(WIP) Work towards #4907 on 3.x: reduce introspection for "java.*" classes (and maybe others too)

src/main/java/tools/jackson/databind/BeanDescription.java

@@ -360,10 +360,11 @@ public AnnotatedClass getClassInfo() {
         @Override
         public BeanDescription get() {
             if (_beanDesc == null) {
+//if (true) throw new Error("Gotcha!");
                 // To test without caching, uncomment:
-                //return _construct(_type, getClassInfo());
+                return _construct(_type, getClassInfo());
 
-                _beanDesc = _construct(_type, getClassInfo());
+                //_beanDesc = _construct(_type, getClassInfo());
             }
             return _beanDesc;
         }

src/main/java/tools/jackson/databind/DatabindContext.java

@@ -322,13 +322,13 @@ public BeanDescription.Supplier lazyIntrospectBeanDescription(JavaType type) {
          return new BeanDescription.LazySupplier(getConfig(), type) {
              @Override
              protected BeanDescription _construct(JavaType forType, AnnotatedClass ac) {
-// System.out.println("lazyIntrospectBeanDescription.beanDesc("+forType+")");
+ System.out.println("lazyIntrospectBeanDescription.beanDesc("+forType+")");
                  return introspectBeanDescription(forType);
              }
 
              @Override
              protected AnnotatedClass _introspect(JavaType forType) {
-// System.out.println("lazyIntrospectBeanDescription.annotatedClass("+forType+")");
+ System.out.println("lazyIntrospectBeanDescription.annotatedClass("+forType+")");
                  return introspectClassAnnotations(forType);
              }
          };

src/main/java/tools/jackson/databind/introspect/POJOPropertiesCollector.java

@@ -379,7 +379,7 @@ public JsonFormat.Value getFormatOverrides() {
      */
     protected void collectAll()
     {
-//System.out.println(" PojoPropsCollector.collectAll() for  "+_classDef.getRawType().getName()); 
+System.out.println(" PojoPropsCollector.collectAll() for  "+_classDef.getRawType().getName()); 
         _potentialCreators = new PotentialCreators();
 
         // First: gather basic accessors

src/test/java/tools/jackson/databind/misc/Reflection4907Jackson3Test.java

@@ -0,0 +1,103 @@
+package tools.jackson.databind.misc;
+
+import org.junit.jupiter.api.Test;
+
+import tools.jackson.databind.*;
+import tools.jackson.databind.testutil.DatabindTestUtil;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class Reflection4907Jackson3Test extends DatabindTestUtil
+{
+    static class SqlDatePojo {
+        public String name;
+        public java.sql.Date date;
+        public List<String> tags;
+
+        public SqlDatePojo() {
+        }
+
+        public SqlDatePojo(String name, java.sql.Date date, String... tags) {
+            this.name = name;
+            this.date = date;
+            this.tags = Arrays.asList(tags);
+        }
+
+        public SqlDatePojo(java.sql.Date date) {
+            this.date = date;
+        }
+
+        public java.sql.Date getDate() {
+            return date;
+        }
+
+        public void setDate(java.sql.Date date) {
+            this.date = date;
+        }
+
+        public List<String> getTags() {
+            return tags;
+        }
+    }
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
+    @Test
+    public void test4907ReadPojo() throws Exception {
+System.err.println("<testReadPojo>");
+        SqlDatePojo pojo = MAPPER.readValue(a2q("{'date':'2000-01-01', 'name':'foo'}"),
+                SqlDatePojo.class);
+System.err.println("</testReadPojo>");
+        assertNotNull(pojo);
+    }
+
+    @Test
+    public void test4907WritePojo() throws Exception {
+System.err.println("<testWritePojo>");
+         String json = MAPPER.writeValueAsString(new SqlDatePojo("foobar",
+                 java.sql.Date.valueOf("2000-01-01"), "abc", "def"));
+ System.err.println("</testWritePojo>");
+         assertNotNull(json);
+    }
+    /*
+
+    @Test
+    public void test4907ReadTags() throws Exception {
+System.err.println("<testReadTags>");
+        List<?> tags = MAPPER.readValue(a2q("['abc', 'def']"),
+                List.class);
+System.err.println("</testReadTags>");
+        assertNotNull(tags);
+    }
+
+    @Test
+    public void test4907WriteTags() throws Exception {
+System.err.println("<testWriteTags>");
+         String json = MAPPER.writeValueAsString(Arrays.asList("abc", "def"));
+ System.err.println("</testWriteTags>");
+         assertNotNull(json);
+    }
+    */
+
+    /*
+    @Test
+    public void test4907ReadDate() throws Exception {
+System.err.println("<testReadDate>");
+        java.sql.Date date = MAPPER.readValue(a2q("'2000-01-01'"),
+                java.sql.Date.class);
+System.err.println("</testReadDate>");
+        assertNotNull(date);
+    }
+
+    @Test
+    public void test4907WriteDate() throws Exception {
+System.err.println("<testWriteDate>");
+         String json = MAPPER.writeValueAsString(java.sql.Date.valueOf("2000-01-01"));
+ System.err.println("</testWriteDate>");
+         assertNotNull(json);
+    }
+    */
+}