fixes some lgtm alerts

Author: wumpz

src/main/java/net/sf/jsqlparser/JSQLParserException.java

@@ -48,7 +48,7 @@ public JSQLParserException(String arg0, Throwable arg1) {
     }
 
     @Override
-    public Throwable getCause() {
+    public synchronized Throwable getCause() {
         return cause;
     }
 

src/main/java/net/sf/jsqlparser/util/TablesNamesFinder.java

@@ -152,9 +152,6 @@ public class TablesNamesFinder implements SelectVisitor, FromItemVisitor, Expres
 
     /**
      * Main entry for this Tool class. A list of found tables is returned.
-     *
-     * @param delete
-     * @return
      */
     public List<String> getTableList(Statement statement) {
         init(false);
@@ -174,9 +171,6 @@ public void visit(Select select) {
 
     /**
      * Main entry for this Tool class. A list of found tables is returned.
-     *
-     * @param update
-     * @return
      */
     public List<String> getTableList(Expression expr) {
         init(true);