Question

一个恰当的例子：

java.lang.ExceptionInInitializerError
    at sun.misc.Unsafe.ensureClassInitialized(Native Method)
    at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
    at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:142)
    at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1088)
    at java.lang.reflect.Field.getFieldAccessor(Field.java:1069)
    at java.lang.reflect.Field.get(Field.java:393)
    at utest.runner.BaseRunner.runUTestTask(BaseRunner.scala:30)
    at utest.runner.BaseRunner$$anonfun$utest$runner$BaseRunner$$makeTask$1.apply(BaseRunner.scala:95)
    at utest.runner.BaseRunner$$anonfun$utest$runner$BaseRunner$$makeTask$1.apply(BaseRunner.scala:95)
    at utest.runner.Task.executeInternal(Task.scala:48)
    at utest.runner.Task.execute(Task.scala:19)
    at sbt.TestRunner.runTest$1(TestFramework.scala:76)
    at sbt.TestRunner.run(TestFramework.scala:85)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202)
    at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:185)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202)
    at sbt.TestFunction.apply(TestFramework.scala:207)

Here is the source location that bumps into that exception以下是该行的副本：

val suite = TestUtils.loadModule(name, testClassLoader).asInstanceOf[TestSuite]

我明天将调试utest以跟踪这个特殊情况，这必须是一个边缘情况，因为它只发生在我的一个启用utest的项目中（可能与目录路径和包对齐有关）。

但是你可以建议一种好的形式的防御性编程来避免这种反射错误，这样代码可以在调用asInstanceOf之前捕获错误条件，或者替代地，捕获块的惯用代码 - 以更可行的方式传达强制失败的原因？

Scala防御性编码围绕asInstanceOf强制

0 个答案: