mvn steps

[ERROR] Unknown lifecycle phase "build". You must specify a valid lifecycle phas
e or a goal in the format <plugin-prefix>:<goal> or <plugin-group-id>:<plugin-ar
tifact-id>[:<plugin-version>]:<goal>. Available lifecycle phases are: validate,
initialize, generate-sources, process-sources, generate-resources, process-resou
rces, compile, process-classes, generate-test-sources, process-test-sources, gen
erate-test-resources, process-test-resources, test-compile, process-test-classes
, test, prepare-package, package, pre-integration-test, integration-test, post-i
ntegration-test, verify, install, deploy, pre-clean, clean, post-clean, pre-site
, site, post-site, site-deploy. -> [Help 1]

or just simply

mvn install

The below command is used to create javadoc

mvn javadoc:javadoc