JIRA Won't Start Due to java.lang.NoClassDefFoundError org.apache.log4j.Appender | Jira

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java.lang.NoClassDefFoundError: org/apache/log4j/Appender
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
Cause
This typically happens because some classes are missing from the $JIRA_INSTALL/lib/ directory, in this case the log4j class. These classes are jar files which can be checked through file system.
Resolution
Verify if the JAR exists within the $JIRA_INSTALL/lib directory.
If not, download the JIRA version from our downloads archive (this will either be a tarball or a ZIP, depending on the OS. Do not download the installer version).
Extract it into a temporary directory and add in the missing JAR file from the downloaded archive into the $JIRA_INSTALL/lib directory.
Start Jira.

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