Markus Duft created LOG4J2-3358:
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Summary: 2.17.1: JsonLayout Context no longer working.
Key: LOG4J2-3358
URL: https://issues.apache.org/jira/browse/LOG4J2-3358
Project: Log4j 2
Issue Type: Bug
Components: Layouts
Affects Versions: 2.17.1
Reporter: Markus Duft
We're creating a RollingFileAppender programmatically using a JsonLayout. This
uses fields using ${ctx:...} expansion. This stopped working when upgrading
from 2.17.0 to 2.17.1.
The code is as follows:
{code:java}
/**
* Creates a rolling file appender that write audit entries to a
programmatically readable JSON file.
*/
private RollingFileAppender createJsonAppender(Path logDir) {
List<KeyValuePair> fields = new ArrayList<>();
fields.add(KeyValuePair.newBuilder().setKey("who").setValue("${ctx:WHO}").build());
fields.add(KeyValuePair.newBuilder().setKey("what").setValue("${ctx:WHAT}").build());
fields.add(KeyValuePair.newBuilder().setKey("method").setValue("${ctx:METHOD}").build());
fields.add(KeyValuePair.newBuilder().setKey("parameters").setValue("${ctx:PARAMETERS}").build());
RollingFileAppender.Builder<?> builder =
RollingFileAppender.newBuilder();
builder.setName("auditJsonLogger");
builder.withFileName(logDir.resolve(LOG_JSON_FILENAME).toString());
builder.withFilePattern(logDir.resolve(LOG_JSON_FILEPATTERN).toString());
builder.withPolicy(SizeBasedTriggeringPolicy.createPolicy("10M"));
builder.setLayout(JsonLayout.newBuilder().setCompact(true).setEventEol(true).setConfiguration(new
DefaultConfiguration())
.setAdditionalFields(fields.toArray(new
KeyValuePair[0])).build());
builder.withStrategy(
DefaultRolloverStrategy.newBuilder().withCompressionLevelStr(String.valueOf(Deflater.DEFAULT_COMPRESSION))
.withMax(Integer.toString(LOG_MAX_INDEX)).withFileIndex("min").build());
return builder.build();
} {code}
We also tried to use %X\{...} expansion instead to no avail. The log file
always contains the *literal* string we use in .setValue(), i.e. lines like
this:
{noformat}
{"instant":{"epochSecond":1642756242,"nanoOfSecond":271091900},"thread":"hive/fsck","level":"INFO","message":"Execute","endOfBatch":false,"threadId":65,"threadPriority":5,"who":"${ctx:WHO}","what":"${ctx:WHAT}","method":"${ctx:METHOD}","parameters":"${ctx:PARAMETERS}"}{noformat}
Reverting to 2.17.0 will correctly give lines like this in the JSON file:
{noformat}
{"instant":{"epochSecond":1642756430,"nanoOfSecond":923210700},"thread":"hive/fsck","level":"INFO","message":"Execute","endOfBatch":false,"threadId":62,"threadPriority":5,"who":"marku","what":"ObjectConsistencyCheckOperation","method":"-","parameters":"{dryRun=false,
roots=[io.bdeploy/demo/client-app/linux:1.0.0,
io.bdeploy/demo/client-app/linux:2.0.0,
io.bdeploy/demo/client-app/windows:1.0.0, ...]}"}{noformat}
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