12/29/2023 0 Comments Stack overflow java webscraper![]() It starts by declaring a pointer to an object, by declaring a reference variable. The most voted up answer broke it down to steps, so it’ll be easier to understand what happens in the process. One question that caught our eye was someone trying to find the root cause of the issue, by asking “ What is a NullPointerException, and how do I fix it?.” In fact, it’s the most common exception in Java production environments. One of the more common exceptions developers encounter is NullPointerException. And indeed, Stack Overflow provides a place where we can consult and search for the right answers to relevant questions, and in most cases, someone has already encountered the very same issue in the past. How much time do you spend going over logs, trying to find exceptions and handle them? We already know the answer – too long. ![]() On the bright side, this issue has been fixed and will deploy in JDK 11, along with some other nice features. Jorn Vernee took this answer one step forward and looked at the corresponding bytecode for this line: According to the official bug report, when “+=” is applied to String operands it can cause some side effects, as we can see in the code above. Prepare to be underwhelmed: it’s a bug in javac, that started at JDK 9. Running this in Java 8, we get the following output:īefore you read on, can you try to guess what happened here? What is the mysterious Java property that led to the different output between versions? To prove it, he created the following code: Why does array+=“a” increase idx once in Java 8 but twice in Java 9 and 10? Kevin Cruijssen, a Software developer from the Netherlands posted asked the following question: Stack Overflow is a place to find answers, but it’s also an excellent place for more questions and riddles. We can always learn something new, and that’s exactly what we decided to search for: Interesting answers to questions we didn’t know we had. ![]() It holds some pretty interesting answers to questions you’ve stumbled upon in your day-to-day tasks, as well as answers to questions you had no idea you should ask. One of the most popular categories on Stack Overflow is Java, with almost 1.5 million questions asked in total, and hundreds that are added every day. The platform provides a place for developers, engineers and others to find answers to an issue that they’re facing, or at least set them on the right track towards a solution. It holds the answers to life, the universe and pretty much everything code related. It’s no secret we all use Stack Overflow. A POJO that encapsulates a ranking week and the name of the corresponding No.A collection of Stack Overflow questions that you shouldn’t miss out on: WeeklyResult & ScraperException remain unchanged. Added a new field latestResult and modified scrape.With that trend in mind, plus the general likelihood that the current week's No.1 has a good chance to remain No.1 for the next week (generally), I changed the code to retain the No.1 player from the past week, in the case of an empty scraped result. Scraper bug fix #2: Further inspection showed that the empty WeeklyResults would be between stretches of the reign of a given player. selectNumberOneRankCell in scrapeWeekly resolves this.However, I had overlooked a case where the first available player-cell was non-empty, but didn't actually belong to the No.1 player. Previously, each weekly result was loaded as an Optional in case the player-cell element was empty. Scraper bug fix #1: certain weeks did not have actual ranking data for the No.1 on the website. To facilitate this, Scraper and MyProject have been modified accordingly.Note that it is not truly "asynchronous" yet - more on that later. This enables the scraper to scrape a week, pass it on to another function that utilizes the scraped result. Rather than scrape ALL the weeks, and return a list of WeeklyResults, the scraper now returns a result for a given week. I understand this is a longer post, so I've divided my question into thematic sections - hopefully this makes it easier for readers to follow and provide feedback where they can! In this version, I'm back with some modifications for my scraper based on my goals for the overarching project I have in mind. Webscraping tennis data 1.1: improving exception handling.Webscraping tennis data: major refactor of code style and program modularity.Through my previous questions, I developed a web-scraper that gets tennis ranking data.
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