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Questions tagged [mdc]

MDC (*mapped diagnostic context*) is a way to attach thread-scoped named identifier that can be added to every log message from that thread.

It is used to provide log messages with information that is unavailable to the scope when log is written.It provides the thread and user context to log messages and hence stamp each log for better tracking.

For example, it can help put Correlation Id to a request’s logs to help filter it out from similar logs at that time (from other quests) and also track it easily when this request hop from service to service by sharing the Correlation Id.

Typical use cases

Useful links

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How does MDC logging works even though there is no MDC.put() in a method?

I am examining a code written before and it is the first time I have seen MDC logging. I was trying to understand how it works but there a couple of classes which does not have MDC at all, yet the logs are written to the log file. I understand that…
csel
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MDC log with Reactor using logOnNext

I need to show context values in logs of the whole application. I tried to do it in this method: "searchStudents" but I got not success. It seems when do step ".doOnComplete()" the subscriberContext is lost and I need and alternative. Have somebody…
egroque
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How to detect syntax errors when debugging Firefox extensions

When working on a large Firefox plugin, I sometimes accidentally make a syntax error not caught by my editor. When this happens, then calling Components.utils.import("resource://modules/Foo.js") will simply fail to import or return anything,…
Eli Courtwright
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How do I add a request identifier to a Quartz Job instance's log messages?

We use MDC to add a request id to HTTP requests in our Spring Boot application using SLF4J. We do this by adding a GenericFilterBean that intercepts the request, converts to HTTTP, and writes the desired information to MDC.put(...); What is the…
IcedDante
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how to print mdc value in logback

I'm not getting mdc value in logback can you please help me Java Code: String traceId = MDC.get(getJlgConfiguration().getTraceId()); String sessionId = MDC.get(getJlgConfiguration().getSessionId()); Logback.xml
Aswad Shaik
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Hazelcast thread decoration

We are trying to decorate asynchronous Hazelcast threads with our current log (MDC) context. Typically a Hazelcast thread might look like: hz._hzInstance_1_xxx.cached.thread-1] Is this possible? We would like to do something such as the following…
wild_nothing
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Is it possible to disable MDC logging fields in logback for a specific appender/logger?

I need to add an additional logging layer to a project (SpringBoot+LogBack). Currently some fields are added to the MDC to be included in the logs, which is fine. In the new logging layer, I use a new appender and logger and I need to exclude the…
SJ.Jafari
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How to setup logger file which ignore the value put in MDC

I have a scenario where I need to put the value in sl4j.MDC.put("Authorization",(bearer token)). As,it's a thread safe I need to pass it to downstream API in headers. But now the issue is the value is getting printed in my logs as well. Is there any…
abhishek chauhan
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Logback MDC doesn't seem to work with custom class loaders

I have webapp using Spring 5.1.10, running on Jetty 9.4.20. Through out the app JCL is used for logging. Jetty is configured by enabling jcl-slf4j (to capture webapp and Spring messages) and logging-logback module and editing corresponding…
Jacek Prucia
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Reference MDC Variables in the log-message instead of the pattern using Slf4j with Log4j

Is it possible to reference MDC Variables in the log-message instead of the pattern using slf4j with log4j-impl? I have the following piece of code: package example; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import…
Felix
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log4j.xml ignores MDC keys

I have a Spring boot project with the following dependency: [INFO] +- org.springframework.boot:spring-boot-starter-log4j:jar:1.3.8.RELEASE:compile [INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.7.25:compile [INFO] | +-…
user2552806
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MDC-Web CSS theme colors not defined

When running locally my front end i inspect button element and the color --mdc-theme-primary is not defined even when it is. Inspecting the element: Index.html:
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creating an appender with below java code programmatically ,I need to add MDC with my partternLayout

Creating an appender programmatically in java with log4j2.xml need to add MDC key variable with PatternLayout of Log4j2 , can any one look into below code and tell how to add mdc variable whose value will be replaced brfore the looger.info…
Rama Sharma
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log4j is not able to print MDC key-value pair in threads

I am setting key-value pair as MDC.put("txnId", UUID.randomUUID().toString()); with log4j.properties as log4j.appender.R.layout.ConversionPattern=[%d{yyyy-MM-dd HH:mm:ss}] [%m] [%M] [%L] [%p] [%c] [%X{txnId}] %n This works absolutely fine while…
Bush
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Logback and MDC in multithreaded system

I have a multithreaded application where every thread operates different objects with names i.e.: process-1 process-2 process-3 Currently the pattern looks like this: [%thread] - %msg %n And I want to achieve something like this: [%thread]…
Forin
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