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Date: 28 Sep 2004 14:13:50 -0000
Message-ID: <20040928141350.82385.qmail@minotaur.apache.org>
From: arminw@apache.org
To: db-ojb-cvs@apache.org
Subject: cvs commit: db-ojb/src/test/org/apache/ojb
 repository_junit_reference.xml
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arminw      2004/09/28 07:13:50

  Modified:    src/schema Tag: OJB_1_0_RELEASE ojbtest-schema.xml
               src/test/org/apache/ojb/broker Tag: OJB_1_0_RELEASE
                        MultithreadedReadTest.java
               src/test/org/apache/ojb Tag: OJB_1_0_RELEASE
                        repository_junit_reference.xml
  Log:
  modify test to show problem with object materialization
  in multthreaded environments under heavy load
  
  Revision  Changes    Path
  No                   revision
  No                   revision
  1.80.2.2  +15 -1     db-ojb/src/schema/ojbtest-schema.xml
  
  Index: ojbtest-schema.xml
  ===================================================================
  RCS file: /home/cvs/db-ojb/src/schema/ojbtest-schema.xml,v
  retrieving revision 1.80.2.1
  retrieving revision 1.80.2.2
  diff -u -r1.80.2.1 -r1.80.2.2
  --- ojbtest-schema.xml	27 Jul 2004 00:31:50 -0000	1.80.2.1
  +++ ojbtest-schema.xml	28 Sep 2004 14:13:49 -0000	1.80.2.2
  @@ -857,6 +857,20 @@
           <column name="FK_REF" type="INTEGER"/>
       </table>
   
  +    <table name="READTEST_INVOICE">
  +        <column name="OJB_ID" required="true" primaryKey="true" type="INTEGER"/>
  +        <column name="NAME" type="VARCHAR" size="150"/>
  +        <column name="INVOICE_NUMBER" type="VARCHAR" size="150"/>
  +        <column name="FK_REF" type="INTEGER"/>
  +    </table>
  +
  +    <table name="READTEST_ARTICLE">
  +        <column name="OJB_ID" required="true" primaryKey="true" type="INTEGER"/>
  +        <column name="NAME" type="VARCHAR" size="150"/>
  +        <column name="DESCRIPTION" type="VARCHAR" size="150"/>
  +        <column name="FK_REF" type="INTEGER"/>
  +    </table>
  +
       <table name="READTEST_ADDRESS">
           <column name="OJB_ID" required="true" primaryKey="true" type="INTEGER"/>
           <column name="NAME" type="VARCHAR" size="150"/>
  
  
  
  No                   revision
  No                   revision
  1.3.2.1   +265 -51   db-ojb/src/test/org/apache/ojb/broker/MultithreadedReadTest.java
  
  Index: MultithreadedReadTest.java
  ===================================================================
  RCS file: /home/cvs/db-ojb/src/test/org/apache/ojb/broker/MultithreadedReadTest.java,v
  retrieving revision 1.3
  retrieving revision 1.3.2.1
  diff -u -r1.3 -r1.3.2.1
  --- MultithreadedReadTest.java	5 Apr 2004 17:11:48 -0000	1.3
  +++ MultithreadedReadTest.java	28 Sep 2004 14:13:49 -0000	1.3.2.1
  @@ -6,6 +6,8 @@
   import java.util.Iterator;
   import java.util.List;
   
  +import org.apache.ojb.broker.metadata.ClassDescriptor;
  +import org.apache.ojb.broker.metadata.ObjectReferenceDescriptor;
   import org.apache.ojb.broker.query.Criteria;
   import org.apache.ojb.broker.query.QueryByCriteria;
   import org.apache.ojb.junit.JUnitExtensions;
  @@ -19,7 +21,11 @@
    */
   public class MultithreadedReadTest extends JUnitExtensions.MultiThreadedTestCase
   {
  -    int loops = 2;
  +    static final int NONE = ObjectReferenceDescriptor.CASCADE_NONE;
  +    static final int LINK = ObjectReferenceDescriptor.CASCADE_LINK;
  +    static final int OBJECT = ObjectReferenceDescriptor.CASCADE_OBJECT;
  +
  +    int loops = 1;
       int concurrentThreads = 19;
       int numberOfObjects = 30;
   
