com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`grades_book_db`.`grades`, CONSTRAINT `FK_Grades_Subject` FOREIGN KEY (`Subject_Id`) REFERENCES `subjects` (`Subject_Id`))

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Root Cause Analysis

  1. com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException

    Cannot add or update a child row: a foreign key constraint fails (`grades_book_db`.`grades`, CONSTRAINT `FK_Grades_Subject` FOREIGN KEY (`Subject_Id`) REFERENCES `subjects` (`Subject_Id`))

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0()
  2. Java RT
    Constructor.newInstance
    1. sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    2. sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    3. sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    4. java.lang.reflect.Constructor.newInstance(Unknown Source)
    4 frames
  3. MySQL jdbc
    PreparedStatement.executeUpdate
    1. com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
    2. com.mysql.jdbc.Util.getInstance(Util.java:408)
    3. com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
    4. com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3970)
    5. com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3906)
    6. com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524)
    7. com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677)
    8. com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549)
    9. com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
    10. com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073)
    11. com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2009)
    12. com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5098)
    13. com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1994)
    13 frames
  4. Hibernate
    ResultSetReturnImpl.executeUpdate
    1. org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:204)
    1 frame