使用@lazyToOne(lazyToOneOption.no_proxy)Hibernate惰性加载

Question

我们目前有几个@OneToOne关系，由于已知的惰性加载的限制，它们总是会急切地从反方向获取。

为了启用逆关系的延迟加载，我正在尝试启用构建时字节码检测。

到目前为止我所做的...

[INFO] --- maven-antrun-plugin:1.7:run (Instrument domain classes) @ MyApp-entities ---
[INFO] Executing tasks

instrument:
[instrument] starting instrumentation
[INFO] Executed tasks

    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "client", optional=false)
    @LazyToOne(LazyToOneOption.NO_PROXY)
    public ClientPrefs getClientPrefs() {
        return clientPrefs;
    }

    public void setClientPrefs(ClientPrefs clientPrefs) {
        this.clientPrefs = clientPrefs;
    }

private FieldHandler fieldHandler;

15:54:09,720 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 56) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Session
15:54:09,730 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 57) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Session
15:54:09,969 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 56) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Client
15:54:09,970 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 57) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Client
15:54:09,999 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 56) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Country
15:54:10,003 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 57) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Country
15:54:10,054 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 56) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Pool
15:54:10,054 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 57) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.Pool
15:54:10,569 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 56) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.User
15:54:10,624 INFO  [org.hibernate.tuple.entity.EntityMetamodel] (ServerService Thread Pool -- 57) HHH000157: Lazy property fetching available for: uk.co.myapp.entities.User

这些关系现在不再急切地加载...但是它们也不会延迟加载，它们只是静默地返回null。

我尝试从实体中删除fieldhandled接口和fieldhandler字段，因为我不确定是否需要这样做，在此之后，我在启动时不再获得'hhh000157:Lazy property fetching available for：'消息，并且默认情况下返回到急切加载。

我是不是漏了什么？hibernate文档并没有明确说明如何实际设置此功能

编辑：根据注释添加了Ant任务配置：

<build>
        <plugins>
               <plugin>
                    <artifactId>maven-antrun-plugin</artifactId>
                    <version>1.7</version>
                    <executions>
                        <execution>
                            <phase>process-classes</phase>
                            <id>Instrument domain classes</id>
                            <configuration>
                                <target name="instrument">
                                    <taskdef name="instrument"
                                        classname="org.hibernate.tool.instrument.javassist.InstrumentTask">
                                        <classpath>
                                            <path refid="maven.dependency.classpath" />
                                            <path refid="maven.plugin.classpath" />
                                        </classpath>
                                    </taskdef>
                                    <instrument verbose="true">
                                        <fileset dir="${project.build.outputDirectory}">
                                            <include name="MyApp-entities/co/uk/myapp/entities/*.class" />
                                        </fileset>
                                    </instrument>
                                </target>
                            </configuration>
                            <goals>
                                <goal>run</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>org.hibernate</groupId>
                            <artifactId>hibernate-core</artifactId>
                            <version>4.2.21.Final</version>
                        </dependency>

                        <dependency>
                            <groupId>org.javassist</groupId>
                            <artifactId>javassist</artifactId>
                            <version>3.18.1-GA</version>
                        </dependency>
                    </dependencies>
                </plugin>
           </plugins>
    </build>

Answer 1

@lazyToOne(lazyToOneOption.NO_Proxy)在persistance.xml中需要

懒惰，返回请求引用时加载的实际对象（对于该选项，字节码增强是强制的，如果类没有增强，则返回代理）应该避免使用该选项，除非您负担不起代理的使用

NO_PROXY选项