Switch order of literals to prevent NullPointerException (#2769)

This change defensively switches the order of literals in comparison
expressions to ensure that no null pointer exceptions are unexpectedly
thrown. Runtime exceptions especially can cause exceptional and
unexpected code paths to be taken, and this can result in unexpected
behavior.

Both simple vulnerabilities (like information disclosure) and complex
vulnerabilities (like business logic flaws) can take advantage of these
unexpected code paths.

Our changes look something like this:

```diff
  String fieldName = header.getFieldName();
  String fieldValue = header.getFieldValue();
- if(fieldName.equals("requestId")) {
+ if("requestId".equals(fieldName)) {
    logRequest(fieldValue);
  }
```

<details>
  <summary>More reading</summary>

*
[https://cwe.mitre.org/data/definitions/476.html](https://cwe.mitre.org/data/definitions/476.html)
*
[https://en.wikibooks.org/wiki/Java_Programming/Preventing_NullPointerException](https://en.wikibooks.org/wiki/Java_Programming/Preventing_NullPointerException)
*
[https://rules.sonarsource.com/java/RSPEC-1132/](https://rules.sonarsource.com/java/RSPEC-1132/)
</details>

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