Fix typo in NodeUtils.checkReadable

3 jobs for master in 7 seconds (queued for 1 second)
Name Stage Failure
build Build
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project vospace-datamodel: Fatal error compiling: error: invalid target release: 15 -> [Help 1]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1]
ERROR: Job failed: exit code 1