Lazy loading does not works for ManyToOne in eclipselink

Question

Address has many-to-one relationship with person like :

Person :

@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() {

    }

and Address :

@ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="personId")
    private Person person;

I want to access person's firstname from the address object like "address.person.firstname" but it always eager load the person ?

I also tried to static weave it using maven my pom.xml contains :

<plugins>
        <artifactId>maven-antrun-plugin</artifactId>
     <executions>
       <execution>
         <phase>process-classes</phase>
         <configuration>
           <tasks>
             <java classname="org.eclipse.persistence.tools.weaving.jpa.StaticWeave"
                   classpathref="maven.runtime.classpath" fork="true">
               <arg line="-loglevel FINE -persistenceinfo src target/classes target/classes"/>
             </java>
           </tasks>
         </configuration>
         <goals>
           <goal>run</goal>
         </goals>
       </execution>
     </executions>
      </plugin>

        </plugins>

also added <property name="eclipselink.weaving" value="static"/> in persistence.xml

I also tried dynamic weaving but it gives 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"

My static woven class files show following methods but still does not work :

enter image description here

Please check my log after weaving when weaving=static and logging = FINEST

[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: [email protected] )
[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

My persistence unit looks like :

 <persistence-unit name="TestDB">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>com.altametrics.persistence.services.Person</class>      
        <class>com.altametrics.persistence.services.Address</class>
         <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <properties>          

            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/sample"/>
            <property name="javax.persistence.jdbc.password" value="admin"/>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.user" value="root"/> 
            <property name="eclipselink.weaving" value="static"/>         
            <!--  <property name="eclipselink.ddl-generation" value="drop-and-create-tables" /> -->
          <property name="eclipselink.logging.level" value="FINEST"/> 

        </properties>
    </persistence-unit>

Have you setup weaving? EclipseLink lazy on ManyToOne and OneToone requires the use of byte code weaving wiki.eclipse.org/EclipseLink/UserGuide/JPA/… If you are accessing the person, how are you determining that it wasn't lazily loaded - the act of accessing the relationship will cause it to be fetched. — Chris
@Chris thanks! If person has other relationships like with department or city it logs the query for person as well as find city and department also — Achyut
Check out the link for dynamic weaving and weaving in Java EE servers. If this isn't in a Java EE server, you will have to setup dynamic weaving with an agent, or use static weaving options. — Chris
@Chris but it works for one to many fetching. Is Iam doing something wrong ? — Achyut
Yes it should always work for collection type mappings as they do not require weaving - a proxy collection can be used. Weaving is used for lazy 1:1, M:1, fetch groups, change tracking and other performance enhancements. — Chris

Chris Chris · Accepted Answer · 2013-09-12T14:05:30

weaving is required for some lazy relationships and enabling other performance enhancements in EclipseLink such as fetch groups and change tracking, as described at http://www.eclipse.org/eclipselink/documentation/2.4/concepts/app_dev007.htm

Weaving is generally automatic occurs within EE 7 containers, but will require work outside of the container or in non-EE7 containers. So to get lazy to work on 1:1 and M:1, you will need to enable weaving either dynamically through use of an agent, or statically weaving class files and then using those.

Lazy loading does not works for ManyToOne in eclipselink

1 Answers