下午增加数据库字段的时候出现了这个问题：
org.springframework.orm.jpa.JpaSystemException: could not deserialize; nested exception is org.hibernate.type.SerializationException: could not deserialize
……
Caused by: org.hibernate.type.SerializationException: could not deserialize
……
Caused by: java.io.EOFException
……
原因：一些外键关联的字段注解写错了。
@Column(name = "mch_id")
private Mch mch;
修改为：
@JoinColumn(name = "mch_id", referencedColumnName = "id", nullable = false, updatable=false)
@ManyToOne(optional = false, targetEntity = Mch.class)
private Mch mch;
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