Re: jdk servlets on Linux
Camilo Wilson wrote: > > Using Apache Jserv for servlets does work, but it requires a good dose > of masochism. Much, much easier is to use the Java Web Server from Sun > (free evaluation, under $300), Solaris version. About 1/10 the > configuration time, in my experience. You will need the JSDK classes > from Sun too. Free evaluation, but not free (in every sense of the word) and IMHO not a better product than Apache. If you simply want to run a small scale website with servlets, doubtless the JWS will seem infinitely simpler to set up, but once you start working with bigger distributed systems (processing servlets on machines other than the server), the advantages of Apache JServ, used as a fully distributed servlet engine, become obvious. Such features obviously increase the complexity of the configuration, but it is really quite logical and straightforward and by no means beyond anybody who has the patience to read the documentation...and any sysadmin worth their salt. IMO by no means a qualification for masochism. I may be wrong, but I would suggest that most people who feel the way you do simply find the whole Apache compilation process cumbersome and frustrating I would recommend using Apache's DSO (dynamic loadable module) feature, so that you don't have to recompile the whole of Apache every time you wish to add a module such as JServ, and thus makes life a lot simpler. > We have also found Apache Jserv servlets are slower than servlets served > by the Java Web Server on the same box. Probably due to inefficient > communication between Apache and VM (uses sockets). The JWS is slightly faster than Jserv at the moment, but this is rapidly changing following discussion on the developer mailing lists - the final release of v1.0 (currently 1.0b3) will be out very soon - and also in my opinion such a difference is irrelevant since it is like comparing apples with oranges - the JWS will simply allow you to run servlets on a web server, whereas Apache Jserv enables Apache with a fully distributed servlet engine. Basically, the point is that Apache + JServ, gives you the best web server combined with a powerful servlet engine that has the scalability to handle your site as it grows, which seems to only be getting better... together with the added advantages of free software, which in the very least case is that it won't cost you anything! -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
JNI from JDK1.2 on Linux-2.0.36 hangs in method JNI_CreateJavaVM()
Hi,
My little JNI HelloWorld C++ program hangs when invoking
JNI_CreateJavaVM() with following output:
> export LD_BIND_NOW=true
> export RTLD_NOW=true
> invokecpp
[Opened /usr/local/jdk1.2Pre1/jre/lib/rt.jar in 29 ms]
[Opened /usr/local/jdk1.2Pre1/jre/lib/i18n.jar in 4 ms]
-> here it stays forever
The old version, calling the JDK 1.1 interface (Blackown Java 1.1.7)
runs fine.
CAN ANYBODY PROVIDE ME A LITTLE HELLOWORLD JNI SAMPLE CODE WHICH WORKS?
I couldnt find any example for the new JDK-2 JNI API, so perhaps im
using it wrong.
My Environment:
-
- Pentium Linux 2.0.36 with glibc
- jdk1.2pre-v1.tar from Blackdown
How i compiled it:
-
export LD_BIND_NOW=true
export RTLD_NOW=true
g++ -D_REENTRANT -I/usr/local/jdk/include -I/usr/local/jdk/include/linux
invoke.C -o invokecpp -L/usr/local/jdk/jre/lib/i386 -ljava -L
/usr/local/jdk/jre/lib/i386/native_threads -lhpi
-L/usr/local/jdk/jre/lib/i386/classic -ljvm
How invoke.C looks like:
--
#include
main()
{
JNIEnv *env;
JavaVMInitArgs vm_args;
JavaVMOption options[4];
options[0].optionString = "-Djava.compiler=NONE"; /*
disable JIT */
options[1].optionString = "-Djava.class.path=.";/* user
classes */
options[2].optionString = "-Djava.library.path=."; /* set
native library path */
options[3].optionString = "-verbose:jni,class,gc"; /* print
JNI-related messages */
vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = 4;
vm_args.ignoreUnrecognized = JNI_TRUE;
JavaVM *jvm;
jint res = JNI_CreateJavaVM(&jvm, (void **)&env, &vm_args);
. here it hangs :-(
Thanks very much for any hint,
Marcel
PS: Please send answers to [EMAIL PROTECTED] as well
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DnD to native app like kfm
I have a serious problem. I try to program an kfm-like app with ftp and http-file transfer feature. But the DnD-mechanism made me stumbling: In the javaworld-articel about dnd I read that it makes no sense to transmit object references. But it seems to me that it is the only possible solution: If I mark some files in one window (e.g. currently ftp.something.com) and drag them to a kfm window onto my local disk. Then - if I have understand it right - I have to download it into the jvm. After that I have to create an InputStream and pass all the data of the files in it. Then kfm will read it. Given the lousy performance of Streams on all platforms it will be so slow no one will use it. Yes, there is a possibility to transmit only the filenames. But how would kfm handle it? And thus everytime I have always two connection to the specified ftp-server: One holds the java app to determine the filenames, and the other has kfm to download it. Not very elegant. If someone has a hint for me, I would be very glad, willi -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
printing in java2
