Caused by: org.xml.sax.SAXParseException

Spring整合ActiveMQ时，在xml配置文件中配置相关<amq:xxx/>标签时，IDE出现红色错误提示，

Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.c:
The matching wildcard is strict,
but no declaration can be found for element 'amq:broker'.

在网上搜索一下很多人出现这问题，参考了很多后，最后还是解决。

http://activemq.apache.org/schema/core

http://activemq.apache.org/schema/core/activemq-core.xsd

最终问题IDE无法读取schema文档，需要手工配置，

步骤如下：

1. Select Windows->Preferences from the Eclipse menu bar.
2. Select XML->XML Catalog from the left hand configuration tree.
3. Highlight User Specified Entries and select Add.
4. The Add XML Catalog Entry windows appears.
5. In the Location enter the path to the activemq-all jar, then add !/activemq.xsd to the end of the jar name. e.g.jssms/webapp/WEB-INF/lib/activemq-all-5.4.0.jar!/activemq.xsd

6. Under KeyType enter Namespace Name
7. and under Key enter http://activemq.apache.org/schema/core
8. then click Ok.
9. Now we need to do the same for the other name space file, so hit Add again.
10. In the Location enter the path to the activemq-all jar, then add !/activemq.xsd to the end of the jar name. e.g.jssms/webapp/WEB-INF/lib/activemq-all-5.4.0.jar!/activemq.xsd

11. Under KeyType enter Schema Location
12. and under Key enter http://activemq.apache.org/schema/core/activemq-core.xsd