I give a complete sample to explain my issue.
@Entity
public class Student {
@Id @Column(name="id", length=128, nullable=false) private String id;
@Column(name="sName", length=255) private String sName;
@ManyToMany
@JoinTable(
name="student_course_map",
joinColumns={@JoinColumn(name="student_id", referencedColumnName="id",
nullable=false)},
inverseJoinColumns={@JoinColumn(name="course_id",
referencedColumnName="id", nullable=false)}
)
public Collection getCourses()
...
}
@Entity
public class Courses{
@Id @Column(name="id", length=128, nullable=false) private String id;
@Column(name="cName", length=255) private String cName;
...
}
We can see the student id length has been defined to 128. And there is no
definition length in the JoinColumn student_id. The JoinColumn should be set
to the default value 255.
The warning message will occur like this
WARN [Schema] Existing column "student_id" on table
"test.student_course_map" is incompatible with the same column in the given
schema definition. Existing column:
Full Name: student_course_map.student_id
Type: varchar
Size: 128
Default: null
Not Null: true
Given column:
Full Name: student_course_map.student_id
Type: varchar
Size: 255
Default: null
Not Null: true
--
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