UnsatisfiedLinkError/Error al abrir el socket al iniciar OpenJPA-Junit-Test a través de Ant-Script

Hola expertos en OpenJpa y DB2,

Recibo el siguiente mensaje de error (stacktrace a continuación). El error aparece cuando la prueba Junit afectada se inicia desde un script ant. Iniciar Junit-Test manualmente en Eclipse funciona sin problemas. Por lo tanto, la excepción parece ser extraña. Para cualquier tipo de entrada, que podría impulsar el análisis en la dirección correcta, estaría agradecido.

Further Information :

Drivers:
    db2jcc.jar
    db2jcc_license_cu.jar
    [Version 3.64.82]

OpenJPA Version : 2.1.2

Persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">

    <persistence-unit name="mypersistenceunit" transaction-type="RESOURCE_LOCAL">
    <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
    <class>common.data.domain.MyDomainObjectx</class>
    <class>common.data.domain.MyDomainObjecty</class>

     <properties>
       <property name="openjpa.ReadLockLevel" value="none"/> 
       <property name="openjpa.Log" value="DefaultLevel=TRACE, Runtime=TRACE, Tool=TRACE, SQL=TRACE, Enhance=TRACE"/>
       <property name="openjpa.ConnectionFactoryProperties" value="PrettyPrint=true, PrettyPrintLineLength=72"/>             
<property name="javax.persistence.jdbc.driver" value="com.ibm.db2.jcc.DB2Driver"/>                       
       <property name="javax.persistence.jdbc.url" value="jdbc:db2://xyz:62000/MyDBInstance"/>                                                             
       <property name="javax.persistence.jdbc.user" value="myuser"/>
       <property name="javax.persistence.jdbc.password" value="mypass"/>         
     </properties>

    </persistence-unit>
</persistence>

[junit] at org.apache.openjpa.jdbc.schema.DataSourceFactory.newConnectException(DataSourceFactory.java:261)
[junit] at org.apache.openjpa.jdbc.schema.DataSourceFactory.installDBDictionary(DataSourceFactory.java:247)
[junit] at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getConnectionFactory(JDBCConfigurationImpl.java:733)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
[junit] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
[junit] at java.lang.reflect.Method.invoke(Method.java:611)
[junit] at org.apache.openjpa.lib.conf.ConfigurationImpl.instantiateAll(ConfigurationImpl.java:295)
[junit] at org.apache.openjpa.conf.OpenJPAConfigurationImpl.instantiateAll(OpenJPAConfigurationImpl.java:1652)
[junit] at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:645)
[junit] at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:204)
[junit] at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156)
[junit] at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:227)
[junit] at com.ibm.ws.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:50)
[junit] at com.ibm.ws.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:35)
[junit] xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
[junit] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
[junit] at java.lang.reflect.Method.invoke(Method.java:611)
[junit] at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
[junit] at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
[junit] at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
[junit] at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
[junit] at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
[junit] at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
[junit] at junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:39)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:420)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:911)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:768)
[junit] Caused by: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][3.64.82] Exception java.lang.reflect.InvocationTargetException: Error opening socket to server xyz.com/11.11.111.11 on port 62,000 with message: null. ERRORCODE=-4499, SQLSTATE=08001
[junit] at com.ibm.db2.jcc.am.bd.a(bd.java:321)
[junit] at com.ibm.db2.jcc.am.bd.a(bd.java:340)
[junit] at com.ibm.db2.jcc.t4.vb.a(vb.java:436)
[junit] at com.ibm.db2.jcc.t4.vb.<init>(vb.java:93)
[junit] at com.ibm.db2.jcc.t4.a.b(a.java:355)
[junit] at com.ibm.db2.jcc.t4.b.newAgent_(b.java:2026)
[junit] at com.ibm.db2.jcc.am.Connection.initConnection(Connection.java:718)
[junit] at com.ibm.db2.jcc.am.Connection.<init>(Connection.java:667)
[junit] at com.ibm.db2.jcc.t4.b.<init>(b.java:332)
[junit] at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:232)
[junit] at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:198)
[junit] at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:475)
[junit] at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:116)
[junit] at org.apache.openjpa.jdbc.schema.SimpleDriverDataSource.getSimpleConnection(SimpleDriverDataSource.java:96)
[junit] at org.apache.openjpa.jdbc.schema.SimpleDriverDataSource.getConnection(SimpleDriverDataSource.java:92)
[junit] at org.apache.openjpa.jdbc.schema.SimpleDriverDataSource.getConnection(SimpleDriverDataSource.java:88)
[junit] at org.apache.openjpa.lib.jdbc.DelegatingDataSource.getConnection(DelegatingDataSource.java:139)
[junit] at org.apache.openjpa.lib.jdbc.DecoratingDataSource.getConnection(DecoratingDataSource.java:112)
[junit] at org.apache.openjpa.jdbc.schema.DataSourceFactory.installDBDictionary(DataSourceFactory.java:239)
[junit] ... 28 more
[junit] Caused by: java.lang.reflect.InvocationTargetException
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
[junit] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
[junit] at java.lang.reflect.Method.invoke(Method.java:611)
[junit] at com.ibm.db2.jcc.t4.v.run(v.java:69)
[junit] at java.security.AccessController.doPrivileged(AccessController.java:251)
[junit] at com.ibm.db2.jcc.t4.vb.a(vb.java:422)
[junit] ... 44 more
[junit] Caused by: java.lang.UnsatisfiedLinkError: com/ibm/net/SocketUtils.configureKeepAlive(JIII)V
[junit] at com.ibm.net.SocketUtils.configureKeepAlive(SocketUtils.java:233)
[junit] ... 51 more
[junit] )
[junit] class load: org.apache.tools.ant.taskdefs.optional.junit.JUnitTaskMirrorImpl$VmExitErrorTest from: file:/C:/IBM/Ressource/SDP/plugins/org.apache.ant_1.7.1.v20100518-1145/lib/ant-junit.jar
[junit] class load: java/util/Collections$1
[junit] class load: org/w3c/dom/CDATASection
[junit] class load: org/apache/xerces/dom/CDATASectionImpl
[junit] Tests run: 0, Failures: 0, Errors: 1, Time elapsed: 3.391 sec
[junit] class load: sun/nio/cs/UTF8_Encoder
[junit] class load: sun/nio/cs/UTF_8$Encoder
[junit] class load: org.apache.tools.ant.util.DOMElementWriter from: file:/C:/IBM/Ressource/SDP/plugins/org.apache.ant_1.7.1.v20100518-1145/lib/ant.jar
[junit] class load: org.apache.tools.ant.util.DOMElementWriter$XmlNamespacePolicy from: file:/C:/IBM/Ressource/SDP/plugins/org.apache.ant_1.7.1.v20100518-1145/lib/ant.jar
[junit] class load: java/util/IdentityHashMap$1
[junit] class load: java/util/IdentityHashMap$IdentityHashMapIterator
[junit] class load: java/util/IdentityHashMap$1$1
[junit] class load: java/util/IdentityHashMap$IdentityHashMapEntry
[junit] class load: com/ibm/tools/attach/javaSE/AttachHandler$1
[junit] class load: java/lang/Thread$State
[junit] class load: java/io/DeleteOnExitHook