Program: 77774
Project: 77774
Buggy source:
public void startPage(IPageContent page){
  pageNo++;
  if (pageNo > 1 && outputMasterPageContent == false) {
    writer.openTag("String_Node_Str");
    writer.closeTag("String_Node_Str");
  }
  writer.openTag(HTMLTags.TAG_DIV);
  if (page != null) {
    Object genBy=page.getGenerateBy();
    if (genBy instanceof MasterPageDesign) {
      MasterPageDesign masterPage=(MasterPageDesign)genBy;
      String masterPageStyleName=masterPage.getStyleName();
      IStyle classStyle=report.findStyle(masterPageStyleName);
      StringBuffer styleBuffer=new StringBuffer();
      AttributeBuilder.buildBackgroundStyle(styleBuffer,classStyle,this);
      writer.attribute(HTMLTags.ATTR_STYLE,styleBuffer.toString());
    }
  }
  if (htmlRtLFlag) {
    writer.attribute(HTMLTags.ATTR_HTML_DIR,"String_Node_Str");
  }
  if (pageNo > 1) {
    writer.attribute(HTMLTags.ATTR_STYLE,"String_Node_Str");
  }
  if (page != null) {
    if (outputMasterPageContent) {
      writer.openTag(HTMLTags.TAG_DIV);
      handlePageStyle(page.getPageHeader().getStyleClass(),page.getPageHeader().getStyle());
      contentVisitor.visitChildren(page.getPageHeader(),null);
      writer.closeTag(HTMLTags.TAG_DIV);
    }
  }
  writer.openTag(HTMLTags.TAG_DIV);
  if (page != null) {
    IContent pageBody=page.getPageBody();
    IStyle bodyStyle=pageBody.getStyle();
    String bodyStyleName=pageBody.getStyleClass();
    Object genBy=page.getGenerateBy();
    if (genBy instanceof MasterPageDesign) {
      MasterPageDesign masterPage=(MasterPageDesign)genBy;
      StringBuffer styleBuffer=new StringBuffer();
      if (isEmbeddable) {
        AttributeBuilder.buildPageStyle(styleBuffer,bodyStyle,this);
      }
 else {
        IStyle classStyle=report.findStyle(bodyStyleName);
        AttributeBuilder.buildPageStyle(styleBuffer,classStyle,this);
      }
      if (!pageFooterFloatFlag) {
        AttributeBuilder.buildSize(styleBuffer,HTMLTags.ATTR_MIN_HEIGHT,masterPage.getPageHeight());
      }
      writer.attribute(HTMLTags.ATTR_STYLE,styleBuffer.toString());
    }
  }
}

Fixed version (ground truth):
public void startPage(IPageContent page){
  pageNo++;
  if (pageNo > 1 && outputMasterPageContent == false) {
    writer.openTag("String_Node_Str");
    writer.closeTag("String_Node_Str");
  }
  writer.openTag(HTMLTags.TAG_DIV);
  if (page != null) {
    Object genBy=page.getGenerateBy();
    if (genBy instanceof MasterPageDesign) {
      MasterPageDesign masterPage=(MasterPageDesign)genBy;
      String masterPageStyleName=masterPage.getStyleName();
      IStyle classStyle=report.findStyle(masterPageStyleName);
      StringBuffer styleBuffer=new StringBuffer();
      AttributeBuilder.buildBackgroundStyle(styleBuffer,classStyle,this);
      writer.attribute(HTMLTags.ATTR_STYLE,styleBuffer.toString());
    }
  }
  if (htmlRtLFlag) {
    writer.attribute(HTMLTags.ATTR_HTML_DIR,"String_Node_Str");
  }
  if (pageNo > 1) {
    writer.attribute(HTMLTags.ATTR_STYLE,"String_Node_Str");
  }
  if (page != null) {
    if (outputMasterPageContent) {
      boolean showHeader=true;
      Object genBy=page.getGenerateBy();
      if (genBy instanceof SimpleMasterPageDesign) {
        SimpleMasterPageDesign masterPage=(SimpleMasterPageDesign)genBy;
        if (!masterPage.isShowHeaderOnFirst()) {
          if (page.getPageNumber() == 1) {
            showHeader=false;
          }
        }
      }
      if (showHeader) {
        writer.openTag(HTMLTags.TAG_DIV);
        handlePageStyle(page.getPageHeader().getStyleClass(),page.getPageHeader().getStyle());
        contentVisitor.visitChildren(page.getPageHeader(),null);
        writer.closeTag(HTMLTags.TAG_DIV);
      }
    }
  }
  writer.openTag(HTMLTags.TAG_DIV);
  if (page != null) {
    IContent pageBody=page.getPageBody();
    IStyle bodyStyle=pageBody.getStyle();
    String bodyStyleName=pageBody.getStyleClass();
    Object genBy=page.getGenerateBy();
    if (genBy instanceof MasterPageDesign) {
      MasterPageDesign masterPage=(MasterPageDesign)genBy;
      StringBuffer styleBuffer=new StringBuffer();
      if (isEmbeddable) {
        AttributeBuilder.buildPageStyle(styleBuffer,bodyStyle,this);
      }
 else {
        IStyle classStyle=report.findStyle(bodyStyleName);
        AttributeBuilder.buildPageStyle(styleBuffer,classStyle,this);
      }
      if (!pageFooterFloatFlag) {
        AttributeBuilder.buildSize(styleBuffer,HTMLTags.ATTR_MIN_HEIGHT,masterPage.getPageHeight());
      }
      writer.attribute(HTMLTags.ATTR_STYLE,styleBuffer.toString());
    }
  }
}