you are not running your eclipse instance with java8. the javafx tooling is disabled because of this.make java8 the default system java or adjust your eclipse.ini to pass -vm pointing to your java8 install. in case you want to turn off this check open your preferences and go to general > startup and shutdown and uncheck 'javafx tooling java check'

您的Eclipse实例未使用Java 8运行。由于此原因，JavaFX工具已被禁用。请将Java 8设置为默认系统Java，或调整您的eclipse.ini文件以通过-vm指向您的Java 8安装目录。如果您希望关闭此检查，请打开首选项并转到“常规>启动和关闭”，取消选中“JavaFX工具Java检查”。