Java2Swift: Don't use Self in an invariant position in enum convenience init

Author: DougGregor

Sources/Java2SwiftLib/JavaClassTranslator.swift

@@ -584,7 +584,7 @@ extension JavaClassTranslator {
       } else {
         try! JavaVirtualMachine.shared().environment()
       }
-      let classObj = try! JavaClass<Self>(environment: _environment)
+      let classObj = try! JavaClass<\(raw: swiftInnermostTypeName)>(environment: _environment)
       switch enumValue {
     \(raw: enumConstants.map {
       return """

Tests/Java2SwiftTests/Java2SwiftTests.swift

@@ -344,6 +344,9 @@ class Java2SwiftTests: XCTestCase {
             }
         """,
         "public convenience init(_ enumValue: MonthCases, environment: JNIEnvironment? = nil) {",
+        """
+        let classObj = try! JavaClass<Month>(environment: _environment)
+        """,
         """
               case .APRIL:
                 if let APRIL = classObj.APRIL {