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To: cocoon-dev@xml.apache.org
Subject: C2 Error: java.lang.VerifyError
Date: 15 Sep 2000 00:46:10 +0200
Message-ID: <m21yymegnh.fsf@niedermann.bb.bawue.de>
From: Hans Ulrich Niedermann <niedermann@isd.uni-stuttgart.de>
Lines: 57
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Sender: uli@n-dimensional.de

Hi,

I keep getting NPEs with current C2 when requesting any URI within the
C2 webapps URI space. I'm still somewhat confused by the C2
architecture and all this classloader stuff, but the error seems to be
caused by some classloader issues, so the culprit may be some code
that is not finished yet. 

I'm using Linux (Redhat 6.2), Sun JDK 1.2.2, Tomcat 3.1 (via Apache
1.3.12 and Tomcat 3.1 mod_jserv, but that doesn't make any
difference). If I remember correctly, this should meet all
requirements for C2. Or should I better switch to Tomcat 4, JDK 1.3,
whatever... in order to run C2? 

The console Tomcat runs on says:

java.lang.VerifyError: (class: org/apache/cocoon/serialization/XMLSerializer, method: setOutputStream signature: (Ljava/io/OutputStream;)V) Incompatible object argument for function call
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:120)
        at org.apache.cocoon.util.ClassUtils.loadClass(ClassUtils.java:45)
        at org.apache.cocoon.util.ClassUtils.newInstance(ClassUtils.java:33)
        at org.apache.cocoon.sitemap.AbstractSitemap.load_component(AbstractSitemap.java:83)
        at _home._uli._public_html._xml_isd_uni_stuttgart_de._software._dist._tomcat._webapps._cocoon2._sitemap_xmap.setConfiguration(_sitemap_xmap.java:852)
        at org.apache.cocoon.sitemap.SitemapHandler.run(SitemapHandler.java:149)
        at java.lang.Thread.run(Thread.java:475)

And after that the following stacktrace appears on the Tomcat console
and on the HTML page:

java.lang.NullPointerException: 
        at org.apache.cocoon.sitemap.SitemapHandler.process(SitemapHandler.java:127)
        at org.apache.cocoon.sitemap.SitemapManager.invoke(SitemapManager.java:80)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:212)
        at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:184)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
        at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:156)
        at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
        at java.lang.Thread.run(Thread.java:475)

The following is the corresponding code fragment from _sitemap_xmap.java:

848:  confBuilder.endDocument ();
849:  cconf = confBuilder.getConfiguration();
850:  serializer_config_xml = cconf;
851:  serializer_xml =
852:    (Serializer) load_component ("org.apache.cocoon.serialization.XMLSerializer", cconf);
853:
854:  confBuilder.startDocument ();
855:
856:  confBuilder.startPrefixMapping("","http://apache.org/cocoon/sitemap/1.0");

All C2 lib/*.jar files are symlinked into tomcat/lib and in the
classpath of the VM running Tomcat.

Uli