added DbShutdownException

Author: greenrobot

objectbox-java/src/main/java/io/objectbox/exception/DbShutdownException.java

@@ -0,0 +1,18 @@
+package io.objectbox.exception;
+
+/**
+ * Thrown when an error occurred that requires the DB to shutdown.
+ * This may be an I/O error for example.
+ * Regular operations won't be possible anymore.
+ * To handle that situation you could exit the app or try to reopen the store.
+ */
+public class DbShutdownException extends DbException {
+    public DbShutdownException(String message) {
+        super(message);
+    }
+
+    public DbShutdownException(String message, int errorCode) {
+        super(message, errorCode);
+    }
+
+}