我是hibernate的新手，我的Product模型中有IllegalArgumentException。请帮助我..我从昨晚开始研究它到现在为止我找不到解决方案..如果你帮我调试这个错误会很高兴。感谢
这是堆栈跟踪
Mar 15, 2014 6:26:55 PM org.hibernate.property.BasicPropertyAccessor$BasicSetter set
ERROR: HHH000123: IllegalArgumentException in class: com.nutsaboutcandywebproject.model.Product, setter method of property: categoryId
Mar 15, 2014 6:26:55 PM org.hibernate.property.BasicPropertyAccessor$BasicSetter set
ERROR: HHH000091: Expected type: java.lang.Integer, actual value: com.nutsaboutcandywebproject.model.Category
Mar 15, 2014 6:26:55 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [MainPageServlet] in context with path [/NutsAboutCandyWebProject] threw exception
IllegalArgumentException occurred while calling setter for property [com.nutsaboutcandywebproject.model.Product.categoryId (expected type = java.lang.Integer)]; target = [com.nutsaboutcandywebproject.model.Product@1d60c02], property value = [com.nutsaboutcandywebproject.model.Category@11cf257]
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:123)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:713)
at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:362)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:4718)
at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:188)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:144)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1114)
at org.hibernate.loader.Loader.processResultSet(Loader.java:972)
at org.hibernate.loader.Loader.doQuery(Loader.java:920)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
at org.hibernate.loader.Loader.doList(Loader.java:2553)
at org.hibernate.loader.Loader.doList(Loader.java:2539)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2369)
at org.hibernate.loader.Loader.list(Loader.java:2364)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:496)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:231)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1264)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
at com.nutsaboutcandywebproject.dao.SQLProductsDataAccess.getInventory(SQLProductsDataAccess.java:31)
at com.nutsaboutcandywebproject.service.ServiceFacadeImpl.getAllProducts(ServiceFacadeImpl.java:124)
at com.nutsaboutcandywebproject.servlets.MainPageServlet.doGet(MainPageServlet.java:35)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:68)
... 39 more
我的bean在这里..产品bean的CategoryId来自Category实体，typeId来自ProductTypes实体
package com.nutsaboutcandywebproject.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table(name = "products", catalog = "db_nutsaboutcandy")
public class Product {
private Integer id;
private Integer categoryId;
private Integer typeId;
private String name;
private Integer quantityInStock;
private Integer costPerGram;
private String description;
//default constructor
public Product() {
}
public Product(Integer id, Integer categoryId, Integer typeId, String name,
Integer costPerGram, Integer quantityInStock, String description) {
super();
setId(id);
this.categoryId = categoryId;
this.typeId = typeId;
this.name = name;
this.quantityInStock = quantityInStock;
this.costPerGram = costPerGram;
this.description = description;
}
public Product(Integer categoryId, Integer typeId, String name,
Integer quantityInStock, Integer costPerGram, String description) {
super();
this.categoryId = categoryId;
this.typeId = typeId;
this.name = name;
this.quantityInStock = quantityInStock;
this.costPerGram = costPerGram;
this.description = description;
}
@Id
@GeneratedValue
@Column(name = "product_id", unique = true, nullable = false)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@ManyToOne(targetEntity = Category.class)
@JoinColumn(name = "category_id", nullable = false)
public Integer getCategoryId() {
return categoryId;
}
public void setCategoryId(Integer categoryId) {
this.categoryId = categoryId;
}
@ManyToOne(targetEntity = ProductTypes.class)
@JoinColumn(name = "type_id", nullable = false)
public Integer getTypeId() {
return typeId;
}
public void setTypeId(Integer typeId) {
this.typeId = typeId;
}
@Column(name = "product_name", nullable = false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(name = "quantity_in_stock", nullable = false)
public Integer getQuantityInStock() {
return quantityInStock;
}
public void setQuantityInStock(Integer quantityInStock) {
this.quantityInStock = quantityInStock;
}
@Column(name = "cost_per_gram", nullable = false)
public Integer getCostPerGram() {
return costPerGram;
}
public void setCostPerGram(Integer costPerGram) {
this.costPerGram = costPerGram;
}
@Column(name = "description", nullable = false)
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
Category.class
package com.nutsaboutcandywebproject.model;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "product_categories", catalog = "db_nutsaboutcandy")
public class Category {
private Integer categoryId;
private String categoryName;
private Integer shelfLifeDays;
public Category(){
}
public Category(Integer categoryId, String categoryName,
Integer shelfLifeDays) {
super();
this.categoryId = categoryId;
this.categoryName = categoryName;
this.shelfLifeDays = shelfLifeDays;
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "category_id", unique = true, nullable = false)
public Integer getCategoryId() {
return categoryId;
}
public void setCategoryId(Integer categoryId) {
this.categoryId = categoryId;
}
@Column(name = "category_name", nullable = false)
public String getCategoryName() {
return categoryName;
}
public void setCategoryName(String categoryName) {
this.categoryName = categoryName;
}
@Column(name = "shelf_life_days", nullable = false)
public Integer getShelfLifeDays() {
return shelfLifeDays;
}
public void setShelfLifeDays(Integer shelfLifeDays) {
this.shelfLifeDays = shelfLifeDays;
}
}
ProductTypes.class
package com.nutsaboutcandywebproject.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "product_types", catalog = "db_nutsaboutcandy")
public class ProductTypes {
private Integer typeId;
private String typeName;
public ProductTypes(Integer typeId, String typeName) {
super();
this.typeId = typeId;
this.typeName = typeName;
}
public ProductTypes(){
}
@Id
@GeneratedValue
@Column(name = "type_id", nullable = false)
public Integer getTypeId() {
return typeId;
}
public void setTypeId(Integer typeId) {
this.typeId = typeId;
}
@Column(name = "type_name", nullable = false)
public String getTypeName() {
return typeName;
}
public void setTypeName(String typeName) {
this.typeName = typeName;
}
}
答案 0 :(得分：1)
试试这个：
private Category category;
然后，
@ManyToOne
@JoinColumn(name = "category_id", nullable = false)
public Category getCategory() {
return category;
}
public void setCategory(Category category) {
this.category = category;
}
然后使用category.getId();