Don't know I'm in this email chain I need to ask someone that really knows computers
Sent from my iPhone On Sep 11, 2013, at 1:43 PM, Christopher Schultz <ch...@christopherschultz.net> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Konstantin, > > On 9/11/13 12:44 PM, Konstantin Kolinko wrote: >> 2013/9/11 Christopher Schultz <ch...@christopherschultz.net>: >>> On 9/10/13 6:34 PM, George S. wrote: >>>> >>>> On 9/10/13 3:14 PM, Christopher Schultz wrote: >>>>> ----- Is there a way that I can specify something in the >>>>> server.xml code that would register them? The only thing I >>>>> can see is to create a org.apache.catalina.LifecycleListener >>>>> and put the code to register the plugins in there. >>>>> >>>>> Is there some other way of doing it? How would you do it if >>>>> you weren't running under Tomcat? >>>> >>>> I only ever run Java with tomcat (or maybe ant), so I wouldn't >>>> know. >>> >>> Okay. I had never heard of an "imageio plugin" before. Are you >>> basically registering file-type handlers? >>> >>> I'm just guessing at all of this, since I've never done anything >>> besides use ImageIO for mundane operations like loading, saving, >>> and re-sizing images. >>> >>> Have you called ImageIO.scanForPlugins()? >>> >>> The documentation gives light detains on how the plug-ins are >>> found: >>> >>> http://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html#scanForPlugins%28%29 >> >> Those docs say that scanning is performed automatically on first >> access. > > Aah, yes. I didn't read it very closely :) > >> As such, I would really recommend to write a Listener, so that >> whatever classes are found by scanning were loaded by the System >> classloader and had no references to the Webapp one. > > The implications of doing this are that George will need to place the > JAR file(s) containing his plug-ins in Tomcat's lib/ directory, so > they can be picked-up by the top-level ClassLoader. > > Using the existing JreMemoryLeakPreventionListener (with appropriate > configuration) might take care of this... I don't exactly know when > ImageIO will actually trigger this scan. > >> Having unexpected references to the Webapp classloader would be >> bad, as it leads to PermGen memory leaks. > > +1 > >> The above is just a theoretical recommendation. I do not know how >> ImageIO manages those classes internally. >> >> BTW, beware of known issue, mentioned in the FAQ, >> http://wiki.apache.org/tomcat/FAQ/KnownIssues#ImageIOIssues > > +1 > > - -chris > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.14 (Darwin) > Comment: GPGTools - http://gpgtools.org > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQIcBAEBCAAGBQJSMKvOAAoJEBzwKT+lPKRY0g0P/2tTM7Gs8NvoYNUNnCFcr5ZM > e2AE7XfcD3Pp8Te+NTe/8k6gLrjsSC0P8klhpn0WbFkipi73WWFYqjrAoTiZeRG6 > C47liEJ3qUxCEcYGk7BIIpYMaRmBvDbKsx6IRQolixIbnBOD7/A/7RjDenMBzedu > mLme921ruqYmTh9IICxwsjNiEbN7mjUf6DmMJnmyqisCBAOCUn7aj8aTLe8MJata > Kuj77Mwn7RipcRjISE9FVyBepcEx9jV1GzzJZtXSVQFffG5CrKm1k1lKROV7bZgr > pDR2EkMe3Pk91MeEJwMIpdImAFwgsfCq0vCq+iwTrvH8ES2T2OD1b+8NX4pwxmMu > C2bkjfWKgRvc2qZiGmwAIEAUecT63Rtwkwl2rTJQnGtlVwx11aGZD8HIJnKpxTIt > naOZo5+A7fCpuUEm+EtOFXehYeSsj4FTavJ0xupUgB/f2rm399e/B0Z/GUp6iVC6 > sRxfJ8aGs02x4miQQtVmKMD2SMRmRv57ks6H80luZiDU8EJ3cGB5gFydxeSsJ1br > pu2g4Y2LHgVWtz+51xWOH0OA9DUjIvGCI76nBHF/9vIqQ+63z2Zkk8DcCk8gDhW0 > t56grgIlxMJEJo/UAaWZWTWkreMixsEV/1XTrYkt0Iq3q6ravjg4OzBSFOz/w4mc > BdgA9RotiAa8IfM63dLx > =2zyh > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > 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
