From a0fc0a42e235fbdf25289a0ce5c4c838b0257939 Mon Sep 17 00:00:00 2001
From: Leonard <Leonard@Leonard.Leo>
Date: Mon, 15 Jun 2020 01:44:58 +0300
Subject: [PATCH] add exceptions

---
 exceptions.md | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/exceptions.md b/exceptions.md
index 65fc8a09..553715e0 100644
--- a/exceptions.md
+++ b/exceptions.md
@@ -1,7 +1,13 @@
-# Persistence:
+# Exceptions and Solutions
+
+## Persistence:
 
 ### Exception: java.lang.ClassCastException 
 * stack trace: class org.hibernate.mapping.SingleTableSubclass cannot be cast to class org.hibernate.mapping.RootClass
 * Possible Solution: Remove @Id Tags from Subclasses.
 
-### 
+### Exception: Unmapped class
+* Solution: Add class to persistence mapping in META-INF/persistence.xml
+
+### Exception: Primary key violation
+* Solution: an entity with this key already exists you idiot, change it!
-- 
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