500 Servlet Exception

java.lang.NumberFormatException: For input string: "https://jetster.site/weekend/"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
	at java.lang.Integer.parseInt(Integer.java:449)
	at java.lang.Integer.parseInt(Integer.java:499)
	at com.immuexa.gumbo.web.WebUtils.getId(WebUtils.java:108)
	at com.immuexa.gumbo.web.WebActionBase.getId(WebActionBase.java:45)
	at com.storymill.category.SmCategoryClickAction.perform(SmCategoryClickAction.java:55)
	at org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1787)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:126)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:103)
	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:113)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:177)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:221)
	at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:392)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:331)
	at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:464)
	at com.caucho.util.ThreadPool.run(ThreadPool.java:408)
	at java.lang.Thread.run(Thread.java:662)

Resin-3.0.8 (built Tue, 08 Jun 2004 02:25:40 PDT)