Program: 163287
Project: 163287
Buggy source:
@Override protected void processRow(Object[] row){
  if (row.length > 0 && lookaheadFormats != null || lookbehindFormats != null) {
    String value=String.valueOf(row[0]);
    int end;
    if (value.length() >= lookupChars.length) {
      end=lookupChars.length;
    }
 else {
      end=value.length();
      for (int i=lookupChars.length - 1; i > end; i--) {
        lookupChars[i]='\0';
      }
    }
    value.getChars(0,end,lookupChars,0);
    boolean matched=false;
    if (lookaheadFormats != null) {
      for (int i=0; i < lookaheadFormats.length; i++) {
        if (lookaheadFormats[i].matches(lookupChars)) {
          fieldLengths=lookaheadFormats[i].lengths;
          fieldAlignments=lookaheadFormats[i].alignments;
          fieldPaddings=lookaheadFormats[i].paddings;
          matched=true;
          break;
        }
      }
      if (lookbehindFormats != null && matched) {
        lookbehindFormat=null;
        for (int i=0; i < lookbehindFormats.length; i++) {
          if (lookbehindFormats[i].matches(lookupChars)) {
            lookbehindFormat=lookbehindFormats[i];
            break;
          }
        }
      }
    }
 else {
      for (int i=0; i < lookbehindFormats.length; i++) {
        if (lookbehindFormats[i].matches(lookupChars)) {
          lookbehindFormat=lookbehindFormats[i];
          matched=true;
          fieldLengths=rootLengths;
          fieldAlignments=rootAlignments;
          fieldPaddings=rootPaddings;
          break;
        }
      }
    }
    if (!matched) {
      if (lookbehindFormat == null) {
        if (rootLengths == null) {
          throw new TextWritingException("String_Node_Str" + new String(lookupChars) + '\'',getRecordCount(),row);
        }
        fieldLengths=rootLengths;
        fieldAlignments=rootAlignments;
        fieldPaddings=rootPaddings;
      }
 else {
        fieldLengths=lookbehindFormat.lengths;
        fieldAlignments=lookbehindFormat.alignments;
        fieldPaddings=lookbehindFormat.paddings;
      }
    }
  }
  int lastIndex=fieldLengths.length < row.length ? fieldLengths.length : row.length;
  for (int i=0; i < lastIndex; i++) {
    length=fieldLengths[i];
    alignment=fieldAlignments[i];
    padding=fieldPaddings[i];
    if (writingHeaders) {
      if (defaultHeaderPadding) {
        padding=defaultPadding;
      }
      if (defaultHeaderAlignment != null) {
        alignment=defaultHeaderAlignment;
      }
    }
    String nextElement=getStringValue(row[i]);
    processElement(nextElement);
    appendValueToRow();
  }
}

Fixed version (ground truth):
@Override protected void processRow(Object[] row){
  if (row.length > 0 && lookaheadFormats != null || lookbehindFormats != null) {
    int dstBegin=0;
    for (int i=0; i < row.length && dstBegin < lookupChars.length; i++) {
      String value=String.valueOf(row[i]);
      int len=value.length();
      if (dstBegin + len > lookupChars.length) {
        len=lookupChars.length - dstBegin;
      }
      value.getChars(0,len,lookupChars,dstBegin);
      dstBegin+=len;
    }
    for (int i=lookupChars.length - 1; i > dstBegin; i--) {
      lookupChars[i]='\0';
    }
    boolean matched=false;
    if (lookaheadFormats != null) {
      for (int i=0; i < lookaheadFormats.length; i++) {
        if (lookaheadFormats[i].matches(lookupChars)) {
          fieldLengths=lookaheadFormats[i].lengths;
          fieldAlignments=lookaheadFormats[i].alignments;
          fieldPaddings=lookaheadFormats[i].paddings;
          matched=true;
          break;
        }
      }
      if (lookbehindFormats != null && matched) {
        lookbehindFormat=null;
        for (int i=0; i < lookbehindFormats.length; i++) {
          if (lookbehindFormats[i].matches(lookupChars)) {
            lookbehindFormat=lookbehindFormats[i];
            break;
          }
        }
      }
    }
 else {
      for (int i=0; i < lookbehindFormats.length; i++) {
        if (lookbehindFormats[i].matches(lookupChars)) {
          lookbehindFormat=lookbehindFormats[i];
          matched=true;
          fieldLengths=rootLengths;
          fieldAlignments=rootAlignments;
          fieldPaddings=rootPaddings;
          break;
        }
      }
    }
    if (!matched) {
      if (lookbehindFormat == null) {
        if (rootLengths == null) {
          throw new TextWritingException("String_Node_Str" + new String(lookupChars) + '\'',getRecordCount(),row);
        }
        fieldLengths=rootLengths;
        fieldAlignments=rootAlignments;
        fieldPaddings=rootPaddings;
      }
 else {
        fieldLengths=lookbehindFormat.lengths;
        fieldAlignments=lookbehindFormat.alignments;
        fieldPaddings=lookbehindFormat.paddings;
      }
    }
  }
  int lastIndex=fieldLengths.length < row.length ? fieldLengths.length : row.length;
  for (int i=0; i < lastIndex; i++) {
    length=fieldLengths[i];
    alignment=fieldAlignments[i];
    padding=fieldPaddings[i];
    if (writingHeaders) {
      if (defaultHeaderPadding) {
        padding=defaultPadding;
      }
      if (defaultHeaderAlignment != null) {
        alignment=defaultHeaderAlignment;
      }
    }
    String nextElement=getStringValue(row[i]);
    processElement(nextElement);
    appendValueToRow();
  }
}