EclipseLink, JPA, generic entity + SINGLE_TABLE legacy

I was wondering if it is possible in JPA to define a generic entity as in my case PropertyBase < T > and derive concrete entity like ShortProperty and string classes and use with legacy SINGLE_TABLE mode? If I try to instances of ElementModel commit newly created (see ElementModelTest) on the EntityManager I always get a NumberFormatException this 'value' cannot be successfully converted to a short. Curiously, if I define all the classes below as my test case class 'ElementModelTest' static inner classes, it seems to work. Any ideas that I need to change to make it work?

I use EclipseLink eclipselink - 2.6.0.v20131019 - ef98e5d.

public abstract class PersistableObject
    implements Serializable {

    private static final long serialVersionUID = 1L;

    private String id = UUID.randomUUID().toString();

    private Long version;

    public PersistableObject() {
           this(serialVersionUID);
    }

    public PersistableObject(final Long paramVersion) {
          version = paramVersion;
    }

    public String getId() {
 return id;
    }

    public void setId(final String paramId) {
  id = paramId;
    }

    public Long getVersion() {
 return version;
    }
    public void setVersion(final Long paramVersion) {
  version = paramVersion;
    }

    public String toString() {
  return this.getClass().getName() + "[id=" + id + "]";
    }

}


public abstract class PropertyBase<T> extends PersistableObject {

    private static final long serialVersionUID = 1L;

    private String name;
    private T value;

    public PropertyBase() {
 this(serialVersionUID);
    }

    public PropertyBase(final Long paramVersion) {
  this(paramVersion, null);
    }

    public PropertyBase(final Long paramVersion, final String paramName) {
  this(paramVersion, paramName, null);
    }

    public PropertyBase(final Long paramVersion, final String paramName, final T paramValue) {
  super(paramVersion);
  name = paramName;
  value = paramValue;
    }

    public String getName() {
 return name;
    }

    public void setName(final String paramName) {
  name = paramName;
    }

    public T getValue() {
 return value;
    }

    public void setValue(final T paramValue) {
  value = paramValue;
    }

}


public class ShortProperty extends PropertyBase<Short> {

    private static final long serialVersionUID = 1L;

    public ShortProperty() {
 this(null, null);
    }

    public ShortProperty(final String paramName) {
  this(paramName, null);
    }

    public ShortProperty(final String paramName, final Short paramValue) {
  super(serialVersionUID, paramName, paramValue);
    }

}


public class StringProperty extends PropertyBase<String> {

    private static final long serialVersionUID = 1L;

    protected StringProperty() {
 this(null, null);
    }

    public StringProperty(final String paramName) {
  this(paramName, null);
    }

    public StringProperty(final String paramName, final String paramValue) {
  super(serialVersionUID, paramName, paramValue);
    }

}

public class ElementModel extends PersistableObject {

    private static final long serialVersionUID = 1L;

    private StringProperty name = new StringProperty("name");
    private ShortProperty number = new ShortProperty("number");

    public ElementModel() {
 this(serialVersionUID);
    }

    public ElementModel(final Long paramVersion) {
  super(paramVersion);
    }

    public String getName() {
  return name.getValue();
    }

    public void setName(final String paramName) {
  name.setValue(paramName);
    }

    public Short getNumber() {
  return number.getValue();
    }

    public void setNumber(final Short paramNumber) {
  number.setValue(paramNumber);
    }


}


<?xml version="1.0" encoding="UTF-8" ?>
<entity-mappings version="2.1"
 xmlns="http://xmlns.jcp.org/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence/orm http://xmlns.jcp.org/xml/ns/persistence/orm_2_1.xsd">

 <mapped-superclass
  class="PersistableObject">
  <attributes>
  <id name="id">
  <column name="id" />
  </id>
  <version name="version" access="PROPERTY">
  <column name="version" />
  </version>
  </attributes>
 </mapped-superclass>

 <entity class="PropertyBase">
  <table name="PropertyBase" />
  <inheritance />
  <discriminator-column name="type"/>
  <attributes>
  <basic name="name">
  <column name="name" />
  </basic>
  <basic name="value">
  <column name="value" />
  </basic>
  </attributes>
 </entity>

