Re: OutOfMemoryError some time on some tomcat!!!!1
hi, Chuck.Caldarale I referenced to these two links http://blogs.sun.com/fkieviet/entry/classloader_leaks_the_dreaded_java http://blogs.sun.com/fkieviet/entry/how_to_fix_the_dreaded and do as the blog tolds, but failed to find the reason of the oom of my app... thanks though.. by the way, do you have the the jhat the articals mentioned? I went to the jdk/bin, but the jhat there seems not work as the author mentioned. 2010/11/23 Daniel Baktiar dbakt...@gmail.com hi charles, please allow me to disagree to that hanging onto reference as the main issue. permgen space is garbage collector's specific issue, not general hanging onto reference issue. it is caused by redeployment, which is the metadata for classes, marked to be permanent generation by the hotspot garbage collector. when you deploy new classes, the class loader will introduce memory usages that will also marked as permanent generation. permgen is oracle hotspot specific implementation issue. you won't get it when you run on oracle jrockit (which performs just in time compilation), for example. --- daniel baktiar http://savinggaia.tritiumapps.com - saving the planet is everyone's business! On 23 November 2010 14:10, Caldarale, Charles R chuck.caldar...@unisys.comwrote: From: xu cheng [mailto:xcheng@gmail.com] Subject: Re: OutOfMemoryError some time on some tomcat1 I just kept redeploying apps , and the perm gen keep growing each time I deploy the same app. and when I undeploy the app, the perm gen didn't clean the garbage Exactly the situation I suggested the other day: you have something that's hanging onto a reference to an object from your webapp classes, preventing the old webapp deployment from being garbage collected. Again, read this: http://wiki.apache.org/tomcat/FAQ/Memory Also, take a look at these: http://blogs.sun.com/fkieviet/entry/classloader_leaks_the_dreaded_java http://blogs.sun.com/fkieviet/entry/how_to_fix_the_dreaded - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.
the memory puzzle me....
hi; I oberved the heap of the jvm which runs tomcat without deploying any webapp. and it's some kind like this /|/|/|/|/|/| when the used heap goes up, there is a memory use of the heap, maybe allocation for the new class instances, and when it goes down , there is a gc, am I right? but I didn't deploy any app on the tomcat. I'm just wondering what is using the memory? best regards
Re: the memory puzzle me....
thanks, by the way, the permanent generation is also collected by major gc? and what will trigger a gc in the permanent generation best regards 2010/11/24 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: the memory puzzle me I oberved the heap of the jvm which runs tomcat without deploying any webapp. and it's some kind like this /|/|/|/|/|/| That's called a sawtooth pattern, and is what you should be seeing. when the used heap goes up, there is a memory use of the heap, maybe allocation for the new class instances, and when it goes down , there is a gc, am I right? Yes; the GC you're seeing is very likely what's called a minor GC, which cleans out only the young generation, which is where nearly all objects are created and the vast majority die. A major GC will process not only the young generation, but also the tenured (old) and so-called permanent ones. (Note that most things in the perm gen space are not actually permanent, and not necessarily even long-lived.) but I didn't deploy any app on the tomcat. I'm just wondering what is using the memory? Tomcat has numerous background threads doing such things as waiting for connections from clients, checking for webapp deployments, monitoring changes to deployed webapps, etc. All of these are creating a few objects for very short periods, over and over. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: the memory puzzle me....
thanks very much you help me alog by the way, do you know *any tool that can monitor the permanent generation*, such what's now resident in the perm gen? I know that in the linux the jmap -permheap pid will display something, like this class_loaderclassesbytesparent_loaderalive?type bootstrap11874691664 null liveinternal 0x84747550118080x846017d8dead sun/reflect/delegatingclassloa...@0x937f35f8 0x84685ee0118000x846017d8dead sun/reflect/delegatingclassloa...@0x937f35f8 0x84686030117920x846017d8dead sun/reflect/delegatingclassloa...@0x937f35f8 0x84686210117920x846017d8dead sun/reflect/delegatingclassloa...@0x937f35f8 it seems useless for me actually (I 'm new learning about this) cos the permanent gen occupy about 20MB and jmap list about 10 live class with 30 dead ones, I was confused with this I used some other profiler tools but they just show* how much* perm gen was used, but not *what they are used for* thanks best regards 2010/11/24 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: Re: the memory puzzle me the permanent generation is also collected by major gc? Correct. what will trigger a gc in the permanent generation When either the tenured or the permanent generation is full, someone calls System.gc(), or you click the Perform GC button in JConsole (or its equivalent in other profilers). - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: the memory puzzle me....
