java ee - JPA: Problem with persisting Foreign Key Constraint -

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मुझे दो इकाई मिली:

ग्राहक इकाई 

  @ एंटीटी सार्वजनिक वर्ग के ग्राहक {@Id @GeneratedValue (strategy = GenerationType.AUTO) निजी लांग आईडी; निजी स्ट्रिंग का नाम; @OneToMany (मैप किए गए = "ग्राहक", कैसकेड = कैस्केड टाइप। एएल) निजी सूची & lt; सुविधा & gt; सुविधाओं; // नाम और सुविधाओं के लिए सेटर और गेटर्स सार्वजनिक शून्य addFacility (सुविधा सुविधा) {this.facilities.add (सुविधा); }}

सुविधा इकाई 

  @ एंटीटी सार्वजनिक वर्ग की सुविधा {@Id @ generatedValue (strategy = GenerationType.AUTO) निजी लांग आईडी; @ManyToOne @JoinColumn (नाम = "CUSTOMER_FK") निजी ग्राहक ग्राहक; निजी स्ट्रिंग का नाम; // सेटर और गेटर, बराबर और हैशोड ...}

तो मेरे मुख्य में मैं यह करता हूं 

  ग्राहक ग्राहक = नया ग्राहक (); Customer.setName ("वेक वन विश्वविद्यालय"); सुविधा सुविधा = नई सुविधा (); Facility.setName ("टॉम क्रूज़"); EntityManager entityManager = Perseverence.createEntityManagerFactory ("EntityClassPU")। CreateEntityManager (); entityManager.getTransaction () शुरू ()।; customer.addFacility (सुविधा); entityManager.persist (ग्राहक); entityManager.getTransaction () के लिए प्रतिबद्ध ()।;   
  वेक वन विश्वविद्यालय  सफलतापूर्वक  ग्राहक  में सम्मिलित है, और  टॉम क्रूज़  सफलतापूर्वक  सुविधा , हालांकि अंदर  सुविधा ,  CUSTOMER_FK  मूल्य शून्य है, जो सुझाव देते हैं कि मैं विदेशी कुंजी संधि जारी रहती है।  ग्राहक  और   
 
 
 > सुविधा  एक द्वि-दिशात्मक सहयोग है, आप <मजबूत> अवश्य  एसोसिएशन के दोनों पक्षों को प्रबंधित कर सकते हैं। आप इसे मैन्युअल रूप से कर सकते हैं लेकिन मैं इसे  addFacility ()  विधि में करने का सुझाव देता हूं: 
 
  सार्वजनिक शून्य addFacility (सुविधा सुविधा) {if (this.facilities == null ) {This.facilities = नया ArrayList & lt; सुविधा & gt; (); } This.facilities.add (सुविधा); facility.setCustomer (this); // वह भाग है जिसे आप वर्तमान में याद कर रहे हैं}

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