 <entity class="StringProperty">
  <discriminator-value>StringProperty</discriminator-value>
 </entity>

 <entity class="ShortProperty">
  <discriminator-value>ShortProperty</discriminator-value>
 </entity>

 <entity class="ElementModel">
  <table name="ElementModel" />
  <inheritance />
  <discriminator-column name="type"/>
  <attributes>
  <one-to-one name="name">
  <join-column name="name" referenced-column-name="id" />
  <cascade>
  <cascade-all />
  </cascade>
  </one-to-one>
  <one-to-one name="number">
  <join-column name="number" referenced-column-name="id" />
  <cascade>
  <cascade-all />
  </cascade>
  </one-to-one>
  </attributes>
 </entity>
</entity-mappings>



public class ElementModelTest extends ModelTest<ElementModel> {

    public ElementModelTest() {
  super(ElementModel.class);
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testSQLPersistence() {

  final String PERSISTENCE_UNIT_NAME = getClass().getPackage().getName();
  new File("res/db/test/" + PERSISTENCE_UNIT_NAME + ".sqlite").delete();

  EntityManagerFactory factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
  EntityManager em = factory.createEntityManager();

  Query q = em.createQuery("select m from ElementModel m");
  List<ElementModel> modelList = q.getResultList();
  int originalSize = modelList.size();

  for (ElementModel model : modelList) {
      System.out.println("name: " + model.getName());
  }

  System.out.println("size before insert: " + modelList.size());

  em.getTransaction().begin();

  for (int i = 0; i < 10; ++i) {
      ElementModel device = new ElementModel();
      device.setName("ElementModel: " + i);
    device.setNumber((short) i);
      em.persist(device);
  }

  em.getTransaction().commit();

  modelList = q.getResultList();
  System.out.println("size after insert: " + modelList.size());

  assertTrue(modelList.size() == (originalSize + 10));

  em.close();

    }

}


He replied by a cross post here java - EclipseLink, JPA, generic entity + SINGLE_TABLE legacy - Stack Overflow

Short answer: no, it should not run because the underlying database field type would be constant.  If the chain or the short would have conversion problems in the type of database, they both put in correspondence in the same field in table.

Tags: Fusion Middleware

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    CacheEntry[file:/C:/Desenv/Projetos/workspace_beta02/Tedros-Box/dist/lib/javaee-api-6.0-5.jar]: updateAvailable = false, lastModified = Thu Dec 12 20:23:20 BRST 2013, length = 989597

    CacheEntry[file:/C:/Desenv/Projetos/workspace_beta02/Tedros-Box/dist/lib/org.eclipse.persistence.jpars.source_2.4.1.v20121003-ad44345.jar]: updateAvailable = false, lastModified = Thu Dec 12 20:23:23 BRST 2013, length = 65144

    CacheEntry[file:/C:/Desenv/Projetos/workspace_beta02/Tedros-Box/dist/lib/spring-beans-3.0.7.RELEASE.jar]: updateAvailable = false, lastModified = Thu Dec 12 20:23:23 BRST 2013, length = 563508

    CacheEntry[file:/C:/Desenv/Projetos/workspace_beta02/Tedros-Box/dist/lib/org.eclipse.persistence.jpars_2.4.1.v20121003-ad44345.jar]: updateAvailable = false, lastModified = Thu Dec 12 20:23:23 BRST 2013, length = 93694

    CacheEntry[file:/C:/Desenv/Projetos/workspace_beta02/Tedros-Box/dist/lib/eclipselink.jar]: updateAvailable = false, lastModified = Thu Dec 12 20:23:19 BRST 2013, length = 8449501

    ***************

    JNLP

    ***************

    <? XML version = "1.0" encoding = "utf-8"? >

    " < jnlp spec ="1.0"xmlns:jfx =" http://JavaFX.com "href =" Tedros - Box.jnlp "> "

