無法從類型轉換[java.lang.String中]鍵入[@ javax.persistence.Id @ javax.persistence.GeneratedValue INT]

這是我在Eror JSP頁面無法從類型轉換[java.lang.String中]鍵入[@ javax.persistence.Id @ javax.persistence.GeneratedValue INT]

Servlet.service() for servlet jsp threw exception 
java.lang.NumberFormatException: For input string: "${c.catId}" 
    at java.lang.NumberFormatException.forInputString(Unknown Source) 
    at java.lang.Integer.parseInt(Unknown Source) 
    at java.lang.Integer.valueOf(Unknown Source) 
    at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:208) 
    at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:62) 
    at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:49) 
    at org.springframework.core.convert.support.GenericConversionService$ConverterFactoryAdapter.convert(GenericConversionService.java:436) 
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:37) 
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:203) 
    at org.springframework.core.convert.support.ConvertingPropertyEditorAdapter.setAsText(ConvertingPropertyEditorAdapter.java:59) 
    at org.springframework.web.servlet.tags.form.SelectedValueComparator.exhaustiveCompare(SelectedValueComparator.java:173) 
    at org.springframework.web.servlet.tags.form.SelectedValueComparator.isSelected(SelectedValueComparator.java:98) 
    at org.springframework.web.servlet.tags.form.OptionTag.isSelected(OptionTag.java:238) 
    at org.springframework.web.servlet.tags.form.OptionTag.renderOption(OptionTag.java:202) 
    at org.springframework.web.servlet.tags.form.OptionTag.renderFromBodyContent(OptionTag.java:151) 
    at org.springframework.web.servlet.tags.form.AbstractHtmlElementBodyTag.doEndTag(AbstractHtmlElementBodyTag.java:66) 
    at org.apache.jsp.WEB_002dINF.views.ProductForm_jsp._jspService(ProductForm_jsp.java:333) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:716) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318) 
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168) 
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) 
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1286) 
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1041) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:984) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Unknown Source) 

Aug 03, 2017 2:06:22 PM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/frontend] threw exception [org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@javax.persistence.Id @javax.persistence.GeneratedValue int] for value '${c.catId}'; nested exception is java.lang.NumberFormatException: For input string: "${c.catId}"] with root cause 
java.lang.NumberFormatException: For input string: "${c.catId}" 
    at java.lang.NumberFormatException.forInputString(Unknown Source) 
    at java.lang.Integer.parseInt(Unknown Source) 
    at java.lang.Integer.valueOf(Unknown Source) 
    at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:208) 
    at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:62) 
    at org.springframework.core.convert.support.StringToNumberConverterFactory$StringToNumber.convert(StringToNumberConverterFactory.java:49) 
    at org.springframework.core.convert.support.GenericConversionService$ConverterFactoryAdapter.convert(GenericConversionService.java:436) 
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:37) 
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:203) 
    at org.springframework.core.convert.support.ConvertingPropertyEditorAdapter.setAsText(ConvertingPropertyEditorAdapter.java:59) 
    at org.springframework.web.servlet.tags.form.SelectedValueComparator.exhaustiveCompare(SelectedValueComparator.java:173) 
    at org.springframework.web.servlet.tags.form.SelectedValueComparator.isSelected(SelectedValueComparator.java:98) 
    at org.springframework.web.servlet.tags.form.OptionTag.isSelected(OptionTag.java:238) 
    at org.springframework.web.servlet.tags.form.OptionTag.renderOption(OptionTag.java:202) 
    at org.springframework.web.servlet.tags.form.OptionTag.renderFromBodyContent(OptionTag.java:151) 
    at org.springframework.web.servlet.tags.form.AbstractHtmlElementBodyTag.doEndTag(AbstractHtmlElementBodyTag.java:66) 
    at org.apache.jsp.WEB_002dINF.views.ProductForm_jsp._jspService(ProductForm_jsp.java:333) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:716) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318) 
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168) 
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) 
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1286) 
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1041) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:984) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Unknown Source)

