Error when compiling to a servlet

Error when compiling to a servlet

[Ben]

It is not possible to compile a servlet like described in :

http://www.gnu.org/software/kawa/Servlets.html

system: 
- kawa-2.9
- /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
- ubuntu 14.04.1

command:
kawa --servlet -C script.scm 

what works though isa
kawa  -C script.scm and
kawa  --servlet script.scm 

but not the combination of --servlet and -C

script.scm:
(format "The time is <~s>." (java.util.Date))

error:
(compiling script.scm to script)
internal error while compiling script.scm
java.lang.RuntimeException: no such class: gnu.kawa.servlet.KawaServlet
        at gnu.bytecode.ObjectType.getReflectClass(ObjectType.java:122)
        at gnu.bytecode.ClassType.getModifiers(ClassType.java:105)
        at gnu.bytecode.ClassType.isInterface(ClassType.java:522)
        at gnu.bytecode.ClassType.getSuperclass(ClassType.java:426)
        at gnu.bytecode.ClassType.isSubclass(ClassType.java:1348)
        at gnu.bytecode.ClassType.compare(ClassType.java:1380)
        at gnu.bytecode.Type.isSubtype(Type.java:439)
        at gnu.expr.Compilation.generateBytecode(Compilation.java:2048)
        at gnu.expr.Compilation.process(Compilation.java:2001)
        at gnu.expr.ModuleInfo.loadByStages(ModuleInfo.java:290)
        at gnu.expr.ModuleInfo.loadByStages(ModuleInfo.java:272)
        at kawa.repl.compileFiles(repl.java:824)
        at kawa.repl.processArgs(repl.java:444)
        at kawa.repl.main(repl.java:871)
Caused by: java.lang.ClassNotFoundException:
gnu.kawa.servlet.KawaServlet
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:274)
        at gnu.bytecode.ObjectType.getContextClass(ObjectType.java:88)
        at gnu.bytecode.ObjectType.getReflectClass(ObjectType.java:115)
t

Re: Error when compiling to a servlet

[Per Bothner]

On 02/14/2015 08:07 AM, Ben wrote:
> It is not possible to compile a servlet like described in :
>
> http://www.gnu.org/software/kawa/Servlets.html
>
> system:
> - kawa-2.9

There is no "kawa-2.9".  The kawa-2.0.jar that I released
does include gnu/kawa/servlet/KawaServlet.class.  Are you using
some other kawa-XX.jar?  Did you build it yourself?  If so, how?

> - /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
> - ubuntu 14.04.1
>
> command:
> kawa --servlet -C script.scm
>
> what works though isa
> kawa  -C script.scm and
> kawa  --servlet script.scm
>
> but not the combination of --servlet and -C

The --servlet option doesn't do anything without -C, so that makes sense.

Note that you also need the servlet-api.jar (available various places including Tomcat
or Glassfish).  This containss javax/servlet/http/HttpServlet.  However, if you had
gnu/kawa/servlet/KawaServlet but were missing javax/servlet/http/HttpServlet you'd get:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet

So I'm assuming there is a problem with your Kawa installation.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/

Re: Error when compiling to a servlet

[Ben]

thanks, for your quick answer.
> There is no "kawa-2.9".  The kawa-2.0.jar
yes, sorry this was a typo

> Are you using
> some other kawa-XX.jar?  Did you build it yourself? 

yes, I've built it myself and besides this error, it worked well. Now to
make error finding easier I've switched to the precompiled kawa-2.0.jar

> Exception in thread "main" java.lang.NoClassDefFoundError:
> javax/servlet/http/HttpServlet

yup :-)

- i now work with the 2.0.jar version
- I've tried the servlet-api-2.5.jar and the 3.0. version from tomcat 6.
- I've tried to run 'kawa --servlet -C myscript' in various ways like 
  " java -cp ./servlet-api-3.0.jar:/home/ben/local/kawa/kawa/kawa.jar 
  -jar ./kawa.jar --servlet -C script.scm"

but I keep getting the same error::

Exception in thread "main" java.lang.NoClassDefFoundError:
javax/servlet/http/HttpServlet
	at java.lang.ClassLoader.defineClass1(Native Method)
....






