Custom datasource class in JBoss AS7

In my project there is custom datasource class, which is used to call oracle store procedures and queries. I have deployed the module jar file contains data source class in JBoss module folder, and configure datasource in standalone.xml as mentioned below:

   <driver name="oracleDriver" module="com.oracle">
      <driver-class>oracle.jdbc.OracleDriver</driver-class>
      <xa-datasource-class>com.sampleApp.api.CustomDataSourceImpl</xa-datasource-class>
   </driver>

but when i try to run the application, i am getting below exception:

    Caused by: java.lang.IllegalArgumentException: Can not set com.sampleApp.api.CustomDataSourceImpl field com.sampleApp.api.ConnectorManagementBean.dataSource to org.jboss.jca.adapters.jdbc.WrapperDataSource
        at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164) [rt.jar:1.7.0_80]
        at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168) [rt.jar:1.7.0_80]
        at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81) [rt.jar:1.7.0_80]
        at java.lang.reflect.Field.set(Field.java:741) [rt.jar:1.7.0_80]
        at org.jboss.as.ee.component.ManagedReferenceFieldInjectionInterceptorFactory$ManagedReferenceFieldInjectionInterceptor.processInvocation(ManagedReferen
ceFieldInjectionInterceptorFactory.java:108) [jboss-as-ee-7.4.0.Final-redhat-19.jar:7.4.0.Final-redhat-19]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.as.ee.component.ComponentInstantiatorInterceptor.processInvocation(ComponentInstantiatorInterceptor.java:76) [jboss-as-ee-7.4.0.Final-redha
t-19.jar:7.4.0.Final-redhat-19]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) [jboss-as-ee-7.4.0.Final-redhat-19.jar:7
.4.0.Final-redhat-19]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [jboss-as
-ejb3-7.4.0.Final-redhat-19.jar:7.4.0.Final-redhat-19]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:70) [jboss-invocation-1.1.2.Final-redhat-1.ja
r:1.1.2.Final-redhat-1]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
        at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1
]
        at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:162) [jboss-as-ee-7.4.0.Final-redhat-19.jar:7.4.0.Final-redha
t-19]

What is missing in above steps due to that i am getting wrappedDataSource instead of CustomDataSourceImpl?