Depend on different exception type

src/main/java/it/cavallium/dbengine/client/SnapshotException.java

@@ -1,6 +1,6 @@
 package it.cavallium.dbengine.client;
 
-public class SnapshotException extends RuntimeException {
+public class SnapshotException extends IllegalStateException {
 
 	public SnapshotException(Throwable ex) {
 		super(ex);

src/main/java/it/cavallium/dbengine/database/serialization/SerializationException.java

@@ -1,6 +1,6 @@
 package it.cavallium.dbengine.database.serialization;
 
-public class SerializationException extends RuntimeException {
+public class SerializationException extends IllegalStateException {
 
 	public SerializationException() {
 		super();

src/main/java/it/cavallium/dbengine/utils/DBException.java

@@ -1,8 +1,9 @@
 package it.cavallium.dbengine.utils;
 
 import java.io.IOException;
+import java.io.UncheckedIOException;
 
-public class DBException extends RuntimeException {
+public class DBException extends IllegalStateException {
 
 	public DBException(String message) {
 		super(message);