-----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
