ppkarwasz commented on a change in pull request #756:
URL: https://github.com/apache/logging-log4j2/pull/756#discussion_r808247913
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File path:
log4j-core/src/main/java/org/apache/logging/log4j/core/layout/PatternLayout.java
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@@ -763,10 +762,7 @@ public Builder withFooter(final String footer) {
@Override
public PatternLayout build() {
- // fall back to DefaultConfiguration
- if (configuration == null) {
- configuration = new DefaultConfiguration();
- }
+ // should work with a null configuration
Review comment:
This requires more explanations: the `PatternParser` does not use a
configuration directly (or has null checks), but allows one to be injected into
the `PatternConverter`s.
Looking at the available `PatternConverter`s, the color converters, "enc",
"equals*", "highlight", "maxLength", "replace", "style", "ex*" require a
configuration to create a `PatternParser`.
I didn't find any converters except `LiteralPatternConverter` that actually
use `Configuration`. `LiteralPatternConverter` has appropriate null checks.
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