grails - 贝壳和瓶盖

Question

尝试在grails console中运行以下命令:

Family.where() {password =~ "%qw%"}

对存储对象的非常简单的查询。我回来了:

    ERROR groovy.lang.MissingMethodException:
No signature of method: com.babyboom.Family.where() is applicable for argument types: (groovysh_evaluate$_run_closure1) values: [groovysh_evaluate$_run_closure1@34356294]
Possible solutions: where(groovy.lang.Closure), merge(), every(), grep(), merge(com.babyboom.Family), merge(java.util.Map)

我知道我创建的关闭与预期的不同。
几个问题:

为什么有两种类型的闭包？

找到Why am I getting a "No signature of method"" error when running the closure recursion example in the Groovy shell?尝试了一下，但没有帮助，仍然出现相同的错误

使用grails控制台时效果很好

Answer 1

这可能是带有grails shell 的classloader错误。要重现，请向BuildConfig.gradle添加依赖项:

runtime "org.grails:grails-datastore-simple:3.1.2.RELEASE"

然后跑

import org.grails.datastore.mapping.simple.SimpleMapDatastore
import org.grails.datastore.gorm.GormStaticApi
class Bar {}

class Foo extends GormStaticApi<Bar> {
    Foo() {
        super(Bar, new SimpleMapDatastore(), [], null)
    }
}

def f = new Foo()

在grails控制台中，产量:

Result: Foo@699c0395

在grails壳产量:

groovy:000> def f = new Foo()
ERROR java.lang.LinkageError:
loader constraint violation: when resolving overridden method "Foo.$getStaticMetaClass()Lgroovy/lang/MetaClass;" the class loader (instance of groovy/lang/GroovyClassLoader$InnerLoader) of the current class, Foo, and its superclass loader (instance of org/codehaus/groovy/grails/cli/support/GrailsRootLoader), have different Class objects for the type ()Lgroovy/lang/MetaClass; used in the signature