我正在使用JAX-RS和MySql数据库（JPA）构建API。 我有以下方法验证用户名和密码并为会话创建令牌：
<build>
<finalName>desired_jar_name</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>my.main.class</mainClass>
</transformer>
</transformers>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
此方法由以下方式调用和使用：
public Customer validateCustomer(Customer customer) {
//get the customer from the database
Query q = em.createQuery("SELECT c from Customer c WHERE c.login = :username");
q.setParameter("username", customer.getLogin());
List<Customer> results = q.getResultList();
//check if user exsists
if(!results.isEmpty()){
Customer fromDb = results.get(0);
//check if user provided correct password
if (!fromDb.getPassword().equals(customer.getPassword())) {
return null;
} else {
//create the session token and save it to the database
Random random = new SecureRandom();
String token = new BigInteger(130, random).toString(32);
tx.begin();
int executeUpdate = em.createQuery("UPDATE Customer c SET c.token = :token WHERE c.id = :id")
.setParameter("token", token)
.setParameter("id", fromDb.getId())
.executeUpdate();
tx.commit();
em.close();
//update previously pulled customer with the token
fromDb.setToken(token);
//return the customer
return fromDb;
}
} else {
return null;
}
}
我的问题是每当提供正确的登录时我都会返回
从Db返回;
我在浏览器中收到内部服务器错误500：
HTTP ERROR 500
访问/ api / users / login时出现问题。原因是：
内部服务器错误
由Jetty提供：//
但是，当我从数据库返回原始客户时，只会出现错误。如果我从数据库返回的同一个对象构建新的Customer对象并返回它，它工作得很好。
public Response login (Customer customer){
Customer c = customerService.validateCustomer(customer);
if (c != null){
return Response.status(Response.Status.OK).entity(c).build();
//System.out.println(c);
} else {
return Response.status(Response.Status.FORBIDDEN).entity("Incorrect username or password.").build();
}
}
返回c代替fromDb可以正常工作。
是否有任何理由说明数据库中的对象可能返回与构建它的对象不同的结果？
从DB2返回时的服务器日志（获取错误）：
Customer c = new Customer();
c.setEmail(fromDb.getEmail());
c.setLogin(fromDb.getLogin());
c.setToken(token);
c.setId(fromDb.getId());
返回c时出现错误日志（无错误）
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
INFO: HHH000115: Hibernate connection pool size: 20
INFO: HHH000006: Autocommit mode: true
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/test]
INFO: HHH000046: Connection properties: {user=root, autocommit=true, release_mode=auto}
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
INFO: HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory
INFO: HHH000397: Using ASTQueryTranslatorFactory
INFO: HHH000228: Running hbm2ddl schema update
INFO: HHH000102: Fetching database metadata
INFO: HHH000396: Updating schema
INFO: HHH000261: Table found: test.account
INFO: HHH000037: Columns: [balance, name, id, accnumber, sortcode]
INFO: HHH000108: Foreign keys: []
INFO: HHH000126: Indexes: [primary]
INFO: HHH000261: Table found: test.customer
INFO: HHH000037: Columns: [password, city, street, county, name, id, login, email, token]
INFO: HHH000108: Foreign keys: []
INFO: HHH000126: Indexes: [primary]
INFO: HHH000261: Table found: test.customer_account
INFO: HHH000037: Columns: [account_id, customer_id]
INFO: HHH000108: Foreign keys: [fk70eacecc22b4f18d, fk70eacecc3a281067]
INFO: HHH000126: Indexes: [fk70eacecc22b4f18d, fk70eacecc3a281067, account_id]
INFO: HHH000261: Table found: test.hibernate_sequences
INFO: HHH000037: Columns: [sequence_next_hi_value, sequence_name]
INFO: HHH000108: Foreign keys: []
INFO: HHH000126: Indexes: []
INFO: HHH000232: Schema update complete
WARN: HHH000436: Entity manager factory name (Bank) is already registered. If entity manager will be clustered or passivated, specify a unique value for property 'hibernate.ejb.entitymanager_factory_name'
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
INFO: HHH000115: Hibernate connection pool size: 20
INFO: HHH000006: Autocommit mode: true
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/test]
INFO: HHH000046: Connection properties: {user=root, autocommit=true, release_mode=auto}
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
INFO: HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory
INFO: HHH000397: Using ASTQueryTranslatorFactory
INFO: HHH000228: Running hbm2ddl schema update
INFO: HHH000102: Fetching database metadata
INFO: HHH000396: Updating schema
INFO: HHH000261: Table found: test.account
INFO: HHH000037: Columns: [balance, name, id, accnumber, sortcode]
INFO: HHH000108: Foreign keys: []
INFO: HHH000126: Indexes: [primary]
INFO: HHH000261: Table found: test.customer
INFO: HHH000037: Columns: [password, city, street, county, name, id, login, email, token]
INFO: HHH000108: Foreign keys: []
INFO: HHH000126: Indexes: [primary]
INFO: HHH000261: Table found: test.customer_account
INFO: HHH000037: Columns: [account_id, customer_id]
INFO: HHH000108: Foreign keys: [fk70eacecc22b4f18d, fk70eacecc3a281067]
INFO: HHH000126: Indexes: [fk70eacecc22b4f18d, fk70eacecc3a281067, account_id]
INFO: HHH000261: Table found: test.hibernate_sequences
INFO: HHH000037: Columns: [sequence_next_hi_value, sequence_name]
INFO: HHH000108: Foreign keys: []
INFO: HHH000126: Indexes: []
INFO: HHH000232: Schema update complete
WARN: HHH000436: Entity manager factory name (Bank) is already registered. If entity manager will be clustered or passivated, specify a unique value for property 'hibernate.ejb.entitymanager_factory_name'
com.mycompany.bank.model.Customer@769f10ad
Returning: com.mycompany.bank.model.Customer@e501b7e
答案 0 :(得分：0)
首先，您的查询不正常：您无法在更新期间使用别名。试试em.createQuery("UPDATE Customer SET token = :token WHERE id = :id")