GStringImpl无法强制转换为java.lang.String [英] GStringImpl cannot be cast to java.lang.String

问题描述

在使用Grails和Spring Security时出现以下错误.还有其他人有这样的问题吗?如果是这样，您的解决办法是什么?

I got the error below using Grails and Spring Security. Has anyone else had a problem like this? If so, what was your fix?

Error |
Exception in thread "Thread-15" 
Error |
java.lang.ClassCastException: org.codehaus.groovy.runtime.GStringImpl cannot be cast to java.lang.String
Error |
    at org.codehaus.groovy.grails.project.compiler.GrailsProjectWatcher.run(GrailsProjectWatcher.java:114)

还有

java.lang.IllegalArgumentException: Failed to evaluate expression 'User_name'

推荐答案

您是否生成了所有类(用户，角色...). 您的命令看起来如何? 像这样的grails s2-quickstart com.testapp User Role? 检查您的配置，然后像本教程中那样尝试. Spring安全插件教程

Did you generate all the classes (User, Role ...). How does your command looks like? Like this grails s2-quickstart com.testapp User Role? Check your configuration and try it like in this tutorial. Spring Security Plugin Tutorials

实际上，此错误意味着在常规情况下，您使用诸如"$ {my_var}"之类的GString，并且某些类期望使用String.无法自动投射.如果您有类似这样的代码，则必须将其转换为这样的字符串:"${my_var}".toString().

Actually this error means in groovy that you use a GString like "${my_var}" and some class expects String. It can't be cast automatically. If you have some code like this, you have to convert it to String like this: "${my_var}".toString().

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