SSH开发web应用遇到的问题?报错

Struts has detected an unhandled exception:

177: 178: 179: 180: 181: Stacktrace:

下面是相关代码

LoanInfo_query_result.jsp报错中提到的部分

<tr>
            <td height="20" bgcolor="#FFFFFF"><div align="center" class="STYLE1">
              <div align="center"><%=currentIndex %></div>
            </div></td>
            <td height="20" bgcolor="#FFFFFF"><div align="center"><span class="STYLE1"><%=loanInfo.getLoanId() %></span></div></td>
            <td bgcolor="#FFFFFF"><div align="center"><span class="STYLE1"><%=loanInfo.getBook().getBookName() %></span></div></td>
            <td bgcolor="#FFFFFF"><div align="center"><span class="STYLE1"><%=loanInfo.getReader().getReaderName() %></span></div></td>
            <td height="20" bgcolor="#FFFFFF"><div align="center"><span class="STYLE1"><%=loanInfo.getBorrowTIme() %></span></div></td>
            <td height="20" bgcolor="#FFFFFF"><div align="center"><span class="STYLE1"><%=loanInfo.getReturnTIme() %></span></div></td>
            <td height="20" bgcolor="#FFFFFF"><div align="center">
            <span class="STYLE4">
            <span style="cursor:hand;" onclick="location. %>LoanInfo/LoanInfo_ModifyLoanInfoQuery.action?loanId=<%=loanInfo.getLoanId() %>'"><a src="<%=basePath %>images/edt.gif" width="16" height="16"/>编辑   </a></span>
            <img src="<%=basePath %>images/del.gif" width="16" height="16"/><a  %>LoanInfo/LoanInfo_DeleteLoanInfo.action?loanId=<%=loanInfo.getLoanId() %>" onclick="return confirm('确定删除本LoanInfo吗?');">删除</a></span>
            </div></td>
          </tr>

package com.domain;

public class LoanInfo {
    /*借阅编号*/
    private int loanId;
    public int getLoanId() {
        return loanId;
    }
    public void setLoanId(int loanId) {
        this.loanId = loanId;
    }

    /*图书对象*/
    private Book book;
    public Book getBook() {
        return book;
    }
    public void setBook(Book book) {
        this.book = book;
    }

    /*读者对象*/
    private Reader reader;
    public Reader getReader() {
        return reader;
    }
    public void setReader(Reader reader) {
        this.reader = reader;
    }

    /*借阅时间*/
    private String borrowTIme;
    public String getBorrowTIme() {
        return borrowTIme;
    }
    public void setBorrowTIme(String borrowTIme) {
        this.borrowTIme = borrowTIme;
    }

    /*归还时间*/
    private String returnTIme;
    public String getReturnTIme() {
        return returnTIme;
    }
    public void setReturnTIme(String returnTIme) {
        this.returnTIme = returnTIme;
    }

}

package com.domain;

public class Book {
    /*图书名称*/
    private String bookName;
    public String getBookName() {
        return bookName;
    }
    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    /*图书所在类别*/
    private BookType bookType;
    public BookType getBookType() {
        return bookType;
    }
    public void setBookType(BookType bookType) {
        this.bookType = bookType;
    }

    /*图书价格*/
    private float price;
    public float getPrice() {
        return price;
    }
    public void setPrice(float price) {
        this.price = price;
    }

    /*库存*/
    private int count;
    public int getCount() {
        return count;
    }
    public void setCount(int count) {
        this.count = count;
    }

    /*出版社*/
    private String publish;
    public String getPublish() {
        return publish;
    }
    public void setPublish(String publish) {
        this.publish = publish;
    }

    /*图书条形码*/
    private String barcode;
    public String getBarcode() {
        return barcode;
    }
    public void setBarcode(String barcode) {
        this.barcode = barcode;
    }

}