EgorBaranovEnjoysTyping opened a new pull request, #13495:
URL: https://github.com/apache/ignite/pull/13495
## IGNITE-28747: Fix NPE in GridToStringBuilder#handleRecursion
### Problem
`NullPointerException` occurs when `GridToStringBuilder.handleRecursion()`
is called during `toString()`
building of recursive structures. The `tail` field in
`SBLimitedLength` remains `null` because its
initialization was only triggered inside `onWrite()`, but
`handleRecursion()` directly calls `buf.a(...)`
methods, bypassing `onWrite()`.
### Root Cause
In `SBLimitedLength`, the original code in `master` branch directly called
`tail.append(...)` in all `a(...)`
methods without checking if `tail` is initialized first. This caused
NPE when recursion occurred.
### Solution
Added centralized `initTailIfAbsent()` method that checks and creates `tail`
only when needed. Replaced direct
`tail.append(...)` calls with `initTailIfAbsent()` +
`tail.append(...)` pattern.
### Related
JIRA: https://issues.apache.org/jira/browse/IGNITE-28747
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