org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name ‘tag_ArticleRepository‘:
Invocation of init method failed; 
nested exception is java.lang.IllegalArgumentException: 
Failed to create query method 
public abstract java.util.List com.fdzang.mblog.repository.Tag_ArticleRepository.getByTag_oId(java.lang.String)! 
No property tag found for type Tag_Article!

package com.fdzang.mblog.repository;

import com.fdzang.mblog.pojo.Tag_Article;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface Tag_ArticleRepository extends JpaRepository<Tag_Article,String> {
    List<Tag_Article> getByTag_oId(String tag_oId);
}

 @Query("SELECT ta FROM tag_article ta WHERE ta.tag_oId = :tag_oId")
    List<Tag_Article> getByTag_oId(@Param("tag_oId") String tag_oId);

tag_article is not mapped

 @Query("SELECT ta FROM Tag_Article ta WHERE ta.tag_oId = :tag_oId")
    List<Tag_Article> getByTag_oId(@Param("tag_oId") String tag_oId);