"jboss-ejb3.xml" validation errors in JBoss Developer Studio

Environment

• JBoss Developer Studio (JBDS)
  • 7
  • 8
  • 9
• Red Hat JBoss Enterprise Application Platform (EAP)
  • 6

Issue

We've seen xml validation errors in JBoss Developer Studio (JBDS)

- cvc-elt.1: Cannot find the declaration of element 'jboss'.

And:

Referenced file contains errors (jar:file:PATH-TO-jbdevstudio/studio/plugins/org.jboss.tools.as.catalog_a.b.c.Final-x-y-z.jar!/schema/xsd/jboss-ejb3-2_0.xsd). For more information, right click on the message in the Problems View and select "Show Details..."

Referenced file contains errors (jar:file:PATH-TO-jbdevstudio/studio/plugins/org.jboss.tools.as.catalog_a.b.c.Final-x-y-z.jar!/schema/xsd/jboss-ejb3-spec-2_0.xsd). For more information, right click on the message in the Problems View and select "Show Details..."

After clicking on "Show Details..." menu item, an window pops up with some errors:

sch-props-correct.2: A schema cannot contain two global components with the same name; this schema contains two occurrences of 'http://java.sun.com/xml/ns/javaee,...'.

like below:

Resolution

• Check and confirm xml file content
  Follow these document / example pages below to check and confirm the xml file content:

  • This content is not included.8.8.4. jboss-ejb3.xml Deployment Descriptor Reference
  • Content from docs.jboss.org is not included.jboss-ejb3.xml Reference
  • Content from github.com is not included.jboss-eap-quickstarts/ejb-multi-server

• Known issue on "jboss-ejb3.xml" validation
  There is a known issue documented in page Content from github.com is not included.Known Issues for JBoss EAP Quickstarts. And there are a few bugzilla reports This content is not included.Bug 1193543 / This content is not included.Bug 1192591 for this issue. As stated in this page, these errors can be safely ignored.

    Known Issues for JBoss EAP Quickstarts
    ......
    XML Problem: Referenced file contains errors (jar:file:PATH-TO-jbdevstudio/studio/plugins/org.jboss.tools.as.catalog_3.0.0.Final-v20141016-1911-B95.jar!/schema/xsd/jboss-ejb3-2_0.xsd). For more information, right click on the message in the Problems View and select "Show Details..."
    ......
    XML Problem: Referenced file contains errors (jar:file:/PATH-TO-jbdevstudio/studio/plugins/org.jboss.tools.as.catalog_3.0.1.Final-v20141209-0156-B106.jar!/schema/xsd/jboss-ejb3-spec-2_0.xsd). For more information, right click on the message in the Problems View and select "Show Details..."
  
    You can ignore this error. This is a known issue with the jboss-ejb3-spec-2_0.xsd schema file. See https://bugzilla.redhat.com/show_bug.cgi?id=1193543.
  

Root Cause

• "cvc-elt.1: Cannot find the declaration of element 'jboss'." error is caused by incorrect tag / elements inside the xml file.
• "Referenced file contains errors..." error message is a known issue that can be ignored safely.

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