Class instances creation using MEF

Hi,
I have class implementing one interface e.g.
interface IFoo
Class Foo : IFoo
Using ServiceLocator, I want to create multiple instances of class in following manner: -
1. instance CommonFoo
2. instance SpecificFoo1
3. instance SpecificFoo2
How to export this class in such a way that if I pass "Specific" as parameter to ServiceLocator it will create new instance every time. But if I pass "Common" as parameter, ServiceLocator will create only one instance
Regards,
Sharda

Hi Sharda,
Per my understanding, you want to determine retrieving Singleton object programmatically. From the description of the following link,
http://blogs.msdn.com/b/gblock/archive/2009/01/29/managed-extensibility-framework-preview-4-a-grab-bag-of-goodies.aspx, it is supported from MEF version 4. Please check it and try the solution on that blog. Feel free to let me know the result.
Regards,
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#=======================================================================================
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#=======================================================================================
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#=======================================================================================
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#=======================================================================================
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#=======================================================================================
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#=======================================================================================
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#=======================================================================================
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cd('Property/user')
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getDatabaseDefaults()
#=======================================================================================
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#=======================================================================================
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#=======================================================================================
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#=======================================================================================
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And the complete exception trace.
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
Error: writeDomain() failed. Do dumpStack() to see details.
wls:/offline/base_domain>dumpStack();
com.oracle.cie.domain.script.jython.WLSTException: com.oracle.cie.domain.script.ScriptException: Domain Creation Failed!
Domain Location: /u01/data/user_projects/domains/cc_domain
Reason: oracle.security.opss.tools.lifecycle.LifecycleException: oracle.security.jps.service.policystore.PolicyStoreException: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
Exception:
oracle.security.opss.tools.lifecycle.LifecycleException: oracle.security.jps.service.policystore.PolicyStoreException: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
at com.oracle.cie.domain.script.jython.CommandExceptionHandler.handleException(CommandExceptionHandler.java:55)
at com.oracle.cie.domain.script.jython.WLScriptContext.handleException(WLScriptContext.java:1967)
at com.oracle.cie.domain.script.jython.WLScriptContext.writeDomain(WLScriptContext.java:1126)
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:606)
at org.python.core.PyReflectedFunction.__call__(Unknown Source)
at org.python.core.PyMethod.__call__(Unknown Source)
at org.python.core.PyObject.__call__(Unknown Source)
at org.python.core.PyInstance.invoke(Unknown Source)
at org.python.pycode._pyx5.writeDomain$15(/tmp/WLSTOfflineIni4846195865917165143.py:73)
at org.python.pycode._pyx5.call_function(/tmp/WLSTOfflineIni4846195865917165143.py)
at org.python.core.PyTableCode.call(Unknown Source)
at org.python.core.PyTableCode.call(Unknown Source)
at org.python.core.PyFunction.__call__(Unknown Source)
at org.python.pycode._pyx93.f$0(<console>:1)
at org.python.pycode._pyx93.call_function(<console>)
at org.python.core.PyTableCode.call(Unknown Source)
at org.python.core.PyCode.call(Unknown Source)
at org.python.core.Py.runCode(Unknown Source)
at org.python.core.Py.exec(Unknown Source)
at org.python.util.PythonInterpreter.exec(Unknown Source)
at org.python.util.InteractiveInterpreter.runcode(Unknown Source)
at org.python.util.InteractiveInterpreter.runsource(Unknown Source)
at org.python.util.InteractiveInterpreter.runsource(Unknown Source)
