简单地说，首先 - 我收到此异常消息：
serverError: class javax.faces.el.EvaluationException Duplicate annotation for class: interface javax.validation.constraints.Size: @javax.validation.constraints.Size(groups=[], min=0, message={javax.validation.constraints.Size.message}, payload=[], max=128)
我的代码包含1个表的实体类，一个EJB，一个＆＃39;业务类＆＃39;和一个JSF页面;当我调用EntityManager.merge（）时发生异常。只有1个注释带有＆＃39; max = 128＆＃39;在其中：
@Size(max = 128)
@Column(name = "name")
private String name;
唯一带有重复注释的地方是：
@Entity
@Table(name = "attributes", schema = "office_db")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Attributes.findAll", query = "SELECT a FROM Attributes a"),
@NamedQuery(name = "Attributes.findById", query = "SELECT a FROM Attributes a WHERE a.id = :id"),
@NamedQuery(name = "Attributes.findByName", query = "SELECT a FROM Attributes a WHERE a.name = :name"),
@NamedQuery(name = "Attributes.findByType", query = "SELECT a FROM Attributes a where a.type.id = :type")
})
但我认为这应该是合法的，因为它是由Netbeans 8.2从数据库表中生成的。
现在有更多细节。首先是表格：
mysql> show create table attributes\G
*************************** 1. row ***************************
Table: attributes
Create Table: CREATE TABLE `attributes` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`parent` int(11) DEFAULT NULL,
`type` int(11) DEFAULT NULL,
`name` varchar(128) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `parent_ix` (`parent`),
KEY `type_ix` (`type`),
CONSTRAINT `attributes_parent_fk` FOREIGN KEY (`parent`) REFERENCES `attributes` (`id`),
CONSTRAINT `attributes_type_fk` FOREIGN KEY (`type`) REFERENCES `attributes` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1301 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
1 row in set (0.03 sec)
接下来是Entity类：
import (...stuff...)
@Entity
@Table(name = "attributes")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Attributes.findAll", query = "SELECT a FROM Attributes a"),
@NamedQuery(name = "Attributes.findById", query = "SELECT a FROM Attributes a WHERE a.id = :id"),
@NamedQuery(name = "Attributes.findByName", query = "SELECT a FROM Attributes a WHERE a.name = :name"),
@NamedQuery(name = "Attributes.findByType", query = "SELECT a FROM Attributes a where a.type.id = :type")
})
public class Attributes implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Size(max = 128)
@Column(name = "name")
private String name;
@OneToMany(mappedBy = "parent")
private Collection<Attributes> attributesCollection;
@JoinColumn(name = "parent", referencedColumnName = "id")
@ManyToOne
private Attributes parent;
@OneToMany(mappedBy = "type")
private Collection<Attributes> attributesCollection1;
@JoinColumn(name = "type", referencedColumnName = "id")
@ManyToOne
private Attributes type;
private static final Logger logger=
Logger.getLogger(Attributes.class.getName());
public Attributes() {
}
public Attributes(Integer id) {
this.id = id;
}
public Attributes(Integer id, Integer parent, Integer type, String name) {
logger.info("OFFICE Attributes constructor 3 id: "+id+", parent: "+parent+", type: "+type+", name: "+name);
this.parent=new Attributes();
this.type=new Attributes();
this.id = id;
this.parent.setId(parent);
this.type.setId(type);
this.name = name;
}
public Attributes(Integer parent, Integer type, String name) {
logger.info("OFFICE Attributes constructor 4 parent: "+parent+", type: "+type+", name: "+name);
this.parent=new Attributes();
this.type=new Attributes();
this.parent.setId(parent);
this.type.setId(type);
this.name = name;
logger.info("OFFICE Attributes constructor 4a");
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@XmlTransient
public Collection<Attributes> getAttributesCollection() {
return attributesCollection;
}
public void setAttributesCollection(Collection<Attributes> attributesCollection) {
this.attributesCollection = attributesCollection;
}
public Attributes getParent() {
return parent;
}
public void setParent(Attributes parent) {
this.parent = parent;
}
@XmlTransient
public Collection<Attributes> getAttributesCollection1() {
return attributesCollection1;
}
public void setAttributesCollection1(Collection<Attributes> attributesCollection1) {
this.attributesCollection1 = attributesCollection1;
}
public Attributes getType() {
return type;
}
public void setType(Attributes type) {
this.type = type;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Attributes)) {
return false;
}
Attributes other = (Attributes) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "docdb.Attributes[ id=" + id + " ]";
}
}
EJB或会话类：
import (...stuff...)
