Why am I unable to send the logs to Splunk through log4j2?

se123987 — Mon, 04 Apr 2022 16:11:42 GMT

I'm trying to send my logs from java to splunk through log4j2 . I'm doing log4j2 configuration programatically.

I know this is not the correct way to do so. But I'm still doing this for learning purpose.

After execution of my java code I see the console appender logs in console but not the splunk appender logs in splunk. I don't know what I'm missing here.

I've tried with postman with same url and token. In this case it works well.

code of my POM file is here ==>

<dependencies>  <dependency> <groupId>com.splunk.logging</groupId> <artifactId>splunk-library-javalogging</artifactId> <version>1.11.4</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.11.2</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.11.2</version> </dependency> <dependency> <groupId>com.splunk</groupId> <artifactId>splunk</artifactId> <version>1.6.5.0</version> </dependency> </dependencies> <repositories> <repository> <id>splunk-artifactory</id> <name>Splunk Releases</name> <url>https://splunk.jfrog.io/splunk/ext-releases-local</url> </repository> </repositories>

my java code is here =>>

import java.util.*; import org.apache.logging.log4j.Level; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import org.apache.logging.log4j.core.config.Configurator; import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder; import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory; import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration; import org.apache.logging.log4j.core.layout.PatternLayout; import com.splunk.logging.*; import java.io.*; public class Main { private static final Logger log; static { configureLog4J(); log = LogManager.getLogger(Main.class); } public static void configureLog4J() { ConfigurationBuilder<BuiltConfiguration> builder = ConfigurationBuilderFactory.newConfigurationBuilder(); // configure a splunk appender builder.add( builder.newAppender("splunk", "SplunkHttp") .add( builder.newLayout(PatternLayout.class.getSimpleName()) .addAttribute( "pattern", "%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" ) ) .addAttribute("sourcetype", "log4j") .addAttribute("index", "main") .addAttribute("url", "http://localhost:8088/services/collector") .addAttribute("token", "XXX") .addAttribute("host", "java") ); //configure console appender builder.add( builder.newAppender("console", "Console") .add( builder.newLayout(PatternLayout.class.getSimpleName()) .addAttribute( "pattern", "%logger{36}-%msg%n" ) )); // configure the root logger builder.add( builder.newRootLogger(Level.INFO) .add(builder.newAppenderRef("splunk")) .add(builder.newAppenderRef(("console"))) ); // apply the configuration Configurator.initialize(builder.build()); } public static void main(String ar[]) { System.out.println("START"); log.info("ok"); log.log(Level.INFO, "BY from log4j2"); log.log(Level.ERROR, "BY Error from log4j2"); System.out.println("END"); } }

Re: Why am I unable to send the logs to Splunk through log4j2?

VatsalJagani — Tue, 05 Apr 2022 06:37:11 GMT

@se123987 - Please check this out.

https://dev.splunk.com/enterprise/docs/devtools/java/logging-java/howtouseloggingjava/enableloghttpjava/

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Re: Why am I unable to send the logs to Splunk through log4j2?

se123987 — Tue, 05 Apr 2022 10:21:07 GMT

Hi @VatsalJagani I cannot relate this with my problem. If u know which I miss please tell the exact solution.

Re: Why am I unable to send the logs to Splunk through log4j2?

PickleRick — Tue, 05 Apr 2022 10:36:55 GMT

The obvious approach in such case is to:

1) Trace your program and see what methods are called and what they return.

2) I never used log4j2 but I supposed that due to what it does it would probably catch and silently "drop" many of its own internal exceptions. Check if you can enable internal log4j2 debugging.

3) Verify network traffic to check whether your program is indeed connecting to your indexer and tries to send something or not.

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Why am I unable to send the logs to Splunk through log4j2?

Re: Why am I unable to send the logs to Splunk through log4j2?

Re: Why am I unable to send the logs to Splunk through log4j2?

Re: Why am I unable to send the logs to Splunk through log4j2?