  @@ -41,19 +47,39 @@
   
       protected void tearDown() throws Exception
       {
  +        PersistenceBroker broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  +        try
  +        {
  +            changeReferenceSetting(broker, AccountImpl.class, "buyer", true, NONE, NONE, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "address", true, NONE, NONE, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "invoices", true, NONE, NONE, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "articles", true, NONE, NONE, false);
  +        }
  +        finally
  +        {
  +            if(broker != null)
  +            {
  +                broker.close();
  +            }
  +        }
           super.tearDown();
       }
   
       public void testClosedPB() throws Throwable
       {
           String name = "testClosedPB_"+System.currentTimeMillis();
  -
  -        Integer[] ids = prepareTestRead(name, 5);
           Account account = null;
           PersistenceBroker broker = null;
           try
           {
               broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  +            changeReferenceSetting(broker, AccountImpl.class, "buyer", true, OBJECT, OBJECT, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "address", true, OBJECT, OBJECT, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "invoices", true, OBJECT, OBJECT, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "articles", true, OBJECT, OBJECT, false);
  +            Integer[] ids = prepareTestRead(broker, name, 5);
  +            broker.clearCache();
  +
               Criteria crit = new Criteria();
               crit.addIn("id", Arrays.asList(ids));
               QueryByCriteria query = new QueryByCriteria(Account.class, crit);
  @@ -89,13 +115,18 @@
           for (int k = 0; k < loops; k++)
           {
               String searchCriteria = "testObjectMaterializationByDifferentThread_" + System.currentTimeMillis();
  -            prepareTestRead(searchCriteria, concurrentThreads);
  -
  -            Collection accounts;
               PersistenceBroker broker = null;
  +            Collection accounts;
               try
               {
                   broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  +                changeReferenceSetting(broker, AccountImpl.class, "buyer", true, OBJECT, OBJECT, false);
  +                changeReferenceSetting(broker, BuyerImpl.class, "address", true, OBJECT, OBJECT, true);
  +                changeReferenceSetting(broker, BuyerImpl.class, "invoices", true, OBJECT, OBJECT, true);
  +                changeReferenceSetting(broker, BuyerImpl.class, "articles", true, OBJECT, OBJECT, false);
  +                prepareTestRead(broker, searchCriteria, concurrentThreads);
  +                broker.clearCache();
  +
                   Criteria crit = new Criteria();
                   crit.addEqualTo("name", searchCriteria);
                   QueryByCriteria query = new QueryByCriteria(Account.class, crit);
  @@ -123,15 +154,32 @@
       public void testMultithreadedRead() throws Exception
       {
           String searchCriteria = "testMultithreadedRead_" + System.currentTimeMillis();
  -        prepareTestRead(searchCriteria, numberOfObjects);
  +        PersistenceBroker broker = null;
  +        try
  +        {
  +            broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  +            changeReferenceSetting(broker, AccountImpl.class, "buyer", true, OBJECT, OBJECT, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "address", true, OBJECT, OBJECT, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "invoices", true, OBJECT, OBJECT, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "articles", true, OBJECT, OBJECT, false);
  +            prepareTestRead(broker, searchCriteria, numberOfObjects);
  +            broker.clearCache();
  +        }
  +        finally
  +        {
  +            if(broker != null) broker.close();
  +        }
  +
  +        System.out.println();
           System.out.println("Multithreaded read of objects - start");
           System.out.println("" + concurrentThreads + " concurrent threads read "
                   + numberOfObjects + " objects per thread, loop " + loops + " times");
           for (int k = 0; k < loops; k++)
           {
  -            PersistenceBroker broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  +            broker = PersistenceBrokerFactory.defaultPersistenceBroker();
               broker.clearCache();
               broker.close();
  +
               TestCaseRunnable tct [] = new TestCaseRunnable[concurrentThreads];
               for (int i = 0; i < concurrentThreads; i++)
               {
  @@ -140,7 +188,7 @@
               // run test classes
               runTestCaseRunnables(tct);
           }
  -        System.out.println();
  +
           System.out.println("Multithreaded read of objects - end");
       }
   
