java-devel July 2005

java-devel@lists.fedoraproject.org

53 participants
53 discussions

Eclipse + CVS issues
by Andrew Overholt 21 Jul '05

21 Jul '05

Hi, We have two issues with CVS that I'd like to sort out and hopefully get fixes into our gcc RPMs before their FC4 update. 1. checkouts of large-ish projects (GNU Classpath is something I've used as a test case) get "stuck" at about 83% finished. This is about the best information I have at this point, but tests with combinations of stock FC4 gcc (4.0.0-8, I believe) and stock FC4 Eclipse (3.1.0.M6.22 or something like that) or rawhide gcc (4.0.1-x) and rawhide Eclipse (3.1.0_fc-2) would be greatly appreciated. If we can narrow down when this problem occurred, it would help in finding its cause. I don't remember this happening with what we had around FC4 release time. Also, does CVS compression level affect this? 2. switching to the team synchronization perspective throws an error [1]. There's a similar bug [2], but I'm not sure if they're the same thing. I'm not sure if these are related to problem 1. above. If we can get some back traces and maybe some gdbing going on, hopefully we can track these bugs down. This is how I usually debug this kind of thing: install eclipse-debuginfo and gcc-debuginfo. Once I've got Eclipse in the state that I want it, I attach to that process with gdb (ps aux | grep java .. get the process # ... gdb /usr/bin/java <process id from above>). There are usually around 15 threads and I think the CVS one is usually # 5. You can see thread information with the gdb command 'info threads'. Switching between threads is easy ('thread x') and you can get back traces for any of them with 'bt' (note that I'm just putting the quotes around the gdb commands but they're not necessary). You can steph through things with 's' and continue with 'c'. I read this page [3] once and it helped with signal ignoring. I'm not sure if it's necessary, but I've got this in my .gdbinit to deal with it: handle SIGPWR nostop noprint handle SIGXCPU nostop noprint It'll be great when we get full JDWP support in GNU Classpath and gcc so that debugging these library issues (I've already determined that this isn't a native compilation issue) will be easier. Thanks, Andrew [1] https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=163079 [2] https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=161518 [3] http://gcc.gnu.org/java/gdb.html

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.jar and .so both loaded?
by Peter Backlund 20 Jul '05

20 Jul '05

Hello. I have a couple of questions about class loading in natively compiled Java applications: should an application that has been natively compiled (i.e. all .jars compiled into .so by gcj and a .db created, according to http://gcc.gnu.org/wiki/How%20to%20BC%20compile%20with%20GCJ) load both the .jars and the .so into memory? lsof seems to think that is the case. Also, Eclipse in Rawhide consumes almost twice as much memory for starting up and opening HelloWorld.java as the Sun JVM 1.5.0_03/upstream Eclipse combination. Is it still possible to build a Java application into a standalone executable, that does not require gij to run? Is there any guilde on how to do that? /Peter Backlund

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by Vanessa J. Smith 19 Jul '05

19 Jul '05

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Jonas vs JTA
by Bryce McKinlay 18 Jul '05

18 Jul '05

java-1.4.2-gcj-compat provides a jta.jar which is linked against libgcj's libgcj.jar. It seems that libgcj is wrong to include JTA in the core class libraries. Previous J2SE versions may have included all of javax.transaction, but the current specs for 1.4.2 and 1.5 show that the J2SE now only includes a few exceptions, which are required by CORBA. Further, this creates difficulties testing FC's Jonas with other jpackaged JVMs because they require a separate jta.jar. I propose: 1. Removing JTA from libgcj/classpath (leaving just the 3 exceptions in javax.transaction which are provided by the J2SE) 2. Remove the jta.jar link from java-gcj-compat 3. Include a separate jta package in Fedora that contains jta.jar Anyone have concerns/problems with this? Bryce

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FC4: Howto change tge JDK
by C.F. Scheidecker Antunes 17 Jul '05

17 Jul '05

Hello all, Before FC4 I used to install SUN's or IBM's JDK and have a syslink under /usr/bin for java and javac. Not only that but I had them installed under /opt and then have the /etc/profile changed to have all from /opt/java/bin on the PATH. Now, they have done a whole total different deal with FC4. The jdk is configured such that there are even links under /etc/ What would be advisable in order to have a different JDK under FC4? I would like to get ride of the one that came with it. Thanks in advance, C.F.

