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I am currently trying to deploy a GWT web app to a tomcat instance, and the program isn't running correctly. On close examination of the tomcat logs, it looks like Tomcat is running into a AccessDeniedException.

SEVERE: Exception while dispatching incoming RPC call com.google.gwt.user.client.rpc.SerializationException: Type 'java.nio.file.AccessDeniedException' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = java.nio.file.AccessDeniedException: /luceneIndex

I am perplexed however, as the folder should be easily accessible to tomcat. 

drwxrwxrwx 4 tomcat tomcat 4096 Mar 14 20:32 SearchTest
-rwxrwxrwx 1 tomcat tomcat  602 Mar 12 20:14 SearchTest.css
-rwxrwxrwx 1 tomcat tomcat 3038 Mar 13 23:13 SearchTest.html
drwxrwxrwx 5 tomcat tomcat 4096 Mar 14 20:24 WEB-INF
-rwxrwxrwx 1 tomcat tomcat 1082 Mar 12 20:14 favicon.ico
drwxrwxrwx 2 tomcat tomcat 4096 Mar 14 20:24 luceneFiles
drwxrwxrwx 2 tomcat tomcat 4096 Mar 14 20:24 luceneIndex

What could be causing this issue?

Sihan Zheng
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    You may wish to have a look at [GWT - RPC SerializationException](http://stackoverflow.com/questions/9534484/gwt-rpc-serializationexception). A google search on _com.google.gwt.user.client.rpc.serializationexception type was not included_ finds quite a few others that may be of assistance. – MikeT Mar 14 '16 at 19:35

1 Answers1

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Are you using 'java.nio.file.AccessDeniedException' in your client-side code? The GWT compiler translates all the client-side Java code into JavaScript. Since not all Java functionalities are available in a web browser, GWT only supports a subset of the Java runtime library.

You can take a look at these two page JRE Compatablity and JRE Emulation.

As far as I can tell, none of the classes within java.nio package are emulated. That might be the reason you got your error.

dydigging
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