    < information >

    < title > Tedros-Box < /title >

    < vendor name > Gordon Davis < / seller >

    value null < description > < / description >

    < offline permitted / >

    < / information >

    < resources >

    " < jfx:javafx - runtime version ="2.2 +"href =" http://javadl.Sun.com/webapps/download/GetFile/JavaFX-latest/Windows-i586/javafx2.JNLP "/ > "

    < / resource >

    < resources >

    " < j2se version = '1.6 +' href = ' http://Java.Sun.com/products/AutoDL/J2SE "/>

    < jar href = "Tedros - Box.jar" size = '200921' download 'impatient' = / >

    < jar href = "lib/App-message - Controle.jar" size = "141981" download = "eager" / >

    < jar href = ' lib/Tedros-App - API.jar' size = '116706' download 'impatient' = / >

    < jar href = "lib/Tedros-Core - EjbClient.jar" size = '5185' download 'impatient' = / >

    < jar href = ' lib/Tedros-Core - Model .jar' size = '47516' download 'impatient' = / >

    < jar href = ' lib/Tedros-Core' size = '108000' download 'impatient' = / >

    < jar href = ' lib/Tedros-DataAccess-model - API.jar' size = '13588' download 'impatient' = / >

    < jar href = ' lib/Tedros-DataAccess-Server - API.jar' size = '32124' download 'impatient' = / >

    < jar href = "lib/Tedros - Exception.jar" size = "2624" download = "forward" / >

    < jar href = "lib/Tedros - FXComponents.jar" size = "282972" download = "eager" / >

    < jar href = ' lib/Tedros - Util.jar' size = '15348' download 'impatient' = / >

    "< jar href="lib/commons-collections-3.2.1.jar ' size = download "583672" = "forward" / >

    "< jar href="lib/commons-lang3-3.1.jar ' size = tΘlΘchargement "319222" = "forward" / >

    "< jar href="lib/eclipselink-jpa-modelgen_2.4.1.v20121003-ad44345.jar ' size = tΘlΘchargement "12387" = "forward" / >

    < jar href = "lib/eclipselink.jar' size = download"8449501"="forward"/ >"

    "< jar href="lib/javaee-api-6.0-5.jar ' size = download "989597" = "forward" / >

    "< jar href="lib/javax.persistence_2.0.4.v201112161009.jar ' size = download "128747" = "forward" / >

    < jar href = "lib/jfxrt.jar' size = download"15117378"="forward"/ >"

    "< jar href="lib/openejb-client-4.5.2.jar ' size = download "318492" = "forward" / >

    "< jar href="lib/org.eclipse.persistence.jpars.source_2.4.1.v20121003-ad44345.jar ' size = tΘlΘchargement "65144" = "forward" / >

    "< jar href="lib/org.eclipse.persistence.jpars_2.4.1.v20121003-ad44345.jar ' size = tΘlΘchargement "93694" = "forward" / >

    "< jar href="lib/spring-beans-3.0.7.RELEASE.jar ' size = download "563508" = "forward" / >

    < / resource >

    < security >

    < all-permissions / >

    < / security >

    < width applet-desc = "1280" height = "760" hand-class = "com.javafx.main.NoJavaFXFallback" name = "Tedros-Box" >

    < param name = "requiredFXVersion" value = "2.2 +" / >

    < / applet-desc >

    < jfx:javafx - width desc = "1280" height = "760" hand-class = "com.tedros.Tedros" name = "Tedros-Box" / >

    < audit update 'always' = policy = "always" / >

    < / jnlp >

    I could be wrong, but I don't think that these are not errors. They just say you whence your jar files. In your case, they just cached entries. You probably want to clear your cache. I do this by running javaws - uninstall and then javaws - clearcache

  • Best practices for JTables.

    Hello



    I'm programming in Java since 5 months ago. Now I am developing an application that uses charts to present information to a database. This is my first time manipulation of tables in Java. I read the tutorial Swing of the Sun on JTable and more information on other sites, but they are limited to the syntax of the table and not in best practices.



    So I decided what I think is a good way to manage data in a table, but I don't know which is the best way. Let me tell you the General steps that I'm going through:



    (1) I query the data from the employee of Java DB (with EclipseLink JPA) and load it into an ArrayList.

