merge not needed
em.merge(stud1); is not needed because the line Student stud1 = em.find(Student.class,1); makes stud1 managed, so a commit is all you need 

Global connection in java
Pls tell me how to create global connection in core java.  

JPA
JPA  Sir, I have tried making the jpa application which you have given on this site . But then also I m facing problem in that like : If i make...:\Users\WAHEGURU\Downloads\Compressed\netbeansjpaexamples_2\JPACRUD\build\classes 

Need Jar in the JPA examples
/jpa/ http://www.roseindia.net/jpa/jpacrud/index.shtml http://www.roseindia.net...Need Jar in the JPA examples  JPA - tutorial is good, very easy to understand and simple. But to run the examples, the jar/helping files are needed 

JPA Architecture
entity merge ? this method is used to update the sate of entity into database... JPA Architecture       JPA Architecture: In this section we will discuss the architecture 

JPA update data Example
JPA update data Example       In this section, you know how to update the database data through the jpa... JPA merge() method Follow the following steps 

JPA Relationship
held in this field would be persist, remove, delete or update. Download JPA... JPA Relationship          In this section, you will know about the jpa 

JPA
JPA  HOW CAN I WRITE A SIMPLE PROGRAM IN NETBEANS CONSOLE ON JPA ON CRUD APPLICATION? HOW CAN I START KINDLY HELP ME 

JPA
JPA   I HAVE MADE A PROJECT IN I HAVE MADE ONE - ONE RELATION MY CODE IS ALSO RIGHT FROM MY POINT OF VIEW. AND WHEN I RUN IT IS GIVING ME THE MESSAGE AS BELOW::::::: run: [EL Info]: 2012-02-27 09:42:36.466--ServerSession 

JPA update data
JPA update data       In this section, you know how to update the database data through the jpa. You follow the following steps for updating the data. Create " 

JPA update data
JPA update data       In this section, you know how to update the database data through the jpa. You follow the following steps for updating the data. Create "JPAUpdate" 

JPA update data
JPA update data       In this section, you know how to update the database data through the jpa. You follow the following steps for updating the data. 1--Create