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我在弄清楚如何根据他们在组/人员选择器中选择的值将简单任务分配给一个人或一个组时遇到了一些麻烦。

因此，在我的 UI 中，用户可以使用相关的人员/组选择器控件来选择人员或组。

选择器控件

使用activiti assignment 属性，我将Assignee设置为${selectedPerson}，将Candidate Groups设置为${selectedGroup}. 这些变量与上面提到的选择器控件的值有关：

任务

总体目标是用户应该能够将任务分配给一个人或一个组，但是上面的设计存在以下问题：

  • 当用户选择一个组时，任务就成功地分配给了一个组，推测Assignee的值是可以为空的。
  • 但是，当用户选择一个人而不是一个组时，Activiti 会抛出以下异常，因为它期望一个组；

org.activiti.engine.ActivitiIllegalArgumentException：表达式未解析为字符串或字符串集合

这样做的正确方法是什么？

完整的堆栈跟踪

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.activiti.engine.ActivitiIllegalArgumentException: Expression did not resolve to a string or collection of strings
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    com.codahale.metrics.servlet.AbstractInstrumentedFilter.doFilter(AbstractInstrumentedFilter.java:97)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:149)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:168)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    com.activiti.security.CustomStatelessCSRFFilter.doFilterInternal(CustomStatelessCSRFFilter.java:68)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213)
    org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
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2 回答 2

2

这是因为 Activiti 接受候选组的 ID 作为字符串或逗号分隔的字符串值。但是表单元素（如您选择的那样）将所选组的组 ID 存储为 Long，因此IllegalArgumentException. 尝试在用户选择后将变量存储为字符串，然后将此字符串作为候选组传递。

您正在使用的方法只有在两者都满足${selectedPerson}并且${selectedGroup}具有非空值时才会满足。

或者，您可以在要分配的任务上创建任务侦听器并执行逻辑。

就像是：

public class CustomTaskListener implements TaskListener {
    @Override
    public void notify(DelegateTask delegateTask) {
    // get required variables
        String selectedPerson = (String) delegateTask.getVariable("selectedPerson");
        String selectedGroup = (String) delegateTask.getVariable("selectedGroup");
    // check for the condition
        if (null != selectedPerson && !selectedPerson.isEmpty()) {
    // set values
            delegateTask.setAssignee(selectedPerson);
        } else {
            delegateTask.addCandidateGroup(selectedGroup);
        }
    }
}
于 2018-01-24T07:40:52.197 回答
0

如果您想将任务分配给用户或组，则不能同时将两个受让人作为受让人和候选组

然后使用候选用户作为接受用户数组的受让人，如果您的第一个条件需要为真，则将变量设置为数组，然后将该用户添加到数组中，否则迭代组成员并将所有组成员添加到数组中，并将此数组变量传递给候选者用户作为受让人。

于 2018-01-24T09:39:24.183 回答