這是我的產品形式在那裏我'點擊賣出fasgen

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1"%> 
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="a" %> 
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %> 
<!DOCTYPE html> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 
<title>Product Form</title> 
</head> 
<body> 
<jsp:include page="Header.jsp"></jsp:include> 
<!-- Product insertion --> 
<%-- <a:url var="url" value='/saveproduct' /> --%> 
<%-- <spring:url value='/saveproduct' var="url"/> --%> 
<form:form action="saveproduct" commandName="product"> 
<div class="form-group"> 
<form:hidden path="pid" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Model Details: 
<form:input path="modelDetails" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Product Name: 
<form:input path="productname" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Price: 
<form:input path="price" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Quantity: 
<form:input path="qty" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Patter: 
<form:input path="pattern" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Style Type: 
<form:input path="styleType" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Wear Type 
<form:input path="weartype" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Style Code: 
<form:input path="styleCode" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Colour: 
<form:input path="color" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Fabric Care: 
<form:input path="fabriccare" class="form-control" /> 
</div> 
<div class="form-group"> 
Type: 
<form:input path="type" class="form-control" /> 
</div> 
<div class="form-group"> 
Sleeve: 
<form:input path="sleeve" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Neck Type: 
<form:input path="necktype" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Pockets: 
<form:input path="pockets" class="form-control" /> 
</div> 
<div class="form-group"> 
Enter Pockets: 
<form:input path="price" class="form-control" /> 
</div> 
<div class="form-group"> 
Ideal For: 
<form:select path="category.catId"> 
<a:forEach items="${categories} " var="c" > 
<form:option value="${c.catId}">${c.idealfor }</form:option> 
</a:forEach> 
</form:select> 
</div> 
<div class="form-group"> 
<input type="submit" value="Add Product"> 
</div> 
</form:form> 

<jsp:include page="Footer.jsp"></jsp:include> 
</body> 
</html>

我控制器產品

package com.project.controllers; 

import java.util.List; 

//import javax.servlet.http.HttpServletRequest; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Controller; 
import org.springframework.ui.Model; 
import org.springframework.validation.BindingResult; 
import org.springframework.web.bind.annotation.ModelAttribute; 
import org.springframework.web.bind.annotation.RequestMapping; 

import com.project.service.ProductService; 
import com.project.model.Category; 
//import com.project.service.ProductServiceImpl; 
import com.project.model.Product; 

@Controller 
public class ProductController { 
    @Autowired 
    private ProductService productService; 
    @RequestMapping(value="/ProductForm") 
    public String productForm(Model model) { 
     List<Category> categories=productService.getAllCategory(); 
     model.addAttribute("categories",categories); 
     model.addAttribute("product", new Product()); 
     System.out.println(categories); 
     return "ProductForm"; 
    } 
    @RequestMapping(value="/saveproduct") 
    public String saveProduct(@ModelAttribute(name="product") Product product,BindingResult result){ 
     productService.addProduct(product); 
     return "Home"; 
    } 

}

，這我的模型

package com.project.model; 


import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.JoinColumn; 
import javax.persistence.ManyToOne; 

