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How to handle the exception using UncaughtExceptionHandler in Java?
The UncaughtExceptionHandler is an interface inside a Thread class. When the main thread is about to terminate due to an uncaught exception the java virtual machine will invoke the thread’s UncaughtExceptionHandler for a chance to perform some error handling like logging the exception to a file or uploading the log to the server before it gets killed. We can set a Default Exception Handler which will be called for the all unhandled exceptions. It is introduced in Java 5 Version.
This Handler can be set by using the below static method of java.lang.Thread class.
public static void setDefaultUncaughtExceptionHandler(Thread.UncaughtExceptionHandler ueh)
We have to provide an implementation of the interface Thread.UncaughtExceptionHandler, which has only one method.
Syntax
@FunctionalInterface
public interface UncaughtExceptionHandler {
void uncaughtException(Thread t, Throwable e);
}Example
public class UncaughtExceptionHandlerTest {
public static void main(String[] args) throws Exception {
Thread.setDefaultUncaughtExceptionHandler(new MyHandler());
throw new Exception("Test Exception");
}
private static final class MyHandler implements Thread.UncaughtExceptionHandler {
@Override
public void uncaughtException(Thread t, Throwable e) {
System.out.println("The Exception Caught: " + e);
}
}
}Output
The Exception Caught: java.lang.Exception: Test Exception
Updated on: 30-Jul-2019
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