@Stateless
public class AttributesSession {
@PersistenceContext(unitName ="officePU")
private EntityManager em;
private static final Logger logger=
Logger.getLogger(AttributesSession.class.getName());
public List<Attributes>findAttributes(){
TypedQuery<Attributes> query=
em.createNamedQuery("Attributes.findAll",Attributes.class);
return query.getResultList();
}
public Attributes findAttributeById(Long id){
TypedQuery<Attributes> query=
em.createNamedQuery("Attributes.findById", Attributes.class);
query.setParameter("id", id);
return query.getSingleResult();
}
public Integer findChildCount(Long id){
TypedQuery<Integer> query=em.createNamedQuery("findChildCount",Integer.class);
query.setParameter("id", id);
return query.getSingleResult();
}
public String createAttributes(Attributes attr){
String msg="";
try{
em.merge(attr);
em.flush();
}
catch (PersistenceException e){
msg=e.getMessage();
}
return msg;
}
public String deleteAttributes(Attributes attr){
String msg = "";
try{
em.remove(em.merge(attr));
em.flush();
}
catch (PersistenceException e){
msg=e.getMessage();
}
return msg;
}
}
业务或控制器类：
import (...stuff...)
@Named(value = "attributesController")
@SessionScoped
public class AttributesController implements Serializable{
@EJB private AttributesSession sess;
private Attributes attr;
private List<Attributes> attrList;
private Integer id;
private Integer parent;
private Integer type;
private String name;
private String errmsg;
private static final Logger logger=
Logger.getLogger(AttributesController.class.getName());
public AttributesController() {
this.attrList = new ArrayList<>();
this.attr = new Attributes();
}
public List<Attributes> getAttrList() {
return attrList;
}
public List<Attributes> getAttrValueList() {
return attrList;
}
...getters and setters...
public void clearForm(){
this.id=null;
this.name=null;
this.parent=null;
this.type=null;
this.errmsg=null;
}
public String createAttributes(){
if (this.id!=null){
attr=new Attributes(this.id,this.parent,this.type,this.name);
}
else{
attr=new Attributes(this.parent,this.type,this.name);
}
errmsg=sess.createAttributes(attr);
attrList=sess.findAttributes();
return "editattributes.xhtml";
}
public String deleteAttributes(){
if (this.id!=null){
attr=new Attributes(this.id,this.parent,this.type,this.name);
errmsg=sess.deleteAttributes(attr);
}
attrList=sess.findAttributes();
return "editattributes.xhtml";
}
public String listAttributes(){
attrList=sess.findAttributes();
return "editattributes.xhtml";
}
@PostConstruct
public void updateList(){
attrList=sess.findAttributes();
}
@Override
public String toString(){
return "Name: "+((name==null)?"":name)
+", parent: "+((parent==null)?"":parent)
+", type:"+((type==null)?"":type);
}
}
最后，堆栈跟踪：
[2017-10-31T10:23:31.697+0000] [glassfish 5.0] [WARNING] [] [javax.enterprise.resource.webcontainer.jsf.lifecycle] [tid: _ThreadID=27 _ThreadName=http-listener-1(1)] [timeMillis: 1509445411697] [levelValue: 900] [[
#{attributesController.createAttributes()}: java.lang.annotation.AnnotationFormatError: Duplicate annotation for class: interface javax.validation.constraints.Size: @javax.validation.constraints.Size(groups=[], min=0, message={javax.validation.constraints.Size.message}, payload=[], max=128)
javax.faces.FacesException: #{attributesController.createAttributes()}: java.lang.annotation.AnnotationFormatError: Duplicate annotation for class: interface javax.validation.constraints.Size: @javax.validation.constraints.Size(groups=[], min=0, message={javax.validation.constraints.Size.message}, payload=[], max=128)
...(deleted stuff)
... 35 more
Caused by: java.lang.annotation.AnnotationFormatError: Duplicate annotation for class: interface javax.validation.constraints.Size: @javax.validation.constraints.Size(groups=[], min=0, message={javax.validation.constraints.Size.message}, payload=[], max=128)
... (stuff deleted)
at docdb.__EJB31_Generated__AttributesSession__Intf____Bean__.createAttributes(Unknown Source)
at docdb.AttributesController.createAttributes(AttributesController.java:118)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at javax.el.ELUtil.invokeMethod(ELUtil.java:304)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:535)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.invoke(AstValue.java:285)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.module.web.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.module.web.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:107)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 36 more
