Thread: [Php-java-bridge-users] Which JDK to use?

Hi!

Im not very experienced with using Java on Linux, so I'd like to hear 
about your recommendation which Java-JDK I should install for compiling 
and using php-java-bridge on Linux (2.4).

Which one do you think will work best / most stable / fastest on Linux?
And which one is most tested with php-java-bridge?

Is php-java-bridge still beta-software, or can you recommend its use in 
production enviroments?

Thanks!

best regards
Andreas

Hi Peter

Peter Niederlag schrieb:

>I would think this mostly depends on the distribution you are using. The
>following information is based on experience with debian-distribution.
>  
>
We are using Gentoo here, there is support for sun, ibm, bea, compaq, 
blackdawn...
http://www.gentoo.org/doc/en/java.xml

>The blackdown packages have proven to work really reliable here.
>
>http://www.blackdown.org/java-linux/java2-status/index.html
>  
>

Hm, I tried IBM-JDK, since it was used in the example, and I could make 
the jdk work, but make of php-java-bridge failed:

gcc -shared  .libs/natcJavaBridge.o  -lrt  -march=pentium3 -Wl,-soname 
-Wl,libnatcJavaBridge.so -o .libs/libnatcJavaBridge.so
ar cru .libs/libnatcJavaBridge.a  natcJavaBridge.o
ranlib .libs/libnatcJavaBridge.a
creating libnatcJavaBridge.la
(cd .libs && rm -f libnatcJavaBridge.la && ln -s ../libnatcJavaBridge.la 
libnatcJavaBridge.la)
if gcc -DHAVE_CONFIG_H -I. -I. -I.  
-DEXTENSION_DIR="\"/usr/lib/php5/lib/php/extensions/no-debug-non-zts-20050617\"" 
-I/opt/ibm-jdk-bin-1.4.2/include  -D_REENTRANT  -O2 -march=pentium3 
-fomit-frame-pointer -MT RunJavaBridge.o -MD -MP -MF 
".deps/RunJavaBridge.Tpo" -c -o RunJavaBridge.o RunJavaBridge.c; \
then mv -f ".deps/RunJavaBridge.Tpo" ".deps/RunJavaBridge.Po"; else rm 
-f ".deps/RunJavaBridge.Tpo"; exit 1; fi
/bin/sh ./libtool --tag=CC --mode=link gcc  -O2 -march=pentium3 
-fomit-frame-pointer   -o RunJavaBridge  RunJavaBridge.o  -lrt
gcc -O2 -march=pentium3 -fomit-frame-pointer -o RunJavaBridge 
RunJavaBridge.o  -lrt
/opt/ibm-jdk-bin-1.4.2/bin/javac php/java/bridge/*.java
make[1]: *** [JavaBridge.jar] Killed
make[1]: Leaving directory 
`/var/tmp/portage/php-java-bridge-2.0.7/work/php-java-bridge-2.0.7/server'
make: *** 
[/var/tmp/portage/php-java-bridge-2.0.7/work/php-java-bridge-2.0.7/modules/libnatcJavaBridge.la] 
Error 2

Hm, and I have no idea what to do. Do you think it's a problem with the 
JDK, or a specific version? I installed ibm-jdk-bin-1.4.2 (but without 
any X components...)

>It has been running rock-stable here. Jost and his team(?) are really
>doing a tremendous job imho. Personally I have used it in development
>only yet.
>  
>

It really looks very promising - but first of all I have to make it work 
here.

btw.: which "running-mode" do you recommend? We use an Apache with 
mod_php here - should I run php-java-bridge as service, in the 
webserver/php?

What is the most stable version here?


best regards
Andreas

Hi Andreas,

Andreas Korthaus schrieb:
> Hi Peter
> 
> Peter Niederlag schrieb:
[...]
> Hm, I tried IBM-JDK, since it was used in the example, and I could make
> the jdk work, but make of php-java-bridge failed:
[...]
> make[1]: *** [JavaBridge.jar] Killed
> make[1]: Leaving directory
> `/var/tmp/portage/php-java-bridge-2.0.7/work/php-java-bridge-2.0.7/server'
> make: ***
> [/var/tmp/portage/php-java-bridge-2.0.7/work/php-java-bridge-2.0.7/modules/libnatcJavaBridge.la]
> Error 2
> 
> Hm, and I have no idea what to do. Do you think it's a problem with the
> JDK, or a specific version? I installed ibm-jdk-bin-1.4.2 (but without
> any X components...)

no idea, maybe it#s just compilation of tomcat-servlet failing? That
tripped me already sometimes. ;) (@Jost, wouldn't it make sense to
disable that by default?)

