Using java.lang.reflect.Proxy class

I am investigating the uses of the new Proxy object introduced in jdk1.3.
One of the first things I noticed was how slow it was to generate a class via Proxy. The system can spend over 100 millliseconds to generate one. If you create many of those this can suck up alot of time. Is there a way to speed this up? I noticed when I try to cache the Object sent back into one of the java.util Collection I get errors when trying to retrieve them. Usually class cast errors when I call the 'isEmpty' method on the Collection.
I noticed that I could cache them into an array of Objects, I have also been able to store the Class that is generated, and the Constructor, so when new ones were needed I could just call the constructor using the Class that was pre generated.
In my performance tests it took in the order of 2 minutes to generate 100,000 without any cacheing.
When I cached the objects in an [] of Objects that time went down to around 15 seconds. When I cached the Class and Constructor the time went to around 30 seconds.
Has anyone out there attempted to cache Proxy's?
I would appreciate any experience you have had with this.
thanks in advance
chris

Cris,
I am very interested in the caching approach you took. I have an application that uses a lot of proxies, any kind of optimization on proxies would result in a big performance boost.
Thanks,
David

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Using java.lang.reflect.Method.invoke on a static method?

This is probably a FAQ, but I am finding it impossible to construct a search which answers this question for me.
How do I call java.lang.reflect.Method.invoke on a static (e.g. class) method? Is it even possible?
Thanks,
dwh

Is this of any help?
http://www.esus.com/javaindex/j2se/jdk1.2/javalang/reflection/reflection.html
Cheers,
Joris

Advantages,Dis-advantages,when and where -use java.lang.Void Wrapper class

Hi All,
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I like to know when and where to use the wrapper class java.lang.VoidWhy? If you don't need it, you don't have to use it.
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if anyone could give me some examples it will be better.
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How to use java.lang.Class.getMethod() and java.lang.reflect.Method.invoke(

I want to call a specified method of one class dynamically. I use the method
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I have a generic Method Executer that has a method like
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The method I am trying to execute in CategoryDelegate looks like:
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Using OWB in MOC map i am getting error:java.lang.reflect.invoc

Hi All,
When i am trying to deploy any of the ammping using OWB for oracle MOC.
As part of the deployment, when I tried for the first following mapping:
using MTH-->MTH_TARGET--> Mapping
· List of deployable objects and category (EBS-Specific / Non-EBS Specific)
· EBS Specific-Maps : MTH_WO_OI_INIT_DMF_MAP
I am gettinge the following error while opening the map :
java.lang.reflect.invocationtargetexception
Because of that its not deploying at all for any of the mapping.
I am sometimes getting error nested transactions are being carried out .But if I logging in and logging out this error doesn't comes but the error which I mentioned comes. (java.lang.reflect.invocationtargetexception)
Will appreciate, if anybody gets teh same error or have some solution.
Regards,
Ashok.

your error seems to indicate that your embeddedLdap isnt in sync with the Database ? Did you either delete files from your file systems or cleanup the portal db or finally used a copy of some existing database for your domain?

Windows Vista "java.lang.ClassNotFoundException: loader.class" error.

Hello,
Whenever I try to visit websites that have a java applet I get a dialogue with the following error:
java.lang.ClassNotFoundException: loader.class.
I have tried uninstalling/reinstalling java, and also adding the -xmx and -xms parameters for java applet runtime setting in control panel with various values from 128m to 1g.
The applet at http://www.java.com/en/download/installed.jsp?detect=jre&try=1 does work and reports "CONGRATULATIONS, you have the Latest version of Java!", "Java Runtime Version 1.6.0."
I have been experiencing this problem ever since I installed Windows Vista Home Premium a day or two ago. Any help is appreciated.
Regards
Greg
=====================================
Full output from Java Console
=====================================
Java Plug-in 1.6.0
Using JRE version 1.6.0 Java HotSpot(TM) Client VM
User home directory = C:\Users\Greg Taylor
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
load: class loader.class not found.
java.lang.ClassNotFoundException: loader.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
java.lang.ClassNotFoundException: loader.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
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     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more

ive been having the same problems, if youve resolved this problem, please tell me.
all help is appreciated

