This article delves into the similarities and differences between the findBy and findOneBy prefixes in Spring Data JPA. It explores the concept of derived query methods, provides code examples, and explains the exception thrown by findBy queries when the result size doesn’t match expectations.
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Abderrahim Azhrioun
Full Stack Developer, Java Geek, Spring Lover, and a Blogger. I believe coding should be fun and accessible to everyone ;)
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Handle NoSuchElementException When Reading a File Through Scanner
Filed under Java IO
In this tutorial, we’ll explore handling the ‘NoSuchElementException: No line found’ exception when reading a file using the Scanner class in Java. We’ll explain its root cause and present three solutions: defensive programming, exception handling, and checking file emptiness.
What’s the Difference between Scanner next() and nextLine() Methods?
Filed under Java IO
This article delves into the difference between the next() and nextLine() methods of the Scanner class.The article also covers the use of custom delimiters and provides code examples for better understanding. Understanding these distinctions enables developers to parse input effectively using Scanner.
Java PrintStream to String
Filed under Java IO, Java String
This article provides several ways of converting a PrintStream to a String in Java.The approaches include using ByteArrayOutputStream, a custom output stream, and Apache Commons IO.
Spring Boot H2 JdbcSQLSyntaxErrorException expected “identifier”
Filed under Persistence, Spring Boot
This tutorial explains the exception org.h2.jdbc.JdbcSQLSyntaxErrorException: Syntax error in SQL statement expected “identifier”. It provides a practical example to reproduce the exception and showcases how to fix it by double-quoting the keyword or using a JDBC URL workaround. It also covers how to automatically quote all database identifiers when using Hibernate.
Check if the First Letter of a String Is a Number
Filed under Java String
This tutorial explains different ways to check if the first character of a string is a number in Java. It covers using charAt(), Character.isDigit(), Pattern class, and matches() method. It also demonstrates how to use Guava’s CharMatcher utility class to accomplish the same objective.
Fix the JsonMappingException: Can not deserialize instance of java.util.ArrayList from Object value (token JsonToken.START_OBJECT)
Filed under Jackson
Learn how to fix a common JsonMappingException when deserializing a JSON string.
Fix Spring Data JPA Exception: No Property Found for Type
Filed under Spring Data
This article explains how to fix the “PropertyReferenceException: No property found for type” in Spring Data JPA. It advises using exact property names when defining query methods to avoid the exception. Practical examples are provided.
Fix EmptyResultDataAccessException When Using JdbcTemplate
Filed under Spring Persistence
Explanation of the reason behind EmptyResultDataAccessException when jdbcTemplate is used and how to fix it.