class ScreenDetailsPage(parameters: PageParameters) extends BasePage(parameters) {
@SpringBean(name = "screenDAO") protected var screenDao: DAO[Screen] = null
assertNotNull(screenDao)
我发现没有填充@SpringBean.如果screenDao是val或var,protected或private,则没有区别.
查找树我发现Component的构造函数(间接)代表其子类初始化@SpringBeans,但是对null的赋值是uninitializing它.但Scala要求分配.
我该如何防止这种行为？
解决方法:
尝试
class ScreenDetailsPage(parameters: PageParameters) extends BasePage(parameters) {
@SpringBean(name = "screenDAO") protected var screenDao: DAO[Screen] = _
assertNotNull(screenDao)
我没有尝试过,但我也在考虑启动Wicket / Scala项目,并看到了this blog entry,这在其他方面也可能有用.
该博客引用的相关部分是
In addition, note that the field is assigned to an underscore (_), which tells the Scala compile to NOT initialize, but leave it at the default state (null in this case). This is required for the injection to work. If you assign it to null explicitly, you
will overwrite the Spring bean as the injection will occur before the constructor of MyPage is executed.
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