Java EntityManager为空
我是EJB新手,创建一个有趣的应用程序/学习EJB下面是代码Java EntityManager为空,java,jpa,ejb,entitymanager,zk,Java,Jpa,Ejb,Entitymanager,Zk,我是EJB新手,创建一个有趣的应用程序/学习EJB下面是代码 @Entity @Table(name = "PERSON", schema = "experiment") @NamedQuery(name = "Person.fetchAllPerson" , query = "select p from Person p") public class Person implements Serializable { private static final long serialVe
@Entity
@Table(name = "PERSON", schema = "experiment")
@NamedQuery(name = "Person.fetchAllPerson" , query = "select p from Person p")
public class Person implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "id")
private Long id;
@Column(name = "name", length = 500)
private String name;
@Column(name = "age")
private Integer age;
public Long getId() {
return id;
}
// public void setId(Long id) {
// this.id = id;
// }
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@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 Person)) {
return false;
}
Person other = (Person) 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 "Person id ::: "+this.id + " | "+"name ::: "+this.name+" | "+"age ::: "+this.age;
}
}
上面是实体类:::
下面是我的bean(SessionBean)::
下面是我的persistence.xml:::
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="OCDPU" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:/jndi_postgresql2</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="hibernate.show_sql" value="true" />
</properties>
</persistence-unit>
</persistence>
我正在使用JBoss AS 7.1.1 final。我在其中创建了一个连接池。它连接到我局域网上的数据库。
不知道出了什么问题。先谢谢你
我想我在pom.xml中遗漏了一些东西
这是我的pom:::
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.discusit</groupId>
<artifactId>OrgChartDemo</artifactId>
<version>1.0</version>
<packaging>war</packaging>
<name>OrgChartDemo</name>
<properties>
<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>6.0</version>
<scope>provided</scope>
</dependency>
<!-- ZK DEPENDENCIES -->
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zkplus</artifactId>
<version>6.5.2</version>
</dependency>
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zhtml</artifactId>
<version>6.5.2</version>
</dependency>
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zkbind</artifactId>
<version>6.5.2</version>
</dependency>
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zul</artifactId>
<version>6.5.2</version>
</dependency>
<!-- ZK Dependencies ends -->
<!-- log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- log4j ends -->
<!-- javax.persistence 2.0 implementation -->
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
</dependency>
<!-- javax.persistence 2.0 ends -->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArguments>
<endorseddirs>${endorsed.dir}</endorseddirs>
</compilerArguments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<outputDirectory>${endorsed.dir}</outputDirectory>
<silent>true</silent>
<artifactItems>
<artifactItem>
<groupId>javax</groupId>
<artifactId>javaee-endorsed-api</artifactId>
<version>6.0</version>
<type>jar</type>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
4.0.0
com.discusit
OrgChartDemo
1
战争
OrgChartDemo
${project.build.directory}/project
UTF-8
爪哇
javaeewebapi
6
假如
org.zkoss.zk
zkplus
6.5.2
org.zkoss.zk
zhtml
6.5.2
org.zkoss.zk
zkbind
6.5.2
org.zkoss.zk
祖尔
6.5.2
log4j
log4j
1.2.17
org.hibernate.javax.persistence
hibernate-jpa-2.0-api
1.0.1.最终版本
org.apache.maven.plugins
maven编译器插件
2.3.2
1.6
1.6
${annowed.dir}
org.apache.maven.plugins
maven战争插件
2.1.1
错误的
org.apache.maven.plugins
maven依赖插件
2.1
验证
复制
${annowed.dir}
符合事实的
爪哇
javaee认可的api
6
罐子
像这样的资源注入:
@PersistenceContext(unitName = "OCDPU")
private EntityManager em;
仅适用于其生命周期由容器管理的客户机类,即EJB、JSF ManagedBean、CDIBean或servlet。在您的例子中,客户机类PersonSessionBean
是一个EJB,这没关系。错误出现在PersonSessionBean
的实例化中:
psb = PersonSessionBean.getPersonSessionBean();
这一行是错误的,因为EJB应该通过@EJB
注释注入:
@EJB PersonSessionBean psb;
或通过JNDI查找检索
但是您还必须知道,客户机类Index2Controller也是容器管理的,从发布的代码来看,情况似乎并非如此
有用的链接:来自Oracle的Java EE 6教程。资源注入如下:
@PersistenceContext(unitName = "OCDPU")
private EntityManager em;
仅适用于其生命周期由容器管理的客户机类,即EJB、JSF ManagedBean、CDIBean或servlet。在您的例子中,客户机类PersonSessionBean
是一个EJB,这没关系。错误出现在PersonSessionBean
的实例化中:
psb = PersonSessionBean.getPersonSessionBean();
这一行是错误的,因为EJB应该通过@EJB
注释注入:
@EJB PersonSessionBean psb;
或通过JNDI查找检索
但是您还必须知道,客户机类Index2Controller也是容器管理的,从发布的代码来看,情况似乎并非如此
有用的链接:来自Oracle的Java EE 6教程。客户机类Index2控制器由ZK引擎管理,而不是由容器管理,这就是我编写sb=PersonSessionBean.getPersonSessionBean()的原因;我没有找到任何其他方法来获得一个不由容器管理的类中的bean。感谢您的回复如果您仔细查看stacktrace的第一行,它自己说PersonSessionBean正在创建,问题在于注入实体管理器。感谢您的回复。是的,但由于上述原因,entity manager注入失败。不幸的是,在这个问题上我再也帮不上忙了,因为我从未使用过ZK。客户机类Index2Controller由ZK引擎管理,而不是由容器管理,这就是我编写sb=PersonSessionBean.getPersonSessionBean()的原因;我没有找到任何其他方法来获得一个不由容器管理的类中的bean。感谢您的回复如果您仔细查看stacktrace的第一行,它自己说PersonSessionBean正在创建,问题在于注入实体管理器。感谢您的回复。是的,但由于上述原因,entity manager注入失败。不幸的是,在这个问题上我再也帮不上忙了,因为我从未与ZK合作过。