BeanCreationException

Alguém pode me ajuda. Eu estou aprendendo Spring Boot e tomei essa exception:

2021-02-19 16:54:34.364 ERROR 19316 — [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Failed to initialize JPA EntityManagerFactory: Use of @OneToMany or @ManyToMany targeting an unmapped class: taking.api.TipoProblema.chamados[taking.api.Chamados]
2021-02-19 16:54:34.365 WARN 19316 — [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘entityManagerFactory’ defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: taking.api.TipoProblema.chamados[taking.api.Chamados]
2021-02-19 16:54:34.369 INFO 19316 — [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated…
2021-02-19 16:54:34.396 INFO 19316 — [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
2021-02-19 16:54:34.399 INFO 19316 — [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2021-02-19 16:54:34.412 INFO 19316 — [ restartedMain] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
2021-02-19 16:54:34.452 ERROR 19316 — [ restartedMain] o.s.boot.SpringApplication : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘entityManagerFactory’ defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: taking.api.TipoProblema.chamados[taking.api.Chamados]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1159) ~[spring-context-5.3.3.jar:5.3.3]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) ~[spring-context-5.3.3.jar:5.3.3]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.3.jar:5.3.3]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1311) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300) ~[spring-boot-2.4.2.jar:2.4.2]
at taking.api.ApiApplication.main(ApiApplication.java:16) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.4.2.jar:2.4.2]
Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: taking.api.TipoProblema.chamados[taking.api.Chamados]
at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1332) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:870) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:795) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:53) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1693) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1661) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:295) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1224) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1255) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1847) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1784) ~[spring-beans-5.3.3.jar:5.3.3]
… 22 common frames omitted

Classe Chamados:

import java.io.Serializable;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;

public class Chamados implements Serializable{
private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String descricao;
@Lob
private byte[] anexo;
private String nomeAnexo;
private String tipoAnexo;
private String status;
private String dataCriacao;

@ManyToOne
@JoinColumn(name = "problema_id")
private TipoProblema problema;

@ManyToOne
@JoinColumn(name = "usuario_id")
private Usuarios usuario;

public Chamados() {
}

public Long getId() {
	return id;
}

public void setId(Long id) {
	this.id = id;
}

public String getDescricao() {
	return descricao;
}

public void setDescricao(String descricao) {
	this.descricao = descricao;
}

public byte[] getAnexo() {
	return anexo;
}

public void setAnexo(byte[] anexo) {
	this.anexo = anexo;
}

public String getNomeAnexo() {
	return nomeAnexo;
}

public void setNomeAnexo(String nomeAnexo) {
	this.nomeAnexo = nomeAnexo;
}

public String getTipoAnexo() {
	return tipoAnexo;
}

public void setTipoAnexo(String tipoAnexo) {
	this.tipoAnexo = tipoAnexo;
}

public String getStatus() {
	return status;
}

public void setStatus(String status) {
	this.status = status;
}

public String getDataCriacao() {
	return dataCriacao;
}

public void setDataCriacao(String dataCriacao) {
	this.dataCriacao = dataCriacao;
}

public TipoProblema getProblema() {
	return problema;
}

public void setProblema(TipoProblema problema) {
	this.problema = problema;
}

public Usuarios getUsuario() {
	return usuario;
}

public void setUsuario(Usuarios usuario) {
	this.usuario = usuario;
}

}

Classe TipoProblema:

import java.io.Serializable;

import java.util.List;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

@Entity
public class TipoProblema implements Serializable{
private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String tipoDoProblema;
private String areaResponsavel;

@OneToMany(mappedBy = "problema")
private List<Chamados> chamados;

public TipoProblema() {
}

public TipoProblema(String tipoDoProblema, String areaResponsavel) {
	super();
	this.tipoDoProblema = tipoDoProblema;
	this.areaResponsavel = areaResponsavel;
}

public Long getId() {
	return id;
}

public void setId(Long id) {
	this.id = id;
}

public String getTipoDoProblema() {
	return tipoDoProblema;
}

public void setTipoDoProblema(String tipoDoProblema) {
	this.tipoDoProblema = tipoDoProblema;
}

public String getAreaResponsavel() {
	return areaResponsavel;
}

public void setAreaResponsavel(String areaResponsavel) {
	this.areaResponsavel = areaResponsavel;
}

}

Classe Usuarios:

import java.io.Serializable;

import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

@Entity
public class Usuarios implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;

@OneToMany(mappedBy = "usuario")
private List<Chamados> chamados;

@Column(name = "username")
private String username;

private String email;

@Column(name = "senha")
private String senha;

private String nome;

private String endereco;

private String cep;

private String telefone;

private String cpf;

private String rg;

public Long getId() {
	return id;
}

public void setId(Long id) {
	this.id = id;
}

public String getUsername() {
	return username;
}

public void setUsername(String username) {
	this.username = username;
}

public String getEmail() {
	return email;
}

public void setEmail(String email) {
	this.email = email;
}

public String getSenha() {
	return senha;
}

public void setSenha(String senha) {
	this.senha = senha;
}

public String getNome() {
	return nome;
}

public void setNome(String nome) {
	this.nome = nome;
}

public String getEndereco() {
	return endereco;
}

public void setEndereco(String endereco) {
	this.endereco = endereco;
}

public String getCep() {
	return cep;
}

public void setCep(String cep) {
	this.cep = cep;
}

public String getTelefone() {
	return telefone;
}

public void setTelefone(String telefone) {
	this.telefone = telefone;
}

public String getCpf() {
	return cpf;
}

public void setCpf(String cpf) {
	this.cpf = cpf;
}

public String getRg() {
	return rg;
}

public void setRg(String rg) {
	this.rg = rg;
}

}

Eu acho que tem um erro no relacionamento mas eu não estou conseguindo resolve.

Sua entidade não está anotada com @Entity.

Valeu, nem percebi.