Matt Sicker created LOG4J2-1823:
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Summary: Remove deprecation on MessageSupplier lambda functions in
Logger API
Key: LOG4J2-1823
URL: https://issues.apache.org/jira/browse/LOG4J2-1823
Project: Log4j 2
Issue Type: Improvement
Components: API
Affects Versions: 2.6
Reporter: Matt Sicker
Assignee: Matt Sicker
Fix For: 2.8.1
The changes done in LOG4J2-1286 to deprecate MessageSupplier were not properly
tested in practice. Using log4j-api ever since the deprecation, the following
code causes deprecation warnings:
{code}
logger.info(() -> new SimpleMessage("Hello, world!"));
{code}
This is because the compiler interprets this as a {{MessageSupplier}} instead
of the more generic {{Supplier<Message>}} version which is the intended API.
Although manual use of {{MessageSupplier}} should be discouraged, users should
not have to manually cast the above lambda just to prevent a deprecation
warning:
{code}
logger.info((Supplier<Message>) () -> new SimpleMessage("Hello, world!"));
{code}
{{MessageSupplier}} should become a normal part of log4j-api with a note on
both it and {{Supplier<T>}} that these interfaces would be removed in a
log4j-api 3.0 release and replaced with the Java 8 version.
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