Work Manager 6.1: java.lang.reflect.InvocationTargetException

Hi all,
Please, I need your help with this issue. I installed Work Manager 6.1 over SMP 3.0.3.
I added a field to complex table ctCatalogGroup. The field was already contemplated on the backend so I only had to add it in Agentry. It worked fine for a while but suddenly it started giving me this error during transmit every time since then:
My Java class looks like this:
And I added the field in Agentry accordingly:
Config Panel parameters for this are:
The first thing I noticed is this error in the SMP log:
2015/04/23 08:29:12.540: + WorkFunction=00000001496AF658
2015/04/23 08:29:12.540: + User=invpos_out30
2015/04/23 08:29:12.540: + Server=Agentry
2015/04/23 08:29:12.540: + Complex Table=ctcatalogprofile
2015/04/23 08:29:12.540: Update BHT 'ctcatalogprofile' for 'User': Client last data update 12:00:01 a.m. 01/01/1900
2015/04/23 08:29:12.540: Update BHT 'ctcatalogprofile' for 'User': Getting back end connections
2015/04/23 08:29:12.540: client last data update=12:00:01 a.m. 01/01/1900
2015/04/23 08:29:12.540: Backend step is configured as a Java Class; using Java class com.syclo.sap.ComplexTable
2015/04/23 08:29:12.540: Using Java Class com.syclo.sap.ComplexTable for ComplexTable
2015/04/23 08:29:12.555: + BackEnd=Java-SAPJavaConnection
2015/04/23 08:29:12.555: Exception while starting complex table update for table 'ctcatalogprofile': JavaBackEndError: JAVA EXCEPTION CAUGHT: java.lang.reflect.InvocationTargetException in AgentryComplexTableFactory::createComplexTable at AgentryComplexTableFactory.cpp:129
As well as this other one in the events.log:
04/23/2015 08:23:32, 0, 20, 16, Thr 9240, Threads in thread pool 'Runtime' expanded to 2. Adding thread 3580
04/23/2015 08:25:13, 1, 29, 1, Thr 3580, java/net/SocketException, java.net.SocketException: Connection reset by peer: socket write errorAngelJavaStreamsConnection.cpp#189:AngelJavaStreamsConnection::handleException
04/23/2015 08:25:13, 1, 4,3221225477, Thr 3580, EXCEPTION_ACCESS_VIOLATION, 000000018000DE02, 0, R, 0000000000000000, ..\agentry\threadManager.cpp#354:ThreadManager::WorkerThread::function
04/23/2015 08:25:27, 0, 0, 6, Thr 7572, invpos_out30: relogin failed at ANGEL: B4A91958-A9A4-46F8-B323-20C61E7E76E8; attempt from ANGEL: 97E1F7AF-4E38-4ECB-8D3C-2E2D4AFEA2AE
04/23/2015 08:25:56, 0, 0, 6, Thr 7572, invpos_out30: relogin failed at ANGEL: B4A91958-A9A4-46F8-B323-20C61E7E76E8; attempt from ANGEL: 15FAC37B-A017-46AB-B528-B2B4610423CC
04/23/2015 08:26:27, 0, 0, 6, Thr 7572, invpos_out30: relogin failed at ANGEL: B4A91958-A9A4-46F8-B323-20C61E7E76E8; attempt from ANGEL: BFDB1CBE-12D9-4A66-8EBA-A855B2B90D23
04/23/2015 08:29:12, 1, 20, 18, Thr 3580, JAVA EXCEPTION CAUGHT: java.lang.reflect.InvocationTargetException
I would like to know if anyone faced something like this before or any suggestions on how to dig deeper for a solution. What confuses me is that it worked ok at first and now I can no longer start the client. That is as far as I can get.
Best regards!
Leonardo.

Hi,
Can you modify the step
public void setProperties(Table tbl) throws Exception {
        super.setProperties(tbl);
        setShortText(tbl.getString("KURZTEXT")).trim());
to
public void setProperties(Table tbl) throws Exception {
        super.setProperties(tbl);
        setShortText(tbl.getString("KURZTEXT"));
Thanks & Regards,
Sravanthi

