weblogic.management.DeploymentException: Deployment could not be created. Deployment creator is null.
Message icon - Warning Errors were encountered while performing this operation.
Any information on what a deployment creator is and why is it not recognizing the deployment of a simple war file would be welcomed.
This bug manifests itself if the application being deployed fails initial activation ("activation" of the configuration changes in the admin console). For example, if you've forgot to configure required datasources etc. and application didn't start with some error because of it.
If you see "deployment creator is null" the only remaining option is to remove the application and deploy it again. Fixing configuration without redeploying application won't help.
Once the app started successfully, "deployment creator" won't harass you anymore.
You can see the source of the failure (why the app failed to start) by looking in the server logs. Or, if deploying in Eclipse, look at the Console Eclipse=>Console=>"Oracle Weblogic Server at localhost".
来源：https://stackoverflow.com/questions/11864150/weblogic-12-c-deployment-could-not-be-created-deployment-creator-is-null