Add the code to handle null pointer better in the get method.
Don't set archive false in the system metadata when a resource map is obsoleted.
For ticket https://projects.ecoinformatics.org/ecoinfo/issues/7214.Use the lastindexof and substring methods to find the deployment directory.
Change back to use URLDecoder to decode the code.
Add the code to submit index task in every methods which modified the system metadata.
Refactory the submit index methods.
Add the methods submitting the update and delete tasks.
Use the new manager class to get the messaging client.
Use a singleton class to get the messaging client.
Removed the code to initialize the index task client at the constructor.
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