This is my configure without servlet compilation:

---------snipp------------

#! /bin/sh
#
# Created by configure

#'--prefix=/usr/local/php5' \

'./configure' \
'--disable-servlet' \
'--with-java=/usr/lib/j2se/1.4' \
"$@"


>> It has been running rock-stable here. Jost and his team(?) are really
>> doing a tremendous job imho. Personally I have used it in development
>> only yet.
>>  
>>
> 
> It really looks very promising - but first of all I have to make it work
> here.
> 
> btw.: which "running-mode" do you recommend? We use an Apache with
> mod_php here - should I run php-java-bridge as service, in the
> webserver/php?
> 
> What is the most stable version here?

I rely on documentation and use a standalone JVM which is connected via
sockets ("Mode 3" iirc)

Have fun,
Peter
-- 
Peter Niederlag * Neuer Sandberg 9 * 31535 Neustadt *
Fon 05036/924100 * Fax 05036/924105
http://www.niekom.de * TYPO3 und EDV Dienstleistungen *
http://www.clown-goli.de * Clown-Comedy-Jonglage-Animation *

>>Hm, I tried IBM-JDK, since it was used in the example, and I could make
>>the jdk work, but make of php-java-bridge failed:
>>    
>>
>[...]
>  
>
>>make[1]: *** [JavaBridge.jar] Killed
>>make[1]: Leaving directory
>>`/var/tmp/portage/php-java-bridge-2.0.7/work/php-java-bridge-2.0.7/server'
>>make: ***
>>[/var/tmp/portage/php-java-bridge-2.0.7/work/php-java-bridge-2.0.7/modules/libnatcJavaBridge.la]
>>Error 2
>>    
>>

OK, also sun and blackdown fail with the same error:

cc -shared  .libs/natcJavaBridge.o  -lrt  -march=pentium3 -Wl,-soname 
-Wl,libnatcJavaBridge.so -o .libs/libnatcJavaBridge.so
ar cru .libs/libnatcJavaBridge.a  natcJavaBridge.o
ranlib .libs/libnatcJavaBridge.a
creating libnatcJavaBridge.la
(cd .libs && rm -f libnatcJavaBridge.la && ln -s ../libnatcJavaBridge.la 
libnatcJavaBridge.la)
if gcc -DHAVE_CONFIG_H -I. -I. -I.  
-DEXTENSION_DIR="\"/usr/lib/php5/lib/php/extensions/no-debug-non-zts-20050617\"" 
-I/opt/sun-jdk-1.4.2.08/include -I/opt/sun-jdk-1.4.2.08/include/linux  
-D_REENTRANT  -O2 -march=pentium3 -fomit-frame-pointer -MT 
RunJavaBridge.o -MD -MP -MF ".deps/RunJavaBridge.Tpo" -c -o 
RunJavaBridge.o RunJavaBridge.c; \
then mv -f ".deps/RunJavaBridge.Tpo" ".deps/RunJavaBridge.Po"; else rm 
-f ".deps/RunJavaBridge.Tpo"; exit 1; fi
/bin/sh ./libtool --tag=CC --mode=link gcc  -O2 -march=pentium3 
-fomit-frame-pointer   -o RunJavaBridge  RunJavaBridge.o  -lrt
gcc -O2 -march=pentium3 -fomit-frame-pointer -o RunJavaBridge 
RunJavaBridge.o  -lrt
/opt/sun-jdk-1.4.2.08/bin/javac php/java/bridge/*.java
make[1]: *** [JavaBridge.jar] Killed
make[1]: Leaving directory 
`/var/tmp/portage/php-java-bridge-2.0.8/work/php-java-bridge-2.0.8/server'
make: *** 
[/var/tmp/portage/php-java-bridge-2.0.8/work/php-java-bridge-2.0.8/modules/libnatcJavaBridge.la] 
Error 2



