trait ControlException extends Throwable with NoStackTrace

A marker trait indicating that the Throwable it is mixed into is intended for flow control.

Note that Throwable subclasses which extend this trait may extend any other Throwable subclass (eg. RuntimeException) and are not required to extend Throwable directly.

Instances of Throwable subclasses marked in this way should not normally be caught. Where catch-all behaviour is required ControlExceptions should be propagated, for example,

 import scala.util.control.ControlException

try { // Body might throw arbitrarily } catch { case ce : ControlException => throw ce // propagate case t : Exception => log(t) // log and suppress

known subclasses: NonLocalReturnException


  1. NoStackTrace
  2. Throwable
  3. Serializable
  4. AnyRef
  5. Any

Value Members

  1. def equals(arg0: Any): Boolean

    This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence

    This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.

    The default implementations of this method is an equivalence relation:

    • It is reflexive: for any instance x of type Any, x.equals(x) should return true.
    • It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and only if y.equals(x) returns true.
    • It is transitive: for any instances x, y, and z of type AnyRef if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.

    If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is often necessary to override hashCode to ensure that objects that are "equal" (o1.equals(o2) returns true) hash to the same Int (o1.hashCode.equals(o2.hashCode)).


    the object to compare against this object for equality.


    true if the receiver object is equivalent to the argument; false otherwise.

    definition classes: AnyRef ⇐ Any
  2. def fillInStackTrace(): Throwable

  3. def getCause(): Throwable

  4. def getLocalizedMessage(): String

  5. def getMessage(): String

  6. def getStackTrace(): Array[StackTraceElement]

  7. def hashCode(): Int

    Returns a hash code value for the object

    Returns a hash code value for the object.

    The default hashing algorithm is platform dependent.

    Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

    definition classes: AnyRef ⇐ Any
  8. def initCause(arg0: Throwable): Throwable

  9. def printStackTrace(arg0: PrintWriter): Unit

  10. def printStackTrace(arg0: PrintStream): Unit

  11. def printStackTrace(): Unit

  12. def setStackTrace(arg0: Array[StackTraceElement]): Unit

  13. def toString(): String

    Returns a string representation of the object

    Returns a string representation of the object.

    The default representation is platform dependent.

    definition classes: Throwable ⇐ AnyRef ⇐ Any