I was setting up API manager ELK configuration as per the document [1]. During the first step of configuring MATRICS Appender , I could not get the server started due to following error[2].
After troubleshooting with multiple product versions, i could identify that , this particular log is completely misleading and this is caused due to the spacing issue.
In the following comparison, you can see the left side has some spaces in each line which caused this issue.
If you come accross this exception, Make sure you dont have additonal spaces in appender configuration in log4j2.properties file.
Enjoy the analytics!!
[1] https://apim.docs.wso2.com/en/4.0.0/api-analytics/on-prem/elk-installation-guide/
[2]
shammijayasinghe@shammi bin % sh api-manager.sh
JAVA_HOME environment variable is set to /Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home
CARBON_HOME environment variable is set to /Users/xxx/xxx/xxx/wso2am-4.0.0
Using Java memory options: -Xms256m -Xmx1024m
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to locate plugin type for RollingFile Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to locate plugin for PatternLayout Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to locate plugin for TimeBasedTriggeringPolicy Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to locate plugin for SizeBasedTriggeringPolicy Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to locate plugin for Policies Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to locate plugin for DefaultRolloverStrategy Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to locate plugin for RollingFile Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
org.ops4j.pax.logging.pax-logging-api [log4j2] ERROR : Unable to invoke factory method in class org.apache.logging.log4j.core.config.AppendersPlugin for element Appenders: java.lang.NullPointerException Ignored FQCN: org.apache.logging.log4j.spi.AbstractLogger
java.lang.NullPointerException
at org.apache.logging.log4j.core.config.plugins.visitors.PluginElementVisitor.visit(PluginElementVisitor.java:52)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.generateParameters(PluginBuilder.java:262)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:135)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1120)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1045)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:651)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:247)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:293)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:626)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:302)
at org.ops4j.pax.logging.log4j2.internal.PaxLoggingServiceImpl.configureLog4J2(PaxLoggingServiceImpl.java:474)
at org.ops4j.pax.logging.log4j2.internal.PaxLoggingServiceImpl.updated(PaxLoggingServiceImpl.java:291)
at org.ops4j.pax.logging.log4j2.internal.Activator.start(Activator.java:164)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:842)
at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:834)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:791)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1013)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:365)
at org.eclipse.osgi.container.Module.doStart(Module.java:598)
at org.eclipse.osgi.container.Module.start(Module.java:462)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel$1.run(ModuleContainer.java:1820)
at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor$2$1.execute(EquinoxContainerAdaptor.java:150)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1813)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1770)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1735)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1661)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:345)
```