thanks!!! you really help me a lot! someone knows how to figure out how much permanent gen my vm is using? 2010/11/24 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: Re: the memory puzzle me by the way, do you know *any tool that can monitor the permanent generation*, such what's now resident in the perm gen? I presume you mean on Windows, since you already found one for Linux. I suspect the more sophisticated profilers like YourKit will do it, but I'm not sure. Others on the list use YourKit regularly, so they might be able to be more definitive when they wake up in an hour or two. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: the memory puzzle me....
I got it jmap -heap will print many things 2010/11/24 xu cheng xcheng@gmail.com thanks!!! you really help me a lot! someone knows how to figure out how much permanent gen my vm is using? 2010/11/24 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: Re: the memory puzzle me by the way, do you know *any tool that can monitor the permanent generation*, such what's now resident in the perm gen? I presume you mean on Windows, since you already found one for Linux. I suspect the more sophisticated profilers like YourKit will do it, but I'm not sure. Others on the list use YourKit regularly, so they might be able to be more definitive when they wake up in an hour or two. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: the memory puzzle me....
hi: thanks for replying the jvisualvm does show the capacity and the used of the perm gen that the vm use *currently* but not the size of the vm* configuration*: PermSize and MaxPermSize in my opinion , the MaxPermSize is the size that the perm gen is *allowed to expand to*, and the PermSize is the size that allocated when the vm*initially *started. and the capacity is the size that allocated to the vm* currently*. am I right? thanks by the way, I connect to a server remotely , there is only character interface for me best regards 2010/11/24 Blair Zajac bl...@orcaware.com You should check out jvisualvm which comes with any recent HotSpot JVM. I don't have a copy available on the laptop I'm on right now, but by looking at the screenshots, it looks like it shows the permanent generation: http://wiki.oracle.com/page/How+to+use+JConsole,+JVisualVM+or+VisualVM+with+Oracle+Application+Server Blair On Nov 23, 2010, at 9:54 PM, xu cheng wrote: thanks!!! you really help me a lot! someone knows how to figure out how much permanent gen my vm is using? 2010/11/24 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: Re: the memory puzzle me by the way, do you know *any tool that can monitor the permanent generation*, such what's now resident in the perm gen? I presume you mean on Windows, since you already found one for Linux. I suspect the more sophisticated profilers like YourKit will do it, but I'm not sure. Others on the list use YourKit regularly, so they might be able to be more definitive when they wake up in an hour or two. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: OutOfMemoryError some time on some tomcat!!!!1
hi Daniel thanks alot for replying. I don't know how to figure out how much the param MaxPermSize is set to. may be it's set to be default. I just set the xmx and xms, so I thought that the memory will absolutely enough, I didn't notice this param, my fault. I did an experiment on tomcat , I just kept redeploying apps , and the perm gen keep growing each time I deploy the same app. and when I undeploy the app, the perm gen didn't clean the garbage ( I think they are garbage, but I don't know whether the vm can figure it out, I monitor this with the jconsole in the jdk/bin). in the meanwhile , the code cache in the memory pool and the loaded classes grow with the same curve like the permanent generation. the unused class meta data wasn't cleaned up during each deployment. I always redeploy the apps with shutting down the server, I think that might be the point. by the way , this aritical help me a lot to understand it. http://blogs.sun.com/jonthecollector/entry/presenting_the_permanent_generation thanks again for helping 2010/11/23 Daniel Baktiar dbakt...@gmail.com hi xu cheng, having a powerful machine with big memory is good. but don't assume that everything will be used automatically. the jvm doesn't automatically use all the resources in your memory when you start tomcat. you need to configure it. try to add something like this: *CATALINA_OPTS=-XX:MaxPermSize=512m * inside your catalina.sh (linux/unix) or catalina.bat (windows). you can put this as the first line (after the comments, for example). try to run again and see whether you still have the same error(s). PermGen space is the permanent generational heap for storing data such as class data. you will bump into this when deploying a large application or deploying repetitively. you will still get the exception when deploying often, only less frequent. --- daniel baktiar http://savinggaia.tritiumapps.com - saving the planet is everyone's business! 