  @@ -150,15 +198,33 @@
       public void testMultithreadedLazyRead() throws Exception
       {
           String name = "testMultithreadedLazyRead" + System.currentTimeMillis();
  -        List identityList = prepareTestLazyRead(name, concurrentThreads);
  +        PersistenceBroker broker = null;
  +        List identityList = null;
  +        try
  +        {
  +            broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  +            changeReferenceSetting(broker, AccountImpl.class, "buyer", true, OBJECT, OBJECT, false);
  +            changeReferenceSetting(broker, BuyerImpl.class, "address", true, OBJECT, OBJECT, true);
  +            changeReferenceSetting(broker, BuyerImpl.class, "invoices", true, OBJECT, OBJECT, true);
  +            changeReferenceSetting(broker, BuyerImpl.class, "articles", true, OBJECT, OBJECT, true);
  +            identityList = prepareTestLazyRead(broker, name, concurrentThreads);
  +            broker.clearCache();
  +        }
  +        finally
  +        {
  +            if(broker != null) broker.close();
  +        }
  +
  +        System.out.println();
           System.out.println("Multithreaded lazy read of objects - start");
           System.out.println("" + concurrentThreads + " concurrent threads read different object with lazy" +
                   " materialization reference, loop " + loops + " times");
           for (int k = 0; k < loops; k++)
           {
  -            PersistenceBroker broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  +            broker = PersistenceBrokerFactory.defaultPersistenceBroker();
               broker.clearCache();
               broker.close();
  +
               TestCaseRunnable tct [] = new TestCaseRunnable[concurrentThreads];
               for (int i = 0; i < concurrentThreads; i++)
               {
  @@ -167,63 +233,85 @@
               // run test classes
               runTestCaseRunnables(tct);
           }
  -        System.out.println();
           System.out.println("Multithreaded lazy read of objects - end");
       }
   
  -    private Integer[] prepareTestRead(String name, int numbers) throws Exception
  +    private Integer[] prepareTestRead(PersistenceBroker broker, String name, int numbers) throws Exception
       {
           Integer[] ids = new Integer[numbers];
  -        PersistenceBroker broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  -        try
  +        for (int i = 0; i < numbers; i++)
           {
  -            broker.beginTransaction();
  -            for (int i = 0; i < numbers; i++)
  -            {
  -                AddressType type = new AddressTypeImpl(name);
  -                Address address = new AddressImpl(name, type);
  -                Buyer buyer = new BuyerImpl(name, address);
  -                Account account = new AccountImpl(name, buyer);
  -                broker.store(account);
  -                ids[i] = account.getId();
  -            }
  -            broker.commitTransaction();
  -            broker.clearCache();
  +            AddressType type = new AddressTypeImpl(name);
  +            Address address = new AddressImpl(name, type);
  +            Buyer buyer = new BuyerImpl(name, address);
  +            buyer.setArticles(buildArticles(name, numbers));
  +            buyer.setInvoices(buildInvoices(name, numbers));
  +            Account account = new AccountImpl(name, buyer);
  +            broker.store(account);
  +            ids[i] = account.getId();
           }
  -        finally
  +        return ids;
  +    }
  +
  +    private List prepareTestLazyRead(PersistenceBroker broker, String searchCriteria, int numbers) throws Exception
  +    {
  +        List result = new ArrayList();
  +        for (int i = 0; i < numbers; i++)
           {
  -            if (broker != null) broker.close();
  +            AddressType type = new AddressTypeImpl(searchCriteria);
  +            Address address = new AddressImpl(searchCriteria, type);
  +            Buyer buyer = new BuyerImpl(searchCriteria, address);
  +            buyer.setArticles(buildArticles(searchCriteria, numbers));
  +            buyer.setInvoices(buildInvoices(searchCriteria, numbers));
  +            Account account = new AccountImpl(searchCriteria, buyer);
  +            broker.store(account);
  +            Identity oid = broker.serviceIdentity().buildIdentity(account);
  +            result.add(oid);
           }
  -        return ids;
  +        return result;
       }
   
