Spring Boot修改最大上传文件限制:The field file exceeds its maximum permitted size of 1048576 bytes.

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Error initializing graphic environment；nested exception is java.lang.NoClassDefFoundError: Could not initialize class net.sf.jas perreports.engine.util.JRStyledTextParser

Error querying database. Cause: java.lang.NullPointerException

sun.misc.Unsafe.park(Native Method)

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Plugin Maven Helper was not installed: Cannot download，Maven Helper无法下载安装