diff --git a/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java b/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java

index 164ab3454..bdd3b2f4e 100644

--- a/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java

+++ b/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java

@@ -19,7 +19,10 @@ import com.fasterxml.jackson.databind.JsonMappingException;

  */

 public class SubTypeValidator

 {

-    protected final static String PREFIX_STRING = "org.springframework.";

+    protected final static String PREFIX_SPRING = "org.springframework.";

+

+    protected final static String PREFIX_C3P0 = "com.mchange.v2.c3p0.";

+

     /**

      * Set of well-known "nasty classes", deserialization of which is considered dangerous

      * and should (and is) prevented by default.

@@ -46,8 +49,9 @@ public class SubTypeValidator

         // [databind#1737]; 3rd party

 //s.add("org.springframework.aop.support.AbstractBeanFactoryPointcutAdvisor"); // deprecated by [databind#1855]

         s.add("org.springframework.beans.factory.config.PropertyPathFactoryBean");

-        s.add("com.mchange.v2.c3p0.JndiRefForwardingDataSource");

-        s.add("com.mchange.v2.c3p0.WrapperConnectionPoolDataSource");

+

+// s.add("com.mchange.v2.c3p0.JndiRefForwardingDataSource"); // deprecated by [databind#1931]

+// s.add("com.mchange.v2.c3p0.WrapperConnectionPoolDataSource"); // - "" -

         // [databind#1855]: more 3rd party

         s.add("org.apache.tomcat.dbcp.dbcp2.BasicDataSource");

         s.add("com.sun.org.apache.bcel.internal.util.ClassLoader");

@@ -86,8 +90,10 @@ public class SubTypeValidator

             // 18-Dec-2017, tatu: As per [databind#1855], need bit more sophisticated handling

             //    for some Spring framework types

             // 05-Jan-2017, tatu: ... also, only applies to classes, not interfaces

-            if (!raw.isInterface() && full.startsWith(PREFIX_STRING)) {

-                for (Class<?> cls = raw; (cls != null) && (cls != Object.class); cls = cls.getSuperclass()) {

+            if (raw.isInterface()) {

+                ;

+            } else if (full.startsWith(PREFIX_SPRING)) {

+                for (Class<?> cls = raw; (cls != null) && (cls != Object.class); cls = cls.getSuperclass()){

                     String name = cls.getSimpleName();

                     // looking for "AbstractBeanFactoryPointcutAdvisor" but no point to allow any is there?

                     if ("AbstractPointcutAdvisor".equals(name)

@@ -96,6 +102,16 @@ public class SubTypeValidator

                         break main_check;

                     }

                 }

+            } else if (full.startsWith(PREFIX_C3P0)) {

+                // [databind#1737]; more 3rd party

+                // s.add("com.mchange.v2.c3p0.JndiRefForwardingDataSource");

+                // s.add("com.mchange.v2.c3p0.WrapperConnectionPoolDataSource");

+                // [databind#1931]; more 3rd party

+                // com.mchange.v2.c3p0.ComboPooledDataSource

+                // com.mchange.v2.c3p0.debug.AfterCloseLoggingComboPooledDataSource 

+                if (full.endsWith("DataSource")) {

+                    break main_check;

+                }

             }

             return;

         } while (false);