ColdFusion application scope variables reset unexpectedly for five primary documented reasons: the application’s idle timeout (this.applicationTimeout) expires; two Application.cfc files share the same this.name, causing them to overwrite each other's application scope; the JVM restarts due to memory exhaustion or unhandled errors; a clustered deployment maintains independent application scopes per instance with no cross-instance synchronization; and a manual or accidental applicationStop() call wipes the scope mid-session. The fix requires understanding that application scope lives in JVM memory only — it has no persistence beyond the running process.
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