JavaOne2016 #CON5929 Time-Saving Tips and Tricks for Building Quality Java Applications
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This document provides time-saving tips and tricks for building quality Java applications more quickly, including using appropriate tools and IDEs to code and review quickly, automating UI and business logic tests to test quickly without restarting containers each time, and techniques for deploying and redeploying quickly such as reducing JVM startup time and enabling hot-swapping of code changes.
![Time-Saving Tips and Tricks for Building Quality
Java Applications
[CON5929]
Yusuke Yamamoto @yusuke](https://image.slidesharecdn.com/javaone2016con5929-time-savingtipsandtricksforbuildingqualityjavaapplications-160922223840/85/JavaOne2016-CON5929-Time-Saving-Tips-and-Tricks-for-Building-Quality-Java-Applications-1-320.jpg)
![WebDriver driver = new FirefoxDriver();
driver.get("https://www.google.com/");
WebElement element =
driver.findElement(By.className("gsfi"));
element.click();
element.sendKeys("JavaOne 2016");
driver.findElement(By.name("btnK")).click();
Thread.sleep(100000);
Navigator navigator = new Navigator();
navigator.open("https://www.google.com/");
$(".gsfi").click();
$(".gsfi").sendKeys("JavaOne 2016");
$("[name='btnK']").click();](https://image.slidesharecdn.com/javaone2016con5929-time-savingtipsandtricksforbuildingqualityjavaapplications-160922223840/85/JavaOne2016-CON5929-Time-Saving-Tips-and-Tricks-for-Building-Quality-Java-Applications-24-320.jpg)
JavaOne2016 #CON5929 Time-Saving Tips and Tricks for Building Quality Java Applications
- 1. Time-Saving Tips and Tricks for Building Quality Java Applications [CON5929] Yusuke Yamamoto @yusuke
- 2. CON5929#
- 3. Yusuke Yamamoto • Author of Samurai & Twitter4J • 16 years in Java industry @yusuke @yusuke
- 7. .equals( )
- 8. Time-Saving Tips and Tricks for Building Quality Java Applications
- 10. Quality Application • Stable • Performant • Easy to understand • Easy to fix #CON5929 fewer bugs = ! can handle more requests = !
- 11. Code Review Test Deploy Fail Fix Code Review Test Deploy Fail Fix " "
- 12. Code quickly Code Review Test Deploy Code Review Test Deploy
- 13. Code quickly Use appropriate tool / IDE Code #CON5929 completion generation inspection
- 14. demo Using Twitter4J - retrieve my home timeline - print status text with @username only if the user is not @yusuke #CON5929
- 15. Help > Productivity Guide
- 17. Review quickly Code Review Test Deploy Code Review Test Deploy
- 18. Review on IDE Do Code reviews on IDE, NOT on browser you cannot trace references / definitions #CON5929
- 19. Review on IDE #CON5929 ,or use Upsource
- 20. Test quickly Code Review Test Deploy Code Review Test Deploy
- 21. Test UI as well as business logic • UI tend to break easier • More automated UI tests • Less manual UI tests
- 22. Selenium • automated UI testing tool http://www.seleniumhq.org WebDriver driver = new FirefoxDriver(); driver.get("https://www.google.com/"); WebElement element = driver.findElement(By.className("gsfi")); element.click(); element.sendKeys("JavaOne 2016"); driver.findElement(By.name("btnK")).click(); Thread.sleep(100000);
- 24. WebDriver driver = new FirefoxDriver(); driver.get("https://www.google.com/"); WebElement element = driver.findElement(By.className("gsfi")); element.click(); element.sendKeys("JavaOne 2016"); driver.findElement(By.name("btnK")).click(); Thread.sleep(100000); Navigator navigator = new Navigator(); navigator.open("https://www.google.com/"); $(".gsfi").click(); $(".gsfi").sendKeys("JavaOne 2016"); $("[name='btnK']").click();
- 26. How to use 1. Download, and Unpack zip 2. Set system properties properly System.setProperty("phantomjs.binary.path", "path/to/phantomjs"); System.setProperty("browser", "phantomjs");
- 27. How to use 3. Add dependency to your project <dependency> <groupId>com.codeborne</groupId> <artifactId>phantomjsdriver</artifactId> <version>1.2.1</version> </dependency>
- 28. How to use 4. You're good to go WebDriver driver = new PhantomJSDriver(); driver.get("https://www.google.com/"); WebElement element = driver.findElement(By.className("gsfi")); element.click(); element.sendKeys("JavaOne 2016"); driver.findElement(By.name("btnK")).click();
- 29. PhantomJSInstaller Check PhantomJS Installation Download, unpack, install automatically #CON5929 yusuke/javaone2016demo
- 30. Do not boot container every time. Use existing container process if available.
- 31. Test quickly Do not boot container every time. Use existing container process if available. #CON5929
- 32. Test quickly #CON5929 TestCase Container Test Target boot instantiate GET / HTTP/1.0 … method()
- 33. Skip booting the container 1. Check the container availability. 2. Boot one only when necessary. 3. Test
- 34. Test quickly #CON5929 TestCase Container Test Target GET / HTTP/1.0 … method() check availability
- 35. Deploy quickly Code Review Test Deploy Code Review Test Deploy
- 36. Start & Redeploy quickly -Xverify:none Disables byte code verification. -XX:TieredStopAtLevel=1
- 37. Time to startup with/witout options seconds 2.0 3.0 4.0 5.0 6.0 7.0 8.0 default -Xverify:none -XX:TieredStopAtLevel=1 -XX:TieredStopAtLevel=1 -Xverify:none default: 7.13 secs -Xverify:none: 6.17 secs -XX:TieredStopAtLevel=1: 4.55 secs combined: 4.00 secs 53% faster
- 38. HotSwap #CON5929
- 39. HotSwap • JVM built-in feature • Reloads class changes on the fly • Available only in debug session
- 40. HotSwap
- 41. HotSwap limitation • applicable only for method body changes