above is my XML. I’ve to validate the same. I’m using DBUnit to compare the same XML with other XML (other XML has the same content but generated from different source). While creating dataset I’m getting “org.dbunit.database.AmbiguousTableNameException”. I’ve SQL query for…
Proper fix for Java 10 complaining about illegal reflection access by jaxb-impl 2.3.0?
We are looking at upgrading some legacy code to Java 10. As JAXB is not visible by default (EDIT: and the proper long term solution is not to circumvent the symptom using various JVM flags, but fix it properly) I have added this snippet to my pom.xml: Unfortunately there is still a warning printed at startup …
How to remove controller list from Swagger UI
I’m using springfox-swagger-ui 2.8.0 which ships with Swagger UI 3.7.0. I want to get rid of the controller list in front of the api documentation page, pretty useless for me (every tab is empty). I’ve already tried to annotate the controller class with @ApiIgnore, but of course this removes the r…
java.util.Map values() method performance
I have a map like this with several million entries: I need to get list of values, which could be done by calling java.util.Map values() method. Is Collection of values created every time I call values() method or is it pre-computed from performance perspective? As my Map has several millions elements, I do n…
Apache POI – Conditional formatting – need to set different cell range for rule and formatting
I am trying to create an empty excel template using apache poi java. I need to add a rule – when column no. 3 is populated then columns from 7 to 12 need to be highlighted in some color (as a mandatory indicator for the user). I could find below code which colors the cell when the condition is met
How to get children keys from Firebase without downloading their children?
I have a Firebase database with a node “items” that has many children and I would like to import a list of the children keys. Since each child contains quite some data that I am not interested in for this purpose, I would like to download only the children keys (to minimize the amount of data tran…
KafkaStreams is not running. State is ERROR
I have a Kafka consumer class that listens to events and perform join between events (Order, Customer) and store them in a materialized view. I created another class to access state store when REST call received. But I am getting java.lang.IllegalStateException: KafkaStreams is not running. State is ERROR. I …
Spring unit test issue with Validator
I am trying to write unit test for a validator class that I have. So within my UniqueEmailValidator class, I injected a @Service component to check if it exist. And I tried to write unit test for this constraint validator. How do I initialize the AccountService within the Validator class? It seem like it wasn…
Display squares of asterisks, filled and hollow, side by side
I’m currently trying to display a filled asterisk square and a hollow asterisk : Instead, I’m getting this output: I’m not so sure how to make it side by side instead of up and down. Do I have to put the hollow nested loop inside the filled loop or do I have to do something else? Here is my …
Instance created inside of a Method
I have not been able to find any reliable literature on this but i’m curious as to where an object is stored if its created inside of a method ? on the stack or on the heap in java 8? I know that normally only local primitives, reference variables and function calls are stored on the stack and that obje…