at weblogic.management.scripting.WLST.main(WLST.java:219)
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:606)
at weblogic.WLST.main(WLST.java:29)
Caused by: com.oracle.cie.domain.script.ScriptException: Domain Creation Failed!
Domain Location: /u01/data/user_projects/domains/cc_domain
Reason: oracle.security.opss.tools.lifecycle.LifecycleException: oracle.security.jps.service.policystore.PolicyStoreException: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
Exception:
oracle.security.opss.tools.lifecycle.LifecycleException: oracle.security.jps.service.policystore.PolicyStoreException: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
at com.oracle.cie.domain.script.ScriptExecutor.runGenerator(ScriptExecutor.java:3706)
at com.oracle.cie.domain.script.ScriptExecutor.writeDomain(ScriptExecutor.java:991)
at com.oracle.cie.domain.script.jython.WLScriptContext.writeDomain(WLScriptContext.java:1117)
... 29 more
Caused by: com.oracle.cie.domain.security.external.ConfigSecurityException: oracle.security.opss.tools.lifecycle.LifecycleException: oracle.security.jps.service.policystore.PolicyStoreException: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
at oracle.security.opss.tools.lifecycle.cie.OpssSecurityConfiguration.initializeSubsystem(OpssSecurityConfiguration.java:129)
at com.oracle.cie.domain.DomainGenerator.run(DomainGenerator.java:315)
at java.lang.Thread.run(Thread.java:744)
Caused by: oracle.security.opss.tools.lifecycle.LifecycleException: oracle.security.jps.service.policystore.PolicyStoreException: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
at oracle.security.opss.tools.lifecycle.OpssDomainConfigImpl.checkIfFarmExists(OpssDomainConfigImpl.java:708)
at oracle.security.opss.tools.lifecycle.OpssDomainConfigImpl.configureDBSecurityStore(OpssDomainConfigImpl.java:339)
at oracle.security.opss.tools.lifecycle.OpssDomainConfigImpl.initializeSubsystem(OpssDomainConfigImpl.java:166)
at oracle.security.opss.tools.lifecycle.cie.OpssSecurityConfiguration.initializeSubsystem(OpssSecurityConfiguration.java:126)
... 2 more
Caused by: oracle.security.jps.service.policystore.PolicyStoreException: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
at oracle.security.jps.internal.policystore.rdbms.JpsDBDataManager.processJPAException(JpsDBDataManager.java:2088)
at oracle.security.jps.internal.policystore.rdbms.JpsDBDataManager.init(JpsDBDataManager.java:955)
at oracle.security.jps.internal.policystore.rdbms.JpsDBDataManager.beginTransaction(JpsDBDataManager.java:1459)
at oracle.security.jps.internal.policystore.rdbms.JpsDBDataManager.beginTransaction(JpsDBDataManager.java:1455)
at oracle.security.jps.internal.common.rdbms.util.JpsDbBootstrapImpl.<init>(JpsDbBootstrapImpl.java:162)
at oracle.security.opss.tools.lifecycle.OpssDomainConfigImpl.checkIfFarmExists(OpssDomainConfigImpl.java:679)
... 5 more
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:614)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:186)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:278)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:304)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:282)
at oracle.security.jps.internal.policystore.rdbms.JpsDBDataManager.getVersion(JpsDBDataManager.java:1027)
at oracle.security.jps.internal.policystore.rdbms.JpsDBDataManager.getEMFAndSubject(JpsDBDataManager.java:1124)
at oracle.security.jps.internal.policystore.rdbms.JpsDBDataManager.init(JpsDBDataManager.java:907)
... 9 more
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified
Error Code: 17002
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:319)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:690)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:215)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:554)
... 16 more
Caused by: java.sql.SQLRecoverableException: IO Error: Unknown host specified
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:465)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:546)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:232)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:187)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
... 20 more
Caused by: oracle.net.ns.NetException: Unknown host specified
at oracle.net.resolver.HostnameNamingAdapter.resolve(HostnameNamingAdapter.java:191)
at oracle.net.resolver.NameResolver.resolveName(NameResolver.java:133)
at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:416)
at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:687)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:247)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1109)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:316)
... 27 more
Any help/pointers/hints will be helpful
Thanks,
Santosh

