{"record":{"id":"566e3dff8483e083","repo":"hibernate/hibernate-orm","slug":"not-an-entity-clsname","errorCode":null,"errorMessage":"Not an entity: ${clsName}","messagePattern":"Not an entity: (.+?)","errorType":"exception","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/JpaMetamodelImpl.java","lineNumber":282,"sourceCode":"\t\t}\n\t\treturn type;\n\t}\n\n\t@Override\n\t@Nullable\n\tpublic <X> EntityDomainType<X> findEntityType(Class<X> cls) {\n\t\treturn checkDomainType( cls, managedTypeByClass.get( cls ) )\n\t\t\t\t\tinstanceof EntityDomainType<X> entityDomainType\n\t\t\t\t? entityDomainType\n\t\t\t\t: null;\n\t}\n\n\t@Override\n\t@Nonnull\n\tpublic <X> EntityDomainType<X> entity(@Nonnull Class<X> cls) {\n\t\tfinal var entityType = findEntityType( cls );\n\t\tif ( entityType == null ) {\n\t\t\tthrow new IllegalArgumentException( \"Not an entity: \" + cls.getName() );\n\t\t}\n\t\treturn entityType;\n\t}\n\n\t@Override\n\tpublic @Nullable <X> EmbeddableDomainType<X> findEmbeddableType(Class<X> cls) {\n\t\treturn checkDomainType( cls, managedTypeByClass.get( cls ) )\n\t\t\t\t\tinstanceof EmbeddableDomainType<X> embeddableDomainType\n\t\t\t\t? embeddableDomainType\n\t\t\t\t: null;\n\t}\n\n\t@Override\n\t@Nonnull\n\tpublic <X> EmbeddableDomainType<X> embeddable(@Nonnull Class<X> cls) {\n\t\tfinal var embeddableType = findEmbeddableType( cls );\n\t\tif ( embeddableType == null ) {\n\t\t\tthrow new IllegalArgumentException( \"Not an embeddable: \" + cls.getName() );","sourceCodeStart":264,"sourceCodeEnd":300,"githubUrl":"https://github.com/hibernate/hibernate-orm/blob/fad1729dce015f908198d57a8d80274a30f905a5/hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/JpaMetamodelImpl.java#L264-L300","documentation":"Error \"Not an entity: ${clsName}\" thrown in hibernate/hibernate-orm.","triggerScenarios":"Thrown when entity() is called with a Class that is not a mapped entity class.","commonSituations":"See trigger scenarios.","solutions":["Pass an @Entity class; verify the class is mapped in this persistence unit."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"fad1729dce015f908198d57a8d80274a30f905a5","analyzedAt":"2026-08-22T04:13:57.527Z","schemaVersion":2},"datasetVersion":"2026-08-22T09:17:25.309Z"}