升级到 Grails 2.4.4 的问题

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

它没有说明什么域类或任何真正有用的信息。我尝试删除一些域类并试图找出原因，但它是大型应用程序，我没有成功。

谁能指出正确的方向，以找出触发此问题的位置以及如何修复它？

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。可能是任何领域在域类中声明为List.

就我而言，很容易找到它们，因为该项目处于非常早期的阶段，并且没有太多的领域。

然而，我发现了一个可能的解决方案 http://grails.1312388.n4.nabble.com/Fork-mode-not-including-resources-tp4658130p4658138.html以缩小可能的罪魁祸首范围。

有趣的部分是：

糟糕的是找出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务状态

解决问题

当您发现不正确的字段时，就该实施解决方法了。

假设我们的罪魁祸首是List authors在域类中，例如：

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

当然，我们需要删除该列表，因此解决方案如下：

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

我注意到需要调用设置器明确地上班。

我非常确定在以前的 Grails 版本中，以下代码将调用 setter：

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

但看起来在 Grails 2.4.4 中需要这样做：

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