Hi Micheal,
Thanks a Lot for your response.
We have checked the OS requirements :
System Itanium 11i (11.31) B.11.31.0803.318a Base Quality Pack Bundle for HP-UX 11i v3, March 2008+
Response:
======
We have the higher version installed for this quality pack.
QPKBASE B.11.31.1109.367a Base Quality Pack Bundle for HP-UX 11i v3, September 2011
2) Required Packages : HPDesktopDev (version B.11.31.01)
Response:
=======
This package is also installed.
X11MotifDevKit B.11.31.01 HP-UX Desktop Developer's Toolkit - X11, Motif, and Imake
3) Required Operating System Patches
PHKL_36248
PHKL_36249
PHSS_37202
PHSS_37501
PHCO_38050
PHSS_38139
Response:
========
We have the supersets for these patches installed. The installation logs also confirm these patches at the OS level.
Check Name:Patches
Check Description:This is a prerequisite condition to test whether the patches recommended for installing the product are available on the system.
Checking for PHKL_36248; found PHKL_36248. Passed
Checking for PHKL_36249; found PHKL_36249. Passed
Checking for PHSS_37202; found PHSS_37202. Passed
Checking for PHSS_37501; found PHSS_37501. Passed
Checking for PHCO_38050; found PHCO_38050. Passed
Checking for PHSS_38139; found PHSS_38139. Passed
Check complete. The overall result of this check is: Passed
Regards
Sumit Kapila

XML document creation using reflection

Hi all,
I'm tyring to write a class which creates an XML document from objects passed in. For example, you call the add(Object) method and it takes your object, uses reflection, then outputs XML like this...
<fieldName>fieldValue<fieldName>
The only problem is that after looking through this forum I am a little concerned about the performance of my proposed solution (using reflection).
The class will be used in a batch process which processes millions of objects (to generate a whopping XML file that'll be sent on for further processing by a third party).
Is there a better way to do this than by using reflection?
This class is going to be used by multiple batch processes hence there will be lots of different object types passed (they'll also be new ones in the future that we don't even know about yet) hence my reflection choice.
Thanks,
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The only problem is that after looking through this
forum I am a little concerned about the performance of
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Is there a better way to do this than by using
reflection?Probably not, if you want to pass any arbitrary object to it.
One possible alternative is to have "XML aware" objects: define an interface WritesXML, that defines a method toXML(). You then check to see whether the given object implements this interface, and if it does you simply call the method, otherwise you use reflection.
Another alternative, assuming that your objects follow the Bean pattern, is to create "XML-ifiers" on the fly, similar to the way an app-server handles JSPs. First time you see an object you create a class that will write it to XML, then compile this class and invoke it for all subsequent objects. This will require that you have a JDK installed on the runtime machine, that the objects follow the Bean pattern, and that the number of instances of a given class are very high.
This class is going to be used by multiple batch
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types passed (they'll also be new ones in the future
that we don't even know about yet) hence my reflection
choice.Sounds like a good reason to use reflection.

Process instance creation on 5.5 from a process A to a process B Dif engine

Process Instance creation on 5.5 from a Process A to a Process B on different engine.
I have 5.5 enterprise with 2 engines.
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break;
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Nico

Hi, just an update, at least now I have an error message on the first button,
there was a condition that I left over preventing it to work,
I have also amended the JavaScript code removing " from the "dataType"
Its now
function PrintSelectedItems()
var r = confirm("In print selected items");
apex.server.process('DISPLAY_SELECTED_ITEMS',
{"x01": "Sent from Page 5",
dataType: "text"},
{success: function(data){alert("here->" + data);}}
and I get Error: parsererror - SyntaxError: JSON.parse: unexpected character

