CODEWITHSUNDEEP
javaspringspring-bootspring-data-jpaservlet-filters
gemorra
gemorra

Reputation: 193

Accessing spring boot data jpa entity in filter

At the moment I'm trying to convert my servlet-based application to a spring boot application with controllers. After I set up a filter I encountered an "could not initialize proxy - no Session"-Exception, when accessing an entities function. (Here: The users method "isAdmin").

I set up a filter like this:

public class AdminFilter implements Filter {

  @Autowired
  UserRepository userRepository;

  @Override
  @Transactional
  public void doFilter(ServletRequest aRequest, ServletResponse aResponse, FilterChain aFilterChain)
        throws IOException, ServletException {
            User u = userRepository.getOne(5l).orElse(null);
            System.out.println(u.isAdmin());
    aFilterChain.doFilter(aRequest, aResponse);
  }

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
    SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,
            filterConfig.getServletContext());
  }

  @Override
  public void destroy() {
  }
}

Implemented the Filter interface and addded the Filter in an @Configuration tagged class to register the filter to "/admin":

@Configuration
public class SpringConfiguration {
@Bean
public FilterRegistrationBean adminRegistration() {
    FilterRegistrationBean registration = new FilterRegistrationBean();
    registration.setFilter(new AdminFilter());
    registration.addUrlPatterns("/admin/*");
    return registration;
   }
}

The Autowiring-Support is enabled by the following statement:

SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,
        filterConfig.getServletContext());

I tried to add @Transactional to the method and also added the OpenSessionInViewFilter - without success.

In my Controller-Beans (@Controller) I can access the function of the entity retrieved from an autowired repository without any problems.

The function just returns a value from the user entity:

public boolean isAdmin() {
    return admin;
}

Any ideas why I'm getting the error and how to fix it?

A stracktrace cut:

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:148) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:266) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:73) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at de.seeme.web.persistence.User_$$_jvst43d_a.isAdmin(User_$$_jvst43d_a.java) ~[bin/:na]

Greetings

gemorra

Upvotes: 2

Views: 2283

Answers (1)

gemorra
gemorra

Reputation: 193

damn. Tried it with userRepository.find(id) and everything works fine.

With getOne you will just get a reference to the entity containing only the id (for existence checks or similiar).

Difference between CrudRepository findOne() and JpaRepository getOne()

Upvotes: 2

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