exception has been throw
时间: 2024-05-23 12:13:11 浏览: 13
I'm sorry, could you please provide more context or information about the exception that has been thrown? This will help me better understand the issue and provide a more accurate response.
相关问题
Li Na has been asked to create a Web application, in which she has to integrate the Spring framework with Hibernate. To do this, Li Na has to configure the SessionFactory object in the Spring configuration file. For this, she has created a Spring configuration file named Spring-Hibernate.xml. Which of the following code snippets should she use to configure the SessionFactory object?@Beanpublic SessionFactoryBean sessionFactory(){create session factorysSessionFactoryBean sessionFactory = new SessionFactoryBean();A// set the propertiessessionFactory.setDataSource(myDataSource());sessionFactory.setPackagesToScan(env.getProperty("hibernate.packagesToScan"));sessionFactory.setHibernateProperties(getHibernateProperties());return sessionFactory;
Li Na should use the following code snippet to configure the SessionFactory object in the Spring configuration file:
```
@Bean
public SessionFactory sessionFactory() throws Exception {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(myDataSource());
sessionFactory.setPackagesToScan(env.getProperty("hibernate.packagesToScan"));
sessionFactory.setHibernateProperties(getHibernateProperties());
sessionFactory.afterPropertiesSet();
return sessionFactory.getObject();
}
```
This code snippet creates a LocalSessionFactoryBean object and sets its properties using the `setDataSource`, `setPackagesToScan`, and `setHibernateProperties` methods. It then calls the `afterPropertiesSet` method to initialize the SessionFactory object, and returns it using the `getObject` method.
Note that the `sessionFactory` method should throw an exception of type `Exception`, as the `afterPropertiesSet` method may throw an exception during initialization.
Action 2: adding a new user to the library. When the user of the software specifies action 2, your program must add a new user to the library. To add a new user, your program needs to ask the user three things: the role of user (an integer read using readPosInt: the integer 1 represents lender, the integer 2 represents borrower, any other integer must result in an error message "Unknown user role!" being printed and the software going immediately back to the main menu), the name of the user (a string read using readLine), and the initial number of books that the user lends (for a lender) or borrows (for a borrower). You program must then create the correct user, add it to the library, and print an information message. The program then goes back to the menu. For example (where 2, 3, 2, 1, Anna, 5, 2, 2, Bob, and 10 are inputs from the user): Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 2 Type the user role (lender:1 borrower:2): 3 Unknown user role! Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 2 Type the user role (lender:1 borrower:2): 1 Enter the name of the user: Anna Enter the initial number of borrowed books: 5 Lender "Anna" lending 5 book(s) has been added. Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 2 Type the user role (lender:1 borrower:2): 2 Enter the name of the user: Bob Enter the initial number of borrowed books: 10 Borrower "Bob" borrowing 10 book(s) has been added. Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): Note that the readPosInt method prevents the initial number of books from being negative, so the constructor for the Borrower class will never throw a NotALenderException when you create a borrower object. Nevertheless the code of the main method of your CLI class must handle this exception by printing the error message "BUG! This must never happen!" and immediately terminating the program using System.exit(1);
Here's the code for action 2:
```java
case 2:
System.out.println("Type the user role (lender:1 borrower:2):");
int role = readPosInt(input); // read user's role
if (role == 1) { // lender
System.out.println("Enter the name of the user:");
String name = readLine(input); // read user's name
System.out.println("Enter the initial number of books lent:");
int numBooks = readPosInt(input); // read number of books lent
Lender lender = new Lender(name, numBooks); // create lender object
library.addUser(lender); // add lender to the library
System.out.println("Lender \"" + name + "\" lending " + numBooks + " book(s) has been added.");
} else if (role == 2) { // borrower
System.out.println("Enter the name of the user:");
String name = readLine(input); // read user's name
System.out.println("Enter the initial number of books borrowed:");
int numBooks = readPosInt(input); // read number of books borrowed
Borrower borrower = new Borrower(name, numBooks); // create borrower object
library.addUser(borrower); // add borrower to the library
System.out.println("Borrower \"" + name + "\" borrowing " + numBooks + " book(s) has been added.");
} else { // unknown role
System.out.println("Unknown user role!");
}
break;
```
Note that this code assumes that the `Library` object is already initialized and stored in a variable called `library`. Also, the `readPosInt` and `readLine` methods are not shown here, but they should behave as described in the problem statement. Finally, make sure to handle the `NotALenderException` as described in the problem statement.