Dynamic class loading problem using unknown JAR archive and directory names

I read the following article, which enlightened me a lot:
Ted Neward: Understanding Class.forName().
However, it took me some while to understand that my problem is the other way around:
I know the name of the class, I know the name of the method,
but my program/JVM does not know where to load the classes from.
Shortly, my problem is that the server engine that I am writing
uses two different versions of the same library.
So I am trying out the following solution:
My program is named TestClassPathMain.java
Assume the two libraries are named JAR1.jar and JAR2.jar
and the class/instance method that should
be exposed to TestClassPathMain.java by them is named
TestClass1.testMethod().
As long as I was depending on just one library,
I put JAR1.jar in the classpath before starting java,
and I was happy for a while.
At the moment I got the need to use another version of
TestClass1.testMethod() packaged in JAR2.jar,
a call would always access JAR1.jar's
TestClass1.testMethod().
I then decided to remove JAR1.jar from the classpath,
and programmatically define two separate ClassLoaders, one for use
with JAR1.jar and the other for use with JAR2.jar.
However, the problem is only partly solved.
Please refer to the enclosed code for details.
(The code in the JAR1.jar/JAR2.jar is extremely simple,
it just tells (by hardcoding) the name of the jar it is packaged in
and instantiates another class packaged in the same jar using
the "new" operator and calls a method on it. I don't enclose it.)
The TestClassPathMain.java/UC1.java/UC2.java code suite was
successfully compiled with an arbitrary of JAR1 or JAR2 in the classpath,
however removed from the classpath at runtime.
(I know that this could have been done (more elegantly...?) by producing an Interface,
but I think the main problem principle is still untouched by this potential lack of elegancy(?))
1) This problem should not be unknown to you experts out there,
how is it generally and/or most elegantly solved?
The "*** UC2: Variant 2" is the solution I would like best, had it only worked.
2) And why arent "*** UC2: Variant 2" and
"*** static UC2: Variant 2" working,
while "*** Main: Variant 2" is?
3) And a mal-apropos:
Why can't I catch the NoClassDefFoundError?
The output:
*** Main: Variant 1 JAR 1 ***:
Entering TestClass1.testMethod() packaged in JAR1.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR1.jar
*** Main: Variant 1 JAR 2 ***:
Entering TestClass1.testMethod() packaged in JAR2.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR2.jar
*** Main: Variant 2 JAR 1 ***:
Entering TestClass1.testMethod() packaged in JAR1.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR1.jar
*** Main: Variant 2 JAR 2 ***:
Entering TestClass1.testMethod() packaged in JAR2.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR2.jar
*** UC1: Variant 1 JAR 1 ***:
Entering TestClass1.testMethod() packaged in JAR1.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR1.jar
*** UC1: Variant 1 JAR 2 ***:
Entering TestClass1.testMethod() packaged in JAR2.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR2.jar
*** static UC2: Variant 2 JAR 1 ***:
Exception in thread "main" java.lang.NoClassDefFoundError: TestClass1
        at UC2.runFromJarVariant2_static(UC2.java:56)
        at TestClassPathMain.main(TestClassPathMain.java:52)
TestClassPathMain.java
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class TestClassPathMain {
    public static void main(final String args[]) throws MalformedURLException, ClassNotFoundException, InstantiationException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
            // Commented out because I cannot catch the NoClassDefFoundError.
            // Why?
            try {
                final TestClass1 testClass1 = new TestClass1();
                System.out.println(
                    "\nThe class TestClass1 is of some unexplicable reason available." +
                    "\nFor the purpose of the test, it shouldn't have been!" +
                    "\nExiting");
                System.exit(1);
            } catch (NoClassDefFoundError e) {
                System.out.println("\nPositively confirmed that the class TestClass1 is not available:\n" + e);
                System.out.println("\n\nREADY FOR THE TEST: ...");
            // Works fine
            System.out.println("\n*** Main: Variant 1 JAR 1 ***:");
            runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** Main: Variant 1 JAR 2 ***:");
            runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Works fine
