No goals have been specified for this build. You must specif

• Maven の No goals have been specified for this build
• 原因: mvn 単体実行でゴール（phase）が指定されていない
• 対処: mvn package / mvn install / mvn compile 等のゴールを明示する
• Eclipse 連携時はビルド構成側で Goals フィールドが空になっている可能性

[ERROR] No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in the format : or :[:]:. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-clean, clean, post-clean, pre-site, site, post-site, site-deploy. -> [Help 1]