Forum OpenACS Q&A: nsjk2 module

I used nsjk2 and got tomcat working within AS4, but the installation was painful and unfortunately not documented. I never used nsjk2 to call tcl API from within Java, but simply to run existing apps within AS4.<p> I used soap-gateway in several projects, both providing web services from OpenACS and accessing third party services via some client tcl procs.<br>Actually these client procs are not well engineered and I had to hack them to deal with different web services. <p>I have no time now, but I think that, without resorting to java, it could be possible to exploit the much better engineered client procs of tclsoap.

Hi Dossy,

I managed to compile nsjk2. However when I startup the openacs config.tcl file with the extras needed to configure nsjk2, I get the following error in the log file...

[14/Dec/2004:14:07:26][3272.16384][-main-] Notice: modload: loading '/usr/local/aolserver/bin/nsjk2.so'
[14/Dec/2004:14:07:26][3272.16384][-main-] Notice: nsjk2: initialized nsjk2 environment
[14/Dec/2004:14:07:26][3272.16384][-main-] Notice: modload: loading '/usr/local/aolserver/bin/nsjavatclbridge.so'
[14/Dec/2004:14:07:26][3272.16384][-main-] Notice: nsjavatclbridge initializing
[14/Dec/2004:14:07:26][3272.16384][-main-] Notice: nsjk2: initialized on 'openacs'
[14/Dec/2004:14:07:26][3272.16384][-main-] Error: Ns_GetJvmEnv: global JVM handle is NULL.
[14/Dec/2004:14:07:26][3272.16384][-main-] Error: Ns_Jk2AddJavaCmds: Unable to access JVM
[14/Dec/2004:14:07:26][3272.16384][-main-] Error:

The settings in my config file for nsjk2 are...

# nsjk2 configuration

ns_section ns/module/nsjk2
ns_param serverroot $env(TOMCAT_HOME)

ns_section ns/server/${server}/modules
ns_param nsjk2 ${bindir}/nsjk2.so

ns_section ns/server/${servername}/module/nsjk2/gzip
ns_param enabled on
ns_param level 4
ns_param minsize 0

ns_section ns/server/${server}/module/nsjk2/utils
ns_param nsjavatclbridge ${bindir}/nsjavatclbridge.so

# -------------------------------------------------------

Would you know why the jvmGLOBAL variable isn't being assigned a jvm instance?

Thanks,
Nick.

I set the JAVA_HOME variable as follows:

sudo /usr/bin/env -i JAVA_HOME=/usr/local/j2sdk1.4.2_04 TOMCAT_HOME=/usr/local/tomcat LD_LIBRARY_PATH=/usr/local/tomcat/lib:/usr/local/j2sdk1.4.2_04/jre/lib/i386:/usr/local/j2sdk1.4.2_04/jre/lib/i386/server /usr/local/aolserver/bin/nsd -ft /usr/local/aolserver/sample-config.tcl -u ncarroll -g web

I don't think the paths are the problem.

Nick

I had the nsjk2 module running in openacs a few months back as a possible way of introducing some legacy Java code. I didn't go much further than running up the Tomcat samples but it did work.

Looking at your config settings I notice mine was a little simpler. It might help if you cut down the settings to the minimum and try that. Specifically I just had:

ns_section ns/server/${server}/modules
ns_param nsjk2 ${bindir}/nsjk2.so

ns_section "ns/module/nsjk2"
ns_param serverRoot /usr/local/tomcat
ns_param loggerName aolserver

ns_section "ns/server/${servername}/module/nsjk2"
ns_param serverName "${hostname}"

To simplify your problem its probably worth running Aolserver up outside of OACS with the nsjk2 module loading to see if it works standalone. I used the nsjk2 supplied startup script and had all the verbose settings turned on in the tomcat configs to see what was happening.

- Steve

Hi,

I am looking for a way to talk to java from tcl? Can you recommend any solution?

I found this link for the documentation but it seems broken:
http://www.aolserver.com/docs/nsjk2.pdf

Is anyone using nsjk2 on a productive site? If yes could you post a little snippet on how you talk to tomcat and pass parameters?

Thx