"SYSTEM FAILURE" during JCo call.java.lang.reflect.UndeclaredThrowableExcep

Hi All
I have developed Java mapping program where I am calling three BAPI in sequence and trying to map all three bapi data to single Target XML file or Multiple target xml files depends on the in coming data.
Now I want these files name should be genereted dynamically .So I have used below Dynamic Configuration code in my java mapping program.********************************************************************************************************************************************************************
try
     String currDate = new String();
     String currTime= new String();
     DateFormat dFormat=new SimpleDateFormat("yyyyMMdd");
     DateFormat tFormat = new SimpleDateFormat("HHmmss");
     java.util.Date date = new Date();
     TimeZone cetTimeZone = TimeZone.getTimeZone("CET");
     tFormat.setTimeZone(cetTimeZone);
     currDate = dFormat.format(date);
     currTime= tFormat.format(date);
     String pubDate=currDate + currTime;
     String ext=".xml";
     String event="-1_1-";
     trace.addInfo("******** Before Dynamic Configuration ***************" );
     DynamicConfiguration conf =(DynamicConfiguration)container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
                                        DynamicConfigurationKey key = DynamicConfigurationKey.create( "http://sap.com/xi/XI/System/File","FileName" );
     trace.addInfo("******** After Dynamic Configuration ***************" );
     String tempFileName="NL09-"eventponum+ "-" pubDateext;
     trace.addInfo("The name of the file is : " + tempFileName);
     conf.put(key, "tempFileName");
            catch (Exception e)
                 trace.addWarning("Error While creating File Name"+e.getMessage());
                 throw new Exception("Error While creating File Name",e);
Now the problem is when I am using above code I am getting following error
"SYSTEM FAILURE" during JCo call.
java.lang.reflect.UndeclaredThrowableException
- <SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">
<SAP:Category>XIServer</SAP:Category>
<SAP:Code area="MAPPING">JCO_SYSTEM_FAILURE</SAP:Code>
<SAP:P1>java.lang.reflect.UndeclaredThrowableException</SAP:P1>
<SAP:P2 />
<SAP:P3 />
<SAP:P4 />
<SAP:AdditionalText />
<SAP:Stack>"SYSTEM FAILURE" during JCo call.
java.lang.reflect.UndeclaredThrowableException</SAP:Stack>
<SAP:Retry>A</SAP:Retry>
</SAP:Error>
Could please tell me why I am facing this problem only when I am using Dynamic configuration code.
If I dont use Dynamic configuration code then I am not getting any error .But my requirement is to generate dynamic file name (Note I have tried with Variable Substution also, It is also not solving my problem as I need time stamp of ("CET") time zone).

Hi Abhishek,
Yes I have appended throws StreamTransformationException and imported the relevant StreamTransformationException class also.
Here I am getting strange thing when I am adding dynamic configuration code " SYSTEM FAILURE" during JCo call. But Jco cal is something to internal systems which does not relate to Dynamic Configuration.
If I run my code with out any Dynamic Configuration code then it is running with out any errors.
But I need this Dynamic Configuration inorder to generate dyanamic file name.

Is there a forName() for java.lang.reflect.Type?

Is there an equivelant to Class.forName() for all types?
For example:forName("java.util.List<java.lang.Sring>");
//or
forName("int");Such a method would return a java.lang.reflect.Type, instead of return a java.lang.Class
See also
Field.getGenericType()
Method.getGenericReturnType()

incidentally, getGenericType() will give you the
generic type of the member being examined, not the
parameterized type.
that is, if I declare a method like this:
public <T extends MyInterface> T getStuff() {
}I won't be able to reflectively find out what types
of T are being used at runtime, only that it's of
type 'T'. of limited use really
Java's implementation of Generics isn't as good as it
could be, mainly to maintain backwards compatibiityYou are right in that case because that is not a ParameterizedType that is a TypeVariable.
Type can encompass both Types.

