🔎 Stack Trace Root Cause Finder

A lightweight developer tool that helps identify the likely root cause from a stack trace.

This tool analyzes stack traces and highlights the first application-level stack frame, which is often the most likely root cause of an exception.

Built with Python + Streamlit.

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🚀 Demo

Try the tool online:

https://stack-trace-root-cause-finder.streamlit.app

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❓ Why This Tool Exists

When debugging crashes, stack traces often contain many framework and system calls, such as:

• Android framework
• Java runtime
• Kotlin runtime
• AndroidX libraries

Example raw stack trace:

java.lang.NullPointerException
    at android.view.View.performClick(View.java:7125)
    at android.view.View.performClickInternal(View.java:7102)
    at com.example.app.ui.LoginFragment.onLoginClicked(LoginFragment.kt:87)
    at com.example.app.ui.LoginFragment.onViewCreated(LoginFragment.kt:65)

The actual root cause is often hidden among many framework calls.

The most important line is usually:

com.example.app.ui.LoginFragment.onLoginClicked(LoginFragment.kt:87)

This tool automatically finds that line.

🧠 Example Output

Exception: NullPointerException

Root Cause Candidate:
com.example.app.ui.LoginFragment.onLoginClicked(LoginFragment.kt:87)

File / Line:
LoginFragment.kt:87

This helps developers quickly jump to the likely source of the crash.

✨ Features

• Detect exception type from stack trace

• Extract stack frames

• Filter framework and system frames

• Identify the most likely root cause frame

• Highlight file name and line number

• Simple and fast analysis

🔧 Supported Stack Trace Types

Currently optimized for:

• Android stack traces

• Java stack traces

• Kotlin stack traces

Example system frames automatically filtered:

• android.*

• androidx.*

• java.*

• kotlin.*

• dalvik.*

⚙️ How It Works

The analyzer uses a simple heuristic:

1. Extract exception type

2. Extract all stack frames

3. Filter out system/framework frames

4. Return the first remaining frame

In many real-world crashes, this frame is the best candidate for the root cause.

🖥 Run Locally

Install dependencies

pip install -r requirements.txt

Run the Streamlit app

streamlit run app.py

Then open your browser:

http://localhost:8501

📁 Project Structure

stack-trace-root-cause-finder
│
├── app.py
├── requirements.txt
└── README.md

🧪 Example Stack Trace

java.lang.IllegalStateException: Fragment not attached to a context.
    at androidx.fragment.app.Fragment.requireContext(Fragment.java:900)
    at com.example.app.ProfileFragment.loadProfile(ProfileFragment.kt:31)
    at com.example.app.ProfileFragment.onStart(ProfileFragment.kt:22)
    at android.app.Activity.performStart(Activity.java:8050)
    at java.lang.reflect.Method.invoke(Method.java:566)

Expected root cause candidate:

com.example.app.ProfileFragment.loadProfile(ProfileFragment.kt:31)

🔍 Audience

This project targets common developer searches such as:

• stack trace analyzer

• stack trace root cause finder

• android stack trace analyzer

• java stack trace parser

• debugging stack traces

• exception root cause analysis

🔗 Related Tools

You may also be interested in:

• Crash Log Analyzer : https://crash-log-analyzer.streamlit.app
• Logcat Error Filter : https://logcat-error-filter.streamlit.app

These tools help developers debug logs more efficiently.