延迟加载不适用于eclipselink中的ManyToOne
地址与人有多对一的关系，如：
人：
@Id @Column(name="personid") private Long personId; private String firstName; private String lastName; private String email; @OneToMany(cascade = CascadeType.ALL,mappedBy="person",targetEntity=Address.class,fetch=FetchType.LAZY) private List addressArray=new ArrayList(); public Person() { } 和地址：
@ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name="personId") private Person person;
我想从地址对象访问人的名字，如“address.person.firstname”，但它总是急于加载这个人？
我也尝试使用maven静态编织它我的pom.xml包含：
maven-antrun-plugin process-classes run
还在persistence.xml中添加了
我也试过动态编织，但它给出了exception：
java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:382) at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:397) Caused by: java.lang.NoClassDefFoundError: javax/persistence/spi/PersistenceUnitInfo at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:186) at org.eclipse.persistence.internal.jpa.deployment.JavaSECMPInitializerAgent.initializeFromAgent(JavaSECMPInitializerAgent.java:44) at org.eclipse.persistence.internal.jpa.deployment.JavaSECMPInitializerAgent.premain(JavaSECMPInitializerAgent.java:39) ... 6 more Caused by: java.lang.ClassNotFoundException: javax.persistence.spi.PersistenceUnitInfo at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:423) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ... 10 more FATAL ERROR in native method: processing of -javaagent failed Exception in thread "main"
我的静态编织类文件显示以下方法但仍然不起作用：
在weaving = static和logging = FINEST时，请在编织后检查我的日志
[EL Finest]: jpa: 2013-09-26 18:07:40.453--ServerSession(8941730)--Thread(Thread[main,5,main])--Begin predeploying Persistence Unit TestDB; session file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/_TestDB; state Initial; factoryCount 0 [EL Finest]: properties: 2013-09-26 18:07:40.475--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.orm.throw.exceptions; default value=true [EL Finest]: properties: 2013-09-26 18:07:40.475--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.weaving.changetracking; default value=true [EL Finest]: properties: 2013-09-26 18:07:40.476--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.weaving.lazy; default value=true [EL Finest]: properties: 2013-09-26 18:07:40.476--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.weaving.eager; default value=false [EL Finest]: properties: 2013-09-26 18:07:40.476--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.weaving.fetchgroups; default value=true [EL Finest]: properties: 2013-09-26 18:07:40.476--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.weaving.internal; default value=true [EL Finest]: properties: 2013-09-26 18:07:40.476--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.weaving.rest; default value=true [EL Finest]: properties: 2013-09-26 18:07:40.477--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.multitenant.tenants-share-emf; default value=true [EL Finest]: properties: 2013-09-26 18:07:40.478--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.multitenant.tenants-share-cache; default value=false [EL Finer]: metadata: 2013-09-26 18:07:40.496--ServerSession(8941730)--Thread(Thread[main,5,main])--Searching for default mapping file in file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/ (There is no English translation for this message.) [EL Finer]: metadata: 2013-09-26 18:07:40.5--ServerSession(8941730)--Thread(Thread[main,5,main])--Searching for default mapping file in file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/ (There is no English translation for this message.) [EL Config]: metadata: 2013-09-26 18:07:40.681--ServerSession(8941730)--Thread(Thread[main,5,main])--The access type for the persistent class [class com.altametrics.persistence.services.Address] is set to [FIELD]. [EL Config]: metadata: 2013-09-26 18:07:40.723--ServerSession(8941730)--Thread(Thread[main,5,main])--The target entity (reference) class for the many to one mapping element [field person] is being defaulted to: class com.altametrics.persistence.services.Person. [EL Config]: metadata: 2013-09-26 18:07:40.725--ServerSession(8941730)--Thread(Thread[main,5,main])--The access type for the persistent class [class com.altametrics.persistence.services.Person] is set to [FIELD]. [EL Config]: metadata: 2013-09-26 18:07:40.733--ServerSession(8941730)--Thread(Thread[main,5,main])--The alias name for the entity class [class com.altametrics.persistence.services.Address] is being defaulted to: Address. [EL Config]: metadata: 2013-09-26 18:07:40.735--ServerSession(8941730)--Thread(Thread[main,5,main])--The table name for entity [class com.altametrics.persistence.services.Address] is being defaulted to: ADDRESS. [EL Config]: metadata: 2013-09-26 18:07:40.759--ServerSession(8941730)--Thread(Thread[main,5,main])--The column name for element [id] is being defaulted to: ID. [EL Config]: metadata: 2013-09-26 18:07:40.761--ServerSession(8941730)--Thread(Thread[main,5,main])--The