@Entity 
public class Product { 
    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    private int pid; 
    private int qty; 
    private String productname; 
    private String modelDetails; 
    private String pattern; 
    private String styleType; 
    private String weartype; 
    private String styleCode; 
    private String color; 
    private String fabriccare; 
    private String type; 
    private String sleeve; 
    private String necktype; 
    private int pockets; 
    private double price; 
    @ManyToOne 
    @JoinColumn(name="catId") 
    private Category category; 
    public int getPid() { 
     return pid; 
    } 
    public int getQty() { 
     return qty; 
    } 
    public String getProductname() { 
     return productname; 
    } 
    public String getModelDetails() { 
     return modelDetails; 
    } 
    public String getPattern() { 
     return pattern; 
    } 
    public String getStyleType() { 
     return styleType; 
    } 
    public String getWeartype() { 
     return weartype; 
    } 
    public String getStyleCode() { 
     return styleCode; 
    } 
    public String getColor() { 
     return color; 
    } 
    public String getFabriccare() { 
     return fabriccare; 
    } 
    public String getType() { 
     return type; 
    } 
    public String getSleeve() { 
     return sleeve; 
    } 
    public String getNecktype() { 
     return necktype; 
    } 
    public int getPockets() { 
     return pockets; 
    } 
    public double getPrice() { 
     return price; 
    } 
    public Category getCategory() { 
     return category; 
    } 
    public void setPid(int pid) { 
     this.pid = pid; 
    } 
    public void setQty(int qty) { 
     this.qty = qty; 
    } 
    public void setProductname(String productname) { 
     this.productname = productname; 
    } 
    public void setModelDetails(String modelDetails) { 
     this.modelDetails = modelDetails; 
    } 
    public void setPattern(String pattern) { 
     this.pattern = pattern; 
    } 
    public void setStyleType(String styleType) { 
     this.styleType = styleType; 
    } 
    public void setWeartype(String weartype) { 
     this.weartype = weartype; 
    } 
    public void setStyleCode(String styleCode) { 
     this.styleCode = styleCode; 
    } 
    public void setColor(String color) { 
     this.color = color; 
    } 
    public void setFabriccare(String fabriccare) { 
     this.fabriccare = fabriccare; 
    } 
    public void setType(String type) { 
     this.type = type; 
    } 
    public void setSleeve(String sleeve) { 
     this.sleeve = sleeve; 
    } 
    public void setNecktype(String necktype) { 
     this.necktype = necktype; 
    } 
    public void setPockets(int pockets) { 
     this.pockets = pockets; 
    } 
    public void setPrice(double price) { 
     this.price = price; 
    } 
    public void setCategory(Category category) { 
     this.category = category; 
    } 


}

分類模型

package com.project.model; 

import javax.persistence.CascadeType; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.OneToMany; 
import java.util.List; 

@Entity 
public class Category { 
    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    private int catId; 
    private String idealfor; 
    @OneToMany(cascade=CascadeType.ALL,mappedBy="category") 
    private List<Product> product; 
    public int getCatId() { 
     return catId; 
    } 
    public String getIdealfor() { 
     return idealfor; 
    } 
    public List<Product> getProduct() { 
     return product; 
    } 
    public void setCatId(int catId) { 
     this.catId = catId; 
    } 
    public void setIdealfor(String idealfor) { 
     this.idealfor = idealfor; 
    } 
    public void setProduct(List<Product> product) { 
     this.product = product; 
    } 

}

現在我就在headear.jsp上Fashgen賣出時點擊一下，它顯示這個exception.I有諸多檢查解決方案，但在最後，我需要幫助形成你，請讓我離開這個問題

我加入類實體的太

來源

2017-08-03 Karangupta

你確定類別ID是正確的，正確的進賬？您的類別ID不正確。它的格式不正確，不是數字。你還可以發佈你的'Category'實體嗎？ –

在我看來，（預期的）表達式「$ {c.id}」在jsp的上下文中不是「正確」評估的，而是按字面上的「$ {c.id}」傳遞給控制器的。我只能建議你弄清楚爲什麼會發生這種情況。 – gtosto

我已將類別添加到問題 – Karangupta

經本人測試你的代碼我才明白，你的類別有沒有爲適當的setter這是造成問題

public void setCatId(int catid) { 
    this.catId = catId; //This statement doesn't ever set the catId to catid 
}

所以在你Category類更改setCatId方法本

public void setCatId(int catid) { 
    this.catId = catid; //Set catId to catid 
}

注：總是試圖用IDE來自動生成制定者/吸氣。在Eclipse Source -> Generate Getters and Setters...

更新1： 你消氣似乎也沒有在正確的格式。更新您的getter這個

public int getCatId() { //Mind the camelCase name of this method 
    return catId; 
}

來源

2017-08-03 08:28:19

我通過使用spring IDE自動生成setters/getters來完成此操作。 – Karangupta

Bu不正確。 'this.catId = catid;'是正確的。 –

順便說一下，我的eclipse是自動生成正確的setter/getters。用正確的名字。 –

無法從類型轉換[java.lang.String中]鍵入[@ javax.persistence.Id @ javax.persistence.GeneratedValue INT]

回答

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