java.lang.IllegalStateException：找不到java.util.List的主构造函数 [英] java.lang.IllegalStateException: No primary constructor found for java.util.List
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问题描述
我的项目基于spring boot，Thymeleaf，mysql，html和Jquery。
向@controller发布一个 EntSetCharges类型数据列表，但它不会成功......它会像
一样发生错误
java.lang.IllegalStateException：找不到
的主构造函数java.util.List
以前我曾与此错误
@RestController
@PostMapping（value =/ updatesetcharges）
public ModelAndView doUpdateSetCharges（@ModelAttribute WrpSetCharges tempEntSetChargesList）
{
ModelAndView respondResult = new ModelAndView（）;
尝试{
列表< EntSetCharges> entSetChargesList = new ArrayList<>（）;
for（EntSetCharges ent：tempEntSetChargesList.getTempEntSetChargesList（））
{//逻辑去这里
HTML
< form id =setchargesformidmethod =postth：object =$ {tempEntSetChargesList}th：action =@ {/ updatesetcharges}>
包装类
public class WrpSetCharges {
private List< EntSetCharges> tempEntSetChargesList = new ArrayList<>（）;
公共列表< EntSetCharges> getTempEntSetChargesList（）{
return tempEntSetChargesList;
}
public void setTempEntSetChargesList（List< EntSetCharges> tempEntSetChargesList）{
this.tempEntSetChargesList = tempEntSetChargesList;
}
}
解决方案
把你的列表放在一个包装类中，并将这个类用作ModelAttributes
class ListWrapper {
List< EntSetCharges> tempEntSetChargesList;
公共列表< EntSetCharges> getTempEntSetChargesList（）{
return tempEntSetChargesList;
}
public void setTempEntSetChargesList（List< EntSetCharges> tempEntSetChargesList）{
this.tempEntSetChargesList = tempEntSetChargesList;
$ b 在这里搜索如何绑定对象列表thymeleaf。
ex。 如何绑定对象列表与百里香
以下列表中的绑定项目示例。
< tbody>
< tr th：each =currentClient，stat：* {clientList}>
< td>
< input type =checkboxth：field =* {clientList [__ $ {stat.index} __]。selected}/>
< input type =hiddenth：field =* {clientList [__ $ {stat.index} __]。clientID}/>
< input type =hiddenth：field =* {clientList [__ $ {stat.index} __] .ipAddress}/>
< input type =hiddenth：field =* {clientList [__ $ {stat.index} __]。description}/>
< / td>
< td th：text =$ {currentClient.getClientID（）}>< / td>
< td th：text =$ {currentClient.getIpAddress（）}>< / td>
< td th：text =$ {currentClient.getDescription（）}>< / td>
< / tr>
< / tbody>
My project based on spring boot,Thymeleaf,mysql,html and Jquery.
I tried to post a List of EntSetCharges type data to the @controller ,but it is not succeed..it trows error like
java.lang.IllegalStateException: No primary constructor found for
java.util.List
Previously i worked with this error org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'chargesName' cannot be found on null
Now i got another error in same page
Here is my full code...
