8309881: Qualified name of a type element depends on its origin (source vs class)

Reviewed-by: darcy, jlahoda

src/jdk.compiler/share/classes/com/sun/tools/javac/code/Type.java

@@ -1120,6 +1120,7 @@ public abstract class Type extends AnnoConstruct implements TypeMirror, PoolCons
                         s += String.valueOf(sym.hashCode());
                     return s;
                 } else if (longform) {
+                    sym.apiComplete();
                     return sym.getQualifiedName().toString();
                 } else {
                     return sym.name.toString();

test/langtools/tools/javac/TypeToString.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8309881
+ * @library /tools/javac/lib
+ * @modules java.compiler
+ *          jdk.compiler
+ * @build JavacTestingAbstractProcessor TypeToString
+ * @compile -cp . -processor TypeToString -proc:only TypeToString.java
+ * @compile/process -cp . -processor TypeToString -proc:only Test
+ */
+import java.lang.Runtime.Version;
+import java.util.*;
+import javax.annotation.processing.*;
+import javax.lang.model.element.*;
+import javax.lang.model.util.*;
+
+@SupportedAnnotationTypes("*")
+public class TypeToString extends JavacTestingAbstractProcessor {
+
+    public boolean process(Set<? extends TypeElement> typeElementSet,RoundEnvironment renv) {
+        if (renv.processingOver()) {
+            TypeElement testClass = processingEnv.getElementUtils().getTypeElement("Test");
+            ExecutableElement method = ElementFilter.methodsIn(testClass.getEnclosedElements())
+                                                    .iterator()
+                                                    .next();
+            String expectedTypeToString = "java.lang.Runtime.Version";
+            String actualToString = method.getReturnType().toString();
+
+            if (!Objects.equals(expectedTypeToString, actualToString)) {
+                throw new AssertionError("Unexpected toString value. " +
+                                         "Expected: " + expectedTypeToString + ", " +
+                                         "but got: " + actualToString);
+            }
+
+            actualToString = method.getParameters().get(0).asType().toString();
+
+            if (!Objects.equals(expectedTypeToString, actualToString)) {
+                throw new AssertionError("Unexpected toString value. " +
+                                         "Expected: " + expectedTypeToString + ", " +
+                                         "but got: " + actualToString);
+            }
+        }
+        return false;
+    }
+}
+
+class Test {
+    public Version get(Version v) {
+        return null;
+    }
+}