Fix #131

afterburner/src/main/java/com/fasterxml/jackson/module/afterburner/util/MyClassLoader.java

@@ -48,17 +48,20 @@ public static boolean canAddClassInPackageOf(Class<?> cls)
                 return false;
             }
             String pname = beanPackage.getName();
-            /* 14-Aug-2014, tatu: java.* we do not want to touch, but
-             *    javax is bit trickier. For now let's 
-             */
+            // 14-Aug-2014, tatu: java.* we do not want to touch, but
+            //    javax is bit trickier.
             if (pname.startsWith("java.")
-                    || pname.startsWith("javax.security.")) {
+                    || pname.startsWith("javax.security.")
+                    // 23-Apr-2021, tatu: [modules-base#131] "sun.misc"
+                    //    problematic too
+                    || pname.startsWith("sun.misc")
+            ) {
                 return false;
             }
         }
         return true;
     }
-    
+
     /**
      * @param className Interface or abstract class that class to load should extend or 
      *   implement

afterburner/src/test/java/com/fasterxml/jackson/module/afterburner/misc/PreventJDKTypeAccessTest.java

@@ -0,0 +1,24 @@
+package com.fasterxml.jackson.module.afterburner.misc;
+
+import java.util.Map;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.module.afterburner.AfterburnerTestBase;
+
+public class PreventJDKTypeAccessTest extends AfterburnerTestBase
+{
+    private final ObjectMapper MAPPER = newObjectMapper();
+    private final ObjectMapper VANILLA_MAPPER = newVanillaJSONMapper();
+
+    public void testJDKThreadroundTrip() throws Exception
+    {
+        final Object input = Thread.currentThread();
+        final String json1 = VANILLA_MAPPER.writeValueAsString(input);
+        final String json2 = MAPPER.writeValueAsString(input);
+
+        Map<?,?> map1 = VANILLA_MAPPER.readValue(json1, Map.class);
+        Map<?,?> map2 = MAPPER.readValue(json2, Map.class);
+
+        assertEquals(map1.keySet(), map2.keySet());
+    }
+}

blackbird/src/main/java/com/fasterxml/jackson/module/blackbird/BlackbirdModule.java

@@ -23,7 +23,13 @@ public BlackbirdModule(Function<Class<?>, MethodHandles.Lookup> lookups) {
     }
 
     public BlackbirdModule(Supplier<MethodHandles.Lookup> lookup) {
-        this(c -> c.getName().startsWith("java") ? null : lookup.get());
+        this(c -> {
+            final String className = c.getName();
+            return (className.startsWith("java.")
+                    // 23-Apr-2021, tatu: [modules-base#131] "sun.misc" problematic too
+                    || className.startsWith("sun.misc."))
+                ? null : lookup.get();
+        });
     }
 
     @Override

blackbird/src/test/java/com/fasterxml/jackson/module/blackbird/misc/PreventJDKTypeAccessTest.java

@@ -0,0 +1,24 @@
+package com.fasterxml.jackson.module.blackbird.misc;
+
+import java.util.Map;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.module.blackbird.BlackbirdTestBase;
+
+public class PreventJDKTypeAccessTest extends BlackbirdTestBase
+{
+    private final ObjectMapper MAPPER = newObjectMapper();
+    private final ObjectMapper VANILLA_MAPPER = newVanillaJSONMapper();
+
+    public void testJDKThreadroundTrip() throws Exception
+    {
+        final Object input = Thread.currentThread();
+        final String json1 = VANILLA_MAPPER.writeValueAsString(input);
+        final String json2 = MAPPER.writeValueAsString(input);
+
+        Map<?,?> map1 = VANILLA_MAPPER.readValue(json1, Map.class);
+        Map<?,?> map2 = MAPPER.readValue(json2, Map.class);
+
+        assertEquals(map1.keySet(), map2.keySet());
+    }
+}

release-notes/VERSION-2.x

@@ -12,6 +12,12 @@ Modules:
 === Releases ===
 ------------------------------------------------------------------------
 
+2.12.4 (not yet released
+
+#131: Failing to serialize `Thread` returned by `Thread.currentThread()` when Afterburner
+   or Blackbird registered
+ (reported by Liudapeng@github)
+
 2.12.3 (12-Apr-2021)
 2.12.2 (03-Mar-2021)