-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Leigh,
On 5/1/14, 9:22 AM, L. HAYWARD wrote: > On 30/04/14 23:39, Konstantin Kolinko wrote: >> 2014-05-01 2:00 GMT+04:00 Hayward, Leigh >> <lh...@student.le.ac.uk>: >>> OK so I just spent an age trying to push my project to a >>> GitHub repositry but I think i must just be too tired to use my >>> brain correctly. Eventally gave up and just pasted my servlet >>> into a file there. >>> https://github.com/Leighbee13/RUNTHIS/tree/master Let me know >>> if this works! >> >> An interesting servlet... > > Yeah this is my first thing that I've made myself alone from start > to finish so it's not good. I haven't looked at the code, yet, but don't sell yourself short. You are trying to do some interesting work (the audio stuff) and then slap some plumbing around it to get it to work. This is uncharted territory for you. It may be a mess, but having other people look at your code is a good way to improve. If I knew I could get a PhD by writing a servlet, I'd have done it a long time ago :) >> The problem is that the names of your temporary files are >> constant ones. >> >> So if several requests are coming at the same time. several >> users' data will be written into the same file. >> > > I am just writing this for a dissertation project so it's just > handling 1 request right now, from me, in netbeans. So this error > shouldn't be to do with multiple requests, right? > > I did a test and used a random number generator to generate file > names instead of a count and it gives me null pointer errors when > trying to concatenate now. > > When it was overwriting, if it couldn't find the file it needed it > would just use the previously successfully uploaded file instead > of nullpointer-ing. But why isn't the file correctly uploaded by > the time the concatenate method try's to access it? This might have to do with the error you are getting. See below. > What does "java.lang.IllegalStateException: The resources may not > be accessed if they are not currently started?" mean? It sounds like your web application is restarting itself -- probably due to modifications to the code. When Tomcat is configured to auto-reload applications, you can trigger a re-load by re-compiling a class. In something like NetBeans, that's probably trivial do to... just save the file and it will probably re-compile and re-deploy. Try not doing that when running your tests... it may solve a great deal of your problems. >> If a user hasn't completed downloading her file, and another >> requests comes in, the "finished.wav" file will be overwritten >> with new data. >> >> Best regards, Konstantin Kolinko >> >> --------------------------------------------------------------------- >> >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> > > I screwed up the formatting for this email since I was being forced > to use outlook at uni, but now I'm on a linux machine with > thunderbird so it shouldn't happen again. The original question had > a better explanation and the errors that I was getting. > > It seemingly randomly works correctly (i.e. outputting the > correctly manipulated audio file) but sometimes, the file from a > previous run of the program is output instead, and I get one of > these errors: > > SEVERE [http-nio-8084-exec-30] > org.apache.catalina.loader.WebappClassLoader.clearReferencesThreads > The web application [/MyApp] is still processing a request that has > yet to finish. This is very likely to create a memory leak. You can > control the time allowed for requests to finish by using the > unloadDelay attribute of the standard Context implementation. You are definitely re-loading your web application. When this happens, a new copy of the webapp is deployed and can handle requests with your new code. If the old code is still actively running (i.e. still processing a request), you can get .. confusing results. You should take a thread dump [1] when this happens. It will tell you what code is (still) executing. Make sure you do it before you make another request to your web application. > (n.b. i did use unloadDelay and it made no difference.) > > and to me seemingly random numbers of these errors: > > "SEVERE [http-nio-8084-exec-87] > org.apache.coyote.http11.AbstractHttp11Processor.process Error > processing request java.lang.IllegalStateException: The resources > may not be accessed if they are not currently started?" The web application has officially stopped, but some code is still trying to operate within it. If you have a long-running request that survives the re-start (as evidenced above), then you'll get weird errors like this. > These second errors are ungooglable. The only reference to them is > on svn commits from tomcat devs. > > The files always upload correctly to my filesystem, but something > is going wrong when I try to access them in order to concatenate > them. > > It sometimes produces the wrong output but with no errors, but the > errors never occur when the expected output is created. Good to know. > I hope that makes sense. I've added my jsp, javascript and css to > my github repositry to see if that helps! > > https://github.com/Leighbee13/RUNTHIS/tree/master I'll take a look at both sets of files. Hopefully it's not too much code. Remember to thank the Tomcat community in your thesis publication. ;) - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJTaoqzAAoJEBzwKT+lPKRYzJsQAMXWX5jJ+PUxlSagSa3bZkFQ LaF8NYxacftGghKWW76jhYaPYp49lu4dW+kyshJI4KNGWbZXc8uD8L+u3QeyklJ1 FdcfaX3+M/ZZdcEsfl61BCDTCf0QBcdDLjM2T/agAklOu2sxPWf/R9QoGf/Icnzk yJHwILsF3vyhfx0UysNm4rq1/ZLiSqOO2XsbCWUky0zClGE5IzbqRSWVGTn2gDRT nTSWXEyEBPozyInGqbyZlJk460I9OD78l3OXdmxP/67fQx2rNUfC/tyKVHxU4TS5 lIw9F+cJyuZKXxT37MD75w3p8j0g135bhGTCHXvnLchoF3vExZAXi10oIkPHJWIy 0Po+oRgqGsLdW9iFomhh8DsPDIX1bgZRUlRgi78mE6Z61bKt0fJUKa8Ug1QqoQTH IB16fOAhCCD3wwwAhPrcCfQnQrRgdxaaQiY6r2fQkHlDQ8WC9eQedBtECK+w5zdl +eoK9qOKagsvfjQZ3N8qrusxfL7vx1hSLPoESkxvFXF2AqhCIKyvz4ut1RBckA0i eviUXNXpiOJW099D+L3duw5X9QnYjPAIbm9eCZp2U2sfmaYVXyzNxzZjCdMt0hNJ kXXy9TisVlfKl8MR9bUIewalAq+xWL1vSoV3VgrwNaTbWScc2p68schHxrDpYMTT rjGN0Nca+fZJ5kr6ynmm =z2Ts -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
