getting "SecurityException" while using JAXB generated Java classes from different project

Hi All,
Again help needed :)

I am getting following exception while unmarshalling.
---- Stack Trace Starts ----
java.lang.SecurityException: class "javax.xml.bind.JAXBElement"'s
signer information does not match signer information of other classes
in the same package
at java.lang.ClassLoader.checkCerts(ClassLoader.java:775)
    at java.lang.ClassLoader.preDefineClass(ClassLoader.java:487)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:614)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:
124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    at com.yashbinary.abc.JaxbImpl.main(JaxbImpl.java:46)
---- Stack Trace Ends ----
After analyzing stack trace its seems problem occur while trying to
access classes from different project. But if its a requirement that
we need to separte the "generate JAXB Java classes from an XML schema"
with those class which are used to traverse the xmls.

I am using to Java project "JAXBDemo" and "JAXB-USE"
1. In first project (JAXBDemo) I Generate JAXB Java classes from an
XML schema.
2. In second project (JAXB-USE) I am trying to read
"booking_detail.xml" using JAXB java classes (generated file from
first project).

---- build.xml (to generate jaxb classes) ----
<project name="JAXBDemo" default="main" basedir=".">
    <taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">
        <classpath>
    <fileset dir="C:\lib\XML_API\JAXB_Libs" includes="*.jar" />
    <fileset dir="C:\jwsdp1.4\jwsdp-shared\lib" includes="*.jar" />
    <pathelement location="classes"/>
         </classpath>
     </taskdef>
     <target name="generate">
          <xjc target="src" removeOldOutput="yes"
package="com.yashbinary.abc">
                <schema dir="C:\Workspace\JAXBDemo\xsd"
includes="booking_detail.xsd"/>
          </xjc>
      </target>
      <target name="main" depends="generate"></target>
</project>

---- Java Code Starts-----

package com.yashbinary.abc;
public class JaxbImpl {
public static void main(String[] args) {
   JAXBContext jaxbContext;
   try {
       jaxbContext = JAXBContext.newInstance("com.yashbinary.abc");
       Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
       JAXBElement<CourseBooking> bookingElement =
(JAXBElement<CourseBooking>)
unmarshaller.unmarshal(new File("C:/Workspace/JAXB-USE/xml/
booking_detail.xml"));
   }catch( JAXBException je ) {
         je.printStackTrace();
   }
}

------- Java Code Ends --------

Thank U in Advance...

regards,
Amit Jain