我遇到这种情况:
@Entity
@Configurable(preConstruction=true)
public class User extends AbstractBussinessObject implements Serializable {
@OneToMany(mappedBy = "user", fetch = FetchType.LAZY)
private List<Warrior> warriors;
...
public class UserDto extends AbstractDto implements Serializable{
private List<WarriorDto> warriors;
private String name;
private String password;
public UserDto() {}
public UserDto(Long id, List<WarriorDto> warriors, String name, String password) {
this.warriors = warriors;
...
@Entity
public class Warrior extends AbstractBussinessObject implements Serializable{
@JoinColumn(name = "user_id")
@ManyToOne
private User user;
...
public class WarriorDto extends AbstractDto implements Serializable{
private User user;
...
WarriorServiceImpl 中的@Transactional(readOnly = true)
public List<WarriorDto> getAllWarriors() {
List<Warrior> wars = null;
List<WarriorDto> warsDto = new ArrayList<WarriorDto>();
try {
wars = genericDao.getAll(Warrior.class);
if (wars != null) {
for (Warrior war : wars) {
warsDto.add(createWarriorDto(war));
}
}
} catch (Exception e) {}
return warsDto;
}
DAO @SuppressWarnings("unchecked")
@Override
public <ENTITY> List<ENTITY> getAll(Class<ENTITY> clazz) {
return getEntityManager().createQuery(
"SELECT e FROM " + clazz.getSimpleName() + " e")
.getResultList();
}
<!-- Connection pool -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="initialSize" value="2" />
<property name="minIdle" value="2" />
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="databasePlatform" value="${jpa.platform}" />
<property name="generateDdl" value="true" />
<property name="showSql" value="true" />
</bean>
</property>
<property name="packagesToScan" value="cz.sutak.game" />
</bean>
<bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<!-- Podpora deklarativni demarkace transakci - anotace @Transactional -->
<tx:annotation-driven transaction-manager="txManager" mode="aspectj" />
<bean id="transactionTemplate"
class="org.springframework.transaction.support.TransactionTemplate">
<property name="transactionManager">
<ref bean="txManager" />
</property>
</bean>
https://github.com/sutakjakub/game
如果我想在小部件中调用WarriorService.Util.getInstance().getAllWarriors(
new AsyncCallback<List<WarriorDto>>()
,则会显示以下消息:com.google.gwt.user.client.rpc.StatusCodeException:500服务器上的调用失败;请参阅服务器日志了解详情
在Jetty只有这样的信息:[ERROR] 500 - POST /游戏/战士(127.0.0.1)57字节
没有错误消息。 是序列化问题(util.List)?你有什么想法吗? 非常感谢你。
编辑: 这是终端中的错误消息(对不起,我没看到):
错误LazyInitializationException - 懒得初始化角色集合:cz.sutak.game.client.bo.User.warriors,没有关闭会话或会话
答案 0 :(得分:1)
问题是在客户端,Hibernate无法获取您使用fetch = FetchType.LAZY
标记的属性。您需要在服务器端急切地获取它们,然后在通过线路传递对象图之前将Hibernate代理置空。
请参阅另一个主题中的my answer以获取有关将Hibernate代理置零的提示。
干杯,
答案 1 :(得分:0)
这里正如你所说的那样与GWT
无关,因为它的服务器端代码。即使在客户端GWT也支持Util.List
。
回到原来的问题。它与行wars = genericDao.getAll(Warrior.class);
访问此行时,没有hibernate session
已打开。