{"id":585,"date":"2004-04-06T23:20:01","date_gmt":"2004-04-07T03:20:01","guid":{"rendered":"http:\/\/wordpress.cephas.net\/?p=585"},"modified":"2004-04-06T23:20:01","modified_gmt":"2004-04-07T03:20:01","slug":"upgrading-from-tomcat-4x-to-5019-javalangillegalstateexception","status":"publish","type":"post","link":"https:\/\/cephas.net\/blog\/2004\/04\/06\/upgrading-from-tomcat-4x-to-5019-javalangillegalstateexception\/","title":{"rendered":"Upgrading from Tomcat 4.x to 5.0.19: java.lang.IllegalStateException"},"content":{"rendered":"

Seems like this new ‘feature’ of Tomcat 5 is buried in Google, bringing it to the top for anyone interested. If you port a servlet from Tomcat 4.x to Tomcat 5 and you use (pseudo) code like this:
\n
\npublic void doPost(HttpServletRequest req,HttpServletResponse res) {
\n   \/\/ some sort of logic
\n  if (something) {
\n   forward(\"\/somewhere\", req, res);
\n  } else {
\n   \/\/ do this
\n  }
\n   \/\/ continue on with the page
\n}<\/p>\n

public void forward(String url, HttpServletRequest req, HttpServletResponse res)
\nthrows IOException, ServletException {
\n  RequestDispatcher rd = req.getRequestDispatcher(url);
\n  rd.forward(req, res);
\n}
\n<\/code>
\nyou’ll find that the servlet will throw a java.lang.IllegalStateException<\/a><\/code> with the message: Cannot forward after response has been committed<\/code>. This condition is easily fixed by adding a ‘return’ statement after you call the forward method. So instead, you’d have this:
\n
\n  if (something) {
\n   forward(\"\/somewhere\", req, res);
\n   return;
\n  } else {
\n   \/\/ do this
\n  }
\n   \/\/ continue on with the page
\n<\/code>
\nI bet this one catches alot of people coming from a scripting background where it’s fine and dandy to do a response.redirect() (ASP) or a <cflocation> and then continue on as if nothing had happened. <\/p>\n

Read it on jakarta.apache.org here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Seems like this new ‘feature’ of Tomcat 5 is buried in Google, bringing it to the top for anyone interested. If you port a servlet from Tomcat 4.x to Tomcat 5 and you use (pseudo) code like this: public void doPost(HttpServletRequest req,HttpServletResponse res) {    \/\/ some sort of logic   if (something) {    forward(“\/somewhere”, req, … Continue reading Upgrading from Tomcat 4.x to 5.0.19: java.lang.IllegalStateException<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts\/585"}],"collection":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/comments?post=585"}],"version-history":[{"count":0,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/posts\/585\/revisions"}],"wp:attachment":[{"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/media?parent=585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/categories?post=585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cephas.net\/blog\/wp-json\/wp\/v2\/tags?post=585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}