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Java Forum / General / June 2005totally unexplainable tomcat mystery!
Either tomcat is mad or I am! I have finally got my webapp to run with, most importantly, some awkward dlls, together with the application jar, installed in the WEB-INF\lib folder. All runs fine until I shutdown and restart tomcat. The only way I can get my app to work again is the following: remake my dlls and their jni classes - move these to eclipse so I can recreate the jar - move the jar and the dlls to the WEB-INF\lib - restarting tomcat then usually results in the app running ok. There may well be some redundancy between my steps but I can't leave any of them out, I have to go back to the beginning and I am utterly mystified. Please enlighten me if you can - or at least suggest what I might try to cure this. Thanks Ian Catnip! Tru borland.public.appserver.servlet-jsp-tomcat for tomcat troubles. thanks -is that a url you've given me? (and what's a catnip!?) Actually, I'm trying it 'the long way round', or at least, the other way round, and I've put my full directory tree of classes in WEB-INF\classes instead. Now I get a good old NoClassDefFoundError! I know that the class in question is there where it should be I know that, where I copied the whole directory structure from (an eclipse workspace) it works I know that if I try to access it from the console in its new location (with WEB-INF\classes on the classpath) it works But, when I try to access it via Tomcat from a jsp page I get the error. I know that this error has a hundred possible causes but maybe someone can suggest a shorter list with the clues offered. One last clue - this class is a JNI class which I've compiled separately and I wonder if that has anything to do with it - in any case, I'm not surprised that this is the one giving me the headache! Thanks Ian (... borland.public.appserver.servlet-jsp-tomcat ) > thanks -is that a url you've given me? No - it is another Usenet newsgroup. <http://groups.google.com.au/group/borland.public.appserver.servlet-jsp-tomcat> ..like this one.. <http://groups.google.com.au/group/comp.lang.java.programmer> ..but more specific to your problem. >..(and what's a catnip!?) ..perhaps a reference to "Either tomcat is mad or I am!"? [ From vague memory, catnip either cures madness in cats (shrugs) ..or causes it! ] HTH  SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane > >..(and what's a catnip!?) > > ..perhaps a reference to "Either tomcat is mad or I am!"? > [ From vague memory, catnip either cures madness in cats > (shrugs) ..or causes it! ] cat·nip cat·nip (kàt¹nîp´) noun 1. A hairy, aromatic perennial herb (Nepeta cataria) in the mint family, native to Eurasia and containing an aromatic oil to which cats are strongly attracted. 2. Any of various other mostly aromatic plants in the genus Nepeta, cultivated for their ornamental foliage and clusters of blue, lavender, or white flowers. [cat + nip, catnip (variant of nep, from Middle English nept, nep, from Old English nepte, from Latin nepeta, aromatic herb, perhaps of Etruscan origin).] >>>..(and what's a catnip!?) >> [quoted text clipped - 4 lines] > cat·nip > cat·nip (kàt¹nîp´) noun ... (snip) > ..perhaps of Etruscan origin).] Aaah, those Etruscans.. Well - ..get all technical on me, why not?!? [ ;-) ] SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane Right, fascinating, but meanwhile, back 'on-subject'....thanks for the explanation of what Seamus indicated, however, having just posted my query I've noticed that it is pretty dead down there so I won't be holding my breath waiting for an answer. Is there any chance of being pointed in the right direction for my NoClassDefFoundError - and I was only joking about Tomcat ok? I'm just new round here, as you know. Thanks, hopefully Ian > ...Is there any chance of being > pointed in the right direction for my NoClassDefFoundError - At this stage the information you have provided is not specific enough (especially in relation to paths) for me to understand what is happening. But then - I am no web app. or JNI expert, in any case. SignatureAndrew Thompson http://www.PhySci.org/codes/ Web & IT Help http://www.PhySci.org/ Open-source software suite http://www.1point1C.org/ Science & Technology http://www.LensEscapes.com/ Images that escape the mundane I thought that Tomcat had its own system of classpaths etc and it was only a question of putting the classes, jars, libraries etc in the right place? But if you're not an expert then I'll wait for someone who is....thanks Ian Here is some clarification for anyone who is listening... The NoClassDefFoundError is a red herring. My real problem, badly explained at the top of this thread boils down to this..... An unexpected exception has been detected in native code outside the VM. Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x67462713 Function=[Unknown.] I did seem to manage to get the thing to work but usually this is where I finish up. Without going in to long, badly expressed, explanations I'll just say that I believe my problem is that my dlls, accessed from my java classes, can't talk to each other - passing a pointer to one as a method argument to another causes this crash. When I run something out of my app from the (windows) command line I get the same crash if I am not positioned in the directory holding the dlls - this may or may not be called the 'working directory'. I need to be able, when running the app from jsp pages via Tomcat, to ensure that I am effectively 'anchored' so that my dlls don't get lost. Any help greatly appreciated Ian Hi Ian, Is it your 1-st try to run servlet under Tomcat? Did you try to run it on your own computer or in Internet/Intranet? Also, see below... Vlad > Here is some clarification for anyone who is listening... > The NoClassDefFoundError is a red herring. [quoted text clipped - 3 lines] > An unexpected exception has been detected in native code outside the > VM. Take a look to follow string you provided: "ACCESS_VIOLATION" > Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at > PC=0x67462713 > Function=[Unknown.] Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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