column name for element [addressLine2] is being defaulted to: ADDRESSLINE2. [EL Config]: metadata: 2013-09-26 18:07:40.762--ServerSession(8941730)--Thread(Thread[main,5,main])--The column name for element [addressLine1] is being defaulted to: ADDRESSLINE1. [EL Config]: metadata: 2013-09-26 18:07:40.762--ServerSession(8941730)--Thread(Thread[main,5,main])--The alias name for the entity class [class com.altametrics.persistence.services.Person] is being defaulted to: Person. [EL Config]: metadata: 2013-09-26 18:07:40.762--ServerSession(8941730)--Thread(Thread[main,5,main])--The table name for entity [class com.altametrics.persistence.services.Person] is being defaulted to: PERSON. [EL Config]: metadata: 2013-09-26 18:07:40.763--ServerSession(8941730)--Thread(Thread[main,5,main])--The column name for element [id] is being defaulted to: ID. [EL Config]: metadata: 2013-09-26 18:07:40.763--ServerSession(8941730)--Thread(Thread[main,5,main])--The column name for element [lastName] is being defaulted to: LASTNAME. [EL Config]: metadata: 2013-09-26 18:07:40.763--ServerSession(8941730)--Thread(Thread[main,5,main])--The column name for element [email] is being defaulted to: EMAIL. [EL Config]: metadata: 2013-09-26 18:07:40.764--ServerSession(8941730)--Thread(Thread[main,5,main])--The column name for element [firstName] is being defaulted to: FIRSTNAME. [EL Config]: metadata: 2013-09-26 18:07:40.785--ServerSession(8941730)--Thread(Thread[main,5,main])--The primary key column name for the mapping element [field person] is being defaulted to: ID. [EL Finer]: weaver: 2013-09-26 18:07:40.805--ServerSession(8941730)--Thread(Thread[main,5,main])--Class [com.altametrics.persistence.services.Address] registered to be processed by weaver. [EL Finer]: weaver: 2013-09-26 18:07:40.807--ServerSession(8941730)--Thread(Thread[main,5,main])--Class [com.altametrics.persistence.services.Person] registered to be processed by weaver. [EL Finest]: jpa: 2013-09-26 18:07:40.809--ServerSession(8941730)--Thread(Thread[main,5,main])--End predeploying Persistence Unit TestDB; session file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/_TestDB; state Predeployed; factoryCount 0 [EL Finer]: weaver: 2013-09-26 18:07:40.81--Thread(Thread[main,5,main])--JavaSECMPInitializer - transformer is null. [EL Finest]: jpa: 2013-09-26 18:07:40.81--ServerSession(8941730)--Thread(Thread[main,5,main])--Begin predeploying Persistence Unit TestDB; session file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/_TestDB; state Predeployed; factoryCount 0 [EL Finest]: jpa: 2013-09-26 18:07:40.81--ServerSession(8941730)--Thread(Thread[main,5,main])--End predeploying Persistence Unit TestDB; session file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/_TestDB; state Predeployed; factoryCount 1 [EL Finest]: jpa: 2013-09-26 18:07:40.815--ServerSession(8941730)--Thread(Thread[main,5,main])--Begin deploying Persistence Unit TestDB; session file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/_TestDB; state Predeployed; factoryCount 1 [EL Finer]: 2013-09-26 18:07:40.829--ServerSession(8941730)--Thread(Thread[main,5,main])--Could not initialize Validation Factory. Encountered following exception: java.lang.NoClassDefFoundError: javax/validation/Validation [EL Finest]: properties: 2013-09-26 18:07:40.831--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.logging.level; value=FINEST; translated value=FINEST [EL Finest]: properties: 2013-09-26 18:07:40.832--ServerSession(8941730)--Thread(Thread[main,5,main])--property=eclipselink.logging.level; value=FINEST; translated value=FINEST [EL Finest]: properties: 2013-09-26 18:07:40.837--ServerSession(8941730)--Thread(Thread[main,5,main])--property=javax.persistence.jdbc.user; value=root [EL Finest]: properties: 2013-09-26 18:07:40.837--ServerSession(8941730)--Thread(Thread[main,5,main])--property=javax.persistence.jdbc.password; value=xxxxxx [EL Finest]: properties: 2013-09-26 18:07:41.502--ServerSession(8941730)--Thread(Thread[main,5,main])--property=javax.persistence.jdbc.driver; value=com.mysql.jdbc.Driver [EL Finest]: properties: 2013-09-26 18:07:41.502--ServerSession(8941730)--Thread(Thread[main,5,main])--property=javax.persistence.jdbc.url; value=jdbc:mysql://localhost:3306/sample [EL Info]: 2013-09-26 18:07:41.506--ServerSession(8941730)--Thread(Thread[main,5,main])--EclipseLink, version: Eclipse Persistence Services - 2.5.0.v20130507-3faac2b [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.757--Thread(Thread[main,5,main])--(?i)oracle.*12 (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.757--Thread(Thread[main,5,main])--(?i)oracle.*11 (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.757--Thread(Thread[main,5,main])--(?i)oracle.*10 (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.758--Thread(Thread[main,5,main])--(?i)oracle.*9 (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.758--Thread(Thread[main,5,main])--(?i)oracle.