将问题升级到Grails 2.4.4

Question

我从Grails 2.4.3升级到2.4.4后,在启动Grails应用程序时出现错误.完整的错误可以在这里阅读:http://pastebin.com/UXQ34JKD

2014-10-31 16:26:32 ERROR [context.GrailsContextLoaderListener] Error initializing the application: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: java.util.List
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: java.util.List
        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.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: java.util.List
        ... 4 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: java.util.List
        ... 4 more
Caused by: org.hibernate.MappingException: Association references unmapped class: java.util.List
        ... 4 more

它显示了一个 Association references unmapped class: java.util.List

它没有说明什么是域类或任何真正有用的信息.我已经尝试删除一些域类并试图找出原因是什么,但它是大型应用程序,但我没有成功.

任何人都可以指出我正确的方向,找出触发的位置以及如何解决它？

Answer 1

您还需要指定hasMany映射.似乎只添加List<DomainClassName> listName 你的Domain-Class就不够了

你还需要添加

static hasMany = [
        listName: DomainClassName
]

至少它对我有用.

Answer 2

找出问题所在

您需要做的第一件事是找出导致问题的字段.可能它将是声明为a 的域类中的任何字段List.

在我的情况下,很容易找到它们,因为该项目处于非常早期的阶段并且没有太多的域.

但是,我找到了一个可能的解决方案来缩小可能的罪魁祸首.

有趣的是:

什么糟透的是弄清楚它们在哪里的唯一好方法是在AbstractGrailsDomainBinder的第436行设置断点并查看事态

解决问题

当您找到不正确的字段时,是时候实施变通方法了.

让我们假设我们的罪魁祸首是List authors在域类中:

class Book {
   List<Integer> authors // keeps author ids
} 

当然,我们需要摆脱列表,所以解决方案将是这样的:

class Book {

    static transients = ['authors']

    String authorIds

    public void setAuthors(List<Integer> authorList) {
        this.authorIds = authorList ? authorList.join(";") : ''
    }

    public List<Integer> getAuthors() {
        return authorIds?.split(";")?.collect { it.toInteger() } ?: []
    }

} 

可能的副作用

我注意到需要明确调用setter 才能工作.

我很确定在之前的Grails版本中,以下代码将调用setter:

new Book(authors: [1, 2, 3])

但它看起来像在Grails 2.4.4中需要像下面这样完成:

def book = new Book()
book.setAuthors([1, 2, 3])