  -    private List prepareTestLazyRead(String searchCriteria, int numbers) throws Exception
  +    private List buildInvoices(String name, int numbers)
       {
           List result = new ArrayList();
  -        PersistenceBroker broker = PersistenceBrokerFactory.defaultPersistenceBroker();
  -        try
  +        for(int i = 0; i < numbers; i++)
           {
  -            broker.beginTransaction();
  -            for (int i = 0; i < numbers; i++)
  -            {
  -                AddressType type = new AddressTypeImpl(searchCriteria);
  -                Address address = new AddressImpl(searchCriteria, type);
  -                Buyer buyer = new BuyerImpl(searchCriteria, address);
  -                Account account = new AccountImpl(searchCriteria, buyer);
  -                broker.store(account);
  -                Identity oid = new Identity(account, broker);
  -                result.add(oid);
  -            }
  -            broker.commitTransaction();
  -            broker.clearCache();
  +            String invoiceNumber = "I_" + (long)(Math.random() * Long.MAX_VALUE);
  +            Invoice invoice = new InvoiceImpl(name, invoiceNumber);
  +            result.add(invoice);
           }
  -        finally
  +        return result;
  +    }
  +
  +    private List buildArticles(String name, int numbers)
  +    {
  +        List result = new ArrayList();
  +        for(int i = 0; i < numbers; i++)
           {
  -            if (broker != null) broker.close();
  +            Article a = new ArticleImpl(name, "a article description");
  +            result.add(a);
           }
           return result;
       }
   
  +    void changeReferenceSetting(PersistenceBroker broker, Class clazz, String fieldName, boolean autoRetrieve, int autoUpdate, int autoDelete, boolean proxy)
  +    {
  +        ClassDescriptor cld = broker.getClassDescriptor(clazz);
  +        ObjectReferenceDescriptor descriptor = cld.getCollectionDescriptorByName(fieldName);
  +        if(descriptor == null)
  +        {
  +            descriptor = cld.getObjectReferenceDescriptorByName(fieldName);
  +        }
  +        if(descriptor == null)
  +        {
  +            throw new RuntimeException("Field name " + fieldName + " does not represent a reference in class '" + clazz.getName() + "'");
  +        }
  +        descriptor.setLazy(proxy);
  +        descriptor.setCascadeRetrieve(autoRetrieve);
  +        descriptor.setCascadingStore(autoUpdate);
  +        descriptor.setCascadingDelete(autoDelete);
  +    }
  +
   
       //***********************************************
       // test handle of multithreaded test
  @@ -263,6 +351,8 @@
                       assertNotNull("All buyers have a reference to an Address", account.getBuyer().getAddress());
                       assertNotNull("All addresses have a reference to an AdressType", account.getBuyer().getAddress().getType());
                       assertNotNull("All AddressType have a name", account.getBuyer().getAddress().getType().getName());
  +                    assertNotNull("All buyers have populated 1:n reference to Invoice", account.getBuyer().getInvoices());
  +                    assertNotNull("All buyers have populated 1:n reference to Article", account.getBuyer().getArticles());
                       // System.out.println(""+Thread.currentThread().toString()+": passed");
                   }
               }
  @@ -291,6 +381,8 @@
                       assertNotNull("All buyers have a reference to an Address", account.getBuyer().getAddress());
                       assertNotNull("All addresses have a reference to an AdressType", account.getBuyer().getAddress().getType());
                       assertNotNull("All AddressType have a name", account.getBuyer().getAddress().getType().getName());
  +                    assertNotNull("All buyers have populated 1:n reference to Invoice", account.getBuyer().getInvoices());
  +                    assertNotNull("All buyers have populated 1:n reference to Article", account.getBuyer().getArticles());
                       // System.out.println(""+Thread.currentThread().toString()+": passed");
                   }
               }
  @@ -335,6 +427,8 @@
               assertNotNull("All buyers have a reference to an Address", account.getBuyer().getAddress());
               assertNotNull("All addresses have a reference to an AdressType", account.getBuyer().getAddress().getType());
               assertNotNull("All AddressType have a name", account.getBuyer().getAddress().getType().getName());
  +            assertNotNull("All buyers have populated 1:n reference to Invoice", account.getBuyer().getInvoices());
  +                    assertNotNull("All buyers have populated 1:n reference to Article", account.getBuyer().getArticles());
           }
       }
   
