It seems Oracle has closed the download of JRockit without giving any reasons.
Few months ago, I've deployed my app both in Sun VM 1.6 and JRockit R26 (support 1.6). Several differences are listed here: 1. as we know, there're some difference of vm starting parameters, so sometimes you may need to modify your parameters to adjust the VM. btw, a replace parameter list has been provided by BEA. 2. the difference of allocation mechanism would sometimes effect your memory parameters. Jrockit acquire a whole memory stack. so it may avoid some OOM error of tomcat(usually permant generation space oom) 3. both of them provide powerful tools for spying or debuging the main Java thead. Almost all the functions of those tools can be found in each JDK. the difference remains in out file format. eg: when you dump the whole heapspace, you may get two formats as the result of the reason i mentioned above. As a named SOLUTION, JRockit provide an intergrate GUI toolkit to developers,now named JRockit Mission Control Center. it is composed of the common requirement for debugging our java app, although we can find some third party tools with same funtions designed for SUN VM. JMCC is not free software. some of the powerful functions could not be activate after the VM's started for one hour. those functions is the Memory Leak Detection Tools which is declaimed as an intelligent tools to found potential memory leak in your code. 4. bytecode optimizing technology is another strengthness of Jrockit. you could see which class has been optimized by using jrcmd command with corret input parameters. I don't make a seperate benchmark test. I just collected my app benchmarks of each JDK. JRockit is actually faster than Sun VM. my app is mainly deployed in tomcat ,using Spring + Hibernate + Wicket. 5. No compatibility error was found during my shift with two jdk. 6. I suppose that Jrockit has a better thread management model with less memory usage according to my two same servers' performances. Under same configuration of my app,JRockit beats SunVM by bearing much heavier loader. That's some thinking that I want to share with you. 2008/6/18 Steve Ochani <[EMAIL PROTECTED]>: > Date sent: Wed, 18 Jun 2008 09:32:41 +0100 > From: James Law <[EMAIL PROTECTED]> > Subject: RE: Jrockit Vs Sun > To: Tomcat Users List <users@tomcat.apache.org> > Send reply to: Tomcat Users List <users@tomcat.apache.org> > > > Here are the download links > > http://commerce.bea.com/products/weblogicjrockit/jrockit_prod_fam-bea. > > js p I found them via the forums, you'd think they don't want you to > > download it! It seams Intel have bought out BEA so things could be > > looking up for JRockit. > > No, Oracle did :( > > > -Steve O. > > > > > > > > > -----Original Message----- > > From: Johnny Kewl [mailto:[EMAIL PROTECTED] > > Sent: 17 June 2008 18:31 > > To: Tomcat Users List > > Subject: Re: Jrockit Vs Sun > > > > ------------------ > > It seems to be licensed, ie not free, and if you can figure out how to > > download the thing from that site, you're a better detective than I > > am. It seems to be Suns JRE with tons of extra instrumentation, > > "mission control". In the news group I found ... the adoption is very > > low, so google is not > > > > going to be too rocket friendly. > > There was one article refering to Tomcat... so someones trying it out > > with TC. I imagine that from a biz point of view, the rocket is > > designed to launch you at their app server, and into premium support. > > Good plan I guess, but doesnt seem like too many people riding that > > rocket ;) Intel seems to be involved somehow in the rocket as well, > > maybe one day it will be a harmonious rocket ;) If I could have found > > the thing, would have given it a whiz. Competition is good I guess... > > would have been interesting to see how the "mission control" related > > to JMX and the JConsole, perhaps the rocket influenced that hole idea. > > Article is worth a read, the terms are all good for foreplay ;) > > > > ---------------------------------------------------------------------- > > -- --- HARBOR : http://www.kewlstuff.co.za/index.htm The most powerful > > application server on earth. 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