            System.out.println("\n*** Main: Variant 2 JAR 1 ***:");
            runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** Main: Variant 2 JAR 2 ***:");
            runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Works fine
            final UC1 uc1 = new UC1();
            System.out.println("\n*** UC1: Variant 1 JAR 1 ***:");
            uc1.runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** UC1: Variant 1 JAR 2 ***:");
            uc1.runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Crashes
            System.out.println("\n*** static UC2: Variant 2 JAR 1 ***:");
            UC2.runFromJarVariant2_static("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** static UC2: Variant 2 JAR 2 ***:");
            UC2.runFromJarVariant2_static("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Crashes
            final UC2 uc2 = new UC2();
            System.out.println("\n*** UC2: Variant 2 JAR 1 ***:");
            uc2.runFromJarVariant2("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** UC2: Variant 2 JAR 2 ***:");
            uc2.runFromJarVariant2("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
    private static void runFromJarVariant1(final String jarFileURL)
        throws MalformedURLException,
               ClassNotFoundException,
               InstantiationException,
               IllegalArgumentException,
               IllegalAccessException,
               InvocationTargetException,
               SecurityException,
               NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
            new URLClassLoader(new URL[]{url},
                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final Object testClass1 = clazz.newInstance();
        final Method testMethod1 = clazz.getMethod("testMethod", null);
        testMethod1.invoke(testClass1, null);
    private static void runFromJarVariant2(final String jarFileURL)
        throws MalformedURLException,
               ClassNotFoundException,
               InstantiationException,
               IllegalArgumentException,
               IllegalAccessException,
               InvocationTargetException,
               SecurityException,
               NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
            new URLClassLoader(new URL[]{url},
                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final TestClass1 testClass1 = new TestClass1();
        testClass1.testMethod();
UC1.java
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class UC1 {
    public void runFromJarVariant1(final String jarFileURL)
        throws MalformedURLException,
               ClassNotFoundException,
               InstantiationException,
               IllegalArgumentException,
               IllegalAccessException,
               InvocationTargetException,
               SecurityException,
               NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
            new URLClassLoader(new URL[]{url},
                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final Object testClass1 = clazz.newInstance();
        final Method testMethod1 = clazz.getMethod("testMethod", null);
        testMethod1.invoke(testClass1, null);
UC2.java
import java.lang.reflect.InvocationTargetException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class UC2 {
    public void runFromJarVariant2(final String jarFileURL)
    throws MalformedURLException,
           ClassNotFoundException,
           InstantiationException,
           IllegalArgumentException,
           IllegalAccessException,
           InvocationTargetException,
           SecurityException,
           NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
            new URLClassLoader(new URL[]{url},
                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final TestClass1 testClass1 = new TestClass1();
        testClass1.testMethod();
     * Identic to the "runFromJarVariant2" method,
     * except that it is static
    public static void runFromJarVariant2_static(final String jarFileURL)
    throws MalformedURLException,
           ClassNotFoundException,
           InstantiationException,
           IllegalArgumentException,
           IllegalAccessException,
           InvocationTargetException,
           SecurityException,
           NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
            new URLClassLoader(new URL[]{url},
                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final TestClass1 testClass1 = new TestClass1();
        testClass1.testMethod();
}

