Exception Analyzer
Understand exceptions and how to handle them
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Which line of a forty line stack trace is actually yours? When an app throws at 2am, most of what you are reading is framework internals, and the line that matters is buried in the middle. The Exception Analyzer reads the trace, the code around it and your description of what should have happened, then explains what broke.
Short answer: The Exception Analyzer is for the moment a trace lands and none of the frames look like yours. Paste the exception, the frames and the method they point at, and it returns the likely root cause and a fix.
What is Exception Analyzer?
It is a debugging assistant that works entirely on text you paste. Give it the exception, the trace and the method the trace points at, and the Exception Analyzer explains what the error means, which line triggered it and what to change. It never runs your program. It cannot see your database, your environment variables or the request behind the failure, so everything it says is worked out from what sits in the prompt box.
Paste This, Not Just The Red Line
The answer is only as good as the paste. An exception name on its own gets you a list of common causes. Add the frames that mention your own package and the analysis turns specific:
java.lang.NullPointerException: price is null
at shop.CartService.total(CartService.java:42)
at shop.CheckoutController.review(CheckoutController.java:88)Then add the method at that top frame and one line about what you expected instead. If the log is enormous and you need its shape before picking the right frames, run it through the Text Summarizer first.
| What you paste | What the analysis can tell you |
|---|---|
| The exception name alone | Common causes, none of them certainly yours |
| Exception plus stack trace | The failing line and the call path that reached it |
| Trace plus the method source | A specific root cause and a concrete fix |
| Trace, source and what you expected | The fix plus the guard that stops a repeat |
How Does Exception Analyzer Work?
Paste everything in one go, then pick a model from the selector. In Advanced options, set Language or leave it on Auto-Detect, set Issue Type to Exception, and choose the Output you want. Root Cause gives the diagnosis alone. Fix + Explanation returns corrected code with it. Step-by-Step Debug suits a bug you have already failed to find once, and Analysis Depth set to Deep helps there too. Explain Root Cause, Provide Fixed Code and Suggest Prevention are on already. Show Test to Reproduce is off, so switch it on when you want a failing test. Press Generate, then copy the fix into your editor.
Where It Needs A Second Opinion
Where it is strong
- Naming a familiar exception class and its usual triggers
- Spotting a null, an off by one or a bad cast in the pasted method
- Turning a trace into a summary a ticket can carry
Where it is guessing
- It cannot see the data or the request that caused the failure
- A cause several layers away from your paste stays invisible
- Timing and concurrency bugs rarely show up in one snapshot
Important Nothing here runs your code. Treat the suggested fix as a hypothesis and confirm it against the failing case before it goes near production.
When the fix does not hold and you are back to a broken build, the Error Fixer takes the same paste from a different angle.
EizTools keeps its tools free and open: no account, no credit counter, nothing to install. Every tool has its own advanced options and its own prompt engineering, meaning the instructions behind it are written for one job. You choose the model each time you generate, and results copy or download in a click. The Exception Analyzer sits among the debugging tools built for exactly this kind of paste.
Frequently Asked Questions
Does it run my code to find the bug?
No. It reads what you paste and writes an analysis back. Nothing is executed, compiled or connected to your environment, so the fix it suggests stays a hypothesis until you run it yourself.
How much of the code should I paste?
The method the top frame points at, plus anything it calls that could return null. More context helps, but a whole file of unrelated code dilutes the analysis and pushes the frames that matter out of view.
What if the trace shows no line from my own code?
Paste it anyway and say which library call you made. The analysis points at the boundary between your code and the framework, which is usually where a bad argument was handed over.
Can it write a test that reproduces the bug?
Yes. Show Test to Reproduce is off by default, so switch it on. You get a small failing test built around the pasted case, which is the quickest way to prove a fix really works.
Reading a stack trace properly is a skill, and nobody builds it at 2am with a queue of failed jobs behind them. Paste the exception, the frames and the method, ask for the root cause, then check the answer against the case that failed. The trace stops being a wall of text and becomes one line you can act on.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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