop-1] 2014-09-26 19:19:19,050 org.codehaus.groovy.grails.web.context.GrailsContextLoaderListener.error(213) : Error initializing the application: Error creating bean with name 'flowBuilderServices': Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'org.springframework.expression.spel.standard.SpelExpressionParser' to required type 'org.springframework.binding.expression.ExpressionParser' for property 'expressionParser'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [org.springframework.expression.spel.standard.SpelExpressionParser] to required type [org.springframework.binding.expression.ExpressionParser] for property 'expressionParser': no matching editors or conversion strategy found
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowBuilderServices': Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'org.springframework.expression.spel.standard.SpelExpressionParser' to required type 'org.springframework.binding.expression.ExpressionParser' for property 'expressionParser'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [org.springframework.expression.spel.standard.SpelExpressionParser] to required type [org.springframework.binding.expression.ExpressionParser] for property 'expressionParser': no matching editors or conversion strategy found
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'org.springframework.expression.spel.standard.SpelExpressionParser' to required type 'org.springframework.binding.expression.ExpressionParser' for property 'expressionParser'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [org.springframework.expression.spel.standard.SpelExpressionParser] to required type [org.springframework.binding.expression.ExpressionParser] for property 'expressionParser': no matching editors or conversion strategy found
    ... 4 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type [org.springframework.expression.spel.standard.SpelExpressionParser] to required type [org.springframework.binding.expression.ExpressionParser] for property 'expressionParser': no matching editors or conversion strategy found
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1 回答 1

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你用的是什么插件？我在升级到 Grails 2.4.3 时遇到了同样的异常，只是将其范围缩小（这并不容易），因为 Grails WebFlow 插件和 ACL 插件都设置了一个名为 expressionParser 的 bean，但每个插件都使用不同的类...一个在 Grails 初始化 Spring bean 期间覆盖另一个。通过在 WebFlowPluginSupport.groovy 文件中将 Web 流插件的 expressionParser 重命名为 flowExpressionParser，我能够绕过这个异常。你可以在你的插件目录中搜索'expressionParser'，看看你是否有>1个插件在使用它。

我已经让 webflow 插件的人知道了，这里还有更多细节。 https://jira.grails.org/browse/GPWEBFLOW-109

于 2014-10-16T13:07:22.913 回答