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Support Article

Error occurs when downgrading using Reversal script

SA-107541

Summary



Error occurs when downgrading Pega Platform 8.3.2 to Pega Platform 8.2.5 using the Reversal script (reverse.sh).
User is utilizing MSSQLDB and the application server is JBoss EAP 7X.



Error Messages



org.xml.sax.SAXParseException; lineNumber: 14542; columnNumber: 21; cvc-complex-type.4: Attribute 'name' must appear on element 'pega:viewGroup'.
     [java]     at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
     [java]     at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
     [java]     at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
     [java]     at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
     [java]     at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
     [java]     at org.apache.xerces.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(Unknown Source)
     [java]     at org.apache.xerces.impl.xs.XMLSchemaValidator.reportSchemaError(Unknown Source)
     [java]     at org.apache.xerces.impl.xs.XMLSchemaValidator.addDefaultAttributes(Unknown Source)
     [java]     at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)
     [java]     at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
     [java]     at org.apache.xerces.xinclude.XIncludeHandler.startElement(Unknown Source)
     [java]     at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
     [java]     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
     [java]     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
     [java]     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     [java]     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     [java]     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
     [java]     at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
     [java]     at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
     [java]     at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121)
     [java]     at com.pega.pegarules.data.ddl.SchemaManager.createDomDocumentFromXmlInputStream(SchemaManager.java:258)
     [java]     at com.pega.pegarules.data.ddl.SchemaManager.<init>(SchemaManager.java:430)
     [java]     at com.pega.pegarules.data.ddl.SchemaManager.<init>(SchemaManager.java:250)
     [java]     at com.pega.pegarules.data.ddl.SchemaGenerator.getCustomSchemaManager(SchemaGenerator.java:2057)
     [java]     at com.pega.pegarules.data.ddl.SchemaGenerator.validateSchemaFile(SchemaGenerator.java:1964)
     [java]     at com.pega.pegarules.data.ddl.SchemaGenerator.getReversalSchemaManager(SchemaGenerator.java:1923)
     [java]     at com.pega.pegarules.data.ddl.SchemaGenerator.handleReverseAction(SchemaGenerator.java:1626)
     [java]     at com.pega.pegarules.data.ddl.SchemaGenerator.main(SchemaGenerator.java:1548)



Steps to Reproduce



Perform a single schema Out-Of-Place upgrade from Pega Platform 8.2.5 to Pega Platform 8.3.2.


Root Cause



The limitation of the Reverse Upgrade is that the single schema upgrade does not support Reverse Upgrade.


Resolution



Here’s the explanation for the reported behavior:

The limitations of the Reverse Upgrade are:
  1. In-place upgrades
  2. Single-schema systems
  3. Multi-tenancy systems
  4. Multi-hop upgrades:

    For example,

            The user can,

                - Upgrade from Pega Platform 7.2 to Pega Platform 8.1.
                - Reverse the upgrade to return Pega Platform 7.2.

            The user cannot:

                - Upgrade from Pega Platform 7.2 to Pega Platform 7.4 (first hop).
                - Upgrade again from Pega Platform 7.4 to Pega Platform 8.1 (second hop).
                - Reverse the upgrade to Pega Platform 7.2.
Since In-Place upgrade is performed, Reverse upgrade is not supported.

The user must perform the Out-of-Place upgrade.
Suggest Edit

Published July 8, 2020 - Updated December 2, 2021

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