Performance overhead for exception handling

Executing a catch code block and throwing an exception is expensive, and the performance loss in this process is mainly due to a snapshot of the line stacks when creating an exception.

Throws an exception first to create a new object The constructor of the Throwable class calls a method named Fillinstacktrace, the Fillinstacktrace method examines the stack and collects the call trace information.

Since a new object was created during processing, the JVM would have to adjust the call stack as long as an exception was thrown, and the system resource overhead would be increased.

Performance overhead for exception handling