Hi all, forgive me if this has been asked before as i am just new to the list. in java 1.1.7 when you print a page, if there is any text not going horizontaly across the page (i.e. virtically) the text is printed at screen resolution and looks realy terable. The same goes for any line drawn that is not horizontal or vertical. My question is that does java 2 fix this limitation, and if not is there any plan to fix it in the near future? Justin Lawler -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: JNI from JDK1.2 on Linux-2.0.36 hangs in method JNI_CreateJavaVM()
> Marcel Ruff developer writes: Marcel> Hi, Marcel> My little JNI HelloWorld C++ program hangs when invoking Marcel> JNI_CreateJavaVM() with following output: >> export LD_BIND_NOW=true >> export RTLD_NOW=true >> invokecpp Marcel> Marcel> [Opened /usr/local/jdk1.2Pre1/jre/lib/rt.jar in 29 ms] Marcel> [Opened /usr/local/jdk1.2Pre1/jre/lib/i18n.jar in 4 ms] -> here it stays forever Please try again with 'export LD_PRELOAD=libpthread.so'. Juergen -- Juergen Kreileder, Universitaet Dortmund, Lehrstuhl Informatik V Baroper Strasse 301, D-44221 Dortmund, Germany Phone: ++49 231/755-5806, Fax: ++49 231/755-5802 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: JIT and unexpected verify errors for jdk1.2
> Dimitris Vyzovitis wrote: > At any rate, who could answer questions concerning the linux port of sunwjit? > PS: Hopefully tya1.3 will be out real soon, so that we don't have to depend on > sunwjit... OK, you won't to be depend on sunwjit, but don't expect to be faster than sunwjit. (Hope you are not disappointed to much.) Any JIT will call a lot of functions residing inside the JVM. May be some of them are not yet optimized in the first alpha release of 1.2/linux? As mentioned, there is an early TYA1.3 running here but I have some heavy problems to get EXCEPTIONS_BY_SIGNALS running. A threads problem maybe. And BTW bug hunting is difficult because there are bugs inside the JVM and of course my TYA bugs. Why I am speaking about ``bugs inside the JVM''? Simply because sunwjit doesn't run using green threads. But nobody knows why ?? So I hope the people @blackdown will release another version really soon. BTW does anyone knows the current state of JDK1.2 for FreeBSD ? (You know, TYA runs on FreeBSD too.) Cheers Albrecht CC: [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Fonts messages again
Jesus Correas Fernandez wrote: > > Last 03/15/1999 Kazuki Yasumatsu wrote how to fix the 'font > specification not found' messages. i've tried this solution step by > step, but when >i run > the Stylepad demo appears: > > [75]> java Stylepad > Font specified in font.properties not found [-urw-zapf ] > Font specified in font.properties not found [-urw-zapf ] > Font specified in font.properties not found [-urw-zapf ] > Font specified in font.properties not found [-urw-zapf ] > > What's wrong? > If you look carefully at the fonts.properties he provided, a few lines were wrapped in his post. grep through it for "zapf" and those lines will be readily apparent. Just un-wrap them and everything should be fine. > Thanks in advance. > > Jesus. -- Matthew McKeon - [EMAIL PROTECTED] Developer | MAYA Viz, Ltd. | 2100 Wharton St. | Pittsburgh, PA 15203 | 412.488.2900 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
new Linux-related RFE on the JDC
Hi y'all. I've posted a new RFE to the Java Developer Connection asking that Javasoft either provide a port of the Java Plug-In to Linux or that they provide additional resources to Blackdown towards that end. The URL is: http://developer.javasoft.com/developer/bugParade/bugs/4229178.html (bug ID 4229178) Granted, bugs on the JDC don't seem to garner much attention, however if they get lots and lots of votes (hint hint) Javasoft might just sit up and take notice. Please vote for it! :) -- Matthew McKeon - [EMAIL PROTECTED] Developer | MAYA Viz, Ltd. | 2100 Wharton St. | Pittsburgh, PA 15203 | 412.488.2900 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Problems with the appletviewer etc
I'm not sure if this is strictly a Linux Java problem or what, but the appletviewer can't find any imported classes (other than the core library) at runtime. My classpath is right (the applets compile, applicaitons have no trouble, and even Netscape runs the applets - though terrible performance as compared to what I'm used to). Somebody must have run into this problem, please help. Also I can't get any debugging to work properly, but maybe it's a JDE problem, I don't know . . . mark [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: JNI from JDK1.2 on Linux-2.0.36 hangs in method JNI_CreateJavaVM() - RESOLVED (THANKS)
Juergen Kreileder wrote: > > Marcel Ruff developer writes: > > Marcel> Hi, > Marcel> My little JNI HelloWorld C++ program hangs when invoking > Marcel> JNI_CreateJavaVM() with following output: > > >> export LD_BIND_NOW=true > >> export RTLD_NOW=true > >> invokecpp > Marcel> > Marcel> [Opened /usr/local/jdk1.2Pre1/jre/lib/rt.jar in 29 ms] > Marcel> [Opened /usr/local/jdk1.2Pre1/jre/lib/i18n.jar in 4 ms] > > -> here it stays forever > > Please try again with 'export LD_PRELOAD=libpthread.so'. > > Juergen > That helped, it runs now fine. Thank you for your instant help! Solving problems in the free software world is done in minutes :-) thanks, Marcel -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: JNI from JDK1.2 on Linux-2.0.36 hangs in method JNI_CreateJavaVM()
Riyad Kalla wrote:
> Wait... what is JNI? And why does all that code at the bottom look so
> complicated for "Hello World"?
