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Fix NegativeArraySizeException in MainActivity negative_index handler - #256

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Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR

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Fixes ANDROID-KZ

Root cause

The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:

int[] a = newint[-5];

Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).

Fix

The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:

intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);

Verification

Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:

  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.

Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).

@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
sentryBot requested a review from sdzhong as a code ownerAugust 11, 2026 23:15
@sentry

sentryBot commented Aug 11, 2026•
edited
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📲 Install Builds

Android

🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release

⚙️ android Build Distribution Settings

@codecov

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Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).

Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:
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@claude
, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Fix NegativeArraySizeException in MainActivity negative_index handler by sentry[bot] · Pull Request #256 · sentry-demos/android · GitHub
Skip to content
Fix NegativeArraySizeException in MainActivity negative_index handler - #256
Open
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Open
Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Conversation
@sentry
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Aug 11, 2026

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Fixes ANDROID-KZ
Root cause
The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:
int[] a = newint[-5];
Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).
Fix
The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:
intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);
Verification
Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:
  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.
Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).
@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
sentryBot
requested a review
from sdzhong
as a code ownerAugust 11, 2026 23:15
@sentry
sentryBot
commented
Aug 11, 2026•

edited

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Author
📲 Install Builds
Android
🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release
⚙️ android Build Distribution Settings
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Aug 11, 2026

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Codecov Report
❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).
Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5 
☔ View full report in Codecov by Harness.

📢 Have feedback on the report? Share it here.
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Fix NegativeArraySizeException in MainActivity negative_index handler by sentry[bot] · Pull Request #256 · sentry-demos/android · GitHub
Skip to content
Fix NegativeArraySizeException in MainActivity negative_index handler - #256
Open
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Open
Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Conversation
@sentry
@sentrysentryBot
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Aug 11, 2026

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Fixes ANDROID-KZ
Root cause
The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:
int[] a = newint[-5];
Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).
Fix
The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:
intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);
Verification
Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:
  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.
Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).
@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
sentryBot
requested a review
from sdzhong
as a code ownerAugust 11, 2026 23:15
@sentry
sentryBot
commented
Aug 11, 2026•

edited

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Author
📲 Install Builds
Android
🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release
⚙️ android Build Distribution Settings
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Aug 11, 2026

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Codecov Report
❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).
Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5 
☔ View full report in Codecov by Harness.

📢 Have feedback on the report? Share it here.
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
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document.head.appendChild(style);
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var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Fix NegativeArraySizeException in MainActivity negative_index handler by sentry[bot] · Pull Request #256 · sentry-demos/android · GitHub
Skip to content
Fix NegativeArraySizeException in MainActivity negative_index handler - #256
Open
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Open
Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Conversation
@sentry
@sentrysentryBot
commented
Aug 11, 2026

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Fixes ANDROID-KZ
Root cause
The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:
int[] a = newint[-5];
Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).
Fix
The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:
intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);
Verification
Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:
  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.
Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).
@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
sentryBot
requested a review
from sdzhong
as a code ownerAugust 11, 2026 23:15
@sentry
sentryBot
commented
Aug 11, 2026•

edited

Loading

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Author
📲 Install Builds
Android
🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release
⚙️ android Build Distribution Settings
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commented
Aug 11, 2026

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Codecov Report
❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).
Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5 
☔ View full report in Codecov by Harness.

📢 Have feedback on the report? Share it here.
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
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} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
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});
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});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Fix NegativeArraySizeException in MainActivity negative_index handler by sentry[bot] · Pull Request #256 · sentry-demos/android · GitHub
Skip to content
Fix NegativeArraySizeException in MainActivity negative_index handler - #256
Open
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Open
Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Conversation
@sentry
@sentrysentryBot
commented
Aug 11, 2026

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Fixes ANDROID-KZ
Root cause
The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:
int[] a = newint[-5];
Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).
Fix
The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:
intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);
Verification
Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:
  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.
Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).
@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
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📲 Install Builds
Android
🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release
⚙️ android Build Distribution Settings
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Codecov Report
❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).
Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5 
☔ View full report in Codecov by Harness.

📢 Have feedback on the report? Share it here.
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@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Fix NegativeArraySizeException in MainActivity negative_index handler by sentry[bot] · Pull Request #256 · sentry-demos/android · GitHub
Skip to content
Fix NegativeArraySizeException in MainActivity negative_index handler - #256
Open
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Open
Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Conversation
@sentry
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Fixes ANDROID-KZ
Root cause
The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:
int[] a = newint[-5];
Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).
Fix
The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:
intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);
Verification
Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:
  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.
Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).
@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
sentryBot
requested a review
from sdzhong
as a code ownerAugust 11, 2026 23:15
@sentry
sentryBot
commented
Aug 11, 2026•

edited

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Author
📲 Install Builds
Android
🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release
⚙️ android Build Distribution Settings
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Aug 11, 2026

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Codecov Report
❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).
Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5 
☔ View full report in Codecov by Harness.