2. i need to load the class to the same JVM (i.e. to
the same environment) of the current running
aplication, so that when the loaded class is run, it
would be able to invoke methods on it!!!
ClassLoader(s) do this. Try the URLClassLoader.
(I was talking about relatively esoteric "security"
issues when I mentioned the stuff about Class objects
"scope".) You might use the URLClassLoader kind of
like this.
Pseudo-code follows:
// setup the class loader
URL[] urls = new URL[1];
urls[0] = new URL("/path/to/dynamic/classes");
URLClassLoader ucl = new URLClassLoader(urls);
// load a class & use make an object with the default constructor
Object tmp = ucl.loadClass("dynamic.class.name").newInstance();
// Cast the object to a know interface so that you can use it.
// This may be used to further determine which interface to cast
// the class to. Or it may simply be the interface to which all
// dynamic classes have to conform in your program.
InterfaceImplementedByDynamicClass loadedObj =
    (InterfaceImplementedByDynamicClass)tmp;It's really not as hard as it sounds, just write a little test of
this and you will see how it works.

Binding a JavaFX variable to a Java class instance variable

Hi,
I am pretty new to JavaFX but have been developing in Java for many years. I am trying to develop a JavaFX webservice client. What I am doing is creating a basic scene that displays the data values that I am polling with a Java class that extends Thread. The Java class is reading temperature and voltage from a remote server and storing the response in an instance variable. I would like to bind a JavaFx variable to the Java class instance variable so that I can display the values whenever they change.
var conn: WebserviceConnection; // Java class that extends Thread
var response: WebserviceResponse;
try {
conn = new WebserviceConnection("some_url");
conn.start();
Thread.sleep(10000);
} catch (e:Exception) {
e.printStackTrace();
def bindTemp = bind conn.getResponse().getTemperature();
def bindVolt = bind conn.getResponse().getVoltage();
The WebserviceConnection class is opening a socket connection and reading some data in a separate thread. A regular socket connection is used because the server is not using HTTP.
When I run the application, the bindTemp and bindVolt are not updated whenever new data values are received.
Am I missing something with how bind works? Can I do what I want to do with 'bind'. I basically want to run a separate thread to retrieve data and want my UI to be updated when the data changes.
Is there a better way to do this than the way I am trying to do it?
Thanks for any help in advance.
-Richard

Hi,
If you don't want to constantly poll for value change, you can use the observer design pattern, but you need to modify the classes that serve the values to javafx.
Heres a simple example:
The Thread which updates a value in every second:
// TimeServer.java
public class TimeServer extends Thread {
    private boolean interrupted = false;
    public ValueObject valueObject = new ValueObject();
    @Override
    public void run() {
        while (!interrupted) {
            try {
                valueObject.setValue(Long.toString(System.currentTimeMillis()));
                sleep(1000);
            } catch (InterruptedException ex) {
                interrupted = true;
}The ValueObject class which contains the values we want to bind in javafx:
// ValueObject.java
import java.util.Observable;
public class ValueObject extends Observable {
    private String value;
    public String getValue() {
        return this.value;
    public void setValue(String value) {
        this.value = value;
        fireNotify();
    private void fireNotify() {
        setChanged();
        notifyObservers();
}We also need an adapter class in JFX so we can use bind:
// ValueObjectAdapter.fx
import java.util.Observer;
import java.util.Observable;
public class ValueObjectAdapter extends Observer {
    public-read var value : String;
    public var valueObject : ValueObject
        on replace { valueObject.addObserver(this)}
    override function update(observable: Observable, arg: Object) {
         // We need to run every code in the JFX EDT
         // do not change if the update method can be called outside the Event Dispatch Thread!
         FX.deferAction(
             function(): Void {
                value = valueObject.getValue();
}And finally the main JFX code which displays the canging value:
// Main.fx
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.scene.text.Font;
import threadbindfx.TimeServer;
var timeServer : TimeServer;
var valueObjectAdapter : ValueObjectAdapter = new ValueObjectAdapter();
timeServer = new TimeServer();
valueObjectAdapter.valueObject = timeServer.valueObject;
timeServer.start();
Stage {
    title: "Time Application"
    width: 250
    height: 80
    scene: Scene {
        content: Text {
            font : Font {
                size : 24
            x : 10, y : 30
            content: bind valueObjectAdapter.value;
}This approach uses less cpu time than constant polling, and changes aren't dependent on the polling interval.
However this cannot be applied to code which you cannot change obviously.
I hope this helps.

Which Event Classes i should use for finding good indexs and statistics for queries in SP.

