Resolving the "com.fasterxml.jackson.core" packages not found issue, when enabling the JSON format logs.

[janithcmw]

In default behaviour, when the JSON log format is enabled with the following configurations in the "log4j2.xml" file, the below exception can be observed.
Configuration

<Configuration>
    <Appenders>
        <Console name="CARBON_CONSOLE" target="SYSTEM_OUT">
          <JSONLayout compact="true" eventEol="true"/>
        </Console>
...
...
...

Exception

SEVERE {org.wso2.carbon.launcher.Main main} - Exception in org.ops4j.pax.logging.log4j2.internal.Activator.start() of bundle org.ops4j.pax.logging.pax-logging-log4j2. 
java.lang.RuntimeException: Exception in org.ops4j.pax.logging.log4j2.internal.Activator.start() of bundle org.ops4j.pax.logging.pax-logging-log4j2.
	at org.wso2.carbon.launcher.CarbonServer.start(CarbonServer.java:94)
	at org.wso2.carbon.launcher.Main.main(Main.java:84)
Caused by: org.osgi.framework.BundleException: Exception in org.ops4j.pax.logging.log4j2.internal.Activator.start() of bundle org.ops4j.pax.logging.pax-logging-log4j2.
	at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:795)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:724)
	at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:932)
	at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:309)
	at org.eclipse.osgi.container.Module.doStart(Module.java:581)
	at org.eclipse.osgi.container.Module.start(Module.java:449)
	at org.eclipse.osgi.internal.framework.EquinoxBundle.start(EquinoxBundle.java:383)
	at org.eclipse.osgi.internal.framework.EquinoxBundle.start(EquinoxBundle.java:402)
	at org.wso2.carbon.launcher.CarbonServer.loadInitialBundles(CarbonServer.java:242)
	at org.wso2.carbon.launcher.CarbonServer.start(CarbonServer.java:83)
	... 1 more
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ser/FilterProvider
	at org.apache.logging.log4j.core.layout.JsonLayout.<init>(JsonLayout.java:896)
	at org.apache.logging.log4j.core.layout.JsonLayout$Builder.build(JsonLayout.java:839)
	at org.apache.logging.log4j.core.layout.JsonLayout$Builder.build(JsonLayout.java:813)
	at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:122)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:952)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:892)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:884)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:884)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:508)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:232)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:244)
	at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:545)
	at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:261)
	at org.ops4j.pax.logging.log4j2.internal.PaxLoggingServiceImpl.doUpdate(PaxLoggingServiceImpl.java:209)
	at org.ops4j.pax.logging.log4j2.internal.PaxLoggingServiceImpl.updated(PaxLoggingServiceImpl.java:154)
	at org.ops4j.pax.logging.log4j2.internal.Activator.start(Activator.java:152)
	at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:774)
	at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:767)
	... 10 more
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ser.FilterProvider cannot be found by org.ops4j.pax.logging.pax-logging-log4j2_1.10.0
	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:448)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:361)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:353)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:161)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 30 more

The possible cause for this issue is the bundle "org.ops4j.pax.logging.pax-logging-log4j2_1.10.0" has been launched before launching the bundle which contains the "com.fasterxml.jackson.databind.ser.FilterProvide" method.
As solution the following entries were made in the "launch.properties" file(resides in /conf//osgi directory) and changed the bundle launching order.

carbon.initial.osgi.bundles=\
  file\:plugins/com.fasterxml.jackson.core.jackson-core_2.9.6.jar@1\:true,\
  file\:plugins/com.fasterxml.jackson.core.jackson-annotations_2.9.6.jar@1\:true,\
  file\:plugins/com.fasterxml.jackson.core.jackson-databind_2.9.6.jar@1\:true 

So shall we appy the bundle launching order as above as an improvement to the product?

[janithcmw]

Location of the "launch.properties" should be - [SP-Home/conf/profile_name/osgi directory]