getting below mention Exception while executing the query(Spring Boot+JPA+Hibernate) - spring

Question

This is the error received when try to execute the sample query. Please help me to get out of this.
org.hibernate.hql.internal.ast.QuerySyntaxException: Transaction is not mapped
below is the entity class with mapping
Transaction.java
package org.npst.mb.entity;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import org.springframework.stereotype.Component;
#Entity
#Table(name="transaction")
public class Transaction implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="transactionid")
private int transactionid;
#Column(name="appid")
private int appid;
public int getTransactionid() {
return transactionid;
}
public void setTransactionid(int transactionid) {
this.transactionid = transactionid;
}
public int getAppid() {
return appid;
}
public void setAppid(int appid) {
this.appid = appid;
}
}
Install .java(Spring Boot App Stater)
package org.npst.mb.install;
import org.npst.mb.controller.JobLauncherController;
import org.npst.mb.dao.TransactionDao;
import org.npst.mb.service.TransactionService;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ImportResource;
#SpringBootApplication
#EnableBatchProcessing
#ImportResource("classpath:batchjob.xml")
#ComponentScan(basePackages ={"org.npst.mb.entity.*"},basePackageClasses= {TransactionService.class,TransactionDao.class,JobLauncherController.class})
public class Install {
public static void main(String[] args) {
SpringApplication.run(Install.class, args);
}
}
DAOIMPL(Query to interact with DB)
package org.npst.mb.dao.impl;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.npst.mb.dao.TransactionDao;
import org.npst.mb.entity.Transaction;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
#Transactional
#Repository
public class TransactionDaoImpl implements TransactionDao {
#PersistenceContext
private EntityManager entityManager;
#Override
public boolean addTransaction(Transaction txndata) {
return true;
}
#Override
public long getMaxTid() {
try {
System.out.println("maxtxnid::");
String hql="from Transaction where transactionid > 0";
entityManager.createQuery(hql).getMaxResults();
return 0;
}
catch(Exception sql) {
System.out.println(sql.getMessage());
sql.printStackTrace();
return 0;
}
}
}
application.properties
spring.datasource.url=jdbc:mysql://localhost:3306/test1
spring.datasource.username=root
spring.datasource.password=naveen123
spring.datasource.tomcat.max-wait=20000
spring.datasource.tomcat.max-active=50
spring.datasource.tomcat.max-idle=20
spring.datasource.tomcat.min-idle=15
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect
spring.jpa.properties.hibernate.id.new_generator_mappings = false
spring.jpa.properties.hibernate.format_sql = true
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=create
spring.data.jpa.repositories.enabled=true
spring.jpa.open-in-view=true
logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE

Answer 1

As I understand, #ComponentScan scans and creates beans for the classes annotated #Component, #Service, #Controller,#Repository.
#EntityScan annotation is used to identify JPA entities(persistent classes).
Can you try by adding #EntityScan("org.npst.mb.entity")?