The javac compiler was changed recently to omit warnings when when hashCode or equals is overridden but not both. This has resulted in a lot of new warnings in the new build and makes it really hard to see real errors when re-building.

Here's what we get for org.jcp.xml.dsig.internal.dom

warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMX509IssuerSerial
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMReference
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMTransform
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMKeyInfo
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMX509Data
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMXMLSignature.DOMSignatureValue
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMXMLSignature
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMSignatureProperty
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMCanonicalizationMethod
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMSignatureMethod
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMSignedInfo
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMRetrievalMethod
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMSignatureProperties
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMManifest
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMXMLObject
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMKeyName
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMDigestMethod
  overrides method equals but does not overrides method hashCode from Object
warning: [overrides] Class org.jcp.xml.dsig.internal.dom.DOMKeyValue
  overrides method equals but does not overrides method hashCode from Object