Java Home: /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home

> Could not target platform: 'Java SE 11' using tool chain: 'JDK 8 (1.8)'.

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• Spring Tool Suite 4 > Preferences

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• プロジェクト名を右クリック > Debug As > Debug Configurations...
• Spring Boot App > プロジェクト名
• JRE > Project execution environment

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• 同 > Environment > Environment variables to set
• JAVA_HOME

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