ppkarwasz opened a new pull request #753:
URL: https://github.com/apache/logging-log4j2/pull/753
This PR fixes a couple of issues concerning filters in the Log4j 1.x bridge:
- there is an endless loop in `FilterAdapter#filter` that hangs the program
if more than one filter per appender is configured,
- filters are executed multiple times per log message.
The second problem comes from chains of Log4j 1.x filters: a filter chain is
split into a `CompositeFilter` of `FilterAdapter`s (one for each filter). Each
`FilterAdapter` executes its own filter and all those that come later in the
chain.
In order to preserve the behavior of `FilterAdapter` the following
restrictions have been applied to the generated filters:
1. no chains of Log4j 1.x filters are generated by the configuration
factories; a list of Log4j 1.x filters is represented as a wrapped
`CompositeFilter` of `FilterAdapter`s (or native Log4j 2.x filters),
2. the factories don't generate any `FilterWrapper`s of `FilterAdapter`s
nor `FilterAdapter`s of `FilterWrapper`s.
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