com.atlassian.confluence.importexport.importexportException：无法完成导入，因为数据与 Confluence 架构中的约束不匹配。原因：JDBCSQL 异常：不允许空
Hi @刘志涛 and welcome,
there is some issue in the xml file. A similar error appears for duplicated key (https://confluence.atlassian.com/confkb/confluence-site-xml-import-fails-with-duplicate-key-error-438993638.html). In your case it seems that there is some item with NULL value.
Try to create again the xml file.
Fabio
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