Scenario: For a list that have 3 elements: You can circular access it as many times as you want. And there is an additional counting function records access count of each element. For example, if accessing it 7 times, should return: And have access count of each element as following: Add another additional fu…
Tag: java
How to implement only specific method of CrudRepository in Spring?
I’m using CrudRepository of spring-data-jpa to just define an interface of an entity and then having all standard crud methods without having to provide an implementation explicitly, eg: Though now I’d like to override only the save() method in my custom implementation. How could I achieve this? B…
Unparsable Date with colon-separated timezone
I’m trying to parse this String 2014-04-04T14:28:38+02:00 It should be ISO 8601 format. But i can’t parse it to a correct Date. I’ve tried the following: But I get always the message “unparseable Date” I can not change the example because it’s a value from a webservice. Cou…
Maximum length of domain name
As I noticed class from google library com.google.common.net.InternetDomainName containts the following constant: Code below, checks length during creation of InternetDomainName instance: But RFC-2181 says that: So, what is valid max length for domain name? Answer This is straight from wikipedia: The full dom…
Checking to see if a 2d array is jagged
I am finishing up a program but having a bit of trouble with one last aspect. In this part of the program, I am testing to see if the array is jagged (same number of rows and columns). I want to use a nested for loop to do this but am having trouble with the logic and structure. For example,
SimpleDateFormat parse returns bad date
I am using SimpleDateFormat in order to parse a String. Here is an example: When I check dirDate in debug mode, or print it, the date I get is Mon Apr 07 14:35:42 FET 2014. Why do I get such an offset? It cannot be counted as a timezone offset(although it seems already wrong to apply an offset). How can
How to make “MessageDigest SHA-1 and Signature NONEwithRSA” equivalent to “Signature SHA1withRSA “
I am interested in applying a SHA-1 hash with RSA signature to some data, but I need to do it in two steps – apply hash first and then sign the data. The Signature.sign() function appears to create a more complex (ASN.1?) data structure that is ultimately signed (see this question). How can I make the t…
How to fix Hibernate LazyInitializationException: failed to lazily initialize a collection of roles, could not initialize proxy – no Session
In the custom AuthenticationProvider from my spring project, I am trying read the list of authorities of the logged user, but I am facing the following error: Reading other topics from here in StackOverflow, I understand this happens due the way this type of atribute is handled by the framework, but i canR…
Java: How to check that 2 binary files are same?
What is the easiest way to check (in a unit test) whether binary files A and B are equal? Answer Are third-party libraries fair game? Guava has Files.equal(File, File). There’s no real reason to bother with hashing if you don’t have to; it can only be less efficient.
List of ALL Spring Boot application properties
Is there a list of ALL properties that are available in a application.yml or application.properties file when using Spring Boot? I only seem to find the common ones. Answer As rightly pointed out by earlier answers you may find the “common” application properties listed here. But incase you need t…