在尝试找出一些joda-time DateTime(时间戳格式化)问题的同时,我打开了一个REPL
scala -cp joda-time-2.3.jar
并忘记添加joda-convert jar,最终得到了一个
java.lang.AssertionError: assertion Failed: org.joda.convert.ToString
我能够将其简化为：
> scala -cp joda-time-2.3.jar Welcome to Scala version 2.11.0 (Java HotSpot(TM) 64-Bit Server VM,Java 1.8.0_05). Type in expressions to have them evaluated. Type :help for more information. scala> val dt = new org.joda.time.DateTime warning: Class org.joda.convert.FromString not found - continuing with a stub. warning: Class org.joda.convert.ToString not found - continuing with a stub. warning: Class org.joda.convert.FromString not found - continuing with a stub. warning: Class org.joda.convert.ToString not found - continuing with a stub. dt: org.joda.time.DateTime = 2014-05-14T17:54:24.511+01:00 scala> scala.runtime.ScalaRunTime.stringOf(dt) res0: String = 2014-05-14T17:54:24.511+01:00 scala> dt.toString java.lang.AssertionError: assertion Failed: org.joda.convert.ToString
ScalaRunTime.stringOf(dt)如何在dt.toString失败的地方成功？
解决方法
你没有发布堆栈跟踪,这是一个编译器崩溃,而不是joda失败的断言.
REPL正在崩溃编译表达式.
看起来AbstractDateTime有一个重载的toString方法,并且重载分辨率在通常的toString()上的@ToString注释上崩溃. (缺少ToString的符号.)
但是stringOf(x：Any)当然只是调用Object.toString().
显然有some known issues. recent issue修复了.
在2.10.4：
scala> (dt: Any).toString
res0: String = 2014-05-14T11:56:21.794-07:00
scala> dt.toString
<console>:9: error: ambiguous reference to overloaded definition,both method toString in class AbstractDateTime of type (x$1: String,x$2: java.util.Locale)String
and method toString in class AbstractDateTime of type (x$1: String)String
match expected type ?
dt.toString
^
scala> dt.toString() // crashes
2.10.3在加载DateTime时更加颠覆并声称错误,类文件被破坏.
崩溃发生在2.11.0.
