Re: which java ?
2012/6/1 André Warnier a...@ice-sa.com: Hi. I am in the process of installing a new system at a customer, Tomcat 6 being part of the mix. This is a Suse Enterprise Linux (SEL) system, and the sysadmins at the customer very strongly favor using the pre-packaged software available with that distribution. (A position which which I can sympathise, being myself the sysadmin for a bunch of systems). Anyway, the question is not directly about Tomcat, but about the Java JVM. Under that version of SEL, the standard Java package is not the Oracle/Sun JVM, but this one : Java 1.6.0 IBM SR10.1-0.3.1 My question is : are there any kinds of problems/differences to be expected running Tomcat 6 over that JVM, as compared to the comparable Oracle/Sun version which I otherwise use everywhere else ? And if yes, in which area could the differences show up ? The Tomcat applications to be run on that system are minimal, but there are a couple for which I do not have (and cannot get) the sources. Or to phrase the question otherwise : are there strong reasons to push for installing instead an Oracle/Sun 1.6 JVM on that system (outside the SEL package management system and thus risking to inconvenience the sysadmins) to run Tomcat 6 on it ? 1. The memory leaks protection code (in JreMemoryLeakPreventionListener and in WebappClassLoader) is written based on analysis of flaws in Sun/Oracle implementation of JRE. Your experience with other JVMs might be different. I would not say that this is a critical feature though, as many are still using 5.5 where no such protection was ever implemented. Look for issue 52850:in Tomcat 7 changelog. I think it was not ported to 6.0, as changelog of 6.0 does not mention it. 2. Testing, testing, testing... I would try to run Tomcat 7 testsuite on that JDK to see if there are any noticeable failures. There is no such suite for 6.0 though. Maybe you can use some automated tests from some web applications. Best regards, Konstantin Kolinko - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: which java ?
Konstantin Kolinko wrote: 2012/6/1 André Warnier a...@ice-sa.com: Hi. I am in the process of installing a new system at a customer, Tomcat 6 being part of the mix. This is a Suse Enterprise Linux (SEL) system, and the sysadmins at the customer very strongly favor using the pre-packaged software available with that distribution. (A position which which I can sympathise, being myself the sysadmin for a bunch of systems). Anyway, the question is not directly about Tomcat, but about the Java JVM. Under that version of SEL, the standard Java package is not the Oracle/Sun JVM, but this one : Java 1.6.0 IBM SR10.1-0.3.1 My question is : are there any kinds of problems/differences to be expected running Tomcat 6 over that JVM, as compared to the comparable Oracle/Sun version which I otherwise use everywhere else ? And if yes, in which area could the differences show up ? The Tomcat applications to be run on that system are minimal, but there are a couple for which I do not have (and cannot get) the sources. Or to phrase the question otherwise : are there strong reasons to push for installing instead an Oracle/Sun 1.6 JVM on that system (outside the SEL package management system and thus risking to inconvenience the sysadmins) to run Tomcat 6 on it ? 1. The memory leaks protection code (in JreMemoryLeakPreventionListener and in WebappClassLoader) is written based on analysis of flaws in Sun/Oracle implementation of JRE. Your experience with other JVMs might be different. I would not say that this is a critical feature though, as many are still using 5.5 where no such protection was ever implemented. Look for issue 52850:in Tomcat 7 changelog. I think it was not ported to 6.0, as changelog of 6.0 does not mention it. 2. Testing, testing, testing... I would try to run Tomcat 7 testsuite on that JDK to see if there are any noticeable failures. There is no such suite for 6.0 though. Maybe you can use some automated tests from some web applications. Thanks Konstantin. So far, it seems to run, and I have not yet seen any scary out-of-place messages in the logs. But I only have a tiny test app for now. I'll run some heavier tests next week. I'll look up issue 52850. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: which java ?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 André, On 6/1/12 4:44 AM, André Warnier wrote: Or to phrase the question otherwise : are there strong reasons to push for installing instead an Oracle/Sun 1.6 JVM on that system (outside the SEL package management system and thus risking to inconvenience the sysadmins) to run Tomcat 6 on it ? Sun/Oracle seems to be the most compatible JVM out there, but the IVM JVM has already been very good. It used to be (10 years ago?) that the IBM JVM was measurably faster than the Sun JVM, though it tended to eat-up memory more quickly. OpenJDK is also a very solid JVM these days. I believe Oracle recently changed the redistribution license for the JDK/JRE such that Linux package managers either cannot or choose not to provide the Sun/Oracle JVM anymore. Most of the time, I see OpenJDK as the default. If the IBM JVM is already installed, give it a try. If you have nothing installed already, you might want to see if the OpenJDK JVM is an option and go with that. The more users the better. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk/JClYACgkQ9CaO5/Lv0PCYsQCdGfM/9aileiiIRN6X0BOiJYuc 37gAoJMSn6sVI1wMhhIkBQNSiqRVU6/G =qazt -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