    (2) I use this list to create the JTable, prior transformation to an Object [] [] and it fuels a custom TableModel.

    (3) thereafter, if I need to get something on the table, I search on the list and then with the index resulting from it, I get it from the table. This is possible because I keep the same order of the rows on the table and on the list.

    (4) if I need to put something on the table, I do also on my list, and so on if I need to remove or edit an item.



    Is the technique that I use a best practice? I'm not sure that duty always synchronized table with the list is the best way to handle this, but I don't know how I would deal with comes with the table, for example to effectively find an item or to sort the array, without first on a list.



    Are there best practices in dealing with tables?



    Thank you!

    Francisco.

    You should never list directly update, wait for when you first create the list and add it to the TableModel. All future updates must be performed on the TableModel directly.

    See the [http://www.camick.com/java/blog.html?name=row-table-model url] Table of line by a model example of this approach. Also, follow the link BeanTableModel for a more complete example.

  • OpenJPA plugin for Eclipse?

    Hi all

    Is there a plugin for Eclipse OpenJPA? I so, what is its role, and it is available for Eclipse 3.2.2 version?

    Thank you.

    Hello
    Here are some links to information.
    To get more simple examples not related to a specific EE application server - you can see the examples of the JPA and Eclipse JPA SE project that performs a simple query and insert after completing the automatic DDL generation.
    http://dev.Eclipse.org/svnroot/RT/org.Eclipse.persistence/trunk/examples/org.Eclipse.persistence.example.JPA.Server.common.ddlgen/

    EclipseLink is the reference implementation of JPA 2.0 (RI) for JSR-317 (part of the EJB 3.1), announced the 20080317 and the SUN GlassFish Application Server V3.
    http://www.Eclipse.org/org/press-release/20080317_Eclipselink.php
    http://blogs.Sun.com/theaquarium/entry/eclipselink_in_glassfish_v3_as
    EclipseLink is the reference for the Dali JPA Tools of Eclipse.org project persistence provider
    http://wiki.Eclipse.org/Dali
    Oracle Enterprise Pack for Eclipse 11g supports Oracle TopLink with EclipseLink JPA provider.
    http://blogs.Oracle.com/devtools/2009/03/oracle_enterprise_pack_for_ecl_1.html
    EclipseLink (TopLink donate) open source for 2 years and had 2 major versions 1.0 and 1.1, and is almost version 2.0 - the provider in TopLink JPA is EclipseLink.
    http://www.Oracle.com/corporate/press/2007_mar/opensource-TopLink.html
    EclipseLink provides extensions to the JPA 1.0 and 2.0 API standard such as performance optimization.
    http://wiki.Eclipse.org/EclipseLink/performance
    EclipseLink contains RI ODS 2.1.1 JSR - 235 (provide seamless integration SCA)
    http://JCP.org/en/JSR/detail?ID=235
    EclipseLink was supported by the Spring framework since 2.5.2 in March 2008 (1.0M4)
    http://www.SpringSource.org/node/601

    OpenJPA/Kodo links:
    http://eDOCS.BEA.com/WLS/docs103/Kodo.html
    http://eDOCS.BEA.com/WLS/docs103/Kodo/OpenJPA-Javadoc/index.html
    http://eDOCS.BEA.com/WLS/docs103/Kodo/full/HTML/samples_guide_part.html
    http://eDOCS.BEA.com/WLS/docs103/Kodo/full/HTML/tutorials.html

    Thank you
    /Michael

    Published by: michael_obrien on April 7, 2009 09:57

  • With the help of Toplink with Eclipse - (Newbie question)

    If you have (for example):

    * a white Dynacmic Web project in Eclipse
    * and you have a Toplink Workbench project - say a project XML or database.

    You will need to save your project Toplink, spurting on different directories for example classes, descriptors, schemas, fooname.mwp etc.

    Where do you want to save it in your Java project - what is in /src? Or somewhere else?

    I ask this question because I have problems when you debug my application - some xml files cannot be found etc. In any case, I guess I just need to know if I get the right bases for now - so any help will be highly appreciated.

