Java 使用支持 bean 和 jsf 的 EE 持久化实体

Question

我创建了一个保存用户数据的实体 class。 JSF 的支持 bean 包含用于创建和存储实体实例的 persist 方法。我从 JSF 页面调用此方法。我不想让这个 post 冗长和混乱，所以我只会 post 那两个 classes 和 jsf 页面。当转到 jsf 页面时，我收到一条错误消息：javax.persistence.TransactionRequiredException 我已经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Class:

@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>

Answer 1

这个 post 将回答您的问题： JPA and JSF: right way of injecting EntityManager

长话短说：您尝试在 EJB 之外使用需要容器管理事务的 EntityManager。

Java 使用支持 bean 和 jsf 的 EE 持久化实体

Java EE Persisting Entitys using backing beans and jsf

jsf

persistence

entity

backing-beans

java-ee-7