Blog

by 0 comments on "Java Pass-by-Value vs Pass-by-Reference"

In Java, when we talk about pass-by-value and pass-by-reference, we are referring to how arguments are passed to methods. It is important to have a clear understanding of these concepts as they play a crucial role in Java programming. Understanding pass-by-value and pass-by-reference is crucial in Java programming because it helps prevent confusion and ensures…

Read More Java Pass-by-Value vs Pass-by-Reference
by 0 comments on "Java Regex – Regular Expression Examples"

Java Regex, also known as Regular Expression, is a powerful tool used for manipulating and managing strings. It consists of a sequence of characters that form a pattern, which can be used to match and locate specific strings within a larger text. In Java, regular expression functionality is provided through the java.util.regex package, which includes…

Read More Java Regex – Regular Expression Examples
by

In this tutorial, you will learn what the @Respository annotation is and how to use it in your Spring Boot applications. @Repository is a Spring annotation that indicates that the decorated class is a repository. A repository is a mechanism for encapsulating storage, retrieval, and search behaviour which emulates a collection of objects. How to…

Read More @Repository Annotation in Spring
by

@Component is a Spring annotation that is used to indicate that a class is a component. Components are objects that make up the structure of an application and are responsible for performing specific tasks. They are typically used to represent services, controllers, repositories, and other types of objects that are used to implement business logic…

Read More @Component Annotation in Spring
by

The purpose of this tutorial is to address a common issue that many Java developers encounter when working with the Scanner class. Specifically, we’ll discuss the challenge of using nextLine() after calling nextInt(). When utilizing the Scanner class to read input from the user, it’s not uncommon to encounter unexpected behavior when calling nextLine() immediately…

Read More Handling Scanner’s nextLine() after nextInt()
by

The java.lang.OutOfMemoryError is a runtime exception in Java that occurs when the Java Virtual Machine (JVM) exhausts all available memory and is unable to allocate more memory to fulfill the memory requirements of an application. This error indicates that the application has run out of heap space and is unable to create new objects or…

Read More java.lang.OutOfMemoryError: Resolving Memory Management Issues
by

The java.sql.SQLException: No Suitable Driver Found error is a common issue encountered when working with Java Database Connectivity (JDBC) to establish a connection with a database. This error typically occurs when the JDBC driver required to connect to a specific database is not found or not properly configured in the application. It is an indication…

Read More Resolving java.sql.SQLException: No Suitable Driver Found
by

The “Too Many Clients” issue in PostgreSQL occurs when the number of concurrent client connections exceeds the configured maximum limit. When this happens, the PostgreSQL server is unable to accept any new connections, leading to the org.postgresql.util.PSQLException: FATAL error. This error message indicates that the database server has reached its maximum capacity for handling client…

Read More PostgreSQL: FATAL Error – Dealing with ‘Too Many Clients’
by

Dates and times play a critical role in many Java applications. They are used for various purposes such as scheduling tasks, logging events, data analysis, and working with databases. Java provides several classes and libraries to handle date and time-related operations efficiently. In this tutorial, you will learn about the difference between java.util.Date and java.sql.Date.…

Read More java.util.Date vs java.sql.Date
by

JDBC (Java Database Connectivity) is a fundamental technology for connecting Java applications to databases. It provides a standardized API that enables developers to interact with various database systems seamlessly. However, like any technology, JDBC is not immune to errors and issues. Resolving errors related to JDBC is crucial for maintaining the stability and functionality of…

Read More Troubleshooting JDBC Errors
by

The “Communications link failure” error is a common exception encountered when working with Java applications that interact with a MySQL database. This error message, “com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure,” indicates a failure in establishing a connection between the Java application and the MySQL database server. The error typically occurs when there is an issue with the…

Read More Resolving the “Communications link failure” Error
by

When working with Java database connectivity (JDBC), you may come across the error message: “java.sql.SQLException: The server timezone value ‘UTC’ is unrecognized.” This error occurs when the JDBC driver is unable to recognize the timezone value specified by the database server. It often arises when there is a mismatch between the server’s timezone configuration and…

Read More java.sql.SQLException: The server timezone value ‘UTC’ is unrecognized
by

The “java.sql.SQLException Parameter index out of range” error is a common exception encountered by Java developers when working with databases through JDBC (Java Database Connectivity). This error occurs when attempting to bind a parameter to a prepared SQL statement but providing an invalid or out-of-range index for the parameter. When executing parameterized SQL queries or…

Read More Resolving the ‘java.sql.SQLException Parameter index out of range’ error
by

In Java, the PreparedStatement interface is a powerful feature provided by the JDBC API (Java Database Connectivity) to execute parameterized SQL queries. It extends the Statement interface and allows you to execute SQL statements with placeholders for parameters. The PreparedStatement is precompiled and cached by the database server, resulting in improved performance and security compared…

Read More PreparedStatement in Java: Explained in Details