    PS - Why can I not find a simple tutorial/example showing Eclipse and Toplink - it's all the builds JDeveloper and Ant and ahhhhhghghhhgh!

    golcarlad,
    Hi, try the following examples EclipseLink JPA and tutorials for environments SE and EE - oriented around the Eclipse 3.4 IDE (Ant capable but WTP ready)
    With these, you will be able to fully debug your JPA application on and off any server application.

    If you deploy your WAR for Tomcat, then the tutorial following the performance of EclipseLink JPA on Tomcat 6 always will help you. Put your file additional alongside persistence.xml orm.xml if you use features beyond the standard JPA.

    http://wiki.Eclipse.org/EclipseLink/examples/JPA/Tomcat_Web_Tutorial

    Of
    Help on creating a ServerSession in Eclipse with XML file

    "In the note in particular that there are two META-INF directories - we use only off the coast of the CBC."
    «Make sure that your persistence.xml (and optionally orm.xml) file is placed outside of the src/META-INF directory and not the dir of WebContent/META-INF by default so that it gets picked up by the servlet from the Directory class loader classes.»

    Other tutorials:
    http://wiki.Eclipse.org/EclipseLink/examples
    http://wiki.Eclipse.org/EclipseLink/examples/JPA
    http://wiki.Eclipse.org/EclipseLink/examples/JPA/EmployeeXML
    http://wiki.Eclipse.org/EclipseLink/examples/JPA/dynamic
    http://wiki.Eclipse.org/EclipseLink/examples/JPA#JPA_Web_Application_Tutorials
    http://wiki.Eclipse.org/EclipseLink/examples/JPA/WebLogic_Web_Tutorial
    http://wiki.Eclipse.org/EclipseLink/examples/JPA/OC4J_Web_Tutorial
    http://wiki.Eclipse.org/EclipseLink/examples/JPA/JBoss_Web_Tutorial

    Thank you
    /Michael

    Published by: michael_obrien on March 19, 2009 09:19

  • JNDI can acquire and not datasource.   -WLS JDBC, 10.3

    Now I have problems connecting to the database for my EJB entities.

    I use Jdev 11 r1, ADF Faces, EJB3.0, Oracle database 10g. I have my WLS connection to the database server, and the application connects to it, when it is run with the server integrated into Jdeveloper. When I deploy my application for the server (I created a JDBC connection to the database with the name jndi jdbc/DatabaseDevDS), I get way below.

    I have my persistence.xml

    < name of persistence - unit = "Company" >
    <>provider
    org.eclipse.persistence.jpa.PersistenceProvider
    < / provider >
    < jta-data-source >
    Java: / app/jdbc/jdbc/DatabaseDevDS
    < / jta-data-source >

    ERROR:

    Caused by: Exception EclipseLink-7060 (Eclipse - 1.0.1 persistence Services (Build 20080905)): org.eclipse.persistence
    .exceptions. ValidationException
    Description of the exception: could not acquire data source Java: / app/jdbc/jdbc/DatabaseDevDS.
    Inner exception: javax.naming.NameNotFoundException: while trying to search/app/jdbc/jdbc/DatabaseDevDS/app/ejb/E
    JB.jar #SessionEJB. ; rest the name "/ app/jdbc/jdbc/DatabaseDevDS.
    at org.eclipse.persistence.exceptions.ValidationException.cannotAcquireDataSource(ValidationException.java:429)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:123)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:94)
    at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:164)
    at org.eclipse.persistence.internal.databaseaccess.DatasourceAccessor.connectInternal (DatasourceAccessor.java:32
    4)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.connectInternal(DatabaseAccessor.java:264)
    at org.eclipse.persistence.internal.databaseaccess.DatasourceAccessor.connect(DatasourceAccessor.java:407)
    at org.eclipse.persistence.sessions.server.ConnectionPool.buildConnection(ConnectionPool.java:130)
    at org.eclipse.persistence.sessions.server.ExternalConnectionPool.startUp(ExternalConnectionPool.java:110)
    at org.eclipse.persistence.sessions.server.ServerSession.connect(ServerSession.java:500)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.login(DatabaseSessionImpl.java:606)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login (EntityManagerFactoryProvider.java:211
    )
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:246)
    ... more than 97
    Caused by: javax.naming.NameNotFoundException: while trying to get/app/jdbc/jdbc/DatabaseDevDS in /app/ejb/EJB.jar#Se
    ssionEJB. ; rest the name "/ app/jdbc/jdbc/DatabaseDevDS.
    at weblogic.jndi.internal.BasicNamingNode.newNameNotFoundException(BasicNamingNode.java:1139)
    at weblogic.jndi.internal.ApplicationNamingNode.lookup(ApplicationNamingNode.java:144)
    at weblogic.jndi.internal.WLEventContextImpl.lookup(WLEventContextImpl.java:254)
    at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:380)
    at weblogic.jndi.factories.java.ReadOnlyContextWrapper.lookup(ReadOnlyContextWrapper.java:45)
    at weblogic.jndi.internal.AbstractURLContext.lookup(AbstractURLContext.java:135)
    at javax.naming.InitialContext.lookup(InitialContext.java:396)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:117)
    ... more than 108

