Fix invalid Java Enum generation

Author: beikov

modules/openapi-generator/src/main/resources/Java/modelInnerEnum.mustache

@@ -23,7 +23,7 @@
     {{#withXml}}
     @XmlEnumValue({{#isInteger}}"{{/isInteger}}{{#isDouble}}"{{/isDouble}}{{#isLong}}"{{/isLong}}{{#isFloat}}"{{/isFloat}}{{{value}}}{{#isInteger}}"{{/isInteger}}{{#isDouble}}"{{/isDouble}}{{#isLong}}"{{/isLong}}{{#isFloat}}"{{/isFloat}})
     {{/withXml}}
-    {{{name}}}({{{value}}}){{^-last}},
+    {{{name}}}({{^isUri}}{{dataType}}.valueOf({{/isUri}}{{{value}}}{{^isUri}}){{/isUri}}){{^-last}},
     {{/-last}}{{#-last}};{{/-last}}
       {{/enumVars}}
     {{/allowableValues}}