Merge pull request #5591 from getsentry/perf/sdk-overhead-reduction-json-writer-stack

perf(core): [SDK Overhead Reduction 6] Reduce JsonWriter stack allocation

Author: adinauer

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Internal
 
+- Reduce JSON serialization overhead by lowering the initial `JsonWriter` nesting stack size while preserving on-demand growth. ([#5591](https://github.com/getsentry/sentry-java/pull/5591))
 - Reduce timestamp helper overhead by replacing unnecessary `Calendar` usage in `DateUtils` with direct `Date` creation. ([#5589](https://github.com/getsentry/sentry-java/pull/5589))
 - Reduce Android startup overhead by using the default timezone directly on older devices or when no timezone info is available in the locale. ([#5587](https://github.com/getsentry/sentry-java/pull/5587))
 

sentry/src/main/java/io/sentry/vendor/gson/stream/JsonWriter.java

@@ -17,7 +17,7 @@
 // Source: https://github.com/google/gson
 // Tag: gson-parent-2.8.7
 // Commit Hash: 4520489c29e770c64b11ca35e0a0fdf17a1874ab
-// Changes: @ApiStatus.Internal, SuppressWarnings
+// Changes: @ApiStatus.Internal, SuppressWarnings, reduced stack size
 
 package io.sentry.vendor.gson.stream;
 
@@ -175,7 +175,7 @@ public class JsonWriter implements Closeable, Flushable {
   /** The output data, containing at most one top-level array or object. */
   private final Writer out;
 
-  private int[] stack = new int[32];
+  private int[] stack = new int[8];
   private int stackSize = 0;
   {
     push(EMPTY_DOCUMENT);