Java / Exception
What is exception chaining in Java?
Exception chaining is the technique of handling exceptions by re-throwing a caught exception after wrapping it inside a new exception. This is very helpful in wrapping unchecked exceptions into a checked exception. The entire trace of errors is captured in the stacktrace of the exception.
The below constructors of Throwable class support chained exceptions in java :
Throwable(Throwable cause), cause is the exception that causes the current exception.
Throwable(String msg, Throwable cause), where msg is the exception message and cause is the exception that causes the current exception.
The below methods support chained exception.
getCause()method :- This method returns actual cause of an exception.
initCause(Throwable cause)method :- This method sets the cause for the calling exception.
The following example shows how to use a chained exception.
In this example, when an IOException is caught, a new AnotherWrappedSampleException exception is created with the original cause attached and the chain of exceptions is thrown up to the next higher level exception handler.
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