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19-Sep-2019 11:06:09.284 严重 [http-nio-8080-exec-8] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [jsp] in context with path [/SSMProject_war] threw exception [在 [40] 行处理 [/guahaoadd.jsp] 时发生异常

37:                         </div>
38:                         <div class="bbD">
39:                             鎵?灞炰竴绾х瀹わ細<select class="input3" id="firstdepartment" name="firstdepartment.firstdepartmentid" onchange="checkFirst()">
40:                             <c:forEach items="#{list}" var="a">
41:                             <option value="${a.firstdepartmentid}">${firstdepartmentname }</option>
42:                             </c:forEach>
43:                         </select>


Stacktrace:] with root cause
	javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in &lt;forEach&gt;
		at org.apache.taglibs.standard.tag.common.core.ForEachSupport.toForEachIterator(ForEachSupport.java:274)
		at org.apache.taglibs.standard.tag.common.core.ForEachSupport.supportedTypeForEachIterator(ForEachSupport.java:238)
		at org.apache.taglibs.standard.tag.common.core.ForEachSupport.prepare(ForEachSupport.java:155)
		at javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(LoopTagSupport.java:256)
		at org.apache.jsp.guahaoadd_jsp._jspx_meth_c_005fforEach_005f0(guahaoadd_jsp.java:311)
		at org.apache.jsp.guahaoadd_jsp._jspService(guahaoadd_jsp.java:169)
		at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
		at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
		at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
		at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
		at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
		at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
		at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
		at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
		at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
		at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
		at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
		at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
		at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
		at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
		at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
		at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
		at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
		at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
		at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
		at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
		at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
		at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
		at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
		at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
		at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
		at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
		at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
		at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
		at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
		at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
		at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
		at java.lang.Thread.run(Thread.java:748)

javax.servlet.jsp.JspTagException

<c:forEach items=”#{list}” var=“a”>这个语句的$写成了#号,而且因为后台多个传值的集合都是list

Error running 'Tomcat 9': Address localhost:1099 is already in use

端口占用,netset -ano,找到1099占用的,关闭就可以