Why JPA doesnt generate a join junction table in this case - jpa

Question

I have two tables Students and Books , with a many to many relationship. The code of both are given below. Now when I try to run the code I get the error.
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'acme.book_stud' doesn't exist
Error Code: 1146
Call: INSERT INTO book_stud (idStudents, idBooks) VALUES (?, ?)
bind => [2 parameters bound]
It seems like JPA is trying to write to a juction table which does not exist (in this case it assumes a junction table books_students is already created so it doesnt create one.). It works if I create a books_students but I dont want to do that since its JPA responsibility to create it. Is there a way in which I could explicitly tell it to create one. ? (I am taking a wild guess here - but I guess when creating a persitance unit I specified "none" I think thats why it didnt create that table . Am I correct ? Anyways here are my Student and Books Classes
BOOKS CLASS
#Entity
#Table(name = "books")
#XmlRootElement
#NamedQueries({
#NamedQuery(name = "Books.findAll", query = "SELECT b FROM Books b"),
#NamedQuery(name = "Books.findByIdBooks", query = "SELECT b FROM Books b WHERE b.idBooks = :idBooks"),
#NamedQuery(name = "Books.findByBookName", query = "SELECT b FROM Books b WHERE b.bookName = :bookName"),
#NamedQuery(name = "Books.findByBookType", query = "SELECT b FROM Books b WHERE b.bookType = :bookType")})
public class Books implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#Basic(optional = false)
#NotNull
#Size(min = 1, max = 45)
#Column(name = "idBooks")
private String idBooks;
#Size(max = 45)
#Column(name = "BookName")
private String bookName;
#Size(max = 45)
#Column(name = "BookType")
private String bookType;
/******************************************ADDED **********************/
#ManyToMany
#JoinTable(name = "book_stud",
joinColumns = { #JoinColumn(name = "idStudents") },
inverseJoinColumns = { #JoinColumn(name = "idBooks") })
/**************************************ENDED*****************************/
public Books() {
}
public Books(String idBooks) {
this.idBooks = idBooks;
}
public String getIdBooks() {
return idBooks;
}
public void setIdBooks(String idBooks) {
this.idBooks = idBooks;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getBookType() {
return bookType;
}
public void setBookType(String bookType) {
this.bookType = bookType;
}
#Override
public int hashCode() {
int hash = 0;
hash += (idBooks != null ? idBooks.hashCode() : 0);
return hash;
}
#Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Books)) {
return false;
}
Books other = (Books) object;
if ((this.idBooks == null && other.idBooks != null) || (this.idBooks != null && !this.idBooks.equals(other.idBooks))) {
return false;
}
return true;
}
#Override
public String toString() {
return "domain.Books[ idBooks=" + idBooks + " ]";
}
}
STUDENT CLASS
#Entity
#Table(name = "students")
#XmlRootElement
#NamedQueries({
#NamedQuery(name = "StudentEnroll.findAll", query = "SELECT s FROM StudentEnroll s"),
#NamedQuery(name = "StudentEnroll.findByIdStudents", query = "SELECT s FROM StudentEnroll s WHERE s.idStudents = :idStudents"),
#NamedQuery(name = "StudentEnroll.findByName", query = "SELECT s FROM StudentEnroll s WHERE s.name = :name"),
#NamedQuery(name = "StudentEnroll.findByRoll", query = "SELECT s FROM StudentEnroll s WHERE s.roll = :roll"),
#NamedQuery(name = "StudentEnroll.findBySsn", query = "SELECT s FROM StudentEnroll s WHERE s.ssn = :ssn"),
#NamedQuery(name = "StudentEnroll.findByProgram", query = "SELECT s FROM StudentEnroll s WHERE s.program = :program")})
public class StudentEnroll implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#Basic(optional = false)
#NotNull
#Size(min = 1, max = 40)
#Column(name = "idStudents")
private String idStudents;
#Size(max = 45)
#Column(name = "Name")
private String name;
#Column(name = "Roll")
private Integer roll;
#Column(name = "SSN")
private Integer ssn;
#Size(max = 45)
#Column(name = "Program")
private String program;
#JoinColumn(name = "CustomerID", referencedColumnName = "UserID")
#ManyToOne
private Customer customerID;
//#OneToMany(mappedBy = "studentRoll")
#OneToMany(mappedBy = "studentRoll",cascade = CascadeType.REMOVE)//added REMOVE
private Collection<Subject> subjectCollection;
/**************************ADDED*****************************/
#ManyToMany
#JoinTable(name = "book_stud",
joinColumns = { #JoinColumn(name = "idBooks") },
inverseJoinColumns = { #JoinColumn(name = "idStudents") })
/**********************************END**********************/
public StudentEnroll() {
}
public StudentEnroll(String idStudents) {
this.idStudents = idStudents;
}
public String getIdStudents() {
return idStudents;
}
public void setIdStudents(String idStudents) {
this.idStudents = idStudents;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getRoll() {
return roll;
}
public void setRoll(Integer roll) {
this.roll = roll;
}
public Integer getSsn() {
return ssn;
}
public void setSsn(Integer ssn) {
this.ssn = ssn;
}
public String getProgram() {
return program;
}
public void setProgram(String program) {
this.program = program;
}
public Customer getCustomerID() {
return customerID;
}
public void setCustomerID(Customer customerID) {
this.customerID = customerID;
}
#XmlTransient
public Collection<Subject> getSubjectCollection() {
return subjectCollection;
}
public void setSubjectCollection(Collection<Subject> subjectCollection) {
this.subjectCollection = subjectCollection;
}
#Override
public int hashCode() {
int hash = 0;
hash += (idStudents != null ? idStudents.hashCode() : 0);
return hash;
}
#Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof StudentEnroll)) {
return false;
}
StudentEnroll other = (StudentEnroll) object;
if ((this.idStudents == null && other.idStudents != null) || (this.idStudents != null && !this.idStudents.equals(other.idStudents))) {
return false;
}
return true;
}
#Override
public String toString() {
return "domain.StudentEnroll[ idStudents=" + idStudents + " ]";
}
}