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Looks like Nam Nguyen added the websvc.saas.api module to the enterprise cluster in #6d1b62b31817, yet it depends on a module in the xml cluster (libs.jxpath). Since there was no prior dependency between these clusters, I think this is a mistake; if intentional, it would need to be reviewed, and nbbuild/cluster.properties#nb.cluster.j2ee.depends would need to include nb.cluster.xml. It is not possible to simply remove the new module, because it is already being used by other modules.
I have removed the dependency because the usage code happen to be unused at this time due to other reasons. However, I don't know why such low level xml facility could not be part of ide cluster as other core xml modules. My module, or any modules needs to access xml documents, might need to use it in the future.
v.