我创建了一个自定义处理器，以将AWS Encryption SDK用作NiFi版本1.7.1中的单独处理器
我已经实现了具有必需属性的Abstract类以及具有getSupportedPropertyDescriptors和onTrigger功能的createClient函数和处理器主类。
但是，当我尝试运行处理器时，出现以下错误：-
2018-08-15 23:15:39,732 ERROR [Timer-Driven Process Thread-5] o.a.n.p.a.encryption.EncryptorProcessor EncryptorProcessor[id=3eaf70a8-0165-1000-a4d1-6cfa42125382] Failed to properly initialize Processor. If still scheduled to run, NiFi will attempt to initialize and run the Processor again after the 'Administrative Yield Duration' has elapsed. Failure is due to java.lang.reflect.InvocationTargetException: java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:142)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:130)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:75)
at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotation(ReflectionUtils.java:52)
at org.apache.nifi.controller.StandardProcessorNode.lambda$initiateStart$4(StandardProcessorNode.java:1499)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException: null
at org.apache.nifi.processors.aws.AbstractAWSProcessor.createConfiguration(AbstractAWSProcessor.java:221)
at org.apache.nifi.processors.aws.AbstractAWSProcessor.onScheduled(AbstractAWSProcessor.java:268)
at org.apache.nifi.processors.aws.AbstractAWSCredentialsProviderProcessor.onScheduled(AbstractAWSCredentialsProviderProcessor.java:65)
... 15 common frames omitted
版本：- AWS Encryption SDK版本-1.3.1 Nifi版本-1.7.1 有弹性的城堡依赖项版本-1.59
CodeBase大纲：
AbstractProcessor：
ProcessorClass：
任何帮助将不胜感激！