Below we describe what the various log levels of the runtime will show as output. During development, these log levels can be set in the console (advanced -> set log levels), when deployed on a server, please refer to the Deployment pages.
2 Log Levels
Critical is reserved for rare cases where the application may not be able to function reliably anymore. This should normally not occur. If it does, you should immediately take action. The 3.0 cloud treats these messages as alerts and will notify you on the cloud dashboard.
Error is used to log all unhandled exceptions. These are unexpected events that should not occur, but are not critical. The application should be able to function normally afterwards.
Warning is often used for handled ‘exceptions’ or other important log events. For example, if your application requires a configuration setting but has a default in case the setting is missing, then the Warning level should be used to log the missing configuration setting.
The Information level is typically used to output information that is useful to the running and management of your system. Information would also be the level used to log entry and exit points in key areas of your application. However, you may choose to add more entry and exit points at Debug level for more granularity during development and testing.
This should be used for debugging systems during development, but never in a production system. It can be used to easily pinpoint problems and the general flow of your application.
This is the most verbose logging level, and can be used if you want even more fine-grained logging than debug.
3 Log Nodes
This section provides some details on specific log nodes used by Mendix. It is recommended that if you write your own log messages you use your own log node names to avoid confusion with the Mendix log messages.
3.1 Default Mendix Log Nodes
The following log nodes are used by Mendix when writing log messages.
This list is currently incomplete and is being worked on.
|ActionManager||Log messages related to action scheduling (for example, scheduled events) and action execution (for example, running microflows).|
|Configuration||Logging related to the configuration of the Mendix app that is read in at startup.|
|ConnectionBus||General logging related to database startup, synchronization and connections management for Mendix.|
|ConnectionBus_Mapping||Information relating to the translations of XPath Queries and OQL text queries to OQL Queries.|
|ConnectionBus_Queries||Deprecated: This is a legacy node.|
|ConnectionBus_Retrieve||All information related to the retrieval of data, such as: Incoming requests from the application, the executed statement. Also logs issues encountered during the processing of the received data.|
|ConnectionBus_Security||Information regarding access rights needed to access the database.|
|ConnectionBus_Synchronize||Deprecated: This is a legacy node.|
|ConnectionBus_Update||All information related to the update of data in the database. Incoming storage requests, the executed statements and issues encountered during storage.|
|ConnectionBus_Validation||Information related modification of the existing database, and database migration.|
|Core||Logs messages from the core runtime. This can be startup of the runtime, version of the runtime, license being used and issues related to interpreting the model.|
|DataStorage_QueryHandling||Logs messages related to the queries that are being executed.|
|DataStorage_QueryPlan||Query execution plan information for installations (currently only supported for PostgreSQL databases).|
|DocumentExporter||Logs messages related to the templating engine that generates documents.|
|FileDocumentSizesPopulateJob||Logs messages for a background job that populates the file-size field in the database for documents that do not have that field filled (used during legacy migration).|
|I18NProcessor||Logs messages related to translation of the app.|
|JSON||JSON messages from the Mendix Client to the Runtime Server. See JSON, below, for more information|
|Jetty||Logs messages from the internal Jetty webserver that handles HTTP requests between the runtime and the outside world.|
|LocalFileSystemStore||Logs messages related to file handling if you are using local file system as your file store.|
|Logging||Logs messages related to the logging framework used by Mendix.|
|M2EE||Log messages from the administration interface with the runtime|
|MicroflowDebugger||Log messages related to the status of the microflow debugger, for example, connection status, incoming and outgoing requests, etc.|
|MicroflowEngine||Log messages related to microflow execution, for example, which microflow / microflow action is being executed and errors that occur during the execution.|
|Module||Logs messages for modules that are loaded on-demand in the core runtime like the microflow-engine.|
|ObjectManagement||Logs errors relating to attempts to make associations to non-existent object|
|OData Publish||Log messages related to published OData services.|
|QueryParser||Logs messages related to the parsing or interpretation of XPath and OQL queries.|
|Queue||All actions related to Task Queues|
|REST Publish||Log messages related to published REST services.|
|StorageAzure||Logs messages related to file handling if you are using Azure system as your file store.|
|StorageS3||Logs messages related to file handling if you are using Amazon S3 system as your file store.|
|WebServices||Traces SOAP call request and response contents.|
|Workflow Engine||Logs messages related to workflow executions, for example, lifecycle events, such as a start or an end of a workflow, execution of workflow actions, and errors that occur during the execution.|
Has only one relevant level: Debug.
Setting this log level to debug will show you all the JSON requests and responses from the Mendix Client to the Runtime Server. This may degrade performance as this output is normally streamed. This can also be used to gain insight in what users are doing in a production environment. When using it here, make sure you have enough disk space available for your log files though.