Liskov Substitution Principle VS Interface Isolation Principle… here is a solution to the problem. Liskov Substitution Principle VS Interface Isolation Principle I’m having some trouble understanding these two principles. This is a bit of a long reading question, so please be patient. Suppose we have a class abstract class Shape { abstract void onDraw(); } … Read more
Hadoop : JPS can not find Java installed… here is a solution to the problem. Hadoop : JPS can not find Java installed My configuration is hduser@worker1:/usr/local/hadoop/conf$ jps The program ‘jps’ can be found in the following packages: * openjdk-6-jdk * openjdk-7-jdk Ask your administrator to install one of them Although I installed java hduser@worker1:/usr/local/hadoop/conf$ … Read more
$ bin/hadoop namenode -format STARTUP_MSG : host = java.net.UnknownHostException:… here is a solution to the problem. $ bin/hadoop namenode -format STARTUP_MSG : host = java.net.UnknownHostException: I’m currently working on the > via
Exception thrown during rendering: Circular dependencies cannot exist in RelativeLayout Exception details are logged in Window > Show View > Error Log… here is a solution to the problem. Exception thrown during rendering: Circular dependencies cannot exist in RelativeLayout Exception details are logged in Window > Show View > Error Log Suddenly, Eclipse starts reporting … Read more
InflationX/Calligraphy crashes on Android 10… here is a solution to the problem. InflationX/Calligraphy crashes on Android 10 I increased my targetSdkVersion from 26 to 29 and faced this crash : ReflectionUtils.java io.github.inflationx.viewpump.ReflectionUtils.getValue About My App: -App in java language -not using android X –targetSdkVersion 29 Current dependencies in Gradle: implementation ‘io.github.inflationx:calligraphy3:3.0.0’ implementation ‘io.github.inflationx:viewpump:1.0.0’ I also … Read more
How do I pop up a download dialog in my browser from a Django project?… here is a solution to the problem. How do I pop up a download dialog in my browser from a Django project? I’m making a website using Django where I want the download dialog to appear in the browser every … Read more
Why can’t java.util.Set be allocated from java.lang.Iterable?… here is a solution to the problem. Why can’t java.util.Set be allocated from java.lang.Iterable? When I call Set.class.isAssignableFrom(Iterable.class), it returns false. Nevertheless, in the docs , java.util.Set is listed as java.lang.Iterable subinterface. Hence my confusion. You can even try it in one line of code: System.out.println(Set.class.getName() + ” … Read more
HTTP PUT works in RESTClient, but not in Postman or Python httplib… here is a solution to the problem. HTTP PUT works in RESTClient, but not in Postman or Python httplib When I perform a PUT request in RESTClient, it works fine, but fails in the Postman Chrome extension. I need to call the Hadoop … Read more
Looking for new messages added to your IMAP mailbox since the last time you checked with Python imaplib2?… here is a solution to the problem. Looking for new messages added to your IMAP mailbox since the last time you checked with Python imaplib2? I’m trying to write a program to monitor IMAP mailboxes and automatically … Read more
Use joda-time-android with the obfuscator… here is a solution to the problem. Use joda-time-android with the obfuscator I’m trying to use joda-time-android also uses obfuscators in my app. The problem is, when I try to get LocalDate from an intent like this: LocalDate date = (LocalDate) data.getSerializableExtra(“dueDate”); I’m getting this error : Process: org.mpardalos.homeworkmanager, PID: … Read more
Policy patterns and context classes… here is a solution to the problem. Policy patterns and context classes As you read about policy design patterns, consider whether you can have two contexts. If the following code design uses the Policy Design pattern, comments are expected. Or the policy design pattern forces us to have only one … Read more
How to reuse an existing WebDriver instance in multithreading… here is a solution to the problem. How to reuse an existing WebDriver instance in multithreading My application is a multithreaded program. Each thread executes a set of test cases. My idea is to create a new WebDriver instance for each thread and shut down the … Read more