in webspoon , i have closed web browser more than 12 hours ,but spoon objects still in memory. how to release spoon object?

[fenghuayin199]

Checklist before submitting an issue

• This issue does not happen on Spoon.
  If your issue happens on Spoon too, it originates from Spoon (not from webSpoon). Please look at Pentaho Community Forums, or seek help at Hitachi Vantara Community, or submit an issue at Pentaho JIRA).
• I searched for existing issues at here and there.

Expected Behavior

Actual Behavior

Screenshots and error messages are helpful.

Steps to Reproduce the Problem

Specifications

Server

If deployed as a Docker container

• Docker tag (e.g., hiromuhota/webspoon:0.9.0.21):

Else

• OS (e.g., Mac OS X 10.12.6):
• Java (e.g., Oracle JDK 8u151):
• Servlet container (e.g., Apache Tomcat 8.5.20):
• webSpoon (e.g., version: 0.8.0.13 or commitId: 0211d84):

Client

• OS (e.g., Mac OS X 10.12.6):
• Browser (e.g., Google Chrome 64.0.3282.140):