Docs: Eclipse JDT invalid links, also how to use offline

[scscgit]

README.md section eclipse-jdt contains links:

• homepage -> I'd suggest update to https://download.eclipse.org/eclipse/downloads/ where the actual version numbers can be found
• compatible versions -> link is dead, please fix it.

By googling for the version, I actually thought this is supposed to be a reference to https://mvnrepository.com/artifact/com.diffplug.spotless/spotless-eclipse-jdt, which has version 4.8.1 (which also has major 4, so it looked similar) and is also under this package. But using eclipse("4.8.1") in Gradle causes error:

Caused by: java.lang.NumberFormatException: For input string: "8.1"
	at com.diffplug.spotless.extra.EquoBasedStepBuilder.addPlatformRepo(EquoBasedStepBuilder.java:86)

which isn't very user-friendly tbh.

Additionally, I'd like to ask you to document the behavior of these libraries. When we specify a version number, where exactly does it download and "cache" anything, i.e. can we explicitly specify Gradle dependencies for it, so that there is absolutely no API call against any live third-party domain when we build our project? And when we don't specify any version, does it use latest as defined by our Spotless plugin version, or does it actually pull the latest changes after each build, which could actually break our build (and introduce security risks)? Thanks.

Versions:
Gradle 8.9
id("com.diffplug.spotless") version "7.0.0.BETA1"
Windows 10

[nedtwigg]

The spotless-eclipse-jdt artifact is dead, we couldn't maintain compat with new Eclipse versions that way (thus it died out at 4.8.1)

• when we don't specify any version, does it use latest as defined by our Spotless plugin version
  • yes, it doesn't just grab "latest", the default is pinned within the Spotless version
• where exactly does it download and "cache" anything
  • see Embed p2 lockfiles for Eclipse JDT #1996