* (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.758--Thread(Thread[main,5,main])--SQL\ Anywhere.* (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.758--Thread(Thread[main,5,main])--(?i)(sybase.*)|(adaptive\ server\ enterprise.*)|(SQL\ Server.*) (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.759--Thread(Thread[main,5,main])--(?i)microsoft.* (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.759--Thread(Thread[main,5,main])--(?i).*derby.* (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.759--Thread(Thread[main,5,main])--(?i).*db2.* (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.759--Thread(Thread[main,5,main])--(?i)pointbase.* (There is no English translation for this message.) [EL Finest]: dbPlatformHelper_regExprDbPlatform: 2013-09-26 18:07:41.759--Thread(Thread[main,5,main])--(?i)mysql.* (There is no English translation for this message.) [EL Fine]: connection: 2013-09-26 18:07:41.76--Thread(Thread[main,5,main])--Detected database platform: org.eclipse.persistence.platform.database.MySQLPlatform [EL Config]: connection: 2013-09-26 18:07:41.771--ServerSession(8941730)--Connection(7521179)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( platform=>MySQLPlatform user name=> "root" datasource URL=> "jdbc:mysql://localhost:3306/sample" )) [EL Config]: connection: 2013-09-26 18:07:41.783--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://localhost:3306/sample User: root@localhost Database: MySQL Version: 5.1.39-community Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.18 ( Revision: tonci.grgin@oracle.com-20110930151701-jfj14ddfq48ifkfq ) [EL Finest]: connection: 2013-09-26 18:07:41.783--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--Connection acquired from connection pool [default]. [EL Finest]: connection: 2013-09-26 18:07:41.783--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--Connection released to connection pool [default]. [EL Info]: connection: 2013-09-26 18:07:41.828--ServerSession(8941730)--Thread(Thread[main,5,main])--file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/_TestDB login successful [EL Finer]: metamodel: 2013-09-26 18:07:41.841--ServerSession(8941730)--Thread(Thread[main,5,main])--Canonical Metamodel class [com.altametrics.persistence.services.Person_] not found during initialization. [EL Finer]: metamodel: 2013-09-26 18:07:41.842--ServerSession(8941730)--Thread(Thread[main,5,main])--Canonical Metamodel class [com.altametrics.persistence.services.Address_] not found during initialization. [EL Finest]: jpa: 2013-09-26 18:07:41.842--ServerSession(8941730)--Thread(Thread[main,5,main])--End deploying Persistence Unit TestDB; session file:/C:/Users/achyut_anr/achyut_anr/CheckWeaving/bin/_TestDB; state Deployed; factoryCount 1 [EL Finer]: connection: 2013-09-26 18:07:41.863--ServerSession(8941730)--Thread(Thread[main,5,main])--client acquired: 3812334 [EL Finer]: transaction: 2013-09-26 18:07:41.872--ClientSession(3812334)--Thread(Thread[main,5,main])--acquire unit of work: 25692210 [EL Finest]: query: 2013-09-26 18:07:41.887--UnitOfWork(25692210)--Thread(Thread[main,5,main])--Execute query ReadObjectQuery(name="readAddress" referenceClass=Address sql="SELECT ID, ADDRESSLINE1, ADDRESSLINE2, personid FROM ADDRESS WHERE (ID = ?)") [EL Finest]: connection: 2013-09-26 18:07:41.889--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--Connection acquired from connection pool [default]. [EL Fine]: sql: 2013-09-26 18:07:41.889--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--SELECT ID, ADDRESSLINE1, ADDRESSLINE2, personid FROM ADDRESS WHERE (ID = ?) bind => [1] [EL Finest]: connection: 2013-09-26 18:07:41.913--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--Connection released to connection pool [default]. [EL Finest]: query: 2013-09-26 18:07:41.917--ServerSession(8941730)--Thread(Thread[main,5,main])--Execute query ReadObjectQuery(name="person" referenceClass=Person ) [EL Finest]: connection: 2013-09-26 18:07:41.917--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--Connection acquired from connection pool [default]. [EL Fine]: sql: 2013-09-26 18:07:41.918--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--SELECT ID, EMAIL, FIRSTNAME, LASTNAME FROM PERSON WHERE (ID = ?) bind => [1] [EL Finest]: connection: 2013-09-26 18:07:41.919--ServerSession(8941730)--Connection(27722152)--Thread(Thread[main,5,main])--Connection released to connection pool [default]. [EL Finest]: transaction: 2013-09-26 18:07:41.922--UnitOfWork(25692210)--Thread(Thread[main,5,main])--Register the existing object personId=1
我的持久性单元看起来像：
org.eclipse.persistence.jpa.PersistenceProvider com.altametrics.persistence.services.Person com.altametrics.persistence.services.Address false <!-- -->
某些惰性关系需要编织，并在EclipseLink中启用其他性能增强，例如获取组和更改跟踪，如http://www.eclipse.org/eclipselink/documentation/2.4/concepts/app_dev007.htm中所述。
编织通常在EE 7容器内自动进行，但需要在容器外或非EE7容器中进行。 因此，为了懒惰地在1：1和M：1上工作，您需要通过使用代理动态编织，或静态编织类文件然后使用它们。