My question is related to the following question Mapping postgreSQL JSON column to Hibernate value type and although the answer works when I test passing a string to psql in postgres it doesn’t work when passing a string from my Java code. I am using MyBatis to map sql to the postgres database via Sprin…
How can i put a string in one line
i’m doing some conversion, from Hex to Ascii, when i convert the string, i got the following example: F23C040100C1 100D200000000000 0000 I know that the string is coming like this, because of the base 16, but i want too put it in just one line, like this: F23C040100C1100D2000000000000000 How can i do th…
Is the close method on a try-with-resources idiom not called if a constructor throws an exception?
I have a base class Base and a child class Child which extends it. Base implements java.lang.AutoCloseable. Let’s suppose that the constructor for Child throws a Foo. Now consider Is the Base#close method called if the exception is thrown? It is not on my machine, but is this something that the JLS has …
Display LaTex in Android
I’m trying to display a LaTex item in android in an ImageView. I’m using jlatexmath library. So far, I’ve got TexIcon object from formula. Now I’d like to display that content in ImageView (or anywhere, just need to display them in activity). One way would be to convert it to bitmap or…
Android JUnit3 test ParcelUuid getUuid() returning null for non-null UUID?
I have the following code in an Android JUnit3 unit test: getUuid() is returning null, but the UUID passed to the ParcelUuid is non-null and valid. What gives? Is there something wrong w/ using the Android runtime library in a JUnit test? Thanks! Pv Answer Revisiting over 5.5 years later after I saw someone u…
How to re-create database before each test in Spring?
My Spring-Boot-Mvc-Web application has the following database configuration in application.properties file: this is the only config I made. No any other configurations made by me anywhere. Nevertheless the Spring and subsystems are automatically recreate database on each web application run. Database is recre…
Java – Multi-threaded crawler with ExecutorService
I’m working to make a crawler in Java. I made a single-threaded crawler to visit a single page and fetch all links on that page. Now I want to make it multi-threaded but facing difficulties. In the very beginning I start with single link of the page and crawl through all the links in it and Now I want t…
using Constructor without “new” word in java
So I’m trying to learn to use Reflection in java(so i think its called), so I did a little project to make an object without the optimal Constructor pattern with the “new” word. Unfortunately, it shows me an error for the class type array for the constructor. Here is my project: SomeClass.ja…
Check if input is of Primitive type in Java?
I have to check for each input and print out if it is an instance of a primitive or referenced type. But I am getting same output each time. Note: I do search SO, but no luck. How can I check if an input is a integer or String, etc.. in JAVA? Code: } Output: Answer Before I address your
How are strings passed into methods in java (In terms of memory)
When we call methods, if you are passing in a primitive type, that value is put on the stack frame when calling the method. If you are passing in a reference type, if it’s not null, you would have already created it on the heap some where and what gets put on the stack is a reference to it. But