Android NullPointerException: Read the Throw Site and Restore the Missing State
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Code quality
Android Bug Finder
Run static analysis on pasted Android Java/Kotlin source to surface likely bugs, risky API usage, null and lifecycle smells, and insecure patterns.
Android Bug Finder is part of APKLint, an online toolkit for inspecting Android APK files. Run static analysis on pasted Android Java/Kotlin source to surface likely bugs, risky API usage, null and lifecycle smells, and insecure patterns. Paste your Kotlin or Java source in your browser to view the relevant details; results reflect what you paste.
Nothing is stored. What you submit is processed on our servers over an encrypted connection for this request only — it isn’t written to file or object storage, and never shared. No account required.
About Android Bug Finder
Run static analysis on pasted Android Java/Kotlin source to surface likely bugs, risky API usage, null and lifecycle smells, and insecure patterns.
Android Bug Finder is part of APKLint’s code quality toolkit — Static analysis for Kotlin, Java, and your Gradle build. It’s free to use and needs no account.
Your privacy is the default: what you submit is processed on our servers over an encrypted connection for that request only — it isn’t written to file or object storage, and never shared.
What Android Bug Finder checks
- Risky API usage, plus null-assertion (!!) and lifecycle smells (observeForever)
- Hard-coded secrets and insecure patterns
- Common Android anti-patterns
- Quick, paste-and-go feedback
Good to know: A fast pattern-based scan of pasted code — it finds common smells, not every bug, and isn't a compiler or full analyzer.
When to use Android Bug Finder
- Best for
- Surfacing likely bugs in pasted Android Java/Kotlin, risky API use, lifecycle errors, and nullability traps, before they reach testing.
- Not the right tool for
- Not a linter for style/performance (use Android Lint) and not project-wide.
- What you get back
- A list of probable bugs with an emphasis on lifecycle, null-safety, and risky API usage.
- How it differs from related APKLint tools
- Where the Static Code Analysis tool frames findings as security/smell patterns, the Bug Finder frames them as likely defects.
- Limitations
- Heuristic bug-spotting on a snippet; it cannot prove a bug or see the whole codebase.
How to use Android Bug Finder
- Paste your code — Paste one Java or Kotlin source file or snippet.
- Send for analysis — APKLint checks it on our servers over an encrypted connection.
- Review the findings — Work through each result with a short explanation of why it matters.
- Nothing is stored — Your pasted text is processed for this request only — it isn't written to file or object storage, logged for analytics, or shared.
Why use APKLint
Always free
Every tool is free with no login and no paywall. Reasonable file and input limits keep the free service stable.
No on-page ad banners
A clean, focused interface with no third-party ad banners cluttering your results.
Privacy-first
What you submit is processed for the request only — it isn't written to file or object storage, and never shared.
How it runs
Lightweight pattern-based static checks — a heuristic scan, not a full Lint build.
No sign-up
Start immediately — no account, login, or email required.
Works anywhere
Runs in any modern browser, on desktop or mobile.
Frequently asked questions
What does Android Bug Finder do?
Run static analysis on pasted Android Java/Kotlin source to surface likely bugs, risky API usage, null and lifecycle smells, and insecure patterns.
Is this a real static analyzer?
It's a heuristic pattern checker for pasted snippets. For full project analysis, run Android Lint and detekt in your build.
Is it free to use?
Yes. Every tool on APKLint is completely free, with no sign-up and no account.
How is my data handled?
What you submit is sent to our backend over an encrypted connection only to produce your result. It isn't written to file storage, used for analytics, or shared.
What should I paste in?
Paste one Java or Kotlin source file or snippet.
Related tools
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