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<!-- bootstrap css lib -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<!-- Bootstrap/Jquery CDN library files -->
<script src="https://code.jquery.com/jquery-3.2.1.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!-- External JQuery Script -->
<!-- <script type="text/javascript" src="../js/formjs/setchargesform.js"></script> -->
<!-- Body Content Goes Here -->
<div class="container">
<form method="post" th:object="${tempEntSetChargesList}" th:action="@{/updatesetcharges}">
<div class="table-responsive">
<table class="table table-hover">
<thead>
<tr>
<th>Charge Name</th>
<th>Amount</th>
<th>Charge/Unit Type</th>
</tr>
</thead>
<tbody>
<tr th:each="savedcharges:${savedchargeslist}">
<td id="colhide" hidden="true">
<label th:value="${savedcharges.pkSetCharges}" th:field="*{pkSetCharges}"></label>
</td>
<td>
<label th:text="${savedcharges.chargesName}" th:value="${savedcharges.chargesName}" th:field="*{chargesName}"></label>
</td>
<td>
<input id="amt1" class="form-control" th:field="*{tempUnitAmount}">
</td>
<td>
<select id="societyname" class="form-control" th:field="*{tempunitType}">
<option value="perFlat" selected="selected">perFlat</option>
<option value="perUnit">perUnit</option>
<option value="perSqrft">perSqrft</option>
</select>
</td>
</tr>
</tbody>
</table>
</div>
<button type="submit" class="btn btn-info">Submit</button>
<button type="reset" class="btn btn-warn">Reset</button>
</form>
</div>
<!-- Body content finishes -->
</body>
</html>
@RestController
@PostMapping(value="/updatesetcharges")
public ModelAndView doUpdateSetCharges(@ModelAttribute List<EntSetCharges> tempEntSetChargesList)
{
ModelAndView respondResult = new ModelAndView();
try {
List<EntSetCharges> entSetChargesList = new ArrayList<>();
for(EntSetCharges ent : tempEntSetChargesList)
{
if(ent.getTempunitType().equals("perFlat"))
{
ent.setPerFlat(Integer.parseInt(ent.getTempUnitAmount()));
}
else if(ent.getTempunitType().equals("perUnit"))
{
ent.setPerUnit(Double.parseDouble(ent.getTempUnitAmount()));
}
else
{
ent.setPerSqrft(Double.parseDouble(ent.getTempUnitAmount()));
}
entSetChargesList.add(ent);
}
Boolean result = serSetCharges.doUpdateSetCharges(entSetChargesList);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return respondResult;
}
Entity
@Entity
@Table(name="setcharges")
public class EntSetCharges implements Serializable
{
/**
*
*/
private static final long serialVersionUID = 3827507518731160293L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="pksetcharges")
private int pkSetCharges;
@Column(nullable=false)
private String chargesName;
@ColumnDefault("0")
private int perFlat;
@ColumnDefault("0")
private double perUnit;
@ColumnDefault("0")
private double perSqrft;
@Version
private int version;
private Boolean is_active;
private String created_by;
private Date created_ts;
private String modified_by;
private Date modified_ts;
private String approved_by;
private Date approved_ts;
@Transient
private String tempunitType;
@Transient
private String tempUnitAmount;
@Transient
private LogEntSetCharges tempLogEntSetCharges;
Code UPDATE V1
Here i made some changes it is hitting the Controller page,but there object is EMPTY [] ..Here is Proof of Image
@RestController
@PostMapping(value="/updatesetcharges")
public ModelAndView doUpdateSetCharges(@ModelAttribute WrpSetCharges tempEntSetChargesList)
{
ModelAndView respondResult = new ModelAndView();
try {
List<EntSetCharges> entSetChargesList = new ArrayList<>();
for(EntSetCharges ent : tempEntSetChargesList.getTempEntSetChargesList())
{ //logics goes here
in HTML
<form id="setchargesformid" method="post" th:object="${tempEntSetChargesList}" th:action="@{/updatesetcharges}">
Wrapper class
public class WrpSetCharges {
private List<EntSetCharges> tempEntSetChargesList = new ArrayList<>();
public List<EntSetCharges> getTempEntSetChargesList() {
return tempEntSetChargesList;
}
public void setTempEntSetChargesList(List<EntSetCharges> tempEntSetChargesList) {
this.tempEntSetChargesList = tempEntSetChargesList;
}
}
解决方案 Put your list in a wrapper class and use that class as your ModelAttributes
class ListWrapper{
List<EntSetCharges> tempEntSetChargesList;
public List<EntSetCharges> getTempEntSetChargesList() {
return tempEntSetChargesList;
}
public void setTempEntSetChargesList(List<EntSetCharges> tempEntSetChargesList) {
this.tempEntSetChargesList = tempEntSetChargesList;
}
}
and search here on how to bind list of objects in thymeleaf.
ex. how-to-bind-an-object-list-with-thymeleaf
below example of binding items in your list.
<tbody>
<tr th:each="currentClient, stat : *{clientList}">
<td>
<input type="checkbox" th:field="*{clientList[__${stat.index}__].selected}" />
<input type="hidden" th:field="*{clientList[__${stat.index}__].clientID}" />
<input type="hidden" th:field="*{clientList[__${stat.index}__].ipAddress}" />
<input type="hidden" th:field="*{clientList[__${stat.index}__].description}" />
</td>
<td th:text="${currentClient.getClientID()}"></td>
<td th:text="${currentClient.getIpAddress()}"></td>
<td th:text="${currentClient.getDescription()}"></td>
</tr>
</tbody>
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