{"record":{"id":"7730e3929d54ba89","repo":"hibernate/hibernate-orm","slug":"entity-may-not-be-null-7730e3","errorCode":null,"errorMessage":"Entity may not be null","messagePattern":"Entity may not be null","errorType":"exception","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"hibernate-core/src/main/java/org/hibernate/event/spi/MergeEvent.java","lineNumber":41,"sourceCode":"\tprivate Object result;\n\n\tpublic MergeEvent(@Nullable String entityName, @Nonnull Object original, @Nonnull EventSource source) {\n\t\tthis(original, source);\n\t\tthis.entityName = entityName;\n\t}\n\n\tpublic MergeEvent(@Nullable String entityName, @Nonnull Object original, @Nonnull Object id, @Nonnull EventSource source) {\n\t\tthis(entityName, original, source);\n\t\tif ( id == null ) {\n\t\t\tthrow new IllegalArgumentException( \"Identifier may not be null\" );\n\t\t}\n\t\tthis.requestedId = id;\n\t}\n\n\tpublic MergeEvent(@Nonnull Object object, @Nonnull EventSource source) {\n\t\tsuper(source);\n\t\tif ( object == null ) {\n\t\t\tthrow new IllegalArgumentException( \"Entity may not be null\" );\n\t\t}\n\t\tthis.original = object;\n\t}\n\n\t@Nonnull\n\tpublic Object getOriginal() {\n\t\treturn original;\n\t}\n\n\tpublic void setOriginal(@Nonnull Object object) {\n\t\tthis.original = object;\n\t}\n\n\t@Nullable\n\tpublic Object getRequestedId() {\n\t\treturn requestedId;\n\t}\n","sourceCodeStart":23,"sourceCodeEnd":59,"githubUrl":"https://github.com/hibernate/hibernate-orm/blob/fad1729dce015f908198d57a8d80274a30f905a5/hibernate-core/src/main/java/org/hibernate/event/spi/MergeEvent.java#L23-L59","documentation":"Error \"Entity may not be null\" thrown in hibernate/hibernate-orm.","triggerScenarios":"Thrown when a caller passes a null Entity to the API guarded in MergeEvent.java:41.","commonSituations":"Typical situations: calling the method with an uninitialized variable; a lookup that returned null being passed straight through; missing null-checks in application code before invoking Hibernate.","solutions":["Check the entity argument for null before calling merge()."],"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"}