-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Bill,
On 12/11/13, 12:53 PM, Bill Davidson wrote: > On 12/11/2013 7:14 AM, Christopher Schultz wrote: >> >>>> 3. cath IOException in a filter and set an application >>>> attribute. Check this attribute from your monitor. >>>> >>>> I've been considering doing this, because I can rig it so >>>> that the error handler does not actually require any memory >>>> to run. The problem is that sometimes OOMEs interrupt one >>>> thread and not another. You may not catch the OOME in that >>>> thread -- it may happen in a background thread that does not >>>> go through the filter. >>> I'm not sure I understand this one. How does an IOException >>> relate to an OOME? >> Sorry, I meant of course OutOfMemoryError. Just make sure you use >> as little memory as possible during the exception handler or it >> will fail itself and possibly mask the original problem. >> >> - > > You can catch an OOME in a fiter? I would not have expected that. Sure, why not? You can catch anything that extends from Throwable[1]. Now, the handler might not actually succeed if it needs too much memory to run, the JVM could actually call-over completely before the catch block runs, etc. Basically, there are no guarantees: you can only do your best. - -chris [1] Technically, the JVM allows you to throw and catch anything you want to. The compiler is much more stringent. If you want to go through the effort, you can use a Java "assembler" to build bytecode directly, and the "throw" instruction will take any reference argument. You can also set up a catch handler that will catch non-Throwables. At least, you used to be able to do all this. It's possible that modern .class verifiers will complain loudly if you try to do silly things like this. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJSqSh3AAoJEBzwKT+lPKRY0c4P/0yF73JykERsbycHMHDTeBd4 q2m8QkPe7Hlv+ZjddQXMA1TVQ0HU3uM6oJwrmdR5r51AQlRRMtHk5OD9N9ExV5GX b8Oxtg6mzXKSdy5u/vOfw0VCwxwx79HnXi8yWmcbYG/6PaQCM0L91SzSvoy09jjP jIh79iRbQjAnIg0z/WxOS2jlWvt9piO8irtEUVZ13J+K2wcloi+dMvCxrgA+fJnq n7ELIJBGMVLMzo6/9WHdTas9xKaKfifLyrlgLCrWeFT5r7aFKSFjtk6xz2Jz+qsW G3qW4ALBUuubxNxZZ82knmUnoUsrhi7BZEAoK8RcSdHHHZc9n54hWabk63iEFhQ8 Wow0kpwe3/XKTkR+zJrtOqeNO6dJYUI/jxf/3LIuiIBtbKx8GZpxRoI9Tl/dg8ds /qrFbAHDTLmhgTqgQEs5y+fUczDH2oc+g6TWpjchH/MoJAoRCjg63dMRMrdee88w ZCNT49yExsmQBgO9HGPmSUlU1HpRPJnvRFn54oRSbB7cDPOUhAnSADUQ7SUIm6G2 21KqZ4Y/5pP5zlIpekykOW3AGpvQKrZptMaDkUNm4s2BzH5w+B3+bQDb65jmFSL1 1Piy+QASDWXAOZC1UkYF9ltg/Se79qh8Kbar1mdfdp+u3HGGv9AoGztvjsX3FBc/ ddIIoVPPi9DohZdwocLj =iO7b -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