Exceptions details : java.lang.reflect.InvocationTargetException

I have set up a web service.
Development environment:
1 java 5.0
2 jwsdp 2.0
3 Java system application server 9.0
I set up the web service by following these steps:
1 write endpoint application source code
2 write build file and build properties.
3 use asant command compile the source code (successfully)
4 use "asant generate-runtime-artifacts" generate web service artifacts(successfully)
5 use "asant pkg-war" to package war file. (successfully)
6 use "asant deploy-app " to deploy the web service. (successfully)
So, I can find my webservice in administration console. I click the test button, it pop up a webpage, in which I can input parameters for my web method.
After inputting all the parameters, I clicked the button to invock my web method. But some exceptions occured.
Exceptions details : java.lang.reflect.InvocationTargetException
javax.servlet.ServletException: java.lang.reflect.InvocationTargetException at com.sun.enterprise.webservice.monitoring.WebServiceTesterServlet.doPost(WebServiceTesterServlet.java:311) at com.sun.enterprise.webservice.monitoring.WebServiceTesterServlet.invoke(WebServiceTesterServlet.java:106) at com.sun.enterprise.webservice.JAXWSServlet.doPost(JAXWSServlet.java:135) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566) at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:239) at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667) at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574) at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844) at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287) at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212) at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252) at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at com.sun.enterprise.webservice.monitoring.WebServiceTesterServlet.doPost(WebServiceTesterServlet.java:284) ... 28 more Caused by: javax.xml.ws.soap.SOAPFaultException: Unknown fault type:class java.lang.NoClassDefFoundError at com.sun.xml.ws.encoding.soap.ClientEncoderDecoder.toMessageInfo(ClientEncoderDecoder.java:86) at com.sun.xml.ws.encoding.soap.client.SOAPXMLDecoder.toMessageInfo(SOAPXMLDecoder.java:211) at com.sun.xml.ws.protocol.soap.client.SOAPMessageDispatcher.receive(SOAPMessageDispatcher.java:540) at com.sun.xml.ws.protocol.soap.client.SOAPMessageDispatcher.doSend(SOAPMessageDispatcher.java:260) at com.sun.xml.ws.protocol.soap.client.SOAPMessageDispatcher.send(SOAPMessageDispatcher.java:139) at com.sun.xml.ws.encoding.soap.internal.DelegateBase.send(DelegateBase.java:86) at com.sun.xml.ws.client.EndpointIFInvocationHandler.implementSEIMethod(EndpointIFInvocationHandler.java:174) at com.sun.xml.ws.client.EndpointIFInvocationHandler.invoke(EndpointIFInvocationHandler.java:108) at $Proxy76.getAdslPortStatus(Unknown Source) ... 33 more
Anybody can give me a clue? Thank you very much.
Message was edited by:
Flashget
Message was edited by:
Flashget

i to have the same errors which u got sir, if u find any answer please send it to me
[email protected]
regards
hari krishna

Java.lang.reflect.InvocationTargetException

Hi,
I am new to EJB. i've developed my first EJB Program using Netbeans.
Here are my classes :
package ejb;
import javax.ejb.Stateless;
@Stateless(mappedName="Bean30")
public class Bean30Bean implements Bean30Remote
public String getResult()
return "This is EJB 3.0 Bean";
Remote Interface :
package ejb;
import javax.ejb.Remote;
@Remote
public interface Bean30Remote {
String getResult();
Calling EJB :
InitialContext ctx = new InitialContext();
Bean30Remote br = (Bean30Remote) ctx.lookup("Bean30#ejb.Bean30Remote");
System.err.println("EJB message is: " + br.getResult());
While lookup, it is throwing me an exception :
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.glassfish.appclient.client.acc.AppClientContainer.launch(AppClientContainer.java:438)
at org.glassfish.appclient.client.AppClientFacade.main(AppClientFacade.java:165)
Caused by: javax.naming.NamingException: Lookup failed for 'Bean30#ejb.Bean30Remote2' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.url.pkgs=com.sun.enterprise.naming, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl} [Root exception is javax.naming.NamingException: ejb ref resolution error for remote business interfaceejb.Bean30Remote2 [Root exception is java.lang.ClassNotFoundException: ejb.Bean30Remote2]]
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:518)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:455)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at applicationclientfortest.Main.main(Main.java:27)
... 6 more
Caused by: javax.naming.NamingException: ejb ref resolution error for remote business interfaceejb.Bean30Remote2 [Root exception is java.lang.ClassNotFoundException: ejb.Bean30Remote2]
at com.sun.ejb.EJBUtils.lookupRemote30BusinessObject(EJBUtils.java:433)
at com.sun.ejb.containers.RemoteBusinessObjectFactory.getObjectInstance(RemoteBusinessObjectFactory.java:75)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
at com.sun.enterprise.naming.impl.SerialContext.getObjectInstance(SerialContext.java:556)
at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:514)
... 9 more
Caused by: java.lang.ClassNotFoundException: ejb.Bean30Remote2
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at org.glassfish.appclient.client.acc.ACCClassLoader.findClass(ACCClassLoader.java:212)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at com.sun.ejb.EJBUtils.getBusinessIntfClassLoader(EJBUtils.java:687)
at com.sun.ejb.EJBUtils.loadGeneratedRemoteBusinessClasses(EJBUtils.java:462)
at com.sun.ejb.EJBUtils.lookupRemote30BusinessObject(EJBUtils.java:413)
... 13 more
I've checked on the GlassFish. It has been deployed successfully with name "EJBModule30".
Any comments will be greatly appreciated. Please let me know if i'm doing something wrong.

