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Enterprise Java
How to Fix PSQLException Operator Does Not Exist Character Varying = UUID
When working with Spring JPA and PostgreSQL, you might encounter an error like PSQLException: Operator Does Not Exist: character varying…
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Core Java
Store File or byte[] as SQL Blob in Java (Store and Load)
In many applications, you might need to store files or binary data directly in a database. PostgreSQL offers a data…
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Core Java
Read Last N Lines From File in Java
Reading the last N lines of a file is a common task in Java, especially when dealing with log files…
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Core Java
hasItems() vs. contains() vs. containsInAnyOrder() in Hamcrest
Hamcrest is a popular framework for writing matcher objects, allowing for more readable and flexible unit tests. Among its many…
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Core Java
Solve UnsupportedTemporalTypeException Unsupported Field InstantSeconds
When working with Java’s date and time API, you may encounter the UnsupportedTemporalTypeException with the message Unsupported field: InstantSeconds. Let…
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Core Java
Check if a Variable Is Null Using Hamcrest
In unit testing, verifying that a variable is null is a common task. Hamcrest, a popular framework for writing matcher…
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Core Java
Insert JSON Object to PostgreSQL using preparedStatement
Storing JSON data in a PostgreSQL database can be quite efficient and effective. PostgreSQL offers two data types to store…
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Enterprise Java
Finding the Max Value in Spring Data JPA
When working with Spring Data JPA, retrieving specific values from a database is a common requirement. One such requirement is…
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Core Java
Guide to CompletableFuture join() vs get()
Java’s CompletableFuture is a powerful tool for asynchronous programming, offering various methods to handle and manipulate future tasks. Among these…
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