Fix bad request (#255)

Author: slinkydeveloper

sdk-api-kotlin/src/main/kotlin/dev/restate/sdk/kotlin/Component.kt

@@ -150,7 +150,7 @@ private constructor(
           } catch (e: Throwable) {
             LOG.warn("Error when serializing input", e)
             throw TerminalException(
-                TerminalException.BAD_REQUEST_CODE, "Cannot serialize output: $e")
+                TerminalException.INTERNAL_SERVER_ERROR_CODE, "Cannot serialize output: $e")
           }
         } catch (e: Throwable) {
           callback.onCancel(e)

sdk-api/src/main/java/dev/restate/sdk/Component.java

@@ -167,7 +167,7 @@ public void handle(
             } catch (Throwable e) {
               callback.onCancel(
                   new TerminalException(
-                      TerminalException.BAD_REQUEST_CODE,
+                      TerminalException.INTERNAL_SERVER_ERROR_CODE,
                       "Cannot serialize output: " + e.getMessage()));
               return;
             }

sdk-common/src/main/java/dev/restate/sdk/common/TerminalException.java

@@ -13,7 +13,7 @@ public class TerminalException extends RuntimeException {
 
   public static final int ABORTED_CODE = 409;
   public static final int CANCELLED_CODE = ABORTED_CODE;
-  public static final int BAD_REQUEST_CODE = 500;
+  public static final int BAD_REQUEST_CODE = 400;
   public static final int INTERNAL_SERVER_ERROR_CODE = 500;
 
   private final int code;