The problem is found when building JAXP RI 1.4.5.
XPathLexer.java/XPathParser.java/sym.java under xml-xalan/java/src/com/sun/org/apache/xalan/internal/xsltc/compiler are not automatically generated from xpath.cup/xpath.lex.
Our customer provide their attached fix that build.xml of JAXP RI invokes the target in build.xml of Xalan.
XPathLexer.java/XPathParser.java/sym.java under xml-xalan/java/src/com/sun/org/apache/xalan/internal/xsltc/compiler are not automatically generated from xpath.cup/xpath.lex.
Our customer provide their attached fix that build.xml of JAXP RI invokes the target in build.xml of Xalan.