I pom.xml
Fehler mit JPA persistence.xml Kein Persistence Provider für EntityManager
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>net.vyhn</groupId>
<artifactId>jpa</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>jpa Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.core</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.2</version>
</dependency>
</dependencies>
<build>
<finalName>jpa</finalName>
</build>
</project>
Employee.java
package example.com.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
@Entity
public class Employee {
@Id
@GeneratedValue
private Long id;
private String name;
@ManyToOne
private Department department;
public Employee() {
}
public Employee(String name, Department department) {
this.name = name;
this.department = department;
}
public Employee(String name) {
this.name = name;
}
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 Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
@Override
public String toString() {
return "Employee [id=" + id + ", name=" + name + ", department="
+ department.getName() + "]";
}
}
Department.java
package example.com.domain;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import java.util.ArrayList;
import java.util.List;
@Entity
public class Department {
@Id
@GeneratedValue
private Long id;
private String name;
@OneToMany(mappedBy = "department", cascade = CascadeType.PERSIST)
private List<Employee> employees = new ArrayList<Employee>();
public Department() {
super();
}
public Department(String name) {
this.name = name;
}
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 List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
}
JpaTest.java
package example.com.jpa;
import example.com.domain.Department;
import example.com.domain.Employee;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import java.util.List;
public class JpaTest {
private EntityManager manager;
public JpaTest(EntityManager manager) {
this.manager = manager;
}
public static void main(String[] args) {
EntityManagerFactory factory = Persistence.createEntityManagerFactory("persistenceUnit");
EntityManager manager = factory.createEntityManager();
JpaTest test = new JpaTest(manager);
EntityTransaction tx = manager.getTransaction();
tx.begin();
try {
test.createEmployees();
} catch (Exception e) {
e.printStackTrace();
}
tx.commit();
test.listEmployees();
System.out.println(".. done");
}
private void createEmployees() {
int numOfEmployees = manager.createQuery("Select a From Employee a", Employee.class).getResultList().size();
if (numOfEmployees == 0) {
Department department = new Department("java");
manager.persist(department);
manager.persist(new Employee("Jakab Gipsz", department));
manager.persist(new Employee("Captain Nemo", department));
}
}
private void listEmployees() {
List<Employee> resultList = manager.createQuery("Select a From Employee a", Employee.class).getResultList();
System.out.println("num of employess:" + resultList.size());
for (Employee next : resultList) {
System.out.println("next employee: " + next);
}
}
}
Wenn ich JpaTest.java
laufen, Fehler hat:
"C:\Program Files\Java\jdk1.8.0_92\bin\java" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.1.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_92\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_92\jre\lib\rt.jar;C:\Users\Administrator\IdeaProjects\demo_jpa\target\classes;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\eclipselink\2.6.3\eclipselink-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\javax.persistence\2.1.1\javax.persistence-2.1.1.jar;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\commonj.sdo\2.1.1\commonj.sdo-2.1.1.jar;C:\Users\Administrator\.m2\repository\javax\validation\validation-api\1.1.0.Final\validation-api-1.1.0.Final.jar;C:\Users\Administrator\.m2\repository\org\glassfish\javax.json\1.0.4\javax.json-1.0.4.jar;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\org.eclipse.persistence.core\2.6.3\org.eclipse.persistence.core-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\org.eclipse.persistence.asm\2.6.3\org.eclipse.persistence.asm-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\org.eclipse.persistence.jpa\2.6.3\org.eclipse.persistence.jpa-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\org.eclipse.persistence.antlr\2.6.3\org.eclipse.persistence.antlr-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\eclipse\persistence\org.eclipse.persistence.jpa.jpql\2.6.3\org.eclipse.persistence.jpa.jpql-2.6.3.jar;C:\Users\Administrator\.m2\repository\javax\persistence\persistence-api\1.0.2\persistence-api-1.0.2.jar;C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\6.0.2\mysql-connector-java-6.0.2.jar;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.1.2\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain example.com.jpa.JpaTest
Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named persistenceUnit
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:85)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at example.com.jpa.JpaTest.main(JpaTest.java:20)
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:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Hilf mir, diesen Fehler zu beheben, danke!
Ja, wir meinen Screenshot (Projektstruktur) –
sehen Versuchen persistence.xml in Ressourcenordner – mubeen
Sie haben eine Nachricht über persistence.xml setzen, aber nicht Posting gestört diese Datei ?! –