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16 Jul '05

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by gss_info236＠yahoo.co.jp 15 Jul '05

15 Jul '05

1 0

激安ソフトウェア販売 Gekiyasu No.1
by Gekiyasu No.1 15 Jul '05

15 Jul '05

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1 0

FC4 Tomcat & Jakarta Hell
by C.F. Scheidecker Antunes 15 Jul '05

15 Jul '05

Hello All, FC4 comes with Tomcat5 and Jakarta stuff such as struts, commons, etc. However FC4 does not come with a SUN JVM and I usually install my own in place of the currently one. I also install my own Tomcat and Jakarta stuff so that I can have the latest. I've also noticed that there is a service created to run Tomcat5 as well. Tomcat5 runs with a user tomcat which seems great as it not acceptable to run it as root. However it is an older version, it is organized spreaded into separate and various rpm packages which is not productive as well as not scalable. Struts is even version 1.1. Hence what I need is to install my own stuff. What do you recommend regarding this issue? Shall I remove the entire FC4 stuff or keep it and install my Tomcat/Jakarta/Struts/JVM and then change the service to reflect on my installation? In this case I assume I will have to change the privileges of the tomcat user and group and also make my root directory and its subdirectories reflect those privileges. Any suggestions or docs on Tomcat for FC4? Does anyone use Tomcat/struts/Commons with FC4? Thanks in advance, C.F.

3 4

aot-compile-rpm
by Gary Benson 15 Jul '05

15 Jul '05

Over the past couple of days I've been writing a replacement for aot-compile and find-and-aot-compile. They were both good when they were first written but the demands of Eclipse and JOnAS have exposed numerous shortcomings. Attached is a copy of aot-compile-rpm which I'd like to commit into java-1.4.2-gcj-compat if everyone's agreeable. It's an order of magnitude more complex than aot-compile and find-and-aot-compile, but it's advantages over them are manifold: IT'S MUCH MORE USABLE ===================== Nativifying an rpm using aot-compile-rpm is a matter of copy-and-paste: 1. Remove "BuildArch: noarch" 2. Add "BuildRequires: java-1.4.2-gcj-compat >= 1.4.2.0-Xjpp" and "Requires(post,postun)" on same. 3. Add "aot-compile-rpm" to the very end of %install. 4. Add "/usr/bin/rebuild-gcj-db %{_libdir}" to %post and %postun. 5. Add "%attr(-,root,root) %{_libdir}/gcj/%{name}" to %files. With aot-compile or find-and-aot-compile step 4 was much more complex. I was always uneasy about nativifying things I didn't myself maintain, postgresql-jdbc for example, because I was wary of dropping a bunch of fragile code on someone else. No longer. IT FINDS JARS BY SIGNATURE RATHER THAN BY EXTENSION =================================================== find-and-aot-compile identifies jarfiles by their extension, ".jar", so it misses ".war", ".ear", ".rar", and anything else the Java world happens to invent. aot-compile-rpm identifies jarfiles by opening them, so it catches them no matter what they're called. It's already found some unexpected stuff. Tomcat, for example, has a couple of servlets that are disabled by default because they are in jarfiles called ".renametojar". aot-compile-rpm finds and compiles these, so if the user renames them to enable the servlets then they'll be running BC-compiled code. IT IGNORES SUBSETTED JARFILES ============================= Several packages contain jarfiles which are a subset of others. MX4J, for example, has the APIs in mx4j-jmx.jar, the implementation in mx4j-impl.jar, and both together in mx4j.jar. aot-compile-rpm recognises that compiling mx4j.jar will get every class in the other two jars too, so it'll only compile mx4j.jar. So, aot-compile-rpm compiles MX4J in half the time (and generates half the bytes) that find-and-aot-compile does. IT WORKS AROUND THE PPC GO2 LIMIT ================================= PPC machines are limited on the size of jarfiles that can be compiled in one go, affecting Eclipse and JacORB, as described at https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=158308. aot-compile-rpm splits large jarfiles on ppc to avoid this. One limitation of aot-compile and find-and-aot-compile that I have not addressed (yet) is SMP support. Andrew Overholt suggested generating a Makefile and letting make handle the complex stuff, which I think is an excellent idea. Implementing something along those lines is something I'd like to do, but I need to get ppc64 and s390* bootstrapped first. Cheers, Gary

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java-devel July 2005