]]
[2017-10-31T10:23:31.700+0000] [glassfish 5.0] [INFO] [] [docdb.LifeCycleListener] [tid: _ThreadID=27 _ThreadName=http-listener-1(1)] [timeMillis: 1509445411700] [levelValue: 800] [[
OFFICE END PHASE INVOKE_APPLICATION 5]]
[2017-10-31T10:23:31.701+0000] [glassfish 5.0] [INFO] [] [docdb.LifeCycleListener] [tid: _ThreadID=27 _ThreadName=http-listener-1(1)] [timeMillis: 1509445411701] [levelValue: 800] [[
OFFICE]]
[2017-10-31T10:23:31.703+0000] [glassfish 5.0] [SEVERE] [] [javax.enterprise.resource.webcontainer.jsf.context] [tid: _ThreadID=27 _ThreadName=http-listener-1(1)] [timeMillis: 1509445411703] [levelValue: 1000] [[
javax.faces.el.EvaluationException: java.lang.annotation.AnnotationFormatError: Duplicate annotation for class: interface javax.validation.constraints.Size: @javax.validation.constraints.Size(groups=[], min=0, message={javax.validation.constraints.Size.message}, payload=[], max=128)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:330)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:870)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1418)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:201)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:670)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1580)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:258)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:652)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:591)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:463)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:168)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:242)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.annotation.AnnotationFormatError: Duplicate annotation for class: interface javax.validation.constraints.Size: @javax.validation.constraints.Size(groups=[], min=0, message={javax.validation.constraints.Size.message}, payload=[], max=128)
at sun.reflect.annotation.TypeAnnotationParser.mapTypeAnnotations(TypeAnnotationParser.java:361)
at sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl.<init>(AnnotatedTypeFactory.java:139)
at sun.reflect.annotation.AnnotatedTypeFactory.buildAnnotatedType(AnnotatedTypeFactory.java:65)
at sun.reflect.annotation.TypeAnnotationParser.buildAnnotatedType(TypeAnnotationParser.java:79)
at java.lang.reflect.Field.getAnnotatedType(Field.java:1159)
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findCascadingMetaData(AnnotationMetaDataProvider.java:610)
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findPropertyMetaData(AnnotationMetaDataProvider.java:231)
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getFieldMetaData(AnnotationMetaDataProvider.java:220)
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.retrieveBeanConfiguration(AnnotationMetaDataProvider.java:128)
at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getBeanConfiguration(AnnotationMetaDataProvider.java:119)
at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getBeanConfigurationForHierarchy(BeanMetaDataManager.java:220)
at org.hibernate.validator.internal.metadata.BeanMetaDataManager.createBeanMetaData(BeanMetaDataManager.java:187)
at org.hibernate.validator.internal.metadata.BeanMetaDataManager.lambda$getBeanMetaData$0(BeanMetaDataManager.java:160)
at org.hibernate.validator.internal.metadata.BeanMetaDataManager$$Lambda$24/1020030882.apply(Unknown Source)
at java.util.concurrent.ConcurrentMap.computeIfAbsent(ConcurrentMap.java:324)
at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getBeanMetaData(BeanMetaDataManager.java:159)
at org.hibernate.validator.internal.engine.ValidatorImpl.getConstraintsForClass(ValidatorImpl.java:308)
at org.eclipse.persistence.internal.jpa.metadata.listeners.BeanValidationListener.isBeanConstrained(BeanValidationListener.java:158)
at org.eclipse.persistence.internal.jpa.metadata.listeners.BeanValidationListener.validateOnCallbackEvent(BeanValidationListener.java:108)
at org.eclipse.persistence.internal.jpa.metadata.listeners.BeanValidationListener.preUpdate(BeanValidationListener.java:94)
at org.eclipse.persistence.descriptors.DescriptorEventManager.notifyListener(DescriptorEventManager.java:726)
at org.eclipse.persistence.descriptors.DescriptorEventManager.notifyEJB30Listeners(DescriptorEventManager.java:696)
