我创建了一个为用户保存数据的实体类。JSF 的支持 bean 包含创建和存储实体实例的 persist 方法。我从 JSF 页面调用此方法。我不想让这篇文章变得冗长和混乱，所以我只会发布这两个类和 jsf 页面。是时候进入 jsf 页面时，我收到一条错误消息： javax.persistence.TransactionRequiredException 我尝试以几种方式更改代码，但仍然无法正常工作。这里有什么问题？
import javax.ejb.TransactionAttribute;
import static javax.ejb.TransactionAttributeType.REQUIRES_NEW;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.transaction.SystemException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.WebTarget;
/**
*
* @author David Jennings
*/
@ManagedBean(name = "formbean")
@RequestScoped
public class DataBean {
/**
* Creates a new instance of DataBean
*/
public DataBean() {
}
DataBean(String firstName,
String middleName,
String lastName,
String birthDay,
String birthMonth,
String birthYear,
String unit,
String street,
String city,
String state,
String zipCode) {
this.firstName = firstName;
this.middleName = middleName;
this.lastName = lastName;
this.birthDay = birthDay;
this.birthMonth = birthMonth;
this.birthYear = birthYear;
this.unit = unit;
this.street = street;
this.city = city;
this.state = state;
this.zipCode = zipCode;
}
@PersistenceContext
EntityManager em ;
private String result;
private String firstName;
private String middleName;
private String lastName;
private String birthDay;
private String birthMonth;
private String birthYear;
private String unit;
private String street;
private String city;
private String state;
private String zipCode;
@TransactionAttribute(REQUIRES_NEW)
public void persist() throws SystemException {
em.persist(new DataBean(this.firstName, this.middleName, this.lastName, this.birthDay, this.birthMonth, this.birthYear, this.unit, this.street, this.city, this.state, this.zipCode));
}
/**
* @return the firstName
*/
public String getFirstName() {
return firstName;
}
/**
* @param firstName the firstName to set
*/
public void setFirstName(String firstName) {
this.firstName = firstName;
}
/**
* @return the middleName
*/
public String getMiddleName() {
return middleName;
}
/**
* @param middleName the middleName to set
*/
public void setMiddleName(String middleName) {
this.middleName = middleName;
}
/**
* @return the lastName
*/
public String getLastName() {
return lastName;
}
/**
* @param lastName the lastName to set
*/
public void setLastName(String lastName) {
this.lastName = lastName;
}
/**
* @return the birthDay
*/
public String getBirthDay() {
return birthDay;
}
/**
* @param birthDay the birthDay to set
*/
public void setBirthDay(String birthDay) {
this.birthDay = birthDay;
}
/**
* @return the birthMonth
*/
public String getBirthMonth() {
return birthMonth;
}
/**
* @param birthMonth the birthMonth to set
*/
public void setBirthMonth(String birthMonth) {
this.birthMonth = birthMonth;
}
/**
* @return the birthYear
*/
public String getBirthYear() {
return birthYear;
}
/**
* @param birthYear the birthYear to set
*/
public void setBirthYear(String birthYear) {
this.birthYear = birthYear;
}
/**
* @return the unit
*/
public String getUnit() {
return unit;
}
/**
* @param unit the unit to set
*/
public void setUnit(String unit) {
this.unit = unit;
}
/**
* @return the street
*/
public String getStreet() {
return street;
}
/**
* @param street the street to set
*/
public void setStreet(String street) {
this.street = street;
}
/**
* @return the city
*/
public String getCity() {
return city;
}
/**
* @param city the city to set
*/
public void setCity(String city) {
this.city = city;
}
/**
* @return the state
*/
public String getState() {
return state;
}
/**
* @param state the state to set
*/
public void setState(String state) {
this.state = state;
}
/**
* @return the zipCode
*/
public String getZipCode() {
return zipCode;
}
/**
* @param zipCode the zipCode to set
*/
public void setZipCode(String zipCode) {
this.zipCode = zipCode;
}
/**
* @return the result
*/
public String getResult() {
return result;
}
/**
*/
public void setResult() {
WebTarget webTarget;
Client client;
String BASE_URI = "http://localhost:8080/DataForm/webresources/";
client = javax.ws.rs.client.ClientBuilder.newClient();
webTarget = client.target(BASE_URI).path("generic");
WebTarget resource = webTarget;
result = resource.request(javax.ws.rs.core.MediaType.TEXT_HTML).get(String.class);
}
}
实体类：
@Entity
public class DataEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String firstName;
private String middleName;
private String lastName;
private String birthDay;
private String birthMonth;
private String birthYear;
private String unit;
private String street;
private String city;
private String states;
private String zipCode;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@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 DataEntity)) {
return false;
}
DataEntity other = (DataEntity) 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 "entity.DataEntity[ id=" + id + " ]";
}
/**
* @return the firstName
*/
public String getFirstName() {
return firstName;
}
/**
* @param firstName the firstName to set
*/
public void setFirstName(String firstName) {
this.firstName = firstName;
}
/**
* @return the middleName
*/
public String getMiddleName() {
return middleName;
}
/**
* @param middleName the middleName to set
*/
public void setMiddleName(String middleName) {
this.middleName = middleName;
}
/**
* @return the lastName
*/
public String getLastName() {
return lastName;
}
/**
* @param lastName the lastName to set
*/
public void setLastName(String lastName) {
this.lastName = lastName;
}
/**
* @return the birthDay
*/
public String getBirthDay() {
return birthDay;
}
/**
* @param birthDay the birthDay to set
*/
public void setBirthDay(String birthDay) {
this.birthDay = birthDay;
}
/**
* @return the birthMonth
*/
public String getBirthMonth() {
return birthMonth;
}
/**
* @param birthMonth the birthMonth to set
*/
public void setBirthMonth(String birthMonth) {
this.birthMonth = birthMonth;
}
/**
* @return the birthYear
*/
public String getBirthYear() {
return birthYear;
}
/**
* @param birthYear the birthYear to set
*/
public void setBirthYear(String birthYear) {
this.birthYear = birthYear;
}
/**
* @return the unit
*/
public String getUnit() {
return unit;
}
/**
* @param unit the unit to set
*/
public void setUnit(String unit) {
this.unit = unit;
}
/**
* @return the street
*/
public String getStreet() {
return street;
}
/**
* @param street the street to set
*/
public void setStreet(String street) {
this.street = street;
}
/**
* @return the city
*/
public String getCity() {
return city;
}
/**
* @param city the city to set
*/
public void setCity(String city) {
this.city = city;
}
/**
* @return the states
*/
public String getStates() {
return states;
}
/**
* @param states the states to set
*/
public void setStates(String states) {
this.states = states;
}
/**
* @return the zipCode
*/
public String getZipCode() {
return zipCode;
}
/**
* @param zipCode the zipCode to set
*/
public void setZipCode(String zipCode) {
this.zipCode = zipCode;
}
}
JSF：
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html">
<h:head>
#{formbean.persist()}
</h:head>
<h:body>
<img src="city-logo.jpg" width="200" height="100" alt="city-logo"/>
<br/>
#{formbean.setResult()}
<h:outputText value="#{formbean.result}" escape="false"/>
</h:body>
</html>