r035198x wrote:
>
That shouldn't be necessary in a JEE environment. Proper packaging is all you need to do and the container takes care of the rest.The remote client may not be in a container....
**puts on a brown paper bag**
In any case the name inconsistency is a nice catch, but when I check the logging:
ejb ref resolution error for remote business interfaceejb.Bean30Remote2 [Root exception is java.lang.ClassNotFoundException: ejb.Bean30Remote2]]I wonder if Glassfish actually contains a logging mistake where it doesn't print a space between the log text and the interface, or that someone has been doing some manual editing before posting it...

Help:java.lang.reflect

Dear every one,
I have a class as following:
public class classA implements interfaceA{.....}
,but when I use the class.forName() method to open the classA as following:
Class c=Class.forName("classA");
it generate java.lang.NoClassDefFoundError, could you please tell me why, and
how can solve the problem. Thanks a lot.
Yours Leon

Thank you very much for your reply, but it is not the point , at least not what i want, assumed the 3 classes are following:
//class1: classA.class
public class classA{
     public static void main(String args[]){System.out.println("OK");}
     public void m1(){}
     public String m2(String mst){System.out.println(mst);return mst;}
//class2 : classB.class
public class classB implement Interface1{....}
//class3: atest.class
import java.lang.reflect.*;
public class atest{
public static void main(String args[]){
     try{
     Class a=Class.forName("classA");//it works
     Class a1=Class.forName("classB");//doesn't work
     System.out.println(a.getName());
     System.out.println(a1.getName());
     }catch(Exception e){}
}

HELP!!! java.lang.ClassFormatError: (Truncated class file)

Hello all,
I'm writing a ClassLoader and the funniest things are happening. If I load a compiled class for the first time after compilation everything is ok. Once I change the class and recompile it, it starts putting out java.lang.ClassFormatError: (Truncated class file). If I alter the changes back to normal and recompile. It works again. Is there some sort of buffer which keeps the once loaded class in memory, even after rebooting?
Please help, I'm at a loss
Gideon

hi dmbdmb,
I got following error when try to run a java code in JBoss.
15:39:56,696 ERROR [LogInterceptor] Unexpected Error:
java.lang.ClassFormatError: Thilina (Truncated class file)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.lang.ClassLoader.defineClass(ClassLoader.java:448)
at com.sun.tools.javac.v8.StringCompiler$Loader.findClass(StringCompiler
.java:63)
at com.sun.tools.javac.v8.StringCompiler.executeMethodWithReturnType(Str
ingCompiler.java:120)
at cc.aot.qVoice.domain.ejb.qVoiceManager.qVoiceManagerEJB.getVxmlString
(qVoiceManagerEJB.java:125)
I use JBoss 3.0.6 and sdk 1.4. In my program, classes are create and load on the fly. Then using Reflection API I called some
methods in the dynamically created class(this class not
write into a file and it is taken as a String variable).
I refferd this url as a guid to write class loader and compiler.(actually same thing i copied
from there and change it's name Pmat1 to StringCompiler)
http://forum.java.sun.com/thread.jsp?thread=347467&forum=4&message=1439418
When I run this as a normal application, it is work well. Then I try to run it in a jboss and it will give the above error.
In here I Wote some EJBs and struts also and i called the methodds in the StringCompiler(Pamat1) class in a EJB. Thilina is
the name of the dynamically created calss and StringCompiler is the class that includes the class loader and compiler methods
as in the above url. qVoiceManagerEJB has a getvxmlString method. Whithin this method
i called required the methods in the String compiler.
Can u some body help me. Thanx in advanced for any help.
anjithalb

Java.lang.reflect.InnvokationTargetException

Hello everybody,
I am getting following error logs while executing my swing application.
java.lang.reflect.InnvokationTargetException
at sun.reflect.delegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Mehod:java:324)
I am trying to call some class's method using reflection principle.
All values of acces modifier, return type, method name, args are correct at run time. I don't understand why i am getting this error.
Can anybody please help me.
Thanks and regards
Girish Varde

