Persisting unexplained errors when parsing XML with schema validation

Question

Hi,
I am trying to parse an XML file including XML schema validation. When I validate my .xml and .xsd in NetBeans 5.5 beta, I get not error. When I parse my XML in Java, I systematically get the following errors no matter what I try:
i) Document root element "SQL_STATEMENT_LIST", must match DOCTYPE root "null".
ii) Document is invalid: no grammar found.
The code I use is the following:
try {
Document document;
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(true);
factory.setNamespaceAware(true);
DocumentBuilder builder = factory.newDocumentBuilder();
document = builder.parse( new File(PathToXml) );
My XML is:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<!-- Defining the SQL_STATEMENT_LIST element -->
<xs:element name="SQL_STATEMENT_LIST" type= "SQL_STATEMENT_ITEM"/>
<xs:complexType name="SQL_STATEMENT_ITEM">
<xs:sequence>
<xs:element name="SQL_SCRIPT" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<!-- Defining simple type ApplicationType with 3 possible values -->
<xs:simpleType name="ApplicationType">
<xs:restriction base="xs:string">
<xs:enumeration value="DawningStreams"/>
<xs:enumeration value="BaseResilience"/>
<xs:enumeration value="BackBone"/>
</xs:restriction>
</xs:simpleType>
<!-- Defining the SQL_SCRIPT element -->
<xs:element name="SQL_SCRIPT" type= "SQL_STATEMENT"/>
<xs:complexType name="SQL_STATEMENT">
<xs:sequence>
<xs:element name="NAME" type="xs:string"/>
<xs:element name="TYPE" type="xs:string"/>
<xs:element name="APPLICATION" type="ApplicationType"/>
<xs:element name="SCRIPT" type="xs:string"/>
<!-- Making sure the following element can occurs any number of times -->
<xs:element name="FOLLOWS" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
and my XML is:
<?xml version="1.0" encoding="UTF-8"?>
<!--
Document : SQLStatements.xml
Created on : 1 juillet 2006, 15:08
Author : J�r�me Verstrynge
Description:
Purpose of the document follows.
-->
<SQL_STATEMENT_LIST xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://www.dawningstreams.com/XML-Schemas/SQLStatements.xsd">
<SQL_SCRIPT>
<NAME>CREATE_PEERS_TABLE</NAME>
<TYPE>CREATION</TYPE>
<APPLICATION>DawningStreams</APPLICATION>
<SCRIPT>
CREATE CACHED TABLE PEERS (
PEER_ID           VARCHAR(20) NOT NULL,
PEER_KNOWN_AS      VARCHAR(30) DEFAULT ' ' ,
PRIMARY KEY ( PEER_ID )
</SCRIPT>
</SQL_SCRIPT>
<SQL_SCRIPT>
<NAME>CREATE_COMMUNITIES_TABLE</NAME>
<TYPE>CREATION</TYPE>
<APPLICATION>DawningStreams</APPLICATION>
<SCRIPT>
CREATE CACHED TABLE COMMUNITIES (
COMMUNITY_ID VARCHAR(20) NOT NULL,
COMMUNITY_KNOWN_AS VARCHAR(25) DEFAULT ' ',
PRIMARY KEY ( COMMUNITY_ID )
</SCRIPT>
</SQL_SCRIPT>
<SQL_SCRIPT>
<NAME>CREATE_COMMUNITY_MEMBERS_TABLE</NAME>
<TYPE>CREATION</TYPE>
<APPLICATION>DawningStreams</APPLICATION>
<SCRIPT>
CREATE CACHED TABLE COMMUNITY_MEMBERS (
COMMUNITY_ID VARCHAR(20) NOT NULL,
PEER_ID VARCHAR(20) NOT NULL,
PRIMARY KEY ( COMMUNITY_ID, PEER_ID )
</SCRIPT>
</SQL_SCRIPT>
<SQL_SCRIPT>
<NAME>DROP_PEER_TABLE</NAME>
<TYPE>DELETION</TYPE>
<APPLICATION>DawningStreams</APPLICATION>
<SCRIPT>
DROP TABLE PEERS IF EXISTS
</SCRIPT>
</SQL_SCRIPT>
<SQL_SCRIPT>
<NAME>DROP_COMMUNITIES_TABLE</NAME>
<TYPE>DELETION</TYPE>
<APPLICATION>DawningStreams</APPLICATION>
<SCRIPT>
DROP TABLE COMMUNITIES IF EXISTS
</SCRIPT>
</SQL_SCRIPT>
<SQL_SCRIPT>
<NAME>DROP_COMMUNITY_MEMBERS_TABLE</NAME>
<TYPE>DELETION</TYPE>
<APPLICATION>DawningStreams</APPLICATION>
<SCRIPT>
DROP TABLE COMMUNITY_MEMBERS IF EXISTS
</SCRIPT>
</SQL_SCRIPT>
<SQL_SCRIPT>
<NAME>CREATE_COMMUNITY_MEMBERS_VIEW</NAME>
<TYPE>CREATION</TYPE>
<APPLICATION>DawningStreams</APPLICATION>
<SCRIPT>
CREATE VIEW COMMUNITY_MEMBERS_VW AS
SELECT P.PEER_ID, P.PEER_KNOWN_AS, C.COMMUNITY_ID, C.COMMUNITY_KNOWN_AS
FROM PEERS P, COMMUNITIES C, COMMUNITY_MEMBERS CM
WHERE P.PEER_ID = CM.PEER_ID
AND C.COMMUNITY_ID = CM.COMMUNITY_ID
</SCRIPT>
<FOLLOWS>CREATE_PEERS_TABLE</FOLLOWS>
<FOLLOWS>CREATE_COMMUNITIES_TABLE</FOLLOWS>
</SQL_SCRIPT>
</SQL_STATEMENT_LIST>
Any ideas? Thanks !!!
J�r�me Verstrynge

Answer 1

Hi,
I found the solution in the following post:
Validate xml with DOM - no grammar found
Sep 17, 2003 10:58 AM
The solution is to add a line of code when parsing:
try {
Document document;
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(true);
factory.setNamespaceAware(true);
factory.setAttribute("http://java.sun.com/xml/jaxp/properties/schemaLanguage", "http://www.w3.org/2001/XMLSchema");
DocumentBuilder builder = factory.newDocumentBuilder();
document = builder.parse( new File(PathToXml) );
The errors are gone !!!
J�r�me Verstrynge