Program: 91926
Project: 91926
Buggy source:
/** 
 * Parses a   {@code "FITTED_CS"} element.This element has the following pattern: {@preformat textFITTED_CS["<name>", <to base>, <base cs>]}
 * @param mode {@link #FIRST},   {@link #OPTIONAL} or {@link #MANDATORY}.
 * @param parent The parent element.
 * @return The {@code "FITTED_CS"} element as a {@link CompoundCRS} object.
 * @throws ParseException if the {@code "COMPD_CS"} element can not be parsed.
 */
private DerivedCRS parseFittedCS(final int mode,final Element parent) throws ParseException {
  final Element element=parent.pullElement(mode,WKTKeywords.Fitted_CS);
  if (element == null) {
    return null;
  }
  final String name=element.pullString("String_Node_Str");
  final MathTransform toBase=parseMathTransform(element,true);
  final OperationMethod method=getOperationMethod();
  final CoordinateReferenceSystem baseCRS=parseCoordinateReferenceSystem(element,true);
  if (!(baseCRS instanceof SingleCRS)) {
    throw new LocalizedParseException(errorLocale,Errors.Keys.UnexpectedValueInElement_2,new Object[]{WKTKeywords.Fitted_CS,baseCRS.getClass()},element.offset);
  }
  final CoordinateSystemAxis[] axes=new CoordinateSystemAxis[toBase.getSourceDimensions()];
  final StringBuilder buffer=new StringBuilder(name).append("String_Node_Str");
  final int start=buffer.length();
  try {
    for (int i=0; i < axes.length; i++) {
      final String number=String.valueOf(i);
      buffer.setLength(start);
      buffer.append(number);
      axes[i]=csFactory.createCoordinateSystemAxis(singletonMap(CoordinateSystemAxis.NAME_KEY,buffer.toString()),number,AxisDirection.OTHER,Unit.ONE);
    }
    final Map<String,Object> properties=parseMetadataAndClose(element,name,baseCRS);
    final CoordinateSystem derivedCS=referencing.createAbstractCS(singletonMap(CoordinateSystem.NAME_KEY,AxisDirections.appendTo(new StringBuilder("String_Node_Str"),axes)),axes);
    properties.put("String_Node_Str",name);
    return referencing.createDerivedCRS(properties,(SingleCRS)baseCRS,method,toBase.inverse(),derivedCS);
  }
 catch (  FactoryException|NoninvertibleTransformException exception) {
    throw element.parseFailed(exception);
  }
}

Fixed version (ground truth):
/** 
 * Parses a   {@code "FITTED_CS"} element.This element has the following pattern: {@preformat wktFITTED_CS["<name>", <to base>, <base cs>]}
 * @param mode {@link #FIRST},   {@link #OPTIONAL} or {@link #MANDATORY}.
 * @param parent The parent element.
 * @return The {@code "FITTED_CS"} element as a {@link CompoundCRS} object.
 * @throws ParseException if the {@code "COMPD_CS"} element can not be parsed.
 */
private DerivedCRS parseFittedCS(final int mode,final Element parent) throws ParseException {
  final Element element=parent.pullElement(mode,WKTKeywords.Fitted_CS);
  if (element == null) {
    return null;
  }
  final String name=element.pullString("String_Node_Str");
  final MathTransform toBase=parseMathTransform(element,true);
  final OperationMethod method=getOperationMethod();
  final CoordinateReferenceSystem baseCRS=parseCoordinateReferenceSystem(element,true);
  if (!(baseCRS instanceof SingleCRS)) {
    throw new LocalizedParseException(errorLocale,Errors.Keys.UnexpectedValueInElement_2,new Object[]{WKTKeywords.Fitted_CS,baseCRS.getClass()},element.offset);
  }
  final CoordinateSystemAxis[] axes=new CoordinateSystemAxis[toBase.getSourceDimensions()];
  final StringBuilder buffer=new StringBuilder(name).append("String_Node_Str");
  final int start=buffer.length();
  try {
    for (int i=0; i < axes.length; i++) {
      final String number=String.valueOf(i);
      buffer.setLength(start);
      buffer.append(number);
      axes[i]=csFactory.createCoordinateSystemAxis(singletonMap(CoordinateSystemAxis.NAME_KEY,buffer.toString()),number,AxisDirection.OTHER,Unit.ONE);
    }
    final Map<String,Object> properties=parseMetadataAndClose(element,name,baseCRS);
    final CoordinateSystem derivedCS=referencing.createAbstractCS(singletonMap(CoordinateSystem.NAME_KEY,AxisDirections.appendTo(new StringBuilder("String_Node_Str"),axes)),axes);
    properties.put("String_Node_Str",name);
    return referencing.createDerivedCRS(properties,(SingleCRS)baseCRS,method,toBase.inverse(),derivedCS);
  }
 catch (  FactoryException|NoninvertibleTransformException exception) {
    throw element.parseFailed(exception);
  }
}