[jira] [Created] (IGNITE-4865) Non-informative error message on using GridClientOptimizedMarshaller with unknown task classes

["Alexandr Kuramshin (JIRA)" <ji...@apache.org>]

Alexandr Kuramshin created IGNITE-4865:
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             Summary: Non-informative error message on using GridClientOptimizedMarshaller with unknown task classes
                 Key: IGNITE-4865
                 URL: https://issues.apache.org/jira/browse/IGNITE-4865
             Project: Ignite
          Issue Type: Improvement
          Components: rest
    Affects Versions: 2.0
            Reporter: Alexandr Kuramshin
            Assignee: Alexandr Kuramshin


Upon {{GridClientCompute.execute()}} I get non-informative error if a task class is not present in {{classnames.properties}}. It occurs when {{GridClient}} was configured to use {{GridClientOptimizedMarshaller}}.

{noformat}
Closing NIO session because of unhandled exception [cls=class o.a.i.i.util.nio.GridNioException, msg=class o.a.i.IgniteCheckedException: Failed to deserialize object with given class loader: null]
{noformat}

There is two problems:
* Actual problem was hidden
{noformat}
Caused by: java.lang.UnsupportedOperationException
    at org.apache.ignite.internal.client.marshaller.optimized.GridClientOptimizedMarshaller$ClientMarshallerContext.className(GridClientOptimizedMarshaller.java:137)
    at org.apache.ignite.internal.MarshallerContextAdapter.getClass(MarshallerContextAdapter.java:174)
    at org.apache.ignite.marshaller.optimized.OptimizedMarshallerUtils.classDescriptor(OptimizedMarshallerUtils.java:266)
    at org.apache.ignite.marshaller.optimized.OptimizedObjectInputStream.readObjectOverride(OptimizedObjectInputStream.java:318)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:367)
{noformat}
* Even reading the cause we don't understand what is wrong

What to do:
* Log stacktrace every time
* Throw UnsupportedOperationException with informative message.



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