In sprotty-server/gradle/versions.gradle a version number for lsp4j is missing. That causes the maven central release to list lsp4j version 'null' to be requested as a compile dependency. (see here.)
I don't know, which version of lsp4j you want to depend on, so I will not create an own pull request fixing this issue.
In sprotty-server/gradle/versions.gradle a version number for lsp4j is missing. That causes the maven central release to list lsp4j version 'null' to be requested as a compile dependency. (see here.) I don't know, which version of lsp4j you want to depend on, so I will not create an own pull request fixing this issue.