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I need to insert, delete and update data using a xml file. I have heard of some methods like xpath, XStream or JDOM for doing this. I don’t know anything except the names of this methods for use a xml like a database. Which one is easier to learn?
Databases and XML are rather different beasts. XML is a sequential, document-centric file format, i.e. XML files can not be updated without writing the entire file back to disk. Databases on the other hand allow to efficiently insert, update and delete individual records without touching any other records.
You can not achieve that property when implementing a “database” using an XML file, so this approach will be very inefficient if you have a non-trivial amount of data, and update only a few records at a time.
That said, a relatively simple way to map data from and to XML is JAXB. A starting point might be
Chapter 17 of the Java EE 5 Tutorial. You probably have no need for a schema, and simply annotate the classes you want to write to / read from XML with JAXB annotations.