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JaVers object auditing and diff framework

There is a newer version: 7.6.2

package org.javers.spring.auditable.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.javers.common.collections.Optional;
import org.javers.core.Javers;
import org.javers.spring.annotation.JaversSpringDataAuditable;
import org.javers.spring.auditable.AspectUtil;
import org.javers.spring.auditable.AuthorProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.core.RepositoryMetadata;
import org.springframework.data.repository.core.support.DefaultRepositoryMetadata;

/**
 * Creates three @After advices.
 * 


 *
 * Commits all arguments passed to methods with @JaversAuditable annotation.
 * 


 *
 * For spring-data Repositories with @JaversSpringDataAuditable annotation: 

 * - commits all arguments passed to save() methods,  

 * - commits delete of arguments passed to delete() methods.  

 */
@Aspect
public class JaversAuditableRepositoryAspect {
    private final AuditChangeHandler saveHandler;
    private final AuditChangeHandler deleteHandler;
    private final JaversCommitAdvice javersCommitAdvice;

    public JaversAuditableRepositoryAspect(Javers javers, AuthorProvider authorProvider) {
        this(new OnSaveAuditChangeHandler(javers, authorProvider),
             new OnDeleteAuditChangeHandler(javers, authorProvider),
             new JaversCommitAdvice(javers,authorProvider) );
    }

    JaversAuditableRepositoryAspect(AuditChangeHandler saveHandler, AuditChangeHandler deleteHandler, JaversCommitAdvice javersCommitAdvice) {
        this.saveHandler = saveHandler;
        this.deleteHandler = deleteHandler;
        this.javersCommitAdvice = javersCommitAdvice;
    }

    @After("@annotation(org.javers.spring.annotation.JaversAuditable)")
    public void commitAdvice(JoinPoint pjp) {
        javersCommitAdvice.commitMethodArguments(pjp);
    }

    @After("execution(public * delete(..)) && this(org.springframework.data.repository.CrudRepository)")
    public void onDeleteExecuted(JoinPoint pjp)  {
        onVersionEvent(pjp, deleteHandler);
    }

    @After("execution(public * save(..)) && this(org.springframework.data.repository.CrudRepository)")
    public void onSaveExecuted(JoinPoint pjp) {
        onVersionEvent(pjp, saveHandler);
    }

    private void onVersionEvent(JoinPoint pjp, AuditChangeHandler handler) {
        Optional versionedInterface = getRepositoryInterface(pjp);
        if (versionedInterface.isEmpty()){
            return;
        }

        RepositoryMetadata metadata = getMetadata(versionedInterface.get());
        Iterable