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where can i download all the jars related to thingworx?
I don't know if you can download all the jar files at once, but in my case I use Java SDK and you can dowload it from ThingWorx Marketplace, the link is http://marketplace.thingworx.com/Items/java-sdk and you can find the jar files under the lib folder.
For more details you can have a look this tutorial Tutorial: Send Data to the ThingWorx Server from Java Edge SDK Programs.