2010/11/22 xu cheng xcheng@gmail.com after tracing the app with jprofiler for several hours , I still cannot figure the problem. it seems that the app doesn't use a lot of memory. and it still run pretty well in my computer.and after it is deployed in the server, it crash the problem of the environment? but the tomcat on the server has been running for a really long time with out any problem what's the point?.oh no (°ο°） 2010/11/22 xu cheng xcheng@gmail.com by the way, it doesn't throws this exception while running on my computer it is only when the app is deploy on another computer that this problem occur 2010/11/22 xu cheng xcheng@gmail.com hi: thanks for replying the app is running on a powerful server and the memory is suppose to be enough I'll check if there is a memory leak,(althouth the app is suppose to use only a few memory) thanks 2010/11/22 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: OutOfMemoryError some time on some tomcat1 the app works pretty well on my pc, and the tomcat is apache-tomcat-6.0.29 however , when I put this app on to another computer with the same tomcat it throws this exception Java HotSpot(TM) 64-Bit Server VM warning: Exception java.lang.OutOfMemoryError Exception in thread http-8080-24 java.lang.OutOfMemoryError: PermGen space 64-bit JVMs often require larger heap sizes than 32-bit ones. If the error occurs on the first deployment of the app, you may just need to configure a larger PermGen. However, if this error occurs only after redeploying your app some number of times, you likely have a memory leak. Use any of the widely available profilers or heap analysis tools to see just what is consuming memory. You can get some pointers here: http://wiki.apache.org/tomcat/FAQ/Memory - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: OutOfMemoryError some time on some tomcat!!!!1
ps: after several times of redeployment, java.lang.OutOfMemoryError: PermGen space comes up. I always redeploy the apps *without* shutting down the server 在 2010年11月23日 下午1:50，xu cheng xcheng@gmail.com写道： hi Daniel thanks alot for replying. I don't know how to figure out how much the param MaxPermSize is set to. may be it's set to be default. I just set the xmx and xms, so I thought that the memory will absolutely enough, I didn't notice this param, my fault. I did an experiment on tomcat , I just kept redeploying apps , and the perm gen keep growing each time I deploy the same app. and when I undeploy the app, the perm gen didn't clean the garbage ( I think they are garbage, but I don't know whether the vm can figure it out, I monitor this with the jconsole in the jdk/bin). in the meanwhile , the code cache in the memory pool and the loaded classes grow with the same curve like the permanent generation. the unused class meta data wasn't cleaned up during each deployment. I always redeploy the apps with shutting down the server, I think that might be the point. by the way , this aritical help me a lot to understand it. http://blogs.sun.com/jonthecollector/entry/presenting_the_permanent_generation thanks again for helping 2010/11/23 Daniel Baktiar dbakt...@gmail.com hi xu cheng, having a powerful machine with big memory is good. but don't assume that everything will be used automatically. the jvm doesn't automatically use all the resources in your memory when you start tomcat. you need to configure it. try to add something like this: *CATALINA_OPTS=-XX:MaxPermSize=512m * inside your catalina.sh (linux/unix) or catalina.bat (windows). you can put this as the first line (after the comments, for example). try to run again and see whether you still have the same error(s). PermGen space is the permanent generational heap for storing data such as class data. you will bump into this when deploying a large application or deploying repetitively. you will still get the exception when deploying often, only less frequent. --- daniel baktiar http://savinggaia.tritiumapps.com - saving the planet is everyone's business! 