pvillard31 commented on pull request #4846:
URL: https://github.com/apache/nifi/pull/4846#issuecomment-786156302
Built the PR and gave it a try. When trying to import a flow (json file)
that I just exported from somewhere else on the canvas by right clicking on a
process group / download flow definition, I always got the below stack trace:
````
2021-02-25 23:42:36,617 ERROR [NiFi Web Server-234]
o.a.nifi.web.api.config.ThrowableMapper An unexpected error has occurred:
java.lang.NullPointerException. Returning Internal Server Error response.
java.lang.NullPointerException: null
at
org.apache.nifi.web.api.ProcessGroupResource.lambda$uploadProcessGroup$106(ProcessGroupResource.java:4373)
at
org.apache.nifi.web.api.ApplicationResource.withWriteLock(ApplicationResource.java:719)
at
org.apache.nifi.web.api.ProcessGroupResource.uploadProcessGroup(ProcessGroupResource.java:4328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:76)
at
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:148)
at
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:191)
at
org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:200)
at
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:103)
at
org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:493)
at
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:415)
at
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:104)
at
org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:277)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:272)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:268)
at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
at org.glassfish.jersey.internal.Errors.process(Errors.java:268)
at
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:289)
at
org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:256)
at
org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:703)
at
org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:416)
at
org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:370)
at
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389)
at
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342)
at
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229)
at
org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1452)
at
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:791)
at
org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1626)
at
org.apache.nifi.web.filter.RequestLogger.doFilter(RequestLogger.java:66)
at
org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at
org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
...
````
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