Java 升级到Grails2.0后的NPE

我刚刚升级到Grails2.0，在运行应用程序时看到下面的错误。 它表示一行上的NPE，该行

return fileSpec;

我在互联网上搜索了一段时间，我发现一些人在各种插件方面有问题，但不是特别是这个NPE问题。使用组件扫描器加载我的SpringBean似乎有点问题，但我不明白为什么它不再工作了。在Grails1.3.7->2.0升级之前，一切进展顺利

如果有任何Grails或Spring3.1大师能为我指明正确的方向，我将不胜感激。谢谢

以下是错误：

=============== DEBUG MESSAGE: unimplemented bytecode ================
| Error 2012-01-17 21:21:42,273 [Thread-10] ERROR context.GrailsContextLoader  - Error executing bootstraps: Error creating bean with name 'fileSpec': Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public myproject.spec.FileSpec myproject.spec.MyFileSpecGenerator.createFileSpec()] threw exception; nested exception is java.lang.NullPointerException
Message: Error creating bean with name 'fileSpec': Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public myproject.spec.FileSpec myproject.spec.MyFileSpecGenerator.createFileSpec()] threw exception; nested exception is java.lang.NullPointerException
   Line | Method
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   138 | run      in java.util.concurrent.FutureTask
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run      in     ''
^   680 | run . .  in java.lang.Thread
Caused by BeanDefinitionStoreException: Factory method [public myproject.spec.FileSpec myproject.spec.MyFileSpecGenerator.createFileSpec()] threw exception; nested exception is java.lang.NullPointerException
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   138 | run      in java.util.concurrent.FutureTask
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run      in     ''
^   680 | run . .  in java.lang.Thread
Caused by NullPointerException: null
->> 2027 | createFileSpec in myproject.spec.MyFileSpecGenerator
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   303 | innerRun in java.util.concurrent.FutureTask$Sync
|   138 | run . .  in java.util.concurrent.FutureTask
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread

可能相关：myresources.groovy

beans = {
    fileSpec(fileSpecGenerator:"createFileSpec")
}

---

您的工厂方法正在将NPE抛出公共myproject.spec.FileSpec myproject.spec.MyFileSpecGenerator.createFileSpec（）。你有什么？你试过做“grails清理”吗？Aravind a：就像我说的，只是：返回fileSpec；Manish：是的，grails清理、刷新依赖项、重新启动STS。问题仍然存在。我还对fileSpecGenerator.createFileSpec（）运行了一个单元测试。很好。这是一个非常简单的方法。没有依赖关系。不返回null。我认为NPE来自fileSpecGenerator，而不是组件扫描中的bean。不知道为什么。