I just started learning Spring Boot by reading the book Spring Boot in Action and I am learning the examples of this book, trying to run them myself but I have a problem using JpaRepository.findOne().
I've gone allover the Chapter to find my possible mismatches. However, it just DO NOT work.
The project is supposed to be a simple Reading List.
Here is the code :
The Reader @Entity:
package com.lixin.readinglist;
import org.springframework.data.annotation.Id;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import javax.persistence.Entity;
import java.util.Collection;
import java.util.Collections;
/**
* @author lixin
*/
@Entity
public class Reader implements UserDetails {
private static final long serialVersionUID = 1L;
@Id
private String username;
private String fullname;
private String password;
@Override
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getFullname() {
return fullname;
}
public void setFullname(String fullname) {
this.fullname = fullname;
}
@Override
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
return Collections.singletonList(new SimpleGrantedAuthority("READER"));
}
@Override
public boolean isAccountNonExpired() {
return true;
}
@Override
public boolean isAccountNonLocked() {
return true;
}
@Override
public boolean isCredentialsNonExpired() {
return true;
}
@Override
public boolean isEnabled() {
return true;
}
}
The Jpa interface:
package com.lixin.readinglist;
import org.springframework.data.jpa.repository.JpaRepository;
/**
* @author lixin
*/
public interface ReaderRepository extends JpaRepository<Reader, String> {
}
The SecurityConfig:
package com.lixin.readinglist;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
/**
* @author lixin
*/
@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
private final ReaderRepository readerRepository;
@Autowired
public SecurityConfig(ReaderRepository readerRepository) {
this.readerRepository = readerRepository;
}
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.authorizeRequests()
.antMatchers("/").access("hasRole('READER')")
.antMatchers("/**").permitAll()
.and()
.formLogin()
.loginPage("/login")
.failureUrl("/login?error=true");
}
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth
.userDetailsService((UserDetailsService) username -> readerRepository.findOne(username));
}
}
And I kept getting this ERROR:
Error:(40, 86) java: method findOne in interface org.springframework.data.repository.query.QueryByExampleExecutor<T> cannot be applied to given types;
required: org.springframework.data.domain.Example<S>
found: java.lang.String
reason: cannot infer type-variable(s) S
(argument mismatch; java.lang.String cannot be converted to org.springframework.data.domain.Example<S>)