2010/11/22 xu cheng xcheng@gmail.com after tracing the app with jprofiler for several hours , I still cannot figure the problem. it seems that the app doesn't use a lot of memory. and it still run pretty well in my computer.and after it is deployed in the server, it crash the problem of the environment? but the tomcat on the server has been running for a really long time with out any problem what's the point?.oh no (°ο°） 2010/11/22 xu cheng xcheng@gmail.com by the way, it doesn't throws this exception while running on my computer it is only when the app is deploy on another computer that this problem occur 2010/11/22 xu cheng xcheng@gmail.com hi: thanks for replying the app is running on a powerful server and the memory is suppose to be enough I'll check if there is a memory leak,(althouth the app is suppose to use only a few memory) thanks 2010/11/22 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: OutOfMemoryError some time on some tomcat1 the app works pretty well on my pc, and the tomcat is apache-tomcat-6.0.29 however , when I put this app on to another computer with the same tomcat it throws this exception Java HotSpot(TM) 64-Bit Server VM warning: Exception java.lang.OutOfMemoryError Exception in thread http-8080-24 java.lang.OutOfMemoryError: PermGen space 64-bit JVMs often require larger heap sizes than 32-bit ones. If the error occurs on the first deployment of the app, you may just need to configure a larger PermGen. However, if this error occurs only after redeploying your app some number of times, you likely have a memory leak. Use any of the widely available profilers or heap analysis tools to see just what is consuming memory. You can get some pointers here: http://wiki.apache.org/tomcat/FAQ/Memory - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: OutOfMemoryError some time on some tomcat!!!!1
hi: thanks for the references. I 'll read that. by the way, *hanging onto a reference to an object from your webapp classes, preventing the old webapp deployment from being garbage collected. * what kind of object do you mean by saying this? classes relevant to the class loader? or something else? for example? thanks 2010/11/23 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: Re: OutOfMemoryError some time on some tomcat1 I just kept redeploying apps , and the perm gen keep growing each time I deploy the same app. and when I undeploy the app, the perm gen didn't clean the garbage Exactly the situation I suggested the other day: you have something that's hanging onto a reference to an object from your webapp classes, preventing the old webapp deployment from being garbage collected. Again, read this: http://wiki.apache.org/tomcat/FAQ/Memory Also, take a look at these: http://blogs.sun.com/fkieviet/entry/classloader_leaks_the_dreaded_java http://blogs.sun.com/fkieviet/entry/how_to_fix_the_dreaded - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
OutOfMemoryError some time on some tomcat!!!!1
hi: I've wrote an app with jsp and servlet, and I used four libs commons.logging common.httpclient jdom commons.codec the app works pretty well on my pc, and the tomcat is apache-tomcat-6.0.29 however , when I put this app on to another computer with the same tomcat it throws this exception Java HotSpot(TM) 64-Bit Server VM warning: Exception java.lang.OutOfMemoryError occurred dispatching signal SIGTERM to handler- the VM may need to be forcibly terminated it seems the exception of the jvm rather the tomcat. and some times like this Deploying web application archive XXX.war Exception in thread http-8080-24 java.lang.OutOfMemoryError: PermGen space Exception in thread http-8080-14 java.lang.OutOfMemoryError: PermGen space Exception in thread http-8080-2 java.lang.OutOfMemoryError: PermGen space and the memory is absolutely enough maybe it's my app's fault, but I cannot find it.. does anyone have had this kind of problem? or any suggestions ? thanks
Re: OutOfMemoryError some time on some tomcat!!!!1
hi: thanks for replying the app is running on a powerful server and the memory is suppose to be enough I'll check if there is a memory leak,(althouth the app is suppose to use only a few memory) thanks 2010/11/22 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: OutOfMemoryError some time on some tomcat1 the app works pretty well on my pc, and the tomcat is apache-tomcat-6.0.29 however , when I put this app on to another computer with the same tomcat it throws this exception Java HotSpot(TM) 64-Bit Server VM warning: Exception java.lang.OutOfMemoryError Exception in thread http-8080-24 java.lang.OutOfMemoryError: PermGen space 64-bit JVMs often require larger heap sizes than 32-bit ones. If the error occurs on the first deployment of the app, you may just need to configure a larger PermGen. However, if this error occurs only after redeploying your app some number of times, you likely have a memory leak. Use any of the widely available profilers or heap analysis tools to see just what is consuming memory. You can get some pointers here: http://wiki.apache.org/tomcat/FAQ/Memory - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: OutOfMemoryError some time on some tomcat!!!!1