On Sat, Feb 14, 2015, at 08:15 PM, Per Bothner wrote:
> 
> 
> On 02/14/2015 08:07 AM, Ben wrote:
> > It is not possible to compile a servlet like described in :
> >
> > http://www.gnu.org/software/kawa/Servlets.html
> >
> > system:
> > - kawa-2.9
> 
> There is no "kawa-2.9".  The kawa-2.0.jar that I released
> does include gnu/kawa/servlet/KawaServlet.class.  Are you using
> some other kawa-XX.jar?  Did you build it yourself?  If so, how?
> 
> > - /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
> > - ubuntu 14.04.1
> >
> > command:
> > kawa --servlet -C script.scm
> >
> > what works though isa
> > kawa  -C script.scm and
> > kawa  --servlet script.scm
> >
> > but not the combination of --servlet and -C
> 
> The --servlet option doesn't do anything without -C, so that makes sense.
> 
> Note that you also need the servlet-api.jar (available various places
> including Tomcat
> or Glassfish).  This containss javax/servlet/http/HttpServlet.  However,
> if you had
> gnu/kawa/servlet/KawaServlet but were missing
> javax/servlet/http/HttpServlet you'd get:
> Exception in thread "main" java.lang.NoClassDefFoundError:
> javax/servlet/http/HttpServlet
> 
> So I'm assuming there is a problem with your Kawa installation.
> -- 
> 	--Per Bothner
> per@bothner.com   http://per.bothner.com/

Re: Error when compiling to a servlet

[Per Bothner]

On 02/16/2015 02:14 AM, Ben wrote:
> thanks, for your quick answer.
>> There is no "kawa-2.9".  The kawa-2.0.jar
> yes, sorry this was a typo
>
>> Are you using
>> some other kawa-XX.jar?  Did you build it yourself?
>
> yes, I've built it myself and besides this error, it worked well. Now to
> make error finding easier I've switched to the precompiled kawa-2.0.jar

Ah.  You need to configure with the flag --with-servlet or
--with-servlet=/path/to/servlet.jar

I'm embarrassed to admit that doesn't appear to be mentioned in the manual. Oops.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/

Re: Error when compiling to a servlet

[Per Bothner]

On 02/16/2015 09:03 AM, Per Bothner wrote:
> Ah.  You need to configure with the flag --with-servlet or
> --with-servlet=/path/to/servlet.jar
>
> I'm embarrassed to admit that doesn't appear to be mentioned in the manual. Oops.

I checked in documentation on using --with-servlet, as well as more information
on other configure options.  (This is only to Subversion doc/kawa.texi; the website
will be updated later, probably when Kawa 2.1 is released.)
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/

Re: Error when compiling to a servlet

[Per Bothner]

On 02/17/2015 02:33 AM, Ben wrote:
> I've tried to run 'kawa --servlet -C myscript' in various ways like
> " java -cp ./servlet-api-3.0.jar:/home/ben/local/kawa/kawa/kawa.jar
> -jar ./kawa.jar --servlet -C script.scm"
>
> but I keep getting the same error::
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> javax/servlet/http/HttpServlet
> at java.lang.ClassLoader.defineClass1(Native Method)

Hm. There does seem to be a problem when using the -jar option.
Not sure what is going on.

However, the following seems to work:

    java -cp /path/to/servlet.jar:/path/to/kawa-2.0.jar kawa.repl --servlet -C script.scm
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/

Re: Error when compiling to a servlet

[Ben]

thanks, the compilation seems to work now.