>
> Thanks in advance.
>
> Riyad
>
> --
> > From: Marcel Ruff developer <[EMAIL PROTECTED]>
> > To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> > Subject: JNI from JDK1.2 on Linux-2.0.36 hangs in method
> JNI_CreateJavaVM()
> > Date: Friday, April 16, 1999 6:35 AM
> >
> > Hi,
> >
> > My little JNI HelloWorld C++ program hangs when invoking
> > JNI_CreateJavaVM() with following output:
> >
> > > export LD_BIND_NOW=true
> > > export RTLD_NOW=true
> > > invokecpp
> >
> > [Opened /usr/local/jdk1.2Pre1/jre/lib/rt.jar in 29 ms]
> > [Opened /usr/local/jdk1.2Pre1/jre/lib/i18n.jar in 4 ms]
> >
> > -> here it stays forever
> >
> > The old version, calling the JDK 1.1 interface (Blackown Java 1.1.7)
> > runs fine.
> >
> > CAN ANYBODY PROVIDE ME A LITTLE HELLOWORLD JNI SAMPLE CODE WHICH WORKS?
> >
> > I couldnt find any example for the new JDK-2 JNI API, so perhaps im
> > using it wrong.
> >
> >
> > My Environment:
> > -
> > - Pentium Linux 2.0.36 with glibc
> > - jdk1.2pre-v1.tar from Blackdown
> >
> >
> > How i compiled it:
> > -
> > export LD_BIND_NOW=true
> > export RTLD_NOW=true
> > g++ -D_REENTRANT -I/usr/local/jdk/include -I/usr/local/jdk/include/linux
> > invoke.C -o invokecpp -L/usr/local/jdk/jre/lib/i386 -ljava -L
> > /usr/local/jdk/jre/lib/i386/native_threads -lhpi
> > -L/usr/local/jdk/jre/lib/i386/classic -ljvm
> >
> >
> > How invoke.C looks like:
> > --
> > #include
> >
> > main()
> > {
> > JNIEnv *env;
> >
> > JavaVMInitArgs vm_args;
> > JavaVMOption options[4];
> >
> > options[0].optionString = "-Djava.compiler=NONE"; /*
> > disable JIT */
> > options[1].optionString = "-Djava.class.path=.";/* user
> > classes */
> > options[2].optionString = "-Djava.library.path=."; /* set
> > native library path */
> > options[3].optionString = "-verbose:jni,class,gc"; /* print
> > JNI-related messages */
> >
> > vm_args.version = JNI_VERSION_1_2;
> > vm_args.options = options;
> > vm_args.nOptions = 4;
> > vm_args.ignoreUnrecognized = JNI_TRUE;
> >
> > JavaVM *jvm;
> > jint res = JNI_CreateJavaVM(&jvm, (void **)&env, &vm_args);
> > . here it hangs :-(
> >
> >
> > Thanks very much for any hint,
> >
> > Marcel
> >
> > PS: Please send answers to [EMAIL PROTECTED] as well
> >
> >
> > --
> > To UNSUBSCRIBE, email to [EMAIL PROTECTED]
> > with a subject of "unsubscribe". Trouble? Contact
> [EMAIL PROTECTED]
> >
>
JNI ist the nativ interface from Java, to acces C/C++ etc.
I use Java-Swing as my portable GUI toolkit for our C++ software.
