How to fix Eclipse validation error “No grammar constraints detected for the document”?

Question

Eclipse 3.5.2 is throwing an XML schema warning message:

No grammar constraints (DTD or XML schema) detected for the document.

The applica

Answer 1

I had some success going back to V1.4 of application.xsd. If anyone can explain why the JavaEE version does not work, I would appreciate it.

<?xml version="1.0" encoding="UTF-8"?>
<application
  xmlns="http://java.sun.com/xml/ns/j2ee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
                      http://java.sun.com/xml/ns/j2ee/application_1_4.xsd"
  version="1.4">

Answer 2

Here's what worked for me. I was using schemas without version numbers (e.g. spring-beans.xsd, and not spring-beans-4.1.xsd) and they probably got updated upstream. I assume the problem was that Eclipse kept a dirty cache of the old versions.

Fix :
1. Go to Window -> Preference -> Network Connection -> Cache
2. Remove all cached schemas.
3. Delete all the no grammar constraints problems in problem view.
4. Re-validate the project.

Answer 3

Editing Spring context files, I found that setting explicitly the version of the XSD removes the warning:

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
        http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.1.9.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

Answer 4

It can be because of your proxy settings. See this and this. You can try attaching javadoc by URL to a library without it. If it is okay in your browser, but not in your editor, then it's a connection problem. I solved the same problem by asking the admin about the proxy settings. Although all other applications did work, eclipse didn't, so I had to enter the config "manually". It would be great if developers added a button "check connection"...

Answer 5

in eclipse to avoid the "no grammar constraints (dtd or xml schema) detected for the document." i use to add an xsd schema file to the xml catalog under

"Window \ preferences \ xml \ xml catalog \ User specified entries".

Click "Add" button on the right.

---

Example:

<?xml version="1.0" encoding="UTF-8"?>
<HolidayRequest xmlns="http://mycompany.com/hr/schemas">
    <Holiday>
        <StartDate>2006-07-03</StartDate>
        <EndDate>2006-07-07</EndDate>
    </Holiday>
    <Employee>
        <Number>42</Number>
        <FirstName>Arjen</FirstName>
        <LastName>Poutsma</LastName>
    </Employee>
</HolidayRequest>

From this xml i have generated and saved an xsd under: /home/my_user/xsd/my_xsd.xsd

As Location: /home/my_user/xsd/my_xsd.xsd

As key type: Namespace name

As key: http://mycompany.com/hr/schemas

---

Close and reopen the xml file and do some changes to violate the schema, you should be notified.

Answer 6

Here's the working solution for this problem:

Step 1: Right click on project and go to properties

Step 2: Go to 'libraries' and remove the project's ' JRE system library'

Step 3: Click on 'Add library'-->'JRE System Library' -->select 'Workspace default JRE'

Step 3: Go to 'Order and Export' and mark the newly added ' JRE system library'

Step 4: Refresh and Clean the project

Eureka! It's working :)