  @@ -359,6 +453,8 @@
               assertEquals(name, account.getBuyer().getAddress().getName());
               assertNotNull("All addresses have a reference to an AdressType", account.getBuyer().getAddress().getType());
               assertNotNull("All AddressType have a name", account.getBuyer().getAddress().getType().getName());
  +            assertNotNull("All buyers have populated 1:n reference to Invoice", account.getBuyer().getInvoices());
  +            assertNotNull("All buyers have populated 1:n reference to Article", account.getBuyer().getArticles());
           }
       }
   
  @@ -407,13 +503,18 @@
       public interface Buyer extends Base
       {
           Address getAddress();
  -
           void setAddress(Address address);
  +        public List getInvoices();
  +        public void setInvoices(List invoices);
  +        public List getArticles();
  +        public void setArticles(List articles);
       }
   
       public static class BuyerImpl extends BaseImpl implements Buyer
       {
  -        Address address;
  +        private Address address;
  +        private List invoices;
  +        private List articles;
   
           public BuyerImpl(String name, Address address)
           {
  @@ -421,6 +522,14 @@
               this.address = address;
           }
   
  +        public BuyerImpl(String name, Address address, List invoices, List articles)
  +        {
  +            super(name);
  +            this.address = address;
  +            this.invoices = invoices;
  +            this.articles = articles;
  +        }
  +
           public BuyerImpl(Address address)
           {
               this.address = address;
  @@ -431,6 +540,26 @@
   
           }
   
  +        public List getInvoices()
  +        {
  +            return invoices;
  +        }
  +
  +        public void setInvoices(List invoices)
  +        {
  +            this.invoices = invoices;
  +        }
  +
  +        public List getArticles()
  +        {
  +            return articles;
  +        }
  +
  +        public void setArticles(List articles)
  +        {
  +            this.articles = articles;
  +        }
  +
           public Address getAddress()
           {
               return address;
  @@ -539,6 +668,91 @@
           public void setName(String name)
           {
               this.name = name;
  +        }
  +    }
  +
  +    public static interface Invoice extends Base
  +    {
  +        public String getInvoiceNumber();
  +        public void setInvoiceNumber(String invoiceNumber);
  +    }
  +
  +    public static class InvoiceImpl extends BaseImpl implements Invoice
  +    {
  +        private String invoiceNumber;
  +        private Integer buyerId;
  +
  +        public InvoiceImpl()
  +        {
  +        }
  +
  +        public InvoiceImpl(String name, String invoiceNumber)
  +        {
  +            super(name);
  +            this.invoiceNumber = invoiceNumber;
  +        }
  +
  +
  +        public Integer getBuyerId()
  +        {
  +            return buyerId;
  +        }
  +
  +        public void setBuyerId(Integer buyerId)
  +        {
  +            this.buyerId = buyerId;
  +        }
  +
  +        public String getInvoiceNumber()
  +        {
  +            return invoiceNumber;
  +        }
  +
  +        public void setInvoiceNumber(String invoiceNumber)
  +        {
  +            this.invoiceNumber = invoiceNumber;
  +        }
  +    }
  +
  +    public static interface Article extends Base
  +    {
  +        public String getDescription();
  +        public void setDescription(String description);
  +    }
  +
  +    public static class ArticleImpl extends BaseImpl implements Article
  +    {
  +        private String description;
  +        private Integer buyerId;
  +
  +        public ArticleImpl()
  +        {
  +        }
  +
  +        public ArticleImpl(String name, String description)
  +        {
  +            super(name);
  +            this.description = description;
  +        }
  +
  +        public Integer getBuyerId()
  +        {
  +            return buyerId;
  +        }
  +
  +        public void setBuyerId(Integer buyerId)
  +        {
  +            this.buyerId = buyerId;
  +        }
  +
  +        public String getDescription()
  +        {
  +            return description;
  +        }
  +
  +        public void setDescription(String description)
  +        {
  +            this.description = description;
           }
       }
   }
  
  
  
  No                   revision
  No                   revision
  1.17.2.2  +95 -3     db-ojb/src/test/org/apache/ojb/repository_junit_reference.xml
  
