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COMADMIN_E_APPLICATIONEXISTS
COM+ catalog object and collection state: exact meaning of COMADMIN_E_APPLICATIONEXISTS
The target COM+ application name or identifier already exists. Application creation or package installation attempts to create an application that collides with an installed catalog object.
Windows describes this condition as “The application is already installed”.
Evidence to collect before repair
- Record collection name, parent key, object key, and application/partition ID.
- Preserve the exact administration method and pending property values; it anchors the failure to the real administration object.
- Evidence should include ErrorInfo entries and COM+ System Application events, captured before a repair changes state.
Where the result occurs
The authoritative state is the logical COM+ catalog exposed through COMAdmin collections, not a single registry key or an old in-memory object. In the specific case of this result, resolve both application name and AppID because a friendly-name check alone may miss the actual collision.
Diagnostic sequence
- To isolate this result, recreate the catalog session and repopulate the relevant hierarchy.
- resolve objects by stable identifiers rather than display names.
- compare pending values with collection property metadata.
- The next diagnostic action is to save the smallest coherent change set and inspect ErrorInfo.
- To isolate it, verify the committed object by repopulating after SaveChanges.
Retry and recovery
Choose an explicit update path, uninstall the confirmed obsolete application, or assign a new identity; do not append random names automatically.
Practical administration scenario
A package is installed twice with the same AppID, and COM+ rejects the second application creation.
Difference from nearby COMADMIN results
COMADMIN_E_OBJECTEXISTS is broader, while this code establishes that the conflicting object is an application.
Official Microsoft references
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