{"record":{"id":"0685eedb086d9bc3","repo":"flowable/flowable-engine","slug":"empty-appsdefinitionids","errorCode":null,"errorMessage":"Empty appsDefinitionIds","messagePattern":"Empty appsDefinitionIds","errorType":"validation","errorClass":"FlowableIllegalArgumentException","httpStatus":null,"severity":"error","filePath":"modules/flowable-app-engine/src/main/java/org/flowable/app/engine/impl/repository/AppDefinitionQueryImpl.java","lineNumber":77,"sourceCode":"        super(commandContext);\n    }\n\n    public AppDefinitionQueryImpl(CommandExecutor commandExecutor) {\n        super(commandExecutor);\n    }\n\n    @Override\n    public AppDefinitionQueryImpl appDefinitionId(String appDefinitionId) {\n        this.id = appDefinitionId;\n        return this;\n    }\n\n    @Override\n    public AppDefinitionQuery appDefinitionIds(Set<String> appsDefinitionIds) {\n        if (appsDefinitionIds == null) {\n            throw new FlowableIllegalArgumentException(\"appsDefinitionIds is null\");\n        } else if (appsDefinitionIds.isEmpty()) {\n            throw new FlowableIllegalArgumentException(\"Empty appsDefinitionIds\");\n        }\n        this.ids = appsDefinitionIds;\n        return this;\n    }\n\n    @Override\n    public AppDefinitionQueryImpl appDefinitionCategory(String category) {\n        if (category == null) {\n            throw new FlowableIllegalArgumentException(\"category is null\");\n        }\n        this.category = category;\n        return this;\n    }\n\n    @Override\n    public AppDefinitionQueryImpl appDefinitionCategoryLike(String categoryLike) {\n        if (categoryLike == null) {\n            throw new FlowableIllegalArgumentException(\"categoryLike is null\");","sourceCodeStart":59,"sourceCodeEnd":95,"githubUrl":"https://github.com/flowable/flowable-engine/blob/d6d39ce1c69ff244f2d9dc6af756a9b95e865586/modules/flowable-app-engine/src/main/java/org/flowable/app/engine/impl/repository/AppDefinitionQueryImpl.java#L59-L95","documentation":"FlowableIllegalArgumentException thrown by AppDefinitionQueryImpl.appDefinitionIds when the passed Set is empty. Filtering by an empty id set is rejected because it would produce an invalid/meaningless IN() condition rather than silently matching nothing.","triggerScenarios":"Calling appDefinitionQuery.appDefinitionIds(set) with an empty HashSet — e.g. ids collected from an empty result, an empty request parameter, or a filter that matched nothing upstream.","commonSituations":"User-provided filter matched no ids; upstream service returned an empty list; batch job ran with no candidates but still built the id-filtered query.","solutions":["Guard with set.isEmpty() and skip the appDefinitionIds() call (and likely return no results directly)","Ensure the upstream id collection is populated before querying","If the intent is 'match nothing', short-circuit instead of issuing the query"],"exampleFix":"// before\nAppDefinitionQuery q = repoService.createAppDefinitionQuery().appDefinitionIds(collectedIds);\n// after\nif (collectedIds.isEmpty()) { return Collections.emptyList(); }\nAppDefinitionQuery q = repoService.createAppDefinitionQuery().appDefinitionIds(collectedIds);","handlingStrategy":"validation","validationCode":"if (ids == null || ids.isEmpty()) {\n    return Collections.emptyList(); // nothing can match an empty id set\n}\nAppDefinitionQuery q = repoService.createAppDefinitionQuery().appDefinitionIds(ids);","typeGuard":"boolean isNonEmpty(Collection<?> c) { return c != null && !c.isEmpty(); }","tryCatchPattern":null,"preventionTips":["Short-circuit on empty id sets before issuing queries","Treat 'no candidate ids' as a distinct outcome from 'filter by ids'","Validate request parameters that feed id filters"],"tags":["flowable","query","empty-collection","validation"],"backgroundTag":"empty-required-field","analyzedSha":"d6d39ce1c69ff244f2d9dc6af756a9b95e865586","analyzedAt":"2026-09-11T06:41:19.413Z","contentChangedAt":"2026-09-11T06:41:19.413Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}