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https://issues.apache.org/jira/browse/OPENJPA-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16872451#comment-16872451
 ] 

Francesco Chicchiriccò commented on OPENJPA-2791:
-------------------------------------------------

This (more close to OpenJPA's {{XMLMetaDataParser}}) is also working fine:

{code}
        SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
        saxParserFactory.setNamespaceAware(true);
        saxParserFactory.setValidating(true);

        SAXParser parser = saxParserFactory.newSAXParser();
        parser.setProperty(
                "http://java.sun.com/xml/jaxp/properties/schemaLanguage";,
                "http://www.w3.org/2001/XMLSchema";);
        parser.setProperty(
                "http://java.sun.com/xml/jaxp/properties/schemaSource";,
                
"https://www.oracle.com/webfolder/technetwork/jsc/xml/ns/persistence/persistence_2_1.xsd";);

        parser.parse(App.class.getResourceAsStream("/persistence.xml"), new 
DefaultHandler() {

            @Override
            public void error(final SAXParseException e) throws SAXException {
                throw e;
            }
        });
{code}

while putting

{code}
https://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd
{code}

raises again the exception as above.

> Parsing persistence.xml throws premature end of file error
> ----------------------------------------------------------
>
>                 Key: OPENJPA-2791
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2791
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: build / infrastructure, jpa
>    Affects Versions: 2.4.3
>         Environment: Linux Ubuntu 18.04
>            Reporter: Robert F. Peake
>            Priority: Major
>              Labels: build
>
> XMLMetaDataParser in org.apache.openjpa.lib.meta uses the SaxParser to read 
> persistence.xml. Just within the last few days, it has begun to throw this 
> error:
> {quote}org.xml.sax.SAXException: 
> [file:/home/robert/git/sccdata/target/classes/META-INF/persistence.xml|file:///home/robert/git/sccdata/target/classes/META-INF/persistence.xml]
>  [Location: Line: 5, C: 64]: org.xml.sax.SAXParseException; systemId: 
> [http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd]; lineNumber: 1; 
> columnNumber: 1; Premature end of file.
> {quote}
> Resorting to XML Copy Editor to validate the schema shows the error actually 
> involved: Fatal Error at line 0, column 0: unsupported protocol in URL. It 
> seems that Oracle's web site has switched from HTTP to HTTPS, which is a 
> protocol that parser cannot handle, as explained in this post:
> {color:#000000}[article|[https://knowledgebase.progress.com/articles/Article/Unsupported-protocol-in-URL-reading-XML-from-a-URI].]{color}
> {color:#000000} {color}
> {color:#000000}The problem has been reported elsewhere [Stack 
> Overflow|https://stackoverflow.com/questions/56728487/org-xml-sax-saxparseexceptionpublicid-http-xmlns-jcp-org-xml-ns-persistence-p/56741356#56741356].{color}
>  



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