Bad reflection usage leads to race condition

Exception in thread "Thread-33" java.lang.reflect.UndeclaredThrowableException
at $Proxy142.addToLinkedList(Unknown Source)
at com.sun.ts.tests.ejb30.lite.singleton.concurrency.common.ClientBase$1.run(ClientBase.java:128)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IllegalAccessException: Class org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor can not access a member of class com.sun.ts.tests.ejb30.lite.singleton.common.SingletonInterceptorBase with modifiers "private"
at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65)
at java.lang.reflect.Method.invoke(Method.java:588)
at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:83)
at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:70)