Explanation

When installing XWiki using the war package and configuring Tomcat as a servlet container, there are several common warnings, errors, and configuration issues that administrators may encounter. For example:

• A generic Tomcat startup failure indicating that XWiki failed to initialize correctly: "Severe: Error listenerStart" in Logs.
• Error indicating that the operating system cannot allocate additional threads for Tomcat: "Unable to Create Native Thread" Errors on Debian Systems.
• Headless mode configuration issues.
• Large XWiki forms, Page edits, or extension operations may exceed Tomcat's default request parameter limits: Parameter Count Exceeded Allowed Maximum.
• Large authentication headers, cookies, or reverse proxy headers may exceed Tomcat defaults: Request Header is Too Large.
• Old serialized sessions may become incompatible and trigger deserialization errors during startup: Session Deserialization Errors in Tomcat.
• Tomcat may report warnings about ThreadLocal objects not being properly released when XWiki shuts down or is redeployed: ThreadLocal Memory Leak Warnings on Shutdown.

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