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Nuclos rule API classes: QueryProvider, BusinessObjectProvider, provider overview, business object classes, api.nuclos.de.

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light bulb Supporting classes

Overview of the provider and helper classes of the Nuclos rule API.

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titleKonzept
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titleDeveloper
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titleUpdated: Jul 2026
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titleapplies to Nuclos 4.2026.x

Supporting classes of the rule API

For clear rule programming, the Nuclos API provides several provider and helper classes. Within a rule, Nuclos data is available as business objects – generated Java classes whose attributes match the business object's fields (e.g. „order“ becomes the class Order).

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titleAPI documentation

Full API reference: api.nuclos.de.

Providers at a glance

ClassPurpose
QueryProviderQuery data in a typed way.
BusinessObjectProviderCreate/update/delete BOs.
DatasourceProviderRun data sources.
GenerationProviderRun generation steps.
PrintoutProviderCreate forms.
ReportProviderCreate reports.
MailProviderSend/receive e-mails.
FileProviderPrint/save files.
ImportProviderRun data imports.
ParameterProviderRead system/nuclet parameters.
StatemodelProviderTrigger state changes.

Related pages

open book Server-side rules

Rules.

Open →

gear QueryProvider

Load data.

Open →

gear BusinessObjectProvider

Write BOs.

Open →