  Index: repository_junit_reference.xml
  ===================================================================
  RCS file: /home/cvs/db-ojb/src/test/org/apache/ojb/repository_junit_reference.xml,v
  retrieving revision 1.17.2.1
  retrieving revision 1.17.2.2
  diff -u -r1.17.2.1 -r1.17.2.2
  --- repository_junit_reference.xml	11 Sep 2004 17:42:08 -0000	1.17.2.1
  +++ repository_junit_reference.xml	28 Sep 2004 14:13:50 -0000	1.17.2.2
  @@ -1175,6 +1175,14 @@
           <extent-class class-ref="org.apache.ojb.broker.MultithreadedReadTest$AddressTypeImpl"/>
       </class-descriptor>
   
  +    <class-descriptor class="org.apache.ojb.broker.MultithreadedReadTest$Invoice">
  +        <extent-class class-ref="org.apache.ojb.broker.MultithreadedReadTest$InvoiceImpl"/>
  +    </class-descriptor>
  +
  +    <class-descriptor class="org.apache.ojb.broker.MultithreadedReadTest$Article">
  +        <extent-class class-ref="org.apache.ojb.broker.MultithreadedReadTest$ArticleImpl"/>
  +    </class-descriptor>
  +
       <class-descriptor
          class="org.apache.ojb.broker.MultithreadedReadTest$AccountImpl"
          table="READTEST_ACCOUNT"
  @@ -1215,6 +1223,68 @@
       </class-descriptor>
   
       <class-descriptor
  +       class="org.apache.ojb.broker.MultithreadedReadTest$ArticleImpl"
  +       table="READTEST_ARTICLE"
  +    >
  +       <field-descriptor
  +          name="id"
  +          column="OJB_ID"
  +          jdbc-type="INTEGER"
  +          primarykey="true"
  +          autoincrement="true"
  +       />
  +
  +        <field-descriptor
  +          name="buyerId"
  +          column="FK_REF"
  +          jdbc-type="INTEGER"
  +       />
  +
  +      <field-descriptor
  +          name="name"
  +          column="NAME"
  +          jdbc-type="VARCHAR"
  +       />
  +
  +        <field-descriptor
  +          name="description"
  +          column="DESCRIPTION"
  +          jdbc-type="VARCHAR"
  +       />
  +    </class-descriptor>
  +
  +    <class-descriptor
  +       class="org.apache.ojb.broker.MultithreadedReadTest$InvoiceImpl"
  +       table="READTEST_INVOICE"
  +    >
  +       <field-descriptor
  +          name="id"
  +          column="OJB_ID"
  +          jdbc-type="INTEGER"
  +          primarykey="true"
  +          autoincrement="true"
  +       />
  +
  +        <field-descriptor
  +          name="buyerId"
  +          column="FK_REF"
  +          jdbc-type="INTEGER"
  +       />
  +
  +      <field-descriptor
  +          name="name"
  +          column="NAME"
  +          jdbc-type="VARCHAR"
  +       />
  +
  +        <field-descriptor
  +          name="invoiceNumber"
  +          column="INVOICE_NUMBER"
  +          jdbc-type="VARCHAR"
  +       />
  +    </class-descriptor>
  +
  +    <class-descriptor
          class="org.apache.ojb.broker.MultithreadedReadTest$BuyerImpl"
          table="READTEST_BUYER"
           proxy="dynamic"
  @@ -1244,12 +1314,34 @@
             name="address"
             class-ref="org.apache.ojb.broker.MultithreadedReadTest$Address"
             auto-retrieve="true"
  -          auto-update="true"
  -          auto-delete="false"
  +          auto-update="none"
  +          auto-delete="none"
             proxy="false"
          >
             <foreignkey field-ref="fk"/>
          </reference-descriptor>
  +
  +        <collection-descriptor
  +            name="articles"
  +            element-class-ref="org.apache.ojb.broker.MultithreadedReadTest$Article"
  +            proxy="false"
  +            auto-retrieve="true"
  +            auto-update="none"
  +            auto-delete="none"
  +       >
  +          <inverse-foreignkey field-ref="buyerId"/>
  +       </collection-descriptor>
  +
  +        <collection-descriptor
  +            name="invoices"
  +            element-class-ref="org.apache.ojb.broker.MultithreadedReadTest$Invoice"
  +            proxy="false"
  +            auto-retrieve="true"
  +            auto-update="none"
  +            auto-delete="none"
  +       >
  +          <inverse-foreignkey field-ref="buyerId"/>
  +       </collection-descriptor>
       </class-descriptor>
   
       <class-descriptor
  
  
  

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