I would say that this sentence is rather confusing since you get the exception nonetheless.The sentence means when I am in debug mode and check value of the actual class whose method is called, the class value is correct. It's not that the class whose method I am calling does not exist.
First I give the reference error log which you can use to locate at what point the exception is thrown.
java.lang.reflect.InvocationTargetException
     at sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.apsiva.commframework.server.Communicator.processRequest(Communicator.java:45)
     at com.apsiva.commframework.server.CommunicationServlet.processRequest(CommunicationServlet.java:92)
     at com.apsiva.commframework.server.CommunicationServlet.doPost(CommunicationServlet.java:30)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
public class Communicator implements java.io.Serializable{
     public static final String DECENTRALIZED_MODE = "decentralizedMode";
     //applicationMode could be localMode or distributedMode or decentralizedMode
     public static final String DISTRIBUTED_MODE = "distributedMode";
     public static final String LOCAL_MODE = "localMode";
      * Communicator constructor comment.
     public Communicator() {
          super();
public Object processRequest(Request request) throws java.lang.Exception {
     Object obj = null;
     try
          String str = request.getActionCode();
          System.out.println("Printing str : " + str);
          if (str == null)
               return null;
          Class cls = ActionCodes.class;
          Field f = cls.getField(str);
          String actionClassName = (String)f.get(null);
          if (actionClassName == null)
               return null;
          cls = Class.forName(actionClassName);
          Object actionObj = cls.newInstance();
          System.out.println("Printing actionClassName : " + actionClassName);
          Method mthd = cls.getMethod("processRequest", new Class[]{Request.class});
          System.out.println("Printing mthd : " + mthd);
          obj = mthd.invoke(actionObj, new Object[]{request});   // line 45
          return obj;
     } catch (Exception e)
          e.printStackTrace();
          throw e;
public class CommunicationServlet extends HttpServlet{
     private Communicator communicator = null;
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
     doPost(req,res);
     }//end of doGet
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
     res.setContentType("text/html");
     Response response = null;
     OutputStream o = null;
     try{
          Request request = getSerializedRequest(req);
          //logString("The seriliazed object is: " + request.toString());
          response = (Response)processRequest(request);
          o = res.getOutputStream();
          sendSerializedResponse(o, response);
     }catch(Exception e){
          e.printStackTrace();
          try{
               if(o != null)sendSerializedResponse(o, e);
               else {
                    o = res.getOutputStream();
                    sendSerializedResponse(o, e);
          }catch(Exception ignor){
               ignor.printStackTrace();
     }//end of doPost
public Communicator getCommunicator() {
     return new Communicator();
private HashMap getParams(HttpServletRequest req){
     Enumeration enu = req.getParameterNames();
     HashMap map = new HashMap();
     while(enu.hasMoreElements()){
          String name = (String)enu.nextElement();
          String value = req.getParameter(name);
          if(name != null && !name.equals("") && value != null){
               map.put(name, value);
          }//end of if
     }//end while
     return map;
     }//end of getParams
private Request getSerializedRequest(HttpServletRequest req) throws Exception{
     log("start getSerializedRequest()");
     Request request = null;
     try{
          ObjectInputStream oIn = new ObjectInputStream(req.getInputStream());
          Object o = oIn.readObject();
          oIn.close();
          request = (Request)o;
          return request;
     }catch(Exception e){
          logString("CommunicationServlet cannot receive serialized object.");
          e.printStackTrace();
          throw e;
}//end of getRequest
private void logString(Object s){
     if(s != null) System.out.println(s);
     else System.out.println("Received null object.");
public Object processRequest(Request request) throws Exception {
     return this.getCommunicator().processRequest(request);        // line 92
private void sendSerializedResponse(OutputStream o, Object resp) throws Exception{
     if(o != null){
          ObjectOutputStream oOut = new ObjectOutputStream(o);
          oOut.writeObject(resp);
          oOut.flush();
          oOut.close();
public void setCommunicator(Communicator newCommunicator) {
     communicator = newCommunicator;
}

Webs ervices exception: java.lang.reflect.InvocationTargetException

hi guys!
i created web services using "Eclipse Ganymede" and i created a class for acessing bussiness objects of another project. so i included all jars into web services project. While i am testing my web services i am getting an exceprion as
exception: java.lang.reflect.InvocationTargetException So please help me to resolve this problem. i think while ruunig my webservices java could n't able to read the execute the jar files.if its so please suggest what to do?
Regards
vm

When you run your code standalone there is no security manager so you won't get a PrivilegedActionException. Install a SecurityManager and examine the complete stack trace to see what is going on.

Using java.lang.reflect.Proxy class

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