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 958e497a7b..b6f751412e 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
@@ -73,6 +73,7 @@ public void validateSubType(DeserializationContext ctxt, JavaType type,
         final Class<?> raw = type.getRawClass();
         String full = raw.getName();
 
+        main_check:
         do {
             if (_cfgIllegalClassNames.contains(full)) {
                 break;
@@ -86,8 +87,8 @@ public void validateSubType(DeserializationContext ctxt, JavaType type,
                     // looking for "AbstractBeanFactoryPointcutAdvisor" but no point to allow any is there?
                     if ("AbstractPointcutAdvisor".equals(name)
                             // ditto  for "FileSystemXmlApplicationContext": block all ApplicationContexts
-                            || "AbstractApplicationContext.equals".equals(name)) {
-                        break;
+                            || "AbstractApplicationContext".equals(name)) {
+                        break main_check;
                     }
                 }
             }
diff --git a/src/test/java/com/fasterxml/jackson/databind/interop/IllegalTypesCheckTest.java b/src/test/java/com/fasterxml/jackson/databind/interop/IllegalTypesCheckTest.java
index b5002dcfe9..629a9adbe2 100644
--- a/src/test/java/com/fasterxml/jackson/databind/interop/IllegalTypesCheckTest.java
+++ b/src/test/java/com/fasterxml/jackson/databind/interop/IllegalTypesCheckTest.java
@@ -1,5 +1,8 @@
 package com.fasterxml.jackson.databind.interop;
 
+import org.springframework.jacksontest.BogusApplicationContext;
+import org.springframework.jacksontest.BogusPointcutAdvisor;
+
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.exc.InvalidDefinitionException;
@@ -68,6 +71,10 @@ public void testJDKTypes1855() throws Exception
     {
         // apparently included by JDK?
         _testIllegalType("com.sun.org.apache.bcel.internal.util.ClassLoader");
+
+        // also: we can try some form of testing, even if bit contrived...
+        _testIllegalType(BogusPointcutAdvisor.class);
+        _testIllegalType(BogusApplicationContext.class);
     }
 
     // 17-Aug-2017, tatu: Ideally would test handling of 3rd party types, too,
diff --git a/src/test/java/org/springframework/jacksontest/AbstractApplicationContext.java b/src/test/java/org/springframework/jacksontest/AbstractApplicationContext.java
new file mode 100644
index 0000000000..e537782fae
--- /dev/null
+++ b/src/test/java/org/springframework/jacksontest/AbstractApplicationContext.java
@@ -0,0 +1,5 @@
+package org.springframework.jacksontest;
+
+public class AbstractApplicationContext {
+
+}
diff --git a/src/test/java/org/springframework/jacksontest/AbstractPointcutAdvisor.java b/src/test/java/org/springframework/jacksontest/AbstractPointcutAdvisor.java
new file mode 100644
index 0000000000..0ee87e0416
--- /dev/null
+++ b/src/test/java/org/springframework/jacksontest/AbstractPointcutAdvisor.java
@@ -0,0 +1,5 @@
+package org.springframework.jacksontest;
+
+public class AbstractPointcutAdvisor {
+
+}
diff --git a/src/test/java/org/springframework/jacksontest/BogusApplicationContext.java b/src/test/java/org/springframework/jacksontest/BogusApplicationContext.java
new file mode 100644
index 0000000000..55dba37f0b
--- /dev/null
+++ b/src/test/java/org/springframework/jacksontest/BogusApplicationContext.java
@@ -0,0 +1,9 @@
+package org.springframework.jacksontest;
+
+//Made-up test class that should trigger checks for [databind#1855]
+public class BogusApplicationContext extends AbstractApplicationContext {
+    public BogusApplicationContext(String s) {
+        super();
+        throw new Error("Wrong!");
+    }
+}
diff --git a/src/test/java/org/springframework/jacksontest/BogusPointcutAdvisor.java b/src/test/java/org/springframework/jacksontest/BogusPointcutAdvisor.java
new file mode 100644
index 0000000000..c21d92399a
--- /dev/null
+++ b/src/test/java/org/springframework/jacksontest/BogusPointcutAdvisor.java
@@ -0,0 +1,9 @@
+package org.springframework.jacksontest;
+
+// Made-up test class that should trigger checks for [databind#1855]
+public class BogusPointcutAdvisor extends AbstractPointcutAdvisor {
+    public BogusPointcutAdvisor(String s) {
+        super();
+        throw new Error("Wrong!");
+    }
+}