Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2:java (default-cli) on project FrescoJPADemo: An exception occured while executing the Java class. null: InvocationTargetException: NullPointerException -> [Help 1]
- JPADemo.java
import javax.persistence.*; import frescojpa.Student; import java.util.*; public class JPADemo { public static void main(String[] args) { EntityManagerFactory emf = Persistence.createEntityManagerFactory("$objectdb/students.odb"); EntityManager entityManager = emf.createEntityManager(); entityManager.getTransaction( ).begin( ); try { Student student = new Student(1, "Ramesh"); entityManager.persist(student); Student student1 = new Student(2, "John"); entityManager.persist(student1); Student student2 = new Student(3, "Ali"); entityManager.persist(student2); System.out.println(entityManager.find(Student.class,1).getStudentName()); System.out.println(entityManager.find(Student.class,2).getStudentName()); System.out.println(entityManager.find(Student.class,3).getStudentName()); entityManager.getTransaction( ).commit( ); } finally { entityManager.close(); emf.close(); } } }
2.Student.java
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import java.io.Serializable;
@Entity
public class Student implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private int studentRollNumber;
private String studentName;
public Student(int studentRollNumber, String studentName) {
this.studentRollNumber = studentRollNumber;
this.studentName = studentName;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getStudentRollNumber() {
return studentRollNumber;
}
public void setStudentRollNumber(int studentRollNumber) {
this.studentRollNumber = studentRollNumber;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
}
pom.xml
<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>FrescoJPADemo</groupId>
<artifactId>FrescoJPADemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<repositories>
<repository>
<id>objectdb</id>
<name>ObjectDB Repository</name>
<url>https://m2.objectdb.com</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>com.objectdb</groupId>
<artifactId>objectdb</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.5.0-RC1</version>
<exclusions>
<exclusion>
<groupId>org.eclipse.persistence</groupId>
<artifactId>commonj.sdo</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<id>enhance</id>
<phase>process-classes</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>com.objectdb.Enhancer</mainClass>
<arguments>
<argument>student.*</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>student.Main</mainClass>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
score.java
import java.util.List;
import javax.persistence.*;
public class Score {
public static void main(String[] args) {
// TODO Auto-generated method stub
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("$objectdb/students.odb");
EntityManager em = emf.createEntityManager();
// Find the number of Student objects in the database:
Query q1 = em.createQuery("SELECT COUNT(p) FROM Student p");
System.out.println("Total Points: " + q1.getSingleResult());
// Retrieve all the Student objects from the database:
TypedQuery<Student> query =
em.createQuery("SELECT p FROM Student p", Student.class);
List<Student> results = query.getResultList();
int count=0;
for (Student p : results) {
String name=p.getStudentName();
if(name.equals("Ramesh") || name.equals("John") || name.equals("Ali")){
count++;
}
}
if(count>=3){
System.out.println("FS_SCORE:100%");
}else{
System.out.println("FS_SCORE:0%");
}
// Close the database connection:
em.close();
emf.close();
}
}
Getting Score 0 Please help I am not able to understand what's wrong in that, It is hackerrank problem