at org.eclipse.persistence.descriptors.DescriptorEventManager.executeEvent(DescriptorEventManager.java:233)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.calculateChanges(DeferredChangeDetectionPolicy.java:87)
at org.eclipse.persistence.descriptors.changetracking.AttributeChangeTrackingPolicy.calculateChangesForExistingObject(AttributeChangeTrackingPolicy.java:48)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.calculateChanges(UnitOfWorkImpl.java:711)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1566)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.issueSQLbeforeCompletion(UnitOfWorkImpl.java:3256)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.issueSQLbeforeCompletion(RepeatableWriteUnitOfWork.java:355)
at org.eclipse.persistence.transaction.AbstractSynchronizationListener.beforeCompletion(AbstractSynchronizationListener.java:158)
at org.eclipse.persistence.transaction.JTASynchronizationListener.beforeCompletion(JTASynchronizationListener.java:68)
at com.sun.enterprise.transaction.JavaEETransactionImpl.commit(JavaEETransactionImpl.java:452)
at com.sun.enterprise.transaction.JavaEETransactionManagerSimplified.commit(JavaEETransactionManagerSimplified.java:854)
at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:723)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:507)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4600)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2108)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2078)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:220)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
at com.sun.proxy.$Proxy175.createAttributes(Unknown Source)
at docdb.__EJB31_Generated__AttributesSession__Intf____Bean__.createAttributes(Unknown Source)
at docdb.AttributesController.createAttributes(AttributesController.java:118)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at javax.el.ELUtil.invokeMethod(ELUtil.java:304)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:535)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.invoke(AstValue.java:285)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.module.web.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.module.web.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:107)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 36 more
]]
答案 0 :(得分：8)
如果@NamedQueries是一个问题，我会感到非常惊讶，名称表明它应该是@NamedQuery个项目的列表/数组。
尝试：
@Column(name = "name", length = 128)
private String name;
看到你是知己，你实际上没有重复@size，也许我们应该看看功能的重叠，@Column注释包含相同的功能，也许这可能是导致冲突。
答案 1 :(得分：3)
我遇到同样的问题，但是我的问题来自pom.xml文件。我有两个jpa依赖项
dat %>%
inner_join(dat %>% select(TrxID, partner_value = Quant), by = c("TrxID")) %>%
filter(Quant != partner_value)
#> TrxID Items Quant partner_value
#> 1 Trx1 A Yes Maybe
#> 2 Trx1 B Maybe Yes
#> 3 Trx2 E No Yes
#> 4 Trx2 B Yes No
#> 5 Trx3 B Definitely Yes
#> 6 Trx3 C Yes Definitely
#> 7 Trx5 F No Maybe
#> 8 Trx5 D Maybe No
我删除了第一个，这解决了我的问题。对不起，我的英语水平
答案 2 :(得分：1)
在pom.xml文件中，删除：
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>2.5.2</version>
<scope>provided</scope>
</dependency>
答案 3 :(得分：1)
此处的答案已经讨论了解决此问题的可能解决方案，因此，我将专注于就问题的根本原因分享我的发现。
在使用Netbeans 8.2生成实体并勾选“创建持久性单元”框后，我遇到了这个问题。执行此过程会导致将两个依赖项添加到pom.xml中的项目中，即org.eclipse.persistence.jpa.modelgen.processor和eclipselink。
添加到我的项目中的这些EclipseLink依赖项具有bug issue that was reported：
... @Column注释似乎突然不再与其他注释兼容。
此错误的结果是，您将因此无法将@Column注释与@NotNull或@Size一起使用。
答案 4 :(得分：0)
此错误在IDE级别存在。例如，在字段userName上标注为：
@NotNull
@Size(max = 255)
@Column(name = "user_id", nullable = false, length = 255)
private String userName;
将抛出由@Size和length = 255触发的重复错误，并且很可能是如果未在数据库中设置user_id的大小有效性；如果尚未在数据库中设置@NotNull约束，则nullable = false和not nullable也很有可能。请注意，默认情况下，如果有效性不是不是来自数据库，NetBeans会在实体自动生成时将String字段的长度验证为 255 。更正引发的错误：
@Column(name = "user_id", nullable = false, length = 255)
private String userName;
OR
@NotNull
@Size(max = 255)
@Column(name = "user_id")
private String userName;
答案 5 :(得分：0)
在我的情况下，我需要下一个依赖项：
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>2.7.4</version>
<scope>provided</>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.5.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
我删除了：
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>2.7.4</version>
<scope>provided</>
</dependency>
现在可以正常工作了。
答案 6 :(得分：0)
还要检查一下，如果您使用的是Lombok @Data批注，它不会干扰JPA约束/定义-就我而言，我必须删除NoArgsConstructor之类的构造函数批注，以便正确处理实体{{3 }}
答案 7 :(得分：-1)
我遇到了同样的错误，我解决了从权利中删除@NotNull注释的问题。