    Dan,
    Hi, thank your for use EclipseLink as EJB 3.0 JPA provider.
    The appearance of your JNDI name (* java: / app/jdbc/jdbc/DatabaseDevDS *)-(Note: il y a un double «* jdbc *») as opposed to a global brand (* DatabaseDevDS *) in your persistence.xml JPA - it seems that you are using a broad application data source and not a source of data globally extensive set directly on your WebLogic Server.

    If this is the case, for a broad application datasource on Oracle WebLogic server please see the tutorial following the 3 steps to prepare your application to use app level datasources.
    The application following business base tutorial using EclipseLink as the APP provider described workaround to use a source of data application when it is deployed on WebLogic 10.3 using the normal + the < jta-data-source > + element and the overriding javax.persistence.jtaDataSource property, until the bug of WLS Server base followed by EclipseLink bug # 246126 in. [http://bugs.eclipse.org/246126] is fixed soon.
    Reference
    [http://wiki.eclipse.org/EclipseLink/Examples/JPA/WLS_AppScoped_DataSource]
    related to
    [http://wiki.eclipse.org/EclipseLink/Examples/JPA/WebLogic_Web_Tutorial#Application_Scoped_Datasource_Setup]

    Persistence.XML suggested additional changes:
    (1) adds a reference to the WebLogic Platform
    + < property name = value "eclipselink.target - server" = "WebLogic_10" / >.

    (2) make sure you really set your datasource scope application (tutorial 3 steps above) with a double ' * jdbc. "
    * "" java: / app/jdbc/jdbc/DatabaseDevDS "*"
    and didn't really say "+ java: / app/jdbc/DatabaseDevDS +" which is usually standard

    See
    [http://wiki.eclipse.org/EclipseLink/Examples/JPA/WebLogic_Web_Tutorial#Persistence.xml]
    and an EclipseLink open source example that uses a globally set the datasource in an application tutorial WebLogic Web using EclipseLink JPA provider
    [http://dev.eclipse.org/svnroot/rt/org.eclipse.persistence/trunk/examples/org.eclipse.persistence.example.jpa.server.weblogic.enterpriseEJB/ejbModule/META-INF/persistence.xml]

    In addition, an additional workaround would be globally set the source of data on your integrated WebLogic Server and reference as described in...
    [http://wiki.eclipse.org/EclipseLink/Examples/JPA/WebLogic_Web_Tutorial#Global_Scoped_Datasource_Setup]

    I hope this helps.
    For any other TopLink, EclipseLink questions you can also post on the next TopLink forum or EclipseLink related forums

    TopLink/Eclipselink
    [f [48]
    EclipseLink
    [https://dev.eclipse.org/mailman/listinfo/eclipselink-users]
    [http://www.eclipse.org/newsportal/thread.php?group=eclipse.rt.eclipselink]
    [http://www.nabble.com/EclipseLink-f26430.html]

    Shay, thanks for pointing the tutorial to EclipseLink.

    Thank you
    /Michael att eclipselink.org

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