{"record":{"id":"7c0c81f466a2fe6c","repo":"hibernate/hibernate-orm","slug":"unknown-transaction-isolation-level","errorCode":null,"errorMessage":"Unknown transaction isolation level: '{}'","messagePattern":"Unknown transaction isolation level: '(.+?)'","errorType":"exception","errorClass":"ConnectionProviderConfigurationException","httpStatus":null,"severity":"error","filePath":"hibernate-core/src/main/java/org/hibernate/engine/jdbc/connections/internal/ConnectionProviderInitiator.java","lineNumber":355,"sourceCode":"\t\t\treturn isolationLevel;\n\t\t}\n\t\telse {\n\t\t\tfinal String string = setting.toString();\n\t\t\tif ( isBlank( string ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\telse if ( ISOLATION_VALUE_MAP.containsKey( string ) ) {\n\t\t\t\treturn ISOLATION_VALUE_MAP.get( string );\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// it could be a String representation of the isolation numeric value\n\t\t\t\ttry {\n\t\t\t\t\tfinal int isolationLevel = parseInt( string );\n\t\t\t\t\tcheckIsolationLevel( isolationLevel );\n\t\t\t\t\treturn isolationLevel;\n\t\t\t\t}\n\t\t\t\tcatch (NumberFormatException ignore) {\n\t\t\t\t\tthrow new ConnectionProviderConfigurationException( \"Unknown transaction isolation level: '\" + string + \"'\" );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate static void checkIsolationLevel(int isolationLevel) {\n\t\tif ( !ISOLATION_VALUE_CONSTANT_NAME_MAP.containsKey( isolationLevel ) ) {\n\t\t\tthrow new ConnectionProviderConfigurationException( \"Unknown transaction isolation level: \" + isolationLevel );\n\t\t}\n\t}\n\n\t/**\n\t * Gets the {@link Connection} constant name corresponding to the given isolation.\n\t *\n\t * @param isolation The transaction isolation numeric value.\n\t *\n\t * @return The corresponding Connection constant name.\n\t *","sourceCodeStart":337,"sourceCodeEnd":373,"githubUrl":"https://github.com/hibernate/hibernate-orm/blob/fad1729dce015f908198d57a8d80274a30f905a5/hibernate-core/src/main/java/org/hibernate/engine/jdbc/connections/internal/ConnectionProviderInitiator.java#L337-L373","documentation":"Error \"Unknown transaction isolation level: '{}'\" thrown in hibernate/hibernate-orm.","triggerScenarios":"Thrown at hibernate-core/src/main/java/org/hibernate/engine/jdbc/connections/internal/ConnectionProviderInitiator.java:355 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Use a valid transaction isolation level name or constant (READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE) for 'hibernate.connection.isolation'","Correct the isolation level value in the configuration"],"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"}