java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.util.HashMap.putAll(HashMap.java:498)
at oracle.iam.notification.impl.NotificationServiceImpl.getMessageContent(NotificationServiceImpl.java:324)
at oracle.iam.notification.impl.NotificationServiceImpl.notify(NotificationServiceImpl.java:537)
at oracle.iam.notification.impl.NotificationServiceImpl.notify(NotificationServiceImpl.java:271)
at sun.reflect.GeneratedMethodAccessor11126.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at oracle.iam.platform.utils.DMSMethodInterceptor.invoke(DMSMethodInterceptor.java:25)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at undefined.$Proxy479.notify(Unknown Source)
at oracle.iam.notification.api.NotificationServiceEJB.notifyx(Unknown Source)
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)

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