instead of creating exception complaining about not found, try to deserialize it to the application failure exception

Author: shijiesheng

src/main/java/com/uber/cadence/client/ApplicationFailureException.java

@@ -15,29 +15,10 @@
 package com.uber.cadence.client;
 
 import com.uber.cadence.CadenceError;
-import java.util.Objects;
 
 public final class ApplicationFailureException extends CadenceError {
 
   public ApplicationFailureException(String message) {
     super(message);
   }
-
-  @Override
-  public boolean equals(Object obj) {
-    if (this == obj) {
-      return true;
-    }
-    if (obj == null || getClass() != obj.getClass()) {
-      return false;
-    }
-    ApplicationFailureException that = (ApplicationFailureException) obj;
-    return Objects.equals(getMessage(), that.getMessage())
-        && Objects.equals(getCause(), that.getCause());
-  }
-
-  @Override
-  public int hashCode() {
-    return Objects.hash(getMessage(), getCause());
-  }
 }

src/main/java/com/uber/cadence/converter/CustomThrowableTypeAdapter.java

@@ -138,7 +138,7 @@ public T read(JsonReader jsonReader) throws IOException {
       try {
         classType = Class.forName(className);
       } catch (ClassNotFoundException e) {
-        return (T) new ApplicationFailureException("Class not found: " + className);
+        classType = ApplicationFailureException.class;
       }
       if (!Throwable.class.isAssignableFrom(classType)) {
         throw new IOException("Expected type that extends Throwable: " + className);

src/test/java/com/uber/cadence/converter/JsonDataConverterTest.java

@@ -287,8 +287,7 @@ public void testExceptionNotFound() {
             RuntimeException.class,
             RuntimeException.class);
     assertEquals(ApplicationFailureException.class, fromConverted.getClass());
-    assertEquals(
-        "Class not found: com.uber.cadence.converter.ExceptionNotFound",
-        fromConverted.getMessage());
+    assertEquals("application exception", fromConverted.getMessage());
+    assertNotSame(fromConverted.getStackTrace().length, 0);
   }
 }