Dear all,
I am trying to use pro filer to create a trace,so that it can be used as workload in
"Database Engine Tuning Advisor" for optimization of one stored procedure.
Please tel me about the Event classes which i should use in trace.
The stored proc contains three insert queries which insert data into a table variable,
Finally a select query is used on same table variable with one union of the same table variable, to generate a sequence for records based on certain condition of few columns.
There are three cases where i am using the above structure of the SP, so there are three SPS out of three , i will chose one based on their performance.
1) There is only one table with three inserts which gets into a table variable with a final sequence creation block.
2) There are 15 tables with 45 inserts , which gets into a tabel variable with a final
sequence creation block.
3)
There are 3 tables with 9 inserts , which gets into a table variable with a final
sequence creation block.
In all the above case number of record will be around 5 lacks.
Purpose is optimization of queries in SP
like which Event Classes i should use for finding good indexs and statistics for queries in SP.
yours sincerely

"Database Engine Tuning Advisor" for optimization of one stored procedure.
Please tel me about the Event classes which i should use in trace.
You can use the "Tuning" template to capture the workload to a trace file that can be used by the DETA. See
http://technet.microsoft.com/en-us/library/ms190957(v=sql.105).aspx
If you are capturing the workload of a production server, I suggest you not do that directly from Profiler as that can impact server performance. Instead, start/stop the Profiler Tuning template against a test server and then script the trace
definition (File-->Export-->Script Trace Definition). You can then customize the script (e.g. file name) and run the script against the prod server to capture the workload to the specified file. Stop and remove the trace after the workload
is captured with sp_trace_setstatus:
DECLARE @TraceID int = <trace id returned by the trace create script>
EXEC sp_trace_setstatus @TraceID, 0; --stop trace
EXEC sp_trace_setstatus @TraceID, 2; --remove trace definition
Dan Guzman, SQL Server MVP, http://www.dbdelta.com

