초등교과 맞춤형 민속콘텐츠 온라인 시스템

[error log]

Caused by: java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_432]
        at java.lang.Class.forName(Class.java:264) ~[?:1.8.0_432]
        at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:103) ~[?:1.8.0_432]
        at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:82) ~[?:1.8.0_432]
        at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1181) ~[?:1.8.0_432]
        at java.awt.image.BufferedImage.getGraphics(BufferedImage.java:1170) ~[?:1.8.0_432]
        at com.stoneitgt.util.FileUtil.scaleImage(FileUtil.java:507) ~[nfk_elecontents_core-1.0.jar:?]
        at com.stoneitgt.util.FileUtil.createThumbnail(FileUtil.java:464) ~[nfk_elecontents_core-1.0.jar:?]
        at com.stoneitgt.admin.services.FilesService.makeThumbnail(FilesService.java:210) ~[classes/:?]
        at com.stoneitgt.admin.services.FilesService.saveFiles(FilesService.java:123) ~[classes/:?]
        at com.stoneitgt.admin.services.FilesService.saveFiles(FilesService.java:95) ~[classes/:?]
        at com.stoneitgt.admin.services.FilesService$$FastClassBySpringCGLIB$$8a1dcab1.invoke(<generated>) ~[classes/:?]