📢 Have feedback on the report? Share it here.
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Fix NegativeArraySizeException in MainActivity negative_index handler by sentry[bot] · Pull Request #256 · sentry-demos/android · GitHub
Skip to content
Fix NegativeArraySizeException in MainActivity negative_index handler - #256
Open
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Open
Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Conversation
@sentry
@sentrysentryBot
commented
Aug 11, 2026

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Fixes ANDROID-KZ
Root cause
The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:
int[] a = newint[-5];
Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).
Fix
The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:
intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);
Verification
Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:
  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.
Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).
@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
sentryBot
requested a review
from sdzhong
as a code ownerAugust 11, 2026 23:15
@sentry
sentryBot
commented
Aug 11, 2026•

edited

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Author
📲 Install Builds
Android
🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release
⚙️ android Build Distribution Settings
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Aug 11, 2026

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Codecov Report
❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).
Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5 
☔ View full report in Codecov by Harness.

📢 Have feedback on the report? Share it here.
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
Fix NegativeArraySizeException in MainActivity negative_index handler by sentry[bot] · Pull Request #256 · sentry-demos/android · GitHub
Skip to content
Fix NegativeArraySizeException in MainActivity negative_index handler - #256
Open
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Open
Fix NegativeArraySizeException in MainActivity negative_index handler#256
sentry[bot] wants to merge 1 commit into
mainfrom 
claude/fix-negative-array-size-01Mt7xt3kWU67rHf2MXrJupR
Conversation
@sentry
@sentrysentryBot
commented
Aug 11, 2026

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Fixes ANDROID-KZ
Root cause
The onClick handler for the negative_index button in MainActivity allocated an array with a hardcoded negative size:
int[] a = newint[-5];
Java does not permit negative array sizes, so this line always throws NegativeArraySizeException: -5 and crashes the app as soon as the button is tapped (MainActivity.java:61).
Fix
The requested size is now clamped to a non-negative value before the allocation, and the invalid input is reported to Sentry as a handled warning instead of taking down the process:
intrequestedSize = -5;
// Java does not allow negative array sizes, so clamp before allocatingintsize = Math.max(requestedSize, 0);
if (size != requestedSize) {
Sentry.captureMessage(
"Requested array size " + requestedSize + " is negative, allocating " + size + " instead",
SentryLevel.WARNING);
}
int[] a = newint[size];
Log.i(activity, "Allocated int array of length " + a.length);
Verification
Since the Android SDK/NDK is not available in this environment, the handler was verified by compiling MainActivity against the real Sentry (8.51.0) and Gson jars plus minimal stubs for the Android framework classes it uses, then invoking the registered negative_index click listener:
  • Original code: java.lang.NegativeArraySizeException: -5 thrown from the lambda (reproduces the reported crash).
  • Patched code: listener runs to completion, no exception, array of length 0 allocated and the negative size reported as a handled warning.
Sentry.captureMessage(String, SentryLevel) was confirmed to exist in the SDK version used by the project (javap against sentry-8.51.0.jar).
@claude
Fix NegativeArraySizeException in MainActivity negative_index handler
367ddb7
The onClick handler for the 'negative_index' button allocated an array
with a hardcoded negative size (new int[-5]), which always throws
NegativeArraySizeException at runtime and crashes the app.
Clamp the requested size to a non-negative value before allocating and
report the invalid size to Sentry as a handled warning instead of
crashing.
Fixes [ANDROID-KZ](https://demo.sentry.io/issues/7653041035/)
@sentry
sentryBot
requested a review
from sdzhong
as a code ownerAugust 11, 2026 23:15
@sentry
sentryBot
commented
Aug 11, 2026•

edited

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Author
📲 Install Builds
Android
🔗 App NameApp IDVersionConfiguration
Androidcom.example.vu.android24.12.26 (241226)release
Androidcom.example.vu.android24.12.26 (241226)debug
Androidcom.example.vu.android24.12.26 (241226)release
⚙️ android Build Distribution Settings
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Aug 11, 2026

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Codecov Report
❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

✅ Project coverage is 0.00%. Comparing base (21c77a4) to head (367ddb7).
Files with missing linesPatch %Lines
...main/java/com/example/vu/android/MainActivity.java0.00%6 Missing ⚠️
Additional details and impacted files
@@ Coverage Diff @@## main #256 +/- ##
=====================================
Coverage 0.00% 0.00% =====================================
Files 16 16 Lines 883 888 +5 Branches 67 68 +1 =====================================
- Misses 883 888 +5 
☔ View full report in Codecov by Harness.

📢 Have feedback on the report? Share it here.
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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@claude