如果计算机未连接到Internet，则Liquibase失败 [英] Liquibase fails if computer is not connected to internet

问题描述

当我尝试启动Liquibase(使用Karaf)时，出现以下错误

When I am trying to start Liquibase (Karaf is used), I get the following error

'无法读取架构文档 http://www.liquibase .org/xml/ns/dbchangelog/dbchangelog-3.0.xml ，因为1)找不到文档； 2)无法读取文件； 3)文档的根元素不是'

'Failed to read schema document http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xml, bacause 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not '

如果计算机连接到Internet，则不会重现此错误.

If computer is connected to internet, this error is not reproduced.

推荐答案

我最近偶然发现了这个问题.

I stumbled across this myself recently.

您需要更改此内容:

<databaseChangeLog
    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd">

并删除XSD的URL:

and remove the URL to the XSD:

<databaseChangeLog
    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog dbchangelog-3.0.xsd">

请注意http://www.liquibase.org/xml/ns/dbchangelog和dbchangelog-3.0.xsd之间的空格.第一个元素是名称空间的URI，第二个元素指向实际的XSD文件.如果其中不包含URL，则XML解析器将尝试使用本地文件.

Note the space between http://www.liquibase.org/xml/ns/dbchangelog and dbchangelog-3.0.xsd. The first element is the URI for the namespace, the second element points to the actual XSD file. If that doesn't include a URL, the XML parser will try to use a local file.

然后将实际的XSD放入更改日志XML所在的目录中.

Then put the actual XSD into the same directory where the changelog XML is located.

您需要从具有互联网访问权限的计算机下载该文件，例如使用:

You need to download that from a computer with internet access of course, e.g. using:

wget http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd

或通过使用浏览器简单地打开URL，然后保存文件.

or by simply opening the URL with the browser and then saving the file.

请注意，您还需要为架构位置指定一个 .xsd 文件，而不是.xml(如问题所示).

Note that you also need to specify a .xsd file for the schema location, not a .xml (as it is shown in the question).

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