Easily fixing parameters for instance creation script

H all,
In the classical instance creation scripts numerous parameters are repeated even if they are similar. For example, the directory into which saving the different tablespaces is often the same. Also i'm looking for passing them as parameters. My first tries give the following:
-> In the .bat launching the creation:
set MY_DB_USER=sys
set MY_DB_PWD=change_on_install
set MY_DB_NAME=DragNFly
set ORACLE_SID=DragNFly
set MY_DB_CREATION_SOURCE=F:\Oracle\oradata\Instance_creation_scripts
set MY_DB_CREATION_DESTINATION=E:\Oracle_DragNFly
set MY_ORACLE_BIN=F:\oracle\bin
set MY_ORACLE_HOME=F:\oracle
mkdir %MY_ORACLE_HOME%\admin\%ORACLE_SID%\bdump
mkdir %MY_ORACLE_HOME%\admin\%ORACLE_SID%\cdump
mkdir %MY_ORACLE_HOME%\admin\%ORACLE_SIDD%\create
mkdir %MY_ORACLE_HOME%\admin\%ORACLE_SID%\udump
mkdir %MY_DB_CREATION_DESTINATION%\%ORACLE_SID%
%MY_ORACLE_BIN%\oradim.exe -new -sid %ORACLE_SID% -startmode m
%MY_ORACLE_BIN%\oradim.exe -edit -sid %ORACLE_SID% -startmode a
%MY_ORACLE_BIN%\orapwd.exe file=%MY_ORACLE_HOME%\Database\PWD%MY_DB_NAME%.ora password=%MY_DB_PWD%
%MY_ORACLE_BIN%\sqlplus /nolog connect %MY_DB_USER%/%MY_DB_PWD% @%ORACLE_SID% as sysdba
%MY_ORACLE_BIN%\sqlplus /nolog @%MY_DB_CREATION_SOURCE%\StartCreation.sql
-> Then in the first sql file, fixing all the variables and calling the other ones:
DEFINE MY_DB_USER=SYS
DEFINE MY_DB_PWD=change_on_install
DEFINE MY_DB_NAME=DragNFly
DEFINE MY_DB_SID=DragNFly
DEFINE MY_DB_CREATION_DESTINATION=E:\Oracle_DragNFly
DEFINE MY_DB_CREATION_SOURCE=F:\Oracle\oradata\Instance_creation_scripts
DEFINE MY_ORACLE_BIN=F:\oracle\bin
DEFINE MY_ORACLE_HOME=F:\oracle
connect &&MY_DB_USER/&&MY_DB_PWD as SYSDBA
-- # The following files have to be stored in the #
-- # same repertory as the present file #
@@CreateDBdb &&MY_DB_USER &&MY_DB_PWD &&MY_DB_NAME &&MY_DB_SID &&MY_DB_CREATION_DESTINATION &&MY_DB_CREATION_SOURCE &&MY_ORACLE_BIN &&MY_ORACLE_HOME
@@CreateDBtbs &&MY_DB_USER &&MY_DB_PWD &&MY_DB_NAME &&MY_DB_SID &&MY_DB_CREATION_DESTINATION &&MY_DB_CREATION_SOURCE &&MY_ORACLE_BIN &&MY_ORACLE_HOME
@@CreateDBcat &&MY_DB_USER &&MY_DB_PWD &&MY_DB_NAME &&MY_DB_SID &&MY_DB_CREATION_DESTINATION &&MY_DB_CREATION_SOURCE &&MY_ORACLE_BIN &&MY_ORACLE_HOME
@@postDBcreate &&MY_DB_USER &&MY_DB_PWD &&MY_DB_NAME &&MY_DB_SID &&MY_DB_CREATION_DESTINATION &&MY_DB_CREATION_SOURCE &&MY_ORACLE_BIN &&MY_ORACLE_HOME
@@CreateDBuser &&MY_DB_USER &&MY_DB_PWD &&MY_DB_NAME &&MY_DB_SID &&MY_DB_CREATION_DESTINATION &&MY_DB_CREATION_SOURCE &&MY_ORACLE_BIN &&MY_ORACLE_HOME
exit;
-> Finally one example of use in CreateDB.sql is:
connect &&1/&&2 as SYSDBA
set echo on
spool &&5\&&3\Create&&3.db.log
startup nomount pfile="&&6\init_DB.ora";
CREATE DATABASE &&3
MAXINSTANCES 1
MAXLOGHISTORY 1
MAXLOGFILES 5
MAXLOGMEMBERS 3
MAXDATAFILES 100
DATAFILE '&&5\&&3\system_&&3.01.dbf' SIZE 200M REUSE AUTOEXTEND ON NEXT 10M MAXSIZE UNLIMITED
EXTENT MANAGEMENT LOCAL
DEFAULT TEMPORARY TABLESPACE &&3._TMP TEMPFILE '&&5\&&3\temp_&&3.01.dbf' SIZE 1500M REUSE
UNDO TABLESPACE "&&3._UNDO" DATAFILE '&&5\&&3\undo_&&3.01.dbf' SIZE 500M REUSE
CHARACTER SET WE8ISO8859P1
NATIONAL CHARACTER SET AL16UTF16
LOGFILE GROUP 1 ('&&5\&&3\redo_&&3.01.log', '&&5\&&3\redo_&&3.01bis.log') SIZE 102400K,
GROUP 2 ('&&5\&&3\redo_&&3.02.log', '&&5\&&3\redo_&&3.02bis.log') SIZE 102400K,
GROUP 3 ('&&5\&&3\redo_&&3.03.log', '&&5\&&3\redo_&&3.03bis.log') SIZE 102400K;
spool off;
As you can see a first problem is that i have to set the variables the first time in the .bat and a second time in the first .sql. I don't know how to use an unique file for setting all the variables i need.
Second difficulty is: fixing names and directories is a first step but i would like to fix all the different size values in this same file. The goal is to have only one file with dozen of values to change before creating new instances instead of checking all the different parameters inside of the different files.
What is your mind on this?
Probably there are better examples that i don't found?
Regards,
Tif

One error i didn't suspect -> don't using SID with lowercase and uppercase in the name.
Thing i've forgotten to say: variables have to be set both in the .bat and the first .sql but they have to match too with values in the init.ora. That why i would like to simplify all these declarations with unifying them into a single file.
If somebody can help me, please
Tif

Class instances creation using MEF

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