Servlet State

Servlet State

I’m developing some applications with servlets. I’ve been declaring static variables to preserve state, but when two instances of the servlet run at the same time, the second instance overwrites the values of the first instance. What can I do?

Rather than preserve state with static variables, you should associate state with sessions. There may be multiple instances of a servlet running in a servlet engine and each instance may be serving requests from multiple clients.

Requests from different clients will cause different state changes. If you store states in static variables, other instances of the servlet may overwrite the values and so may requests from different clients.

To preserve state on a session basis, obtain the HttpSession associated with a client request using


You can associate values with the session by storing them in the session object with

setAttribute(String name, Object value)

By storing values in a session, you can preserve state on a per client basis.

Object myValue;HttpSession session;

myValue = "some value";session = request.getSession();session.setAttribute("my.attribute", myValue);

Share the Post:
XDR solutions

The Benefits of Using XDR Solutions

Cybercriminals constantly adapt their strategies, developing newer, more powerful, and intelligent ways to attack your network. Since security professionals must innovate as well, more conventional endpoint detection solutions have evolved

AI is revolutionizing fraud detection

How AI is Revolutionizing Fraud Detection

Artificial intelligence – commonly known as AI – means a form of technology with multiple uses. As a result, it has become extremely valuable to a number of businesses across

AI innovation

Companies Leading AI Innovation in 2023

Artificial intelligence (AI) has been transforming industries and revolutionizing business operations. AI’s potential to enhance efficiency and productivity has become crucial to many businesses. As we move into 2023, several

data fivetran pricing

Fivetran Pricing Explained

One of the biggest trends of the 21st century is the massive surge in analytics. Analytics is the process of utilizing data to drive future decision-making. With so much of

kubernetes logging

Kubernetes Logging: What You Need to Know

Kubernetes from Google is one of the most popular open-source and free container management solutions made to make managing and deploying applications easier. It has a solid architecture that makes

ransomware cyber attack

Why Is Ransomware Such a Major Threat?

One of the most significant cyber threats faced by modern organizations is a ransomware attack. Ransomware attacks have grown in both sophistication and frequency over the past few years, forcing

data dictionary

Tools You Need to Make a Data Dictionary

Data dictionaries are crucial for organizations of all sizes that deal with large amounts of data. they are centralized repositories of all the data in organizations, including metadata such as