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JavaSpecialists

Issue 273 - Truly Public Methods

Class.getMethods() returns all the public methods in this class and the classes in its ancestry. However, we cannot necessarily call these methods, for example if they are declared in a private inner class or a lambda. In this newsletter we attempt to find all truly public methods.

Issue 272 - Hacking Enums Revisited

In a previous newsletter, we looked at how we could dynamically add new enums and also rewire affected switch statements. Due to improvements in Java security, our old approach needs to be updated for Java 12.

Issue 271 - HttpClient Executors

Java 11 added the HttpClient to give us a better way to send HTTP requests. It supports asynchronous and synchronous mode. HTTP2 comes out of the box. The threading is a bit funky though and Professor Cay Horstmann explores how things work underneath the covers.

Issue 270 - Excursions into Deduplication

When are Strings deduplicated? How can we find out whether they are of any benefit in our application? How much does it cost in terms of CPU? We try to show you how we can get this from the deduplication statistics provided by the JVM.

Issue 269 - Heterogeneous Comparisons

The compareTo() function has three rules. Break any one of them and you might get an exception when you sort. In this newsletter we explore what these rules are and how they can affect sorting.


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Events

January 23

Thursday

Blog Posts

How to Build an Image Crawler Without Coding

Posted by erika fu on October 9, 2019 at 9:08pm 1 Comment

Saving an image from the webpage is straightforward. Simply right-click and select "save image as". But what if you have hundreds or even thousands of images that need to be saved? Will the same trick work? At least not for me!

In this article, I want to show you how to quickly build an image crawler with ZERO codings. Even if you have absolutely no tech background, you should be able to nail this within 30 mins. So for whatever reasons you may need…

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Swampcast features Tim Westergren, Pandora CEO

Posted by Michael Levin on August 3, 2019 at 12:30pm 0 Comments

Join Michael Levin in this Swampcast interview with Tim Westergren, Pandora CEO. Click here to listen. Photo…

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Next OJUG and GatorJUG Meetings will be fabulous - Check out the Codetown Events

Watch for details on our upcoming meetings. OrlandoJUG meeting's fall on the 4th Thursday of every month, in case you want to mark your calendars. Stay tuned for details! GatorJUG meets the 2nd Wednesday of every month.


The details are posted in the CodeTown Events section. Please RSVP so we'll know how much pizza to order. Stay tuned! ...Mike

Groups

Forum

Octoparse: the best web scraping solution

About several years ago, when came up with Crawler, Web scraping,  Data Capturing, people can't help imaging that a programmer is coding in front of a computer. However, today, things are changing and everyone can capture the data they want on their…Continue

Tags: webscraping, crawler

Started by erika fu in Trends Oct 9.

Be Careful What You Wish For

Interesting. Ask Elon Musk what scares him…Continue

Tags: Braintree, PayPal, kernal, google, neuralink

Started by Michael Levin in AI, ML & Big Data Aug 8.

Java books for any library 5 Replies

What books should be on the bookshelf of EVERY Java programmer, no matter what specific technologies they are working on?The two that come to my mind areThinking in JavaJava Concurrency in PracticeWhat else am I missing?Continue

Started by David Moskowitz in Java. Last reply by sneha gulati Feb 8.

Error trying to use Fragment

I am new to Android.  I have been working thru some examples in a book called  Head First Android Development.  I entered a small program using fragments and get a Casting Error.cannot cast andoid.app.fragment to…Continue

Tags: Fragment

Started by Robert Sobol in Java Oct 10, 2017.

Fragment Syntax Problem

My name is Rob Sobol.I have been working through a book called Head First Android Development.I hit a syntax error in a simple exercise that uses one fragment. I have been trying to figure out the error for days.  I am hoping some in the forum can…Continue

Tags: Fragments

Started by Robert Sobol in Java Oct 10, 2017.

Hadoop getting old?

An article just came out in InfoWorld about trends, which is always an interesting subject. Funny, they said Hadoop wasn't hot. Spark is. It's a good read. …Continue

Tags: codetown, infoworld, programming, hadoop, trends

Started by Michael Levin in Trends Apr 10, 2017.

What's functional programming, anyway?

Can you believe people are still trying to come up with a good definition or explanation of what functional programming is? Paul Krill is a journalist with InfoWorld. Here's an article he just wrote: …Continue

Tags: functions., codetown, lambdas, clojure, programming

Started by Michael Levin in Functional Programming Feb 21, 2016.

Santafe College 2 Replies

Santafe just added a new BAS  bachelor's program of study. 5651  ProgrammingContinue

Started by Dan Lackey in Dynamic Languages. Last reply by Michael Levin Feb 15, 2016.

Using SQL with Node,.js 1 Reply

All the tutorials and books for node.js seem to use Mongo as the database.  I am not sold on 'document' databases and would like to know how difficult it is to use any version for plain old tried-and-true SQL with Node.js.Does anybody have any…Continue

Tags: 'document, databases', SQL, node, node.js

Started by Kevin Neelands in Dynamic Languages. Last reply by Lou Caudell Nov 10, 2015.

The advantages of a RESTfull web-based API 5 Replies

I need to get a better handle on the advantages of a RESTful web-based API.  People tell me they scale better than other methods, but I don't see how they reduce database access or have any other feature that helps handle large amounts of traffic.…Continue

Tags: API', 'web-based, RESTful

Started by Kevin Neelands in Dynamic Languages. Last reply by Kevin Neelands Oct 25, 2015.

