diff --git a/test/hotspot/jtreg/runtime/LoaderConstraints/differentLE/Test.java b/test/hotspot/jtreg/runtime/LoaderConstraints/differentLE/Test.java
--- a/test/hotspot/jtreg/runtime/LoaderConstraints/differentLE/Test.java
+++ b/test/hotspot/jtreg/runtime/LoaderConstraints/differentLE/Test.java
@@ -31,7 +31,7 @@
  * @library /test/lib
  * @compile D_ambgs.jasm
  * @run driver ClassFileInstaller test.D_ambgs
- * @compile  ../common/PreemptingClassLoader.java
+ * @compile -g ../common/PreemptingClassLoader.java
  *           test/D_ambgs.java Test.java test/B.java
  * @run driver ClassFileInstaller test.B
  * @run main/othervm Test
@@ -100,6 +100,7 @@
 
             throw new RuntimeException("Expected LinkageError was not thrown.");
         } catch (LinkageError jle) {
+            printMessyStackTraces(jle);
             String errorMsg = jle.getMessage();
             if (!errorMsg.contains(expectedErrorMessage_part1) ||
                 !errorMsg.contains(expectedErrorMessage_part2)) {
@@ -115,4 +116,92 @@
     public static void main(String[] args) throws Exception {
         test_access();
     }
+    
+    /* Printouts of this method:
+     *
+     * java.lang.LinkageError: loader constraint violation: loader PreemptingClassLoader @694906c0 wants to load class test.D_ambgs. A different class with the same name was previously loaded by 'app'. (test.D_ambgs is in unnamed module of loader 'app')
+     * 	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
+     * 	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
+     * 	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:877)
+     * 	at PreemptingClassLoader.loadClass(PreemptingClassLoader.java:61)
+     * 	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
+     * 	at test.B.gen(B.java:31)
+     * 	at test.D_ambgs.make(D_ambgs.java:41)
+     * 	at Test.test_access(Test.java:99)
+     * 	at Test.main(Test.java:117)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
+     * 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
+     * 	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
+     * 	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
+     * 	at java.base/java.lang.Thread.run(Thread.java:832)
+     *
+     * java.lang.NullPointerException: Cannot invoke "Object.hashCode()" because "o" is null
+     * 	at Test.printMessyStackTraces(Test.java:124)
+     * 	at Test.test_access(Test.java:103)
+     * 	at Test.main(Test.java:117)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
+     * 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
+     * 	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
+     * 	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
+     * 	at java.base/java.lang.Thread.run(Thread.java:832)
+     * 
+     * 
+     * Exceptions where stack trace does not point to problematic source code:
+     *
+     * java.lang.LinkageError: loader constraint violation: loader PreemptingClassLoader @694906c0 wants to load class test.D_ambgs. A different class with the same name was previously loaded by 'app'. (test.D_ambgs is in unnamed module of loader 'app')
+     * 	at Test.printMessyStackTraces(Test.java:124)
+     * 	at Test.test_access(Test.java:103)
+     * 	at Test.main(Test.java:117)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
+     * 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
+     * 	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
+     * 	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
+     * 	at java.base/java.lang.Thread.run(Thread.java:832)
+     *
+     * java.lang.NullPointerException: Cannot invoke "Object.hashCode()" because "o" is null
+     * 	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
+     * 	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
+     * 	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:877)
+     * 	at PreemptingClassLoader.loadClass(PreemptingClassLoader.java:61)
+     * 	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
+     * 	at test.B.gen(B.java:31)
+     * 	at test.D_ambgs.make(D_ambgs.java:41)
+     * 	at Test.test_access(Test.java:99)
+     * 	at Test.main(Test.java:117)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
+     * 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
+     * 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
+     * 	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
+     * 	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
+     * 	at java.base/java.lang.Thread.run(Thread.java:832)
+     */       
+    static void printMessyStackTraces(Throwable le) {
+        Object o = null;
+        Exception npe = null;
+        try {
+            o.hashCode();
+        } catch (NullPointerException e) {
+            npe = e;
+        }
+
+        System.err.println("\nOriginal Exceptions:\n");
+        le.printStackTrace();
+        System.err.println();
+        npe.printStackTrace();
+
+        // Mess with stack traces.
+        StackTraceElement[] leTrace = le.getStackTrace();
+        le.setStackTrace(npe.getStackTrace());
+        npe.setStackTrace(leTrace);
+
+        System.err.println("\n\nExceptions where stack trace does not point to problematic source code:\n");
+        le.printStackTrace();
+        System.err.println();
+        npe.printStackTrace();
+    }
+    
+    
 }