Hi Sudeep. SLF4J Loggers are available throughout the code. Are you trying to log details from inside a processor? Within the framework, there are various implementations of `ComponentLog` [1], and `ProcessorLog` (just a marker interface), which is implemented by `SimpleProcessLogger` [2]. From within a processor which extends `AbstractProcessor` [3], you can call `getLogger()` to return an instance of `ProcessorLog` and then write to it as you would any SLF4J logger instance.
```java
String key = "someKey";
String value = "someValue";
final ProcessorLog logger = getLogger();
logger.warn("This is a warning message");
logger.info("This is a message with some interpolation key={}, value={}", new
String[]{key, value});
```
This will result in the output:
```
[pool-2-thread-1] WARN org.apache.nifi.processors.standard.EncryptContent -
EncryptContent[id=1c569c19-d37b-4d30-aec7-410b318c360d] This is a warning
message
[pool-2-thread-1] INFO org.apache.nifi.processors.standard.EncryptContent -
EncryptContent[id=1c569c19-d37b-4d30-aec7-410b318c360d] This is a message with
some interpolation key=someKey, value=someValue
```
We recommend using SLF4J, but if you have a requirement to use Log4j, you can
use an adapter as described here [4].
[1]
https://github.com/apache/nifi/blob/3a7ddc6a35f143c1d4a735226fe7467a83d04583/nifi-api/src/main/java/org/apache/nifi/logging/ComponentLog.java
[2]
https://github.com/apache/nifi/blob/807eb8de6d7054cef1fac91cbf2e2a1eb37d30ed/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/processor/SimpleProcessLogger.java
[3]
https://github.com/apache/nifi/blob/31fba6b3332978ca2f6a1d693f6053d719fb9daa/nifi-api/src/main/java/org/apache/nifi/processor/AbstractProcessor.java
[4] http://www.slf4j.org/legacy.html
Andy LoPresto
alopresto.apa...@gmail.com
PGP Fingerprint: 70EC B3E5 98A6 5A3F D3C4 BACE 3C6E F65B 2F7D EF69
> On Feb 10, 2016, at 7:54 PM, sudeep mishra <sudeepshekh...@gmail.com> wrote:
>
> Hi,
>
> What is the preferred practice for logging details for NiFi data flow? How
> can I use my own logging using log4j to log custom details for NiFi data flow.
>
>
> Thanks & Regards,
>
> Sudeep
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