cvc-complex-type.2.3: Element 'beans' cannot have character [children]

当启动spring的项目时，有时候会抛如下异常：

Line 33 in XML document from ServletContext resource [/WEB-INF/backend-servlet.xml] is invalid; nested exception is org.xml.sax.SAXParseException: cvc-complex-type.2.3: Element 'beans' cannot have character [children], because the type's content type is element-only.

异常提示是spring配置文件不能正确解析。

网上搜索了一下，发现都没有给出特别明确的答案

总结了一下，发现出现这种问题时很大一部分原因都是从别处（主要是网络）复制后粘贴到配置文件中的，所以应该和复制内容的编码有关系，或者和内容中有特殊的字符有关系，如果是手工敲入则不会有问题。

另外，如果只是将出问题的行内容清除，然后在问题行上手工输入，还是会有问题，应该是问题行的编码已经乱了，所以一定要删除问题行才行，否则还是会报错的。删除问题行后，在新的行上输入则不会有问题。

所以，如果要从网络复制，可以先复制到word中，word的好处就是可以看到那些网页上看不见的特殊字符，仔细看看有没有特殊字符，将其删除后在复制到配置文件中，这样就不会有问题了。

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