• What Is JMeter?
    JMeter is a Java tool for load testing client/server applications, now used for testing web, API, and database performance and functionality.
  • Explain How JMeter Works:
    Simulates users sending requests, collects server responses and stats, and shows application performance in graphs/tables.
  • Where Can You Use Functions and Variables?
    Insert into fields of any test component to parametrize and automate your test plan.
  • What Are Regular Expressions in JMeter?
    For pattern matching and dynamic data extraction throughout a test plan.
  • What Are Samplers and Thread Groups?
    Thread groups set user count and ramp-up; samplers send requests (HTTP, FTP, JDBC, etc.).
  • (Continues with all your original questions/answers…)

2025 Latest JMeter Interview Questions & Answers:

  • What’s new in JMeter 5.x and above?
    Improved Plugin Manager, new timers (Poisson, Precise Throughput), Non-GUI CI/CD integration, WebSocket/gRPC plugins. These enable advanced, scalable, automated performance testing.
  • How do you use JMeter in CI/CD pipelines (Jenkins, GitLab CI)?
    Run JMeter in non-GUI mode, store test plans in source control, trigger via CI, and use HTML Dashboard for reporting and build validation.
  • Integrate JMeter with Selenium WebDriver—why do this?
    Use the WebDriver Sampler to automate browser actions alongside load tests, simulating realistic user scenarios.
  • Advanced parameterization and correlation:
    Use CSV Data Set Config, functions, and extractors (Regex, JSON) to pass dynamic values between requests.
  • What are Poisson and Gaussian timers used for?
    Simulate random and variable delays matching real-world traffic; Poisson for unpredictable loads, Gaussian for varied but centered load patterns.
  • How do you analyze JMeter results for bottlenecks?
    Aggregate/summary reports for response time, error %, throughput; use assertions and transaction controllers to find slow/failed endpoints.
  • Distributed load testing best practices in JMeter 5.x:
    Match slave JVM versions, use remote_start, monitor resource usage, merge results centrally.
  • How do you record mobile app traffic with JMeter?
    Set a JMeter proxy server, configure your device’s proxy, install JMeter’s CA certificate for HTTPS capture.

Bangalore Job Seekers Tips for 2025:

  • Practice building test plans for REST API and web applications with real data.
  • Know how to integrate JMeter into DevOps pipelines.
  • Explore plugins for advanced protocols (gRPC, WebSocket, MQTT).
  • Familiarize with scenario-based and hybrid functional + performance testing.

More Resources for Job Seekers:

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