Abderrahim Azhrioun

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.

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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.

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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.

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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.

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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.

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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.

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