Error 'Cannot invoke "java.util.Map.keySet()" because "this.fImportSourceFields" is null' in SN

[Nikhil63]

Hi All,

i am getting the 'Cannot invoke "java.util.Map.keySet()" because "this.fImportSourceFields" is null' error in the data source.

Could you please help me with this? I am not sure if it is something related to SN or not and what I need to do here.

[frank121]

This is what worked for me, thank you.

[Sayali_Suryawan]

The error message "Cannot invoke 'java.util.Map.keySet()' because 'this.fImportSourceFields' is null" typically indicates that the fImportSourceFields object is expected to be a non-null map but is null at runtime. This issue often arises during data imports or integrations, such as when using JDBC connections or Service Graph Connectors.

Common Causes and Solutions

1. JDBC Connection Issues
   A common cause is a failure in the JDBC connection, which prevents the system from retrieving the necessary metadata. To address this:

   • Verify Credentials: Ensure that the database credentials are correct and have the necessary permissions.

   • Check Connectivity: Confirm that the MID Server can connect to the database without firewall or network issues.

   • Review MID Server Logs: Examine the MID Server logs for any SQL errors or connection issues.

   • Revalidate MID Server: Navigate to MID Server > Servers, select the relevant MID Server, and use the Invalidate, Rekey, and Validate options to reset its configuration. 

2. Missing or Incorrect Data Source Configuration
   If the data source configuration is incomplete or incorrect, it can lead to this error. Ensure that:

   • Field Mappings: All required fields are correctly mapped between the source and target tables.

   • Data Source Settings: The data source settings, such as authentication methods, are properly configured.

3. Service Graph Connector Issues
   For integrations using Service Graph Connectors, ensure that:

   • Connector Updates: The Service Graph Connector is up to date.

   • Integrated Authentication: If using Windows authentication, set the Use integrated authentication field to true in the data source record. 

4. Database Schema Changes
   Changes in the database schema, such as missing tables or columns, can cause this error. To resolve this:

   • Verify Schema: Ensure that the database schema matches the expected structure.

   • Check Permissions: Confirm that the database user has the necessary permissions to access all required tables and columns.

If the issue persists after trying these solutions, consider reaching out to ServiceNow Support for further assistance.


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Thank you.