src/de/steamwar/sql/NodeMember.java

@@ -85,7 +85,7 @@ public class NodeMember {
     }
 
     public void setParentId(Integer parentId) {
-        this.parentId = Optional.ofNullable(parentId).orElse(0) == 0 ? null : parentId;
+        this.parentId = parentId == null || parentId == 0 ? null : parentId;
         updateParent.update(this.parentId, nodeId, userId);
     }
 }

src/de/steamwar/sql/SchematicNode.java

@@ -24,8 +24,6 @@ import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.Setter;
 
-import java.io.ByteArrayOutputStream;
-import java.io.PrintStream;
 import java.sql.Timestamp;
 import java.time.Instant;
 import java.util.*;
@@ -38,7 +36,7 @@ public class SchematicNode {
         new SqlTypeMapper<>(SchematicNode.class, null, (rs, identifier) -> { throw new SecurityException("SchematicNode cannot be used as type (recursive select)"); }, (st, index, value) -> st.setInt(index, value.nodeId));
     }
 
-    protected static final Map<Integer, Map<String, List<String>>> TAB_CACHE = new HashMap<>();
+    private static final Map<Integer, Map<String, List<String>>> TAB_CACHE = new HashMap<>();
     public static void clear() {
         TAB_CACHE.clear();
     }