docs: Improve String concatenation best practice #3553
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This change splits the "don't use String concatenation" best practice into two parts:
- A recommendation concerning performance: string concatenation is not efficient if the logger is off.
- A security recommendation: format string must be constants to prevent `{}` placeholder injection.
The `${dangerousLookup}` part of the example is removed, since lookups are not executed since version `2.15.0`
ppkarwasz
changed the title
vy
reviewed
Mar 21, 2025
| + | ||
| [source,java] | ||
| ---- | ||
| /* GOOD */ LOGGER.info(() -> "failed for user ID: " + userId); |
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@ppkarwasz, I think this is a foot gun. It'd be very hard to distinguish for inexperienced users, which is the chief audience of this guide, why it is fine to do string concatenation here, whereas before it was not. IMHO, this should not be supported by the API in the first place, but anyway. In short, unless you strongly object, can we remove this part, please?
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This change splits the "don't use String concatenation" best practice into two parts:
{}placeholder injection.The
${dangerousLookup}part of the example is removed, since lookups are not executed since version2.15.0