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Latest Activity

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October OJUG

Folks, I’m giving a talk on AI at Devoxx next month in Morocco. Our scheduled Spring talk is postponed. Let me know if you’d like a preview of my AI talk instead. We don’t meet Nov/Dec. Here’s the abstract: https://twitter.com/mikelevin/status/1181949549117607937?s=21See More
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Village Talkies is now a member of Codetown
Oct 10
erika fu commented on erika fu's video
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Create your first scraper within minutes with Octoparse

"About several years ago, when came up with Crawler, Web scraping,  Data Capturing, people can't help imaging that a programmer is coding in front of a computer.  However, today, things are changing and everyone can capture the data…"
Oct 9
erika fu posted a discussion

Octoparse: the best web scraping solution

About several years ago, when came up with Crawler, Web scraping,  Data Capturing, people can't help imaging that a programmer is coding in front of a computer. However, today, things are changing and everyone can capture the data they want on their own without coding. This turning point happened at 11/201 when the concept, Octoparse task template was put forward ( Here is an article that introduces the function:…See More
Oct 9
erika fu commented on erika fu's blog post How to Build an Image Crawler Without Coding
Oct 9
erika fu posted a video

Create your first scraper with Octoparse 7 X (Updated)

In this tutorial, we will learn how to create your first scraper with Octoparse. Whether you are a brand new starter or an experienced pro, Octoparse will he...
Oct 9
erika fu is now a member of Codetown
Oct 9
Michael Levin's video was featured
Oct 3
Michael Levin posted a video
Oct 3
Camila Aug commented on Paul Black's blog post Octoparse vs. Import.io comparison: which is best for web scraping?
"Hi Paul, thanks for writing this up. I've been using Proxycrawl for the past year or so and after looking at your post I decided to give Octoparse a try. Do you know if in the free octopare version I can use Proxycrawl? As you say it supports…"
Oct 2
Camila Aug is now a member of Codetown
Oct 2
Michael Levin's discussion was featured

Live OrlandoJUG broadcast tonight

Tonight’s Orlandojug will be broadcast live! Monitor @OrlandoJUG on Twitter for the URL!See More
Sep 27
Michael Levin added a discussion to the group OrlandoJUG Town
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Live OrlandoJUG broadcast tonight

Tonight’s Orlandojug will be broadcast live! Monitor @OrlandoJUG on Twitter for the URL!See More
Sep 27
Jose Sosa joined Michael Levin's group
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OrlandoJUG Town

Calling all Java lovers! The OrlandoJUG features leading edge presentations with you in mind. We meet every month with talks on interesting aspects of programming in Java. Although we're Java-focused, you'll also learn about other JVM languages.Twitter & Facebook @orlandojug Check the Codetown Events section for specifics about meetings.See More
Sep 21
Jose Sosa joined Michael Levin's group
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Spring Town

Dependency injection. It's a smart approach. Believe that? We do! Come on in and share what you know. Ask all your Spring questions here, too!
Sep 21
Jose Sosa is attending Michael Levin's event
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OrlandoJUG ::: JPA 2.1 Entity Graphs in Spring Data with Richard at Starter Studio

January 23, 2020 from 6pm to 8pm
Join us for a talk featuring Richard ThibaultRichard Thibault is a full-stack web and mobile developer with over 25 years of experience in the software industry. He is currently focused on Java and Spring, though he also develops in Objective C, Swift, and Javascript. He has built apps for various industries over the years, including banking, travel, and real estate. In…See More
Sep 21
Profile IconJose Sosa and Wincy Ip joined Codetown
Sep 21
Jose Sosa shared Michael Levin's event on Facebook
Sep 21
 
 
 

Happy 10th year, JCertif!

Notes

Welcome to Codetown!

Codetown is a social network. It's got blogs, forums, groups, personal pages and more! You might think of Codetown as a funky camper van with lots of compartments for your stuff and a great multimedia system, too! Best of all, Codetown has room for all of your friends.

When you create a profile for yourself you get a personal page automatically. That's where you can be creative and do your own thing. People who want to get to know you will click on your name or picture and…
Continue

Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.

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InfoQ Reading List

CircleCI Adds Security Integrations to Streamline Securing CI/CD Pipelines

CircleCI announced the addition of new orbs that address common use cases and needs with securing your CI/CD pipelines. The orbs added to the repository with this release cover vulnerability scanning, secrets management, license scanning, and digital scanning. It includes integrations with AWS and Google Cloud.

By Matt Campbell

Mini book: The InfoQ eMag: Remote Meetings

Working remotely is becoming routine. Our goal in this eMag is to help you do things better. We’ll show how people all over the world worldwide are successfully facilitating complex conversations, remotely. We’ll also share practical steps you can take right now, to upgrade the remote conversations that fill your working days.

By InfoQ

Presentation: Making a Lion Bulletproof: SRE in Banking

Robin van Zijll and Janna Brummel talk about the history, present and future of ING’s SRE team and practices. They touch upon people (hiring, coaching, organizational aspects, culture), process (way of working, education), technology (observability, infrastructure), and share lessons learned that can be applied to any organization starting or growing SRE, financial or not.

By Robin van Zijll, Janna Brummel

Presentation: Building a High-performance Networking Protocol for Microservices

Robert Roeser and Arsalan Farooq talk about how techniques used in Fintech and Adtech – such as zero copy, flyweights, composite buffers, pooled memory, shared memory transport, direct memory in languages like Java – can be used to improve performance in distributed applications.

By Robert Roeser, Arsalan Farooq

Article: The Current and Future State of Testing: a Conversation with Lisa Crispin

Lisa Crispin talks about the current and future state of testing, how testing works in agile environments, the value testers bring to DevOps, testing machine learning and where testing is headed. Testing is a communication activity and communication skills are vital to successfully leveraging testing skills and knowledge in modern software development.

By Xiaoqian Geng, Lisa Crispin

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