org.xml.sax.SAXParseException：cvc-complex-type.2.4.c：匹配通配符严格

Question

org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'drools:grid-node'. 

当我向 spring xml 添加网格节点和 ksession 时，出现此错误。我做了一些搜索，看起来像是一个类路径问题。我在这里缺少什么依赖项？

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:camel="http://camel.apache.org/schema/spring"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:jaxrs="http://cxf.apache.org/jaxrs"
    xmlns:drools="http://drools.org/schema/drools-spring"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://camel.apache.org/schema/spring
       http://camel.apache.org/schema/spring/camel-spring.xsd
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
       http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas
       http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
       http://drools.org/schema/drools-spring org/drools/container/spring
       http://drools.org/schema/drools-spring org/drools/container/spring/drools-spring-1.2.0.xsd">


    <drools:grid-node id="node1"/>
    <drools:ksession id="ksession1" type="stateful" kbase="kbase1" node="node1" />

我的 pom.xml 具有 Drools 的以下内容。

               <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-camel</artifactId>
        <version>${drools.version}</version>
        <exclusions>
            <!-- This ensures that we use the latest version of Spring jars and not 
                the one that comes with drools.version. -->
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring</artifactId>
            </exclusion>

            <exclusion>
                <groupId>org.apache.camel</groupId>
                <artifactId>camel-core</artifactId>
            </exclusion>

            <exclusion>
              <groupId>org.apache.camel</groupId>
              <artifactId>camel-spring</artifactId>
            </exclusion>



            <exclusion>
                <artifactId>camel-xstream</artifactId>
                <groupId>org.apache.camel</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>knowledge-api</artifactId>
        <version>${drools.version}</version>
    </dependency>

    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-core</artifactId>
        <version>${drools.version}</version>
    </dependency>


    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-compiler</artifactId>
        <version>${drools.version}</version>
    </dependency>


    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-spring</artifactId>
        <version>${drools.version}</version>
    </dependency>

Answer 1

发出此错误是因为无法找到 Drools XSD。在Drools 用户列表中的此评论中，指出 XSD 不是公开可用的，并且xsi:schemaLocationXML 中的属性将该 XSD 映射到http://drools.org/schema/drools-spring org/drools/container/spring/drools-spring-1.2.0.xsd, which doesn't resolve to the proper XSD.

Spring 应该自动处理给定xmlns:drools="http://drools.org/schema/drools-spring"属性的 XSD 解析。Drools JAR 之一应该包含一个META-INF/spring.handlers定义命名空间的 XSD 映射的文件drools。大致如下：

http://drools.org/schema/drools-spring=some.classpath.visible.package.xsdfile.xsd

它应该自动处理 Drools JAR 中包含的 XSD 文件。

尝试删除最后两行xsi:schemaLocation attribute in order to let Spring automatically resolve the XSD.

一些相关链接：

• 当没有互联网连接时 Spring schemaLocation 失败. Specially David Resnick's answer.
• Spring 参考的附录 D.5 注册处理程序和架构。

当然，您也可以从 JAR 文件中提取该 XSD，将其放置在类路径中可访问的目录中，并使用类路径相对 URLxsi:schemaLocation.

顺便说一句，这可能是复制粘贴错误，但是您的<beans> element is missing its closing tag.

编辑：看起来 Drools 没有提供spring.handlers正确的（至少截至 2010 年 12 月，请参阅Drools + Spring without internet）。您可能需要深入 JAR 来获取 XSD 并直接在xsi:schemaLocation.