gcc -shared  .libs/natcJavaBridge.o  -lrt  -march=pentium3 -Wl,-soname 
-Wl,libnatcJavaBridge.so -o .libs/libnatcJavaBridge.so
ar cru .libs/libnatcJavaBridge.a  natcJavaBridge.o
ranlib .libs/libnatcJavaBridge.a
creating libnatcJavaBridge.la
(cd .libs && rm -f libnatcJavaBridge.la && ln -s ../libnatcJavaBridge.la 
libnatcJavaBridge.la)
if gcc -DHAVE_CONFIG_H -I. -I. -I.  
-DEXTENSION_DIR="\"/usr/lib/php5/lib/php/extensions/no-debug-non-zts-20050617\"" 
-I/opt/blackdown-jdk-1.4.2.02/include 
-I/opt/blackdown-jdk-1.4.2.02/include/linux  -D_REENTRANT  -O2 
-march=pentium3 -fomit-frame-pointer -MT RunJavaBridge.o -MD -MP -MF 
".deps/RunJavaBridge.Tpo" -c -o RunJavaBridge.o RunJavaBridge.c; \
then mv -f ".deps/RunJavaBridge.Tpo" ".deps/RunJavaBridge.Po"; else rm 
-f ".deps/RunJavaBridge.Tpo"; exit 1; fi
/bin/sh ./libtool --tag=CC --mode=link gcc  -O2 -march=pentium3 
-fomit-frame-pointer   -o RunJavaBridge  RunJavaBridge.o  -lrt
gcc -O2 -march=pentium3 -fomit-frame-pointer -o RunJavaBridge 
RunJavaBridge.o  -lrt
/opt/blackdown-jdk-1.4.2.02/bin/javac php/java/bridge/*.java
make[1]: *** [JavaBridge.jar] Killed
make[1]: Leaving directory 
`/var/tmp/portage/php-java-bridge-2.0.8/work/php-java-bridge-2.0.8/server'
make: *** 
[/var/tmp/portage/php-java-bridge-2.0.8/work/php-java-bridge-2.0.8/modules/libnatcJavaBridge.la] 
Error 2



>no idea, maybe it#s just compilation of tomcat-servlet failing? 
>

I have disabled servlets (no use for it now)


>That
>tripped me already sometimes. ;) (@Jost, wouldn't it make sense to
>disable that by default?)
>
>This is my configure without servlet compilation:
>
>---------snipp------------
>
>#! /bin/sh
>#
># Created by configure
>
>#'--prefix=/usr/local/php5' \
>
>'./configure' \
>'--disable-servlet' \
>'--with-java=/usr/lib/j2se/1.4' \
>"$@"
>  
>

I'm doing the same. I'm using PHP 5.1RC1 - could that be an issue?


>I rely on documentation and use a standalone JVM which is connected via
>sockets ("Mode 3" iirc)
>  
>

OK, that's what I wanted to use too.

When I get it installed some day ;-)

regards
Andreas

Hi,


> >>make[1]: *** [JavaBridge.jar] Killed

cool :) -- are there any resource limits on your
system so that large applications get killed?




		
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Jost Boekemeier wrote:

>>>>make[1]: *** [JavaBridge.jar] Killed
>>>>        
>>>>
>
>cool :) -- are there any resource limits on your
>system so that large applications get killed?
>  
>

Hm, don't know, have nothing set by myself. Using Gentoo with kernel 
2.4.31 and grsecurity patch.

I tried as said sun, blackdawn and ibm jdks with the same error, and I 
tried PHP 5.1RC1, 5.0.5 and 4.3.11, allways with the same error.

Gentoo compiles every software (except jdk bins...) itself, and I have 
never had an error like that.

The system has 256 MB RAM.

best regards
Andreas

Hi Andreas,

> 2.4.31 and grsecurity patch.
> Gentoo compiles every software (except jdk bins...)

there's a known problem with older kernels and older
libc versions; due to the transition from Linux
threads to NPTL some software doesn't work anymore.

On RHEL/Fedora for example it is possible to use 

 export LD_ASSUME_KERNEL=2.4.21 

to work around this problem.


I think your OS vendor should provide a similar
workaround.

Anyway, a strace `which javac` test.java 2>strace.log
should give some insight.


Regards,
Jost Boekemeier




	

	
		
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Jost Boekemeier wrote:

>>2.4.31 and grsecurity patch.