Marcel
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jdk1.2 on RedHat 5.2 (undefined symbol in libfontmanager.so)
As like everyone else I can't get jdk1.2 (specifially the SwingSet demo) to run on RedHat 5.2 I orginally got the shared lib error about libfontmanager and libstdc++-libc.6-1.so. I installed the egcs stuff to get the right lib (I can't find the version that blackdown used 91.61?) As per the readme.linux I installed the libstdc++--libc6.0-1.so.2 and then set the LD_PRELOAD to it's path and still got the following error: -- Exception in thread "main" java.lang.UnsatisfiedLinkError: /usr/local/src/jdk1.2/jre/lib/i386/libfontmanager.so: /usr/local/src/jdk1.2/jre/lib/i386/libfontmanager.so: undefined symbol: __deregister_frame_info -- Any help on this is greatly appreciated -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: JIT and unexpected verify errors for jdk1.2
> BTW does anyone knows the current state of JDK1.2 for FreeBSD ? > (You know, TYA runs on FreeBSD too.) It's a ways away. Some progress has been made, but we're waiting for the Linux patches to be released for some of the integration, and Steve hasn't (yet) done that. Nate -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: JIT and unexpected verify errors for jdk1.2
> > At any rate, who could answer questions concerning the linux port of sunwjit?
>
> > PS: Hopefully tya1.3 will be out real soon, so that we don't have to depend on
> > sunwjit...
>
> As mentioned, there is an early TYA1.3 running here but I have some
> heavy problems to get EXCEPTIONS_BY_SIGNALS running. A threads problem maybe.
> And BTW bug hunting is difficult because there are bugs inside the JVM
> and of course my TYA bugs.
In general no good idea to follow up own mails, but
for your imagination what kind of bugs I am speaking about
look at this:
public class Moo
{
public static void main(String args[])
{
try
{
int M=0,o=0;
o=o/M;
}
catch (Exception )
{
System.out.println("catch ex "+);
}
try
{
Thread.currentThread().sleep( 1 );
}
catch (InterruptedException e)
{
System.out.println("main sleep interrupted");
}
System.out.println("END");
}
}
Moo running jdk1.2v1a+TYA1.3/unreleased (***) gives this:
green native
== ==
TYA compiled
EXC_BY_SIGNALS: hangs okay
NO EXC_BY_S...: okayokay
---
sunwjit : hangs okay
Does a such TYA release really makes sense..?
Consider: most users would use EXC_BY_SIGNALS and green threads
as best choice. And in general it's much slower than jdk1.1+TYA.
Still interested in release ??
Cheers,
Albrecht
PS:
(***) Moo running -green using sunwjit hangs too, of course.
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Keypad support with non-Redhat.
I'm running Debian and the numeric keypad 1-9 keys do not work at all. Searching the archives I found this advice for the problem: Adam Williams wrote: > I upgraded from the JVM that comes with RedHat 4.2 (kaffe) to > Blackdown's JVM (jdk1.1.6v2-libc5). Drop and go, beautiful, better > than my previous attempts to use thier JVM. It seems MUCH faster > and in some subtle way even seems to "look" better. But now my > numeric keypad doesn't work, it does nothing, num-lock on or off. > [...] Adam, This is where these are defined on my system /usr/X11R6/lib/X11/XKeysymDB. But make sure that you have a link to them from here also /usr/X386/lib/X11/XKeysymDB. If for some reason you don't have this file (XKeysymDB) a good copy of it comes with Netscape that you can copy over to these locations. Hope this helps, K.R. On my Debian box there is no /usr/X386 directory but I have /usr/X11R6/lib/X11/XKeysymDB and /usr/lib/X11/XKeysymDB and they are correct. This is really frustrating because my app is a tic-tac-toe game that I'm writing for CS255 and the only keys I really need on the keyboard are the 1-9 keypad ones. All other keypad keys like '0' which I don't need actually work! Christopher -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Can´t load javax.swing.plaf... (jdk1.2)
Hello, after installing the new jdk1.2 and try to run the SimpleExample-Demo get the following output: ke@s10:/usr/lib/java/demo/jfc/Simple/src > java -Djava.compiler= SimpleExample Exception in thread "main" java.lang.Error: can't load javax.swing.plaf.metal.MetalLookAndFeel at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:826) at javax.swing.UIManager.initialize(UIManager.java:896) at javax.swing.UIManager.maybeInitialize(UIManager.java:913) at javax.swing.UIManager.getUI(UIManager.java:535) at javax.swing.JPanel.updateUI(JPanel.java:110) at javax.swing.JPanel.(JPanel.java:70) at javax.swing.JPanel.(JPanel.java:100) at SimpleExample.(SimpleExample.java:39) at SimpleExample.main(SimpleExample.java:135) can anybody help me? klaus -- Klaus Erber mailto:[EMAIL PROTECTED] maxheim wirtschaftsinformatik http://www.mwi-online.de -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
