Java Handler Error

[vikrant singh]

Hello,

I am starting with setting up a java handler as explained here 

http://nginx-clojure.github.io/quickstart.html

This is how jvm settings in my config file looks

.

   jvm_path "/home/y/libexec64/jdk64-1.8.0/jre/lib/amd64/server/libjvm.so";

    ### my app jars e.g. clojure-1.5.1.jar , groovy-2.3.4.jar ,etc.

    jvm_var jar_path '/home/y/lib/jars';

    jvm_var base_jar '#{jar_path}/nginx-clojure-0.3.0.jar';

    jvm_var hwService_jar '#{jar_path}/HelloService.jar';

    ###jvm_options can be repeated once per option.

    jvm_options "-Djava.class.path=#{base_jar}:#{hwService_jar}";

I have all the jars in place.

This is how location settings are..

      location /java {

          content_handler_type 'java';

          content_handler_name 'mytest.HelloService';

       }

when I hit /java on my server, I get following error in error.log

2015/04/17 18:29:11 [error] 18331#0: invalid java content_handler code : mytest.HelloService

Exception in thread "main" java.lang.RuntimeException: can not create nginx handler for name : mytest.HelloService

        at nginx.clojure.java.NginxJavaHandlerFactory.newInstance(NginxJavaHandlerFactory.java:33)

        at nginx.clojure.NginxHandlerFactory.fetchHandler(NginxHandlerFactory.java:46)

        at nginx.clojure.NginxClojureRT.registerCode(NginxClojureRT.java:696)

Caused by: java.lang.ClassNotFoundException: mytest.HelloService

        at java.net.URLClassLoader$1.run(URLClassLoader.java:372)

        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

        at java.security.AccessController.doPrivileged(Native Method)

        at java.net.URLClassLoader.findClass(URLClassLoader.java:360)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

        at nginx.clojure.java.NginxJavaHandlerFactory.newInstance(NginxJavaHandlerFactory.java:23)

        ... 2 more

2015/04/17 18:30:11 [error] 18331#0: invalid java content_handler code : mytest.HelloService

Not sure whats wrong here, 

Any help?

Best Regards,

Vikrant

[Yuexiang Zhang]

Hi, It seems that nginx-clojure can not find mytest.HelloService  
in the classpath.

Regards.

Xfeep

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[Yuexiang Zhang]

Hi, If your classpath is right, please make sure that the user of nginx workers has enough permissions to access all jars in the classpath.

Regards.

Xfeep

[vikrant singh]

Thanks for reply... You guessed it right. It was an issue with jar file. I was not packaging it correct. It is working correct now.

Another problem  where I was wondering if I can ask you for advise is,  using this framework in a reverse proxy setup. 

Is there a way I can use your framework.. along with "proxy_pass" config?

I need to use nginx as a reverse proxy. For each incoming request I need to look up in a service directory setup (which have a java interface) for service instance. I want to use your framework to do this lookup and then use the fetched information to populate proxy_pass.

Thanks,

Vikrant

[Yuexiang Zhang]

Hi, 

Please try 

(1) use rewrite handler to set some nginx vars

(2) use proxy_pass  with nginx vars

(3) use proxy_set_header with nginx vars

Regards.

Xfeep

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[Roman Woronowicz]

Hi Vikrant,

Many versions later and I'm running into the same problem. It's such an obvious problem with, I'm certain, a simple fix.

You mentioned that you had an issue with your jar file -- packaged incorrectly. What did you encounter and how did you fix it?

Thank you,

Roman

[Roman Woronowicz]

I'm also running nginx as "root" to rule out any access issues.

Give my recent spat of luck in uncovering/encountering odd issues -- lol -- this would probably turn out to be something related to running a 32-bit JVM.

[Yuexiang Zhang]

Hi, Roman,

If you run nginx with root, by default nginx will use the user named "nobody" to create nginx worker process where nginx-clojure runs in.

So please make sure nginx worker process have enough permission to access these java jar files.

Regards.

Xfeep 

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