retryCallbacks.java

    private class SuccessCallback implements RetryCallback<Boolean, RuntimeException> {
        @Override
        public Boolean doWithRetry(RetryContext context) throws RuntimeException {
            System.out.println("Success callback: attempt " + context.getRetryCount());
            return true;
        }
    }

    private class ExceptionCallback implements RetryCallback<Boolean, Exception> {
        @Override
        public Boolean doWithRetry(RetryContext context) throws Exception {
            System.out.println("Exception callback: attempt " + context.getRetryCount());
            throw new Exception("Test Exception");
        }
    }

    private class SpecificExceptionCallback implements RetryCallback<Boolean, IOException> {
        @Override
        public Boolean doWithRetry(RetryContext context) throws IOException {
            System.out.println("IO Exception callback: attempt " + context.getRetryCount());
            throw new IOException("Test IO Exception");
        }
    }

    private class LoggingRecoveryCallback implements RecoveryCallback<Boolean> {
        @Override
        public Boolean recover(RetryContext context) throws Exception {
            System.out.println("Attempts exhausted. Total: " + context.getRetryCount());
            System.out.println("Last exception: " + Optional.ofNullable(context.getLastThrowable())
                    .orElse(new Throwable("No exception thrown")).getMessage());
            System.out.println("\n");
            return false;
        }
    }