为什么我会收到下面的 "Unhandled exception"？[重复]

Question

这个问题在这里已经有了答案:

Java 8：如何在流中使用异常抛出方法？ (7个回答)

封闭 2个月前.

public int deleteMultipleEntries(String[] idArray) throws Exception {
    int result = dao.deleteMultipleEntries(idArray);
    cache.invalidateAll(Arrays.stream(idArray).collect(Collectors.toList()));
    if (result != idArray.length) {
        Arrays.stream(idArray).forEach(s -> {
            try {
                cache.get(s);// this method throws ExecutionException if entry with id s not found
                log.error("id:" + s + " was not deleted");
                log.info("Deleting entry id:"+Integer.valueOf(s));
                dao.deleteEntry(Integer.valueOf(s));//getting unhandled exception: java.lang.Exception error in IDE
            } catch (ExecutionException e) {
                log.info("id:" + s + " is deleted or it never existed");
            }
        });
    }
    return result;
} 
public int deleteEntry(Integer primaryKey) {
            String deleteSql = String.format(getDeleteSql(), primaryKey);
            if (log.isDebugEnabled())
                log.debug("Deleting Entry with Key: {}", primaryKey);

            int affectedRows = getJdbcTemplate().update(deleteSql);
            if (log.isDebugEnabled())
                log.debug("Updated {} Rows", affectedRows);

            return affectedRows;
        }

在这句话时出现错误 dao.deleteEntry(Integer.valueOf(s))。

如果执行过程中出现异常 dao.deleteEntry(Integer.valueOf(s))。 捕获块不能捕获异常，因为它是专门捕获""ExecutionException "的，因此函数本身应该自动抛出异常，因为它的签名有throws语句。我写的try catch块是用来处理逻辑处理的，如果我在try catch之外写同样的语句，它不会给出任何错误。我想了解这里的行为，请帮助我。

Answer 1

那是因为你是在 Arrays.stream(idArray).forEach(...)把这个改成普通的foreach就可以了。

public int deleteMultipleEntries(String[] idArray) throws Exception {
    int result = dao.deleteMultipleEntries(idArray);
    cache.invalidateAll(Arrays.stream(idArray).collect(Collectors.toList()));
    if (result != idArray.length) {
        for(String s: idArray) {
            try {
                cache.get(s);// this method throws ExecutionException if entry with id s not found
                log.error("id:" + s + " was not deleted");
                log.info("Deleting entry id:"+Integer.valueOf(s));
                dao.deleteEntry(Integer.valueOf(s));//getting unhandled exception: java.lang.Exception error in IDE
            } catch (ExecutionException e) {
                log.info("id:" + s + " is deleted or it never existed");
            }
        }
    }
    return result;
}