Alexander Klimetschek schrieb:
IMHO this might happen any time again and having the flexibility of
classloading in Java is perfect for solving those problems. I have
implemented that shielded groups stuff in the old
BootstrapClassLoaderManager, right now, I am writing on a
ShieldingBlockServlet as a proof of concept and to be up-to-date with
the cocoon trunk.
The new ShieldingBlockServlet works except for one annoying thing: when
serving JSPs I get this exception:
java.lang.ClassCastException:
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
(see full stacktrace below at the end of the mail).
This actually worked before when I used the shielding classloading stuff
from cocoon-bootstrap, i.e. exactly the same shielded classloading code
as used for the shielding of cocoon, only with an additional lib/
directory inside the block.
Now I have a ShieldingBlockServlet which is like the current
o.a.c.maven.deployer.servlet.ShieldingServlet and it uses the
o.a.c.classloader.DefaultClassLoader, which is setup only with lib and
classes directory from the block (well, this might be different to the
previous case, where also the standard WEB-INF/lib etc. were set, but
IIRC they couldn't be found anyway, since they were looked up from the
BlockContext).
The classloader hierarchy also seems to be ok, my DefaultClassLoader has
the o.a.c.maven.deployer.servlet.ShieldedClassLoader as parent and that
one has the WebappClassLoader as its parent.
With a look at Carsten ;-), what could be wrong?
Alex
The full stacktrace:
java.lang.ClassCastException:
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
at
javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:98)
at
org.apache.jasper.xmlparser.ParserUtils.parseXMLDocument(ParserUtils.java:188)
at
org.apache.jasper.compiler.JspConfig.processWebDotXml(JspConfig.java:110)
at org.apache.jasper.compiler.JspConfig.init(JspConfig.java:282)
at
org.apache.jasper.compiler.JspConfig.findJspProperty(JspConfig.java:347)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:220)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:620)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:602)
at
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:618)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:440)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.cocoon.components.jsp.JSPEngineImpl.executeJSP(JSPEngineImpl.java:74)
at org.apache.cocoon.reading.JSPReader.generate(JSPReader.java:115)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.cocoon.core.container.spring.avalon.PoolableFactoryBean$ProxyHandler.invoke(PoolableFactoryBean.java:349)
at $Proxy5.generate(Unknown Source)
at
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processReader(AbstractProcessingPipeline.java:649)
at
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline.java:429)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.cocoon.core.container.spring.avalon.PoolableFactoryBean$ProxyHandler.invoke(PoolableFactoryBean.java:349)
at $Proxy4.process(Unknown Source)
at
org.apache.cocoon.components.treeprocessor.sitemap.ReadNode.invoke(ReadNode.java:94)
at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:55)
at
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:87)
at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:77)
at
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:152)
at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:77)
at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:93)
at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:239)
at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:170)
at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:232)
at
org.apache.cocoon.servlet.RequestProcessor.process(RequestProcessor.java:397)
at
org.apache.cocoon.servlet.RequestProcessor.service(RequestProcessor.java:162)
at
org.apache.cocoon.sitemap.SitemapServlet.service(SitemapServlet.java:61)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContext.java:529)
at
org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContext.java:511)
at
org.apache.cocoon.blocks.ShieldingBlockServlet.service(ShieldingBlockServlet.java:136)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.cocoon.blocks.DispatcherServlet.service(DispatcherServlet.java:127)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.cocoon.maven.deployer.servlet.ShieldingServlet.service(ShieldingServlet.java:95)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:445)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1050)
at
com.mindquarry.webapp.servlet.AuthenticationFilter.doFilter(AuthenticationFilter.java:216)
at
org.apache.cocoon.maven.deployer.servlet.ShieldingServletFilter.doFilter(ShieldingServletFilter.java:50)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1041)
at
org.apache.cocoon.servlet.multipart.MultipartFilter.doFilter(MultipartFilter.java:104)
at
org.apache.cocoon.maven.deployer.servlet.ShieldingServletFilter.doFilter(ShieldingServletFilter.java:50)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1041)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:354)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:226)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:627)
at
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:149)
at
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:123)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:141)
at org.mortbay.jetty.Server.handle(Server.java:269)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:430)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:687)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:492)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:199)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:339)
at
org.mortbay.jetty.nio.HttpChannelEndPoint.run(HttpChannelEndPoint.java:270)
at
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)
--
Alexander Klimetschek
http://www.mindquarry.com
