I was trying to use log4j2 HttpAppender, but I get this error:
2024-09-24T07:59:58.504101611Z main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.HttpAppender for element Http: java.lang.NullPointerException: layout java.lang.NullPointerException: layout
at java.base/java.util.Objects.requireNonNull(Objects.java:259)
at org.apache.logging.log4j.core.appender.HttpAppender.<init>(HttpAppender.java:170)
at org.apache.logging.log4j.core.appender.HttpAppender.<init>(HttpAppender.java:40)
at org.apache.logging.log4j.core.appender.HttpAppender$Builder.build(HttpAppender.java:85)
at org.apache.logging.log4j.core.appender.HttpAppender$Builder.build(HttpAppender.java:46)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:124)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1164)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1085)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1077)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:681)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:264)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:313)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:631)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:713)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:735)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:260)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:154)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:46)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:197)
at org.apache.commons.logging.LogAdapter$Log4jLog.<clinit>(LogAdapter.java:146)
at org.apache.commons.logging.LogAdapter$Log4jAdapter.createLog(LogAdapter.java:113)
at org.apache.commons.logging.LogAdapter.createLog(LogAdapter.java:95)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:67)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:59)
at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:203)
at com.leonardo.test.TestApplication.main(TestApplication.java:10)
2024-09-24T07:59:58.506231729Z main ERROR Unable to invoke factory method in class org.apache.logging.log4j.core.appender.HttpAppender for element Http: java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.HttpAppender java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.HttpAppender
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.findFactoryMethod(PluginBuilder.java:268)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:140)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1164)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1085)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1077)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:681)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:264)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:313)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:631)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:713)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:735)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:260)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:154)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:46)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:197)
at org.apache.commons.logging.LogAdapter$Log4jLog.<clinit>(LogAdapter.java:146)
at org.apache.commons.logging.LogAdapter$Log4jAdapter.createLog(LogAdapter.java:113)
at org.apache.commons.logging.LogAdapter.createLog(LogAdapter.java:95)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:67)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:59)
at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:203)
at com.leonardo.test.TestApplication.main(TestApplication.java:10)
2024-09-24T07:59:58.507533188Z main ERROR Null object returned for Http in Appenders.
2024-09-24T07:59:58.512017995Z main ERROR Unable to locate appender "HttpAppender" for logger config "root"
2024-09-24T07:59:58.668953038Z main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.HttpAppender for element Http: java.lang.NullPointerException: layout java.lang.NullPointerException: layout
at java.base/java.util.Objects.requireNonNull(Objects.java:259)
at org.apache.logging.log4j.core.appender.HttpAppender.<init>(HttpAppender.java:170)
at org.apache.logging.log4j.core.appender.HttpAppender.<init>(HttpAppender.java:40)
at org.apache.logging.log4j.core.appender.HttpAppender$Builder.build(HttpAppender.java:85)
at org.apache.logging.log4j.core.appender.HttpAppender$Builder.build(HttpAppender.java:46)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:124)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1164)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1085)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1077)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:681)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:264)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:313)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:631)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:713)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:735)
at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.reinitialize(Log4J2LoggingSystem.java:311)
at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithConventions(AbstractLoggingSystem.java:74)
at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:61)
at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.initialize(Log4J2LoggingSystem.java:223)
at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:332)
at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:298)
at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:246)
at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:223)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81)
at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352)
at com.leonardo.test.TestApplication.main(TestApplication.java:10)
2024-09-24T07:59:58.669561735Z main ERROR Unable to invoke factory method in class org.apache.logging.log4j.core.appender.HttpAppender for element Http: java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.HttpAppender java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.HttpAppender
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.findFactoryMethod(PluginBuilder.java:268)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:140)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1164)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1085)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1077)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:681)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:264)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:313)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:631)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:713)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:735)
at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.reinitialize(Log4J2LoggingSystem.java:311)
at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithConventions(AbstractLoggingSystem.java:74)
at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:61)
at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.initialize(Log4J2LoggingSystem.java:223)
at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:332)
at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:298)
at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:246)
at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:223)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81)
at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352)
at com.leonardo.test.TestApplication.main(TestApplication.java:10)
2024-09-24T07:59:58.670033903Z main ERROR Null object returned for Http in Appenders.
2024-09-24T07:59:58.670451268Z main ERROR Unable to locate appender "HttpAppender" for logger config "root"
This is my log4j2.xml configuration:
<Configuration>
<Appenders>
<Http name="HTTP" url="http://localhost:8055/log" verifyHostname="false" method="POST"/>
</Appenders>
<Loggers>
<Root level="INFO">
<AppenderRef ref="HTTP"/>
</Root>
</Loggers>
</Configuration>
And these are the dependencies in my pom.xml:
<properties>
<java.version>21</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
I also checked the classes in my target folder and the class public final class HttpAppender extends AbstractAppender is present.
So, is my configuration wrong or what?
I also looked into this question, but my version of log4j2 is well above 2.7.
Looking at the stacktrace there is a NullPointerException on the layout property of the HttpAppender.
2024-09-24T07:59:58.668953038Z main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.HttpAppender for element Http: java.lang.NullPointerException: layout java.lang.NullPointerException: layout
Which indicates that you need to specify the layout to use. Looking at the documentation the layout has a multiplicity of one, which is basically required (else it would have been zero or one).
Fix your configuration.
<Configuration>
<Appenders>
<Http name="HTTP" url="http://localhost:8055/log" verifyHostname="false" method="POST">
<PatternLayout pattern="%d %m%n"/>
</Http>
</Appenders>
<Loggers>
<Root level="INFO">
<AppenderRef ref="HTTP"/>
</Root>
</Loggers>
</Configuration>
Here, as in the documentation, it adds the JsonTemplateLayout.