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Posted to java-user@axis.apache.org by Edward Blazer <5....@gmail.com> on 2006/01/15 06:24:12 UTC
ClassLoader NPE
Hi,
I've googled the topic to death but can't find a solution to the infamous
NullPointerException caused by Axis/Commons-Discovery during a servlet
restart (error occurs for many different vendors; jboss, jetty, others?) My
application has an embedded server (jetty) for serving Axis WebServices, but
also acts as a client of web-services. I've discovered that if I remove the
Axis libraries from the applications classpath that it can restart without
error, however this causes a problem when the application tries to consume
web-services since Axis isn't in the classpath.
Any ideas?
Thanks
java.lang.NullPointerException
at org.mortbay.http.ContextLoader.getResource(ContextLoader.java:257)
at org.apache.commons.discovery.jdk.JDK12Hooks.getResources (
JDK12Hooks.java :149)
at
org.apache.commons.discovery.resource.DiscoverResources$1.getNextResources(
DiscoverResources.java:153)
at
org.apache.commons.discovery.resource.DiscoverResources$1.getNextResource(
DiscoverResources.java :129)
at org.apache.commons.discovery.resource.DiscoverResources$1.hasNext(
DiscoverResources.java:116)
at
org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassNames
(DiscoverNamesInFile.java :186)
at
org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassName
(DiscoverNamesInFile.java:170)
at
org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.hasNext(
DiscoverNamesInFile.java :157)
at
org.apache.commons.discovery.resource.names.NameDiscoverers$1.getNextIterator
(NameDiscoverers.java:143)
at org.apache.commons.discovery.resource.names.NameDiscoverers$1.hasNext
(NameDiscoverers.java :126)
at
org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.getNextResource
(ResourceClassDiscoverImpl.java:159)
at
org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.hasNext(
ResourceClassDiscoverImpl.java:147)
at org.apache.axis.configuration.EngineConfigurationFactoryFinder$1.run(
EngineConfigurationFactoryFinder.java:120)
at java.security.AccessController.doPrivileged(Native Method)
at
org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(
EngineConfigurationFactoryFinder.java:113)
at org.apache.axis.transport.http.AxisServletBase.getEngineEnvironment(
AxisServletBase.java :273)
at org.apache.axis.transport.http.AxisServletBase.getEngine(
AxisServletBase.java:172)
at org.apache.axis.transport.http.AxisServletBase.getOption(
AxisServletBase.java:396)
at org.apache.axis.transport.http.AxisServletBase.init (
AxisServletBase.java:112)
at javax.servlet.GenericServlet.init(GenericServlet.java:168)
at org.mortbay.jetty.servlet.ServletHolder.initServlet(
ServletHolder.java:383)
at org.mortbay.jetty.servlet.ServletHolder.start (ServletHolder.java
:243)
at org.mortbay.jetty.servlet.ServletHandler.initializeServlets(
ServletHandler.java:446)
at org.mortbay.jetty.servlet.WebApplicationHandler.initializeServlets(
WebApplicationHandler.java :321)
at org.mortbay.jetty.servlet.WebApplicationContext.doStart(
WebApplicationContext.java:509)
at org.mortbay.util.Container.start(Container.java:72)
at org.mortbay.http.HttpServer.doStart(HttpServer.java :708)
at org.mortbay.util.Container.start(Container.java:72)
at JettyTest2.start(JettyTest2.java:35)
at JettyTest2.testDoubleStartStop(JettyTest2.java:30)
at JettyTest2.main(JettyTest2.java:22)
Re: ClassLoader NPE
Posted by Davanum Srinivas <da...@gmail.com>.
Great!!! Could u please log a bug in JIRA?
thanks,
dims
On 1/15/06, Edward Blazer <5....@gmail