by the way, it doesn't throws this exception while running on my computer it is only when the app is deploy on another computer that this problem occur 2010/11/22 xu cheng xcheng@gmail.com hi: thanks for replying the app is running on a powerful server and the memory is suppose to be enough I'll check if there is a memory leak,(althouth the app is suppose to use only a few memory) thanks 2010/11/22 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: OutOfMemoryError some time on some tomcat1 the app works pretty well on my pc, and the tomcat is apache-tomcat-6.0.29 however , when I put this app on to another computer with the same tomcat it throws this exception Java HotSpot(TM) 64-Bit Server VM warning: Exception java.lang.OutOfMemoryError Exception in thread http-8080-24 java.lang.OutOfMemoryError: PermGen space 64-bit JVMs often require larger heap sizes than 32-bit ones. If the error occurs on the first deployment of the app, you may just need to configure a larger PermGen. However, if this error occurs only after redeploying your app some number of times, you likely have a memory leak. Use any of the widely available profilers or heap analysis tools to see just what is consuming memory. You can get some pointers here: http://wiki.apache.org/tomcat/FAQ/Memory - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: OutOfMemoryError some time on some tomcat!!!!1
after tracing the app with jprofiler for several hours , I still cannot figure the problem. it seems that the app doesn't use a lot of memory. and it still run pretty well in my computer.and after it is deployed in the server, it crash the problem of the environment? but the tomcat on the server has been running for a really long time with out any problem what's the point?.oh no (°ο°） 2010/11/22 xu cheng xcheng@gmail.com by the way, it doesn't throws this exception while running on my computer it is only when the app is deploy on another computer that this problem occur 2010/11/22 xu cheng xcheng@gmail.com hi: thanks for replying the app is running on a powerful server and the memory is suppose to be enough I'll check if there is a memory leak,(althouth the app is suppose to use only a few memory) thanks 2010/11/22 Caldarale, Charles R chuck.caldar...@unisys.com From: xu cheng [mailto:xcheng@gmail.com] Subject: OutOfMemoryError some time on some tomcat1 the app works pretty well on my pc, and the tomcat is apache-tomcat-6.0.29 however , when I put this app on to another computer with the same tomcat it throws this exception Java HotSpot(TM) 64-Bit Server VM warning: Exception java.lang.OutOfMemoryError Exception in thread http-8080-24 java.lang.OutOfMemoryError: PermGen space 64-bit JVMs often require larger heap sizes than 32-bit ones. If the error occurs on the first deployment of the app, you may just need to configure a larger PermGen. However, if this error occurs only after redeploying your app some number of times, you likely have a memory leak. Use any of the widely available profilers or heap analysis tools to see just what is consuming memory. You can get some pointers here: http://wiki.apache.org/tomcat/FAQ/Memory - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: the tomcat encoding
hi:
thanks, the problem is that my tomcat interact with other server and the
server use somekind of encoding that is different.
and after the encoding is transfered .it works now
thanks
2010/11/17 Christopher Schultz ch...@christopherschultz.net
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Hash: SHA1
Rob,
On 11/16/2010 4:31 AM, Rob Gregory wrote:
I also use a filter to set the following:-
request.setCharacterEncoding(UTF-8);
response.setContentType(text/html; charset=UTF-8);
response.setCharacterEncoding(UTF-8);
FWIW, you shouldn't override any character encoding sent by the client.
If there is no encoding, feel free to default to UTF-8.
Within the final html output I always include the following meta tag:-
meta http-equiv=Content-Type content=text/xhtml;
charset=utf-8/meta
This only makes sense if the response is actually in UTF-8. I would
recommend something like this:
meta http-equiv=Content-Type content=text/xhtml;
charset={response.characterEncoding} /
http://wiki.apache.org/tomcat/FAQ/CharacterEncoding
- -chris
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oyMAoKR87o0U7voSaQ0OiUg9useP/aGJ
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-
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the tomcat encoding
hi all: I wrote an app and there are some chinese content, and there are some code like this str = new String(chineseContentString.getBytes(iso-8859-1), utf-8); the app runs pretty well in the tomcat of my pc. however ,when it was deployed in other machine. all the Chinese content becomes messy code. so ,does anyone know how to got to encoding of the tomcat. or it was just iso-8859-1 and cannot be changed? thanks by the way , the edition is 6.0.20