Next problem : a runtime error when calling the servlet. I don't know
what could be the reason behind, found noting usable on the web,
therefor the whole error.: 
HTTP Status 500 - Error allocating a servlet instance

type Exception report

message Error allocating a servlet instance

description The server encountered an internal error that prevented it
from fulfilling this request.

exception

javax.servlet.ServletException: Error allocating a servlet instance
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	java.lang.Thread.run(Thread.java:745)

root cause

java.lang.NoClassDefFoundError: gnu/expr/RunnableModule
	java.lang.ClassLoader.defineClass1(Native Method)
	java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2854)
	org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1159)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	java.lang.Thread.run(Thread.java:745)

root cause

java.lang.ClassNotFoundException: gnu.expr.RunnableModule
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
	java.lang.ClassLoader.defineClass1(Native Method)
	java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2854)
	org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1159)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	java.lang.Thread.run(Thread.java:745)

note The full stack trace of the root cause is available in the Apache
Tomcat/6.0.39 logs.
Apache Tomcat/6.0.39



On Tue, Feb 17, 2015, at 02:23 PM, Per Bothner wrote:
> 
> 
> On 02/17/2015 02:33 AM, Ben wrote:
> > I've tried to run 'kawa --servlet -C myscript' in various ways like
> > " java -cp ./servlet-api-3.0.jar:/home/ben/local/kawa/kawa/kawa.jar
> > -jar ./kawa.jar --servlet -C script.scm"
> >
> > but I keep getting the same error::
> >
> > Exception in thread "main" java.lang.NoClassDefFoundError:
> > javax/servlet/http/HttpServlet
> > at java.lang.ClassLoader.defineClass1(Native Method)
> 
> Hm. There does seem to be a problem when using the -jar option.
> Not sure what is going on.
> 
> However, the following seems to work:
> 
>     java -cp /path/to/servlet.jar:/path/to/kawa-2.0.jar kawa.repl
>     --servlet -C script.scm
> -- 
> 	--Per Bothner
> per@bothner.com   http://per.bothner.com/

Re: Error when compiling to a servlet

[Per Bothner]

On 02/18/2015 03:09 AM, Ben wrote:
> Next problem : a runtime error when calling the servlet. I don't know
> what could be the reason behind, found noting usable on the web,
> therefor the whole error.:
> HTTP Status 500 - Error allocating a servlet instance
>
> type Exception report
>
> message Error allocating a servlet instance
>
> description The server encountered an internal error that prevented it
> from fulfilling this request.
>
> exception
>
> javax.servlet.ServletException: Error allocating a servlet instance
> ...
> root cause
> java.lang.NoClassDefFoundError: gnu/expr/RunnableModule
> 	java.lang.ClassLoader.defineClass1(Native Method)
...

That to me suggests Tomcat isn't seeing the kawa.jar.

The documentation recommends copying kawa.jar into
   webapps/MYAPP/WEB-INF/lib/kawa.jar
where MYAPP is your web application.  Did you try that?
I just tried it again with apache-tomcat-8.0.18 and it works for me.

You could try some of the examples in kawa-NNN/testsuite/webtest.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/

Kawa servlet updates [was: Error when compiling to a servlet]

[Per Bothner]

I checked in various minor fixes and improvements to the Kawa servlet support.
Nothing major - for example (current-servlet) now works (and returns #!null if not
in the context of a KawaServlet). Also, (resource-url) returns a valid URL even if the file doesn't exist.

You might also try out testsuite/webtest/info/+default+ . This file displays in your browser
a bunch of information on the current request and server.  It works as-is in these 3 contexts:

(1) Self-configuring web scripts, using the JDK 6 built-in HttpServer. See:

http://www.gnu.org/software/kawa/Self-configuring-page-scripts.html

You can try it by running 'make check-server' in the testsuite directory, and
opening http://localhost:8888/info/anything in your browser.

(2) Self-configuring web scripts, using KawaPageServlet in a servlet container
like Tomcat or Glassfish.

(3) Compiled with --servlet and installed in a servlet container
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/