内部块的异常将被主 try-catch 捕获，但我需要引发它们

Question

当这段代码引发NotFoundException主块的异常时会引发，但我想引发NotFoundException，我该如何管理它？

try {
    if (x > y) {
        throw new NotFoundException("entity is not found");
    }
} catch (final Exception e) {
    throw new InternalServerErrorException(e);
}

Answer 1

try {
    if (x>y)
        throw new NotFoundException("entity is not found");
} catch (Exception e) {
    if (e instanceof NotFoundException) {
        throw e;
    } else {
        throw new InternalServerErrorException(e);
    }
}

或...

try {
    if (x>y)
        throw new NotFoundException("entity is not found");
} catch (NotFoundException e) {
    throw e;
} catch (Exception e) {
    throw new InternalServerErrorException(e);
}

Answer 2

这里的第一件事是您不需要 try catch 块。你可以只使用

if (x > y) {
    throw new NotFoundException("entity is not found");
}

显然，代码中的内部异常将在 try catch 块中捕获，因此您可以捕获一些更具体的异常，而不是在 catch 块中捕获 Exception。例如，如果一段代码预计会抛出 IOException，而不是捕获 Exception，您应该捕获 IOException

内部块的异常将被主 try-catch 捕获，但我需要引发它们

Exception of internal blocks will be catch by main try-catch but i need to raise them

java

nested-exceptions