Maple Wang created LOG4J2-1510:
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Summary: why MutableLogEvent don't keep the ReusableObjectMessage
Key: LOG4J2-1510
URL: https://issues.apache.org/jira/browse/LOG4J2-1510
Project: Log4j 2
Issue Type: Question
Components: Core
Affects Versions: 2.6.2
Reporter: Maple Wang
Priority: Blocker
After upgrading Log4j from 2.5 to 2.6.2, I found that log event catched by my
appender is changed from Log4jLogEvent to MutableLogEvent, it's fine except
that I can't get the ObjectMessage from MutableLogEvent. If I sent object
message thought log4j API like log.info(object);, I assume object can be
obtained in ReusableObjectMessage, but since MutableLogEvent look like don't
keep it as below:
public void setMessage(final Message msg) {
if (msg instanceof ReusableMessage) {
final ReusableMessage reusable = (ReusableMessage) msg;
reusable.formatTo(getMessageTextForWriting());
if (parameters != null) {
parameters = reusable.swapParameters(parameters);
parameterCount = reusable.getParameterCount();
}
} else {
// if the Message instance is reused, there is no point in freezing
its message here
if (!Constants.FORMAT_MESSAGES_IN_BACKGROUND && msg != null) { //
LOG4J2-898: user may choose
msg.getFormattedMessage(); // LOG4J2-763: ask message to freeze
parameters
}
this.message = msg;
}
}
So , when I call the getMessage from MutableLogEvent like below, I only can
get the instance of MutableLogEvent itself.
public Message getMessage() {
if (message == null) {
return (messageText == null) ? EMPTY : this;
}
return message;
}
I know I can use other MessageFactory to bypass it, but why MutableLogEvent
don't keep the ReusableObjectMessage, is that on purpose? Is there other way to
get the ReusableObjectMessage from MutableLogEvent?
Best reagrds.
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