Fixing squid:S2259 - Null pointers should not be dereferenced

hibernate-core/src/main/java/org/hibernate/engine/spi/EntityUniqueKey.java

@@ -76,7 +76,7 @@ public class EntityUniqueKey implements Serializable {
 	@Override
 	public boolean equals(Object other) {
 		EntityUniqueKey that = (EntityUniqueKey) other;
-		return that.entityName.equals( entityName )
+		return that != null && that.entityName.equals( entityName )
 				&& that.uniqueKeyName.equals( uniqueKeyName )
 				&& keyType.isEqual( that.key, key );
 	}

hibernate-core/src/main/java/org/hibernate/internal/util/collections/IdentityMap.java

@@ -216,7 +216,7 @@ public final class IdentityMap<K,V> implements Map<K,V> {
 		@SuppressWarnings( {"EqualsWhichDoesntCheckParameterClass"})
 		@Override
 		public boolean equals(Object other) {
-			return key == ( (IdentityKey) other ).key;
+			return other != null && key == ( (IdentityKey) other ).key;
 		}
 
 		@Override

hibernate-core/src/main/java/org/hibernate/loader/JoinWalker.java

@@ -817,7 +817,7 @@ public class JoinWalker {
 		@Override
 		public boolean equals(Object other) {
 			AssociationKey that = (AssociationKey) other;
-			return that.table.equals( table ) && Arrays.equals( columns, that.columns );
+			return that != null && that.table.equals( table ) && Arrays.equals( columns, that.columns );
 		}
 
 		@Override

hibernate-core/src/main/java/org/hibernate/mapping/Table.java

@@ -869,7 +869,7 @@ public class Table implements RelationalModel, Serializable, Exportable {
 
 		public boolean equals(Object other) {
 			ForeignKeyKey fkk = (ForeignKeyKey) other;
-			return fkk.columns.equals( columns ) && fkk.referencedColumns.equals( referencedColumns );
+			return fkk != null && fkk.columns.equals( columns ) && fkk.referencedColumns.equals( referencedColumns );
 		}
 
 		@Override

hibernate-core/src/main/java/org/hibernate/service/internal/ConcurrentServiceBinding.java

@@ -118,7 +118,7 @@ public class ConcurrentServiceBinding<K,V> {
 			//so just let it happen as a form of assertion.
 			final Entry<K,V> other = (Entry<K,V>)obj;
 			//Reference equality on the key only!
-			return other.key == this.key;
+			return other != null && other.key == this.key;
 		}
 
 		@Override

hibernate-core/src/main/java/org/hibernate/tuple/entity/DynamicMapEntityTuplizer.java

@@ -130,7 +130,7 @@ public class DynamicMapEntityTuplizer extends AbstractEntityTuplizer {
 
 		@Override
 		public boolean equals(Object obj) {
-			return getClass().equals( obj.getClass() );
+			return obj != null && getClass().equals( obj.getClass() );
 		}
 
 		@Override