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In a Maven project, expand the Dependencies node. Right-click a jar and Download Sources. In my case, it hung at 25% for a while, so I decided to cancel. "Are you sure you want to cancel Downloading Sources?" -> clicked Yes. NetBeans did not remove the Downloading Sources task from the status bar... still displaying 25%. I tried to download sources for commons-validator-1.4.0.jar if that's helpful: <dependency> <groupId>commons-validator</groupId> <artifactId>commons-validator</artifactId> <version>1.4.0</version> </dependency>
the maven library performing the download (maven wagon via apache httpcommons) doesn't allow explicit cancelling of transfer, we only cancel the transport in a transfer listener by throwing exception. That's suboptimal in cases when the transfer is stuck because then we don't get any listener events.
Just updating: Still present in IDE 8.1 RC2 (Build nbms-and-javadoc-3603-on-20151013).