Better-Coding

[SOLVED] PLS-00201 – identifier must be declared. Hints to solve the problem

Post author:lukasz.ciesla
Post published:April 3, 2019

Here is the solution for most common causes of Oracle PL/SQL PLS-00201 - identifier must be declared exception. 1. Problem You got a PLS-00201 - identifier must be declared exception…

Enabling HTTPS in Spring Boot application

Post author:lukasz.ciesla
Post published:March 31, 2019

Encrypting network communication using SSL is currently a standard. Therefore, the need for HTTPS configuration in web applications often arises. In today's post I will present how easy it is…

How to add SSL certificate into Java cacerts file and JKS keystore.

Post author:lukasz.ciesla
Post published:March 31, 2019

There are some situation when you want to add certificate into the Java trust store. For example: it is useful in case that you want to trust a self signed…

Android ActionBar(TopBar) – How to create Switch and Radio Buttons

Post author:lukasz.ciesla
Post published:March 31, 2019

I this article I'll show you how to customize Android top menu by adding widgets like Switch and RadioButton group. I'll also show you how to handle actions associated with…

[SOLVED] Android: socket failed: EACCES (Permission denied)

Post author:lukasz.ciesla
Post published:March 30, 2019

When you try to connect with web server you got the following exception: java.net.SocketException: socket failed: EACCES (Permission denied) at java.net.Socket.createImpl(Socket.java:492) at java.net.Socket.getImpl(Socket.java:552) at java.net.Socket.setSoTimeout(Socket.java:1180) at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:244) at ... okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)…

[SOLVED] Android: Cannot send data to the server. CLEARTEXT communication to not permitted by network security policy

Post author:lukasz.ciesla
Post published:March 30, 2019

When you try to connect with a server via HTTP, you got the exception like below Cannot send data to the server java.net.UnknownServiceException: CLEARTEXT communication to 192.168.1.175 not permitted by…

Integration tests on negative scenarios – Mockito, Dynamic Proxy, JUnit, Spring

Post author:lukasz.ciesla
Post published:March 27, 2019

While writting one of the applications that I've recently co-created, it turned out to be necessary to check the behaviour of the app. I mean situations like database exception, infrastructure…

[SOLVED] org.w3c.dom.DOMException: WRONG_DOCUMENT_ERR:

Post author:lukasz.ciesla
Post published:March 12, 2019

Here you can find the solution for a problem: org.w3c.dom.DOMException: WRONG_DOCUMENT_ERR exception The problem When you invoke a web service you got the exception like below: org.w3c.dom.DOMException: WRONG_DOCUMENT_ERR: A node…

Messenger – How to change to the awesome black theme

Post author:lukasz.ciesla
Post published:March 3, 2019

Facebook has recently released a test version of the new black color scheme for Messenger. I must admit that this is an option that I had been waiting for. To…

[SOLVED] NullPointerException – How to fix it?

Post author:lukasz.ciesla
Post published:January 23, 2019

Today I am going to explain to you the exception known to every Java programmer, namely NullPointerException. I hope that once you get to the end of the article, it will become clear to you why this exception is so special.