Code Im trying to load this URL in webview and the webview is empty. What’s wrong with this URL? I tried replacing the URL with other links and it works perfectly. Answer It’s been a SSL handshake failed for HTTPS URL. for debugging the webview, pls add following line and you can inspect webview U…
How to collect a map of a pojo id to a set of a property of a collection on the pojo
I’m trying to use streams to get a map of a pojo to a Set of items exposed by a property on the pojo. I realise that isn’t clear so I’ll show how I’ve done it without streams. I have and enum of …
Why Kotlin/Java doesn’t have an option for preemptive scheduler?
Heavy CPU bound task could block the thread and delay other tasks waiting execution. That’s because JVM can’t interrupt running thread and require help from programmer and manual interruption. So writing CPU bound tasks in Java/Kotlin requires manual intervention to make things run smoothly, like …
Gradle Compile & Execute the Single Java Class with third-party jar dependencies using Gradle `buildscript`
I followed this answer https://stackoverflow.com/a/19418847/1665592 but it doesn’t help me to compile single java files using Gradle. It says Task :compileMessageKeys NO-SOURCE Why? I just have only one Java File CreateMessageKeysTask.java which is dependent on “apache-ant-1.7.0/ant.jar” jar…
Java Looking for specific letters in a sting
I was wondering how to iterate over a string and to check how many hi’s come out For example, if the string is “hihi” the count should output 2. This is what I have so far Answer You compare instances (like String) with .equals (not ==). However, here you can use == with String.charAt(int). …
How to use WriteBatch with Firebase storage?
I’m using Firebase cloud database and firebase storage. I’m using the following code in order to remove two documents using WriteBatch: I want also to remove the image from the storage using WriteBatch, meaning, if one of them fails, they all fail to remove. I have a variable called imageURL which…
TransformerFactory still vulnerable to XXE attacks
I have a method like below. I’ve set the FEATURE_SECURE_PROCESSING to true. When I run my unit test below, I can list the files under project directory, meaning it is vulnerable to XXE attacks. How can I secure the TransformerFactory to such attacks? Answer You’re supplying a DOMSource to the Tran…
Read hashmap nested properties dynamically
I have the JSON below: I turned this JSON into a Java HashMap using the Gson library. I need to dynamically read some properties of this created hashmap. Ex: title, name of contact and name of company. Sometimes these properties (title, name of contact and name of company) can be inside lists. Below my code: …
Should I annotate pojo class with @Component?
I searched whether I should annotate POJO with @Component or not. It seems like it is recommended not to annotate pojo. Here is my OrderStatusMnemonic Configuration class that reads a txt file: OrderStatus POJO: Since I am autowiring OrderStatus POJO class I am getting error: Consider defining a bean of type …
What is the best way to update the ip adress of serversocket for clients?
I’m programming a little server example with Sockets in Java. Currently I’m using this for testing: but my plan is to move it to my Raspberry Pi. Unfortunately, I don’t have a static IP address. What is the proper way to update the IP address in the code? I thought about storing it on a webs…