title: When a jenkins Job runs then its Upstream projects jobs will build automatically or we need to run upstream projects job separately then this job?
body: <p>When a jenkins Job runs then its Upstream projects jobs(dependent projects jobs) will build automatically or we need to run upstream projects job separatly then this job ?.</p>
  
  <p>When a job runs then its Downstream Projects jobs runs automatically or not ?</p>
  
  <p>I have 4 jobs</p>
  
  <p>Job-2,Job-3 depends on Job-1 .</p>
  
  <p>Job-4 depends on job-1,Job-2,Job-3 .</p>
  
  <p><strong>note:</strong> job-1,job-2,job-3 java projects and job-4 web project.</p>
  
  <p>I need JOB-4 as war then which job shall i run and How i configure jobs upstream ,downstream </p>