OK, grsec/PAX was the problem. I found a lot of PAX and grsec messages 
in my syslog, e.g.:

Sep 30 21:19:23 rainbow PAX: From xxx.xxx.xxx.xxx: execution attempt in: 
/opt/ibm-jdk-bin-1.4.2/jre/bin/libjitc.so, 27f2d000-27f3c000 0024e000
Sep 30 21:19:23 rainbow PAX: terminating task: 
/opt/ibm-jdk-bin-1.4.2/bin/javac(javac):13640, uid/euid: 1000/1000, PC: 
27f3a0d0, SP: 5ffa9ccc
Sep 30 21:19:23 rainbow grsec: From xxx.xxx.xxx.xxx: denied resource 
overstep by requesting 4096 for RLIMIT_CORE against limit 0 for 
/opt/ibm-jdk-bin-1.4.2/bin/javac[javac:13640] uid/euid:1000/1000 
gid/egid:407/407, parent /bin/bash[bash:13217] uid/euid:1000/1000 
gid/egid:407/407


That's where I found the solution:

http://www.gentoo.org/proj/en/hardened/hardenedfaq.xml#paxjava
chpax -pemrxs /opt/*-jdk-*/{jre,}/bin/*

So it works now. I'm using ibm-jdk for now.

Should php-java-bridge work with PHP 5.1 (RC1)? It seems to work, or are 
there any known/expected problems?


best regards and thanks a lot!

Andreas

Jost Boekemeier wrote:

>>2.4.31 and grsecurity patch.

Ok, that seems to be the reason. I remember to have read something like 
that before...

Sep 30 21:19:23 rainbow grsec: From x.x.x.x: denied resource overstep by
  requesting 4096 for RLIMIT_CORE against limit 0 for 
/opt/ibm-jdk-bin-1.4.2/bin/
javac[javac:13640] uid/euid:1000/1000 gid/egid:407/407, parent 
/bin/bash[bash:13
217] uid/euid:1000/1000 gid/egid:407/407
(END)

it's a PAX restriction.

So I'll look for a solution and try again.

But could <ou tell me with which PHp version php-java-bridge should 
work? PHP5? even PHP 5.1?`


Best regards
Andreas

Hi Andreas,

> But could <ou tell me with which PHp version
> php-java-bridge should 
> work? PHP5? even PHP 5.1?`

the documentation says "4.3.2 or above, this includes
5.x or 6.x, of course.


Regards,
Jost Boekemeier




	

	
		
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Jost Boekemeier schrieb:

>Anyway, a strace `which javac` test.java 2>strace.log
>should give some insight.
>  
>

Seems I can't ececut anything from java.

if I type:

/opt/ibm-jdk-bin-1.4.2/bin/javac

I only get

"Killed"

on commandline.

When I use strace, the end is:

open("/opt/ibm-jdk-bin-1.4.2/jre/bin/libjitc.so", O_RDONLY) = 20
read(20, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300}\1"..., 
512) = 512
fstat64(20, {st_mode=S_IFREG|0755, st_size=2492116, ...}) = 0
mmap2(NULL, 3870384, PROT_READ|PROT_EXEC, MAP_PRIVATE, 20, 0) = 0x2f510000
mmap2(0x2f75f000, 61440, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 
20, 0x24e) = 0x2f75f000
mmap2(0x2f76e000, 1388208, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2f76e000
close(20)                               = 0
mprotect(0x2f510000, 2420736, PROT_READ|PROT_WRITE) = 0
mprotect(0x2f510000, 2420736, PROT_READ|PROT_EXEC) = 0
open("/etc/mtab", O_RDONLY)             = 20
fstat64(20, {st_mode=S_IFREG|0644, st_size=105, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0x2e6cf000
read(20, "/dev/hda3 / ext3 rw,noatime 0 0\n"..., 4096) = 105
close(20)                               = 0
munmap(0x2e6cf000, 4096)                = 0
open("/proc/stat", O_RDONLY)            = 20
fstat64(20, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0x2e6cf000
read(20, "cpu  8076674 231275 3399085 7254"..., 4096) = 713
read(20, "", 4096)                      = 0
close(20)                               = 0
munmap(0x2e6cf000, 4096)                = 0
uname({sys="Linux", node="rainbow", ...}) = 0
+++ killed by SIGKILL +++


My kernel-version  is 2.4.31, with grsecurity patches (PAX...), perhaps 
it has something to do with that?

I have never used Java on Linux, so perhaps I'm missing something.

It's strange, I can execute "java", but "javac" gets killed somehow.

regards
Andreas