Fix handling of reference types

pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/errorprone/ConstructorCallsOverridableMethodRule.java

@@ -1048,7 +1048,12 @@ public final class ConstructorCallsOverridableMethodRule extends AbstractJavaRul
                 if (type.getChild(0) instanceof ASTPrimitiveType) {
                     parameterTypes.add(type.getChild(0).getImage());
                 } else if (type.getChild(0) instanceof ASTReferenceType) {
-                    parameterTypes.add("ref");
+                    JavaTypeDefinition typeDefinition = type.getTypeDefinition();
+                    if (typeDefinition != null) {
+                        parameterTypes.add(typeDefinition.getType().getName());
+                    } else {
+                        parameterTypes.add("ref");
+                    }
                 } else {
                     parameterTypes.add("<unknown>");
                 }

pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/errorprone/xml/ConstructorCallsOverridableMethod.xml

@@ -322,8 +322,8 @@ import java.lang.annotation.*;
     </test-code>
     <test-code>
         <description>[java] ConstructorCallsOverridableMethod should consider method calls with var access #4099</description>
-        <expected-problems>2</expected-problems>
-        <expected-linenumbers>4,11</expected-linenumbers>
+        <expected-problems>3</expected-problems>
+        <expected-linenumbers>4,11,18</expected-linenumbers>
         <code><![CDATA[
 class Foo1 {
   final boolean tag = true;
@@ -340,6 +340,12 @@ class Foo2 {
   public void bar(boolean b) {}
 }
 
+class Foo3 {
+  public Foo3(String arg) {
+    bar(arg); // should report a warning at this line
+  }
+  public void bar(String s) {}
+}
 ]]></code>
     </test-code>
 </test-data>