gwt compilation issues while upgrading from GWT 2.7.0 to GWT 2.9.0

Hi Team,

Currently we are using SmartGWT 4.1 LGPL, GWT 2.7.0 & Java 1.8 with below supporting libraries

gin-2.1.2.jar

gwt-presenter-1.1.1.jar

gwtexporter-2.4.0.jar

guice-3.0.jar

javax.inject.jar

guice-assistedinject-3.0.jar

aopalliance.jar

gwtx-1.5.2.jar

While just upgrading to GWT 2.9.0 and doing gwt compile, i am getting below error,

[ERROR] Unable to find class java/lang/Enum

     [java]          Resolving method valueOf

     [java]             [ERROR] Unable to resolve type java/lang/String of argument arg0

It is also having too many occurrences of below error,

[ERROR] Unable to find class java/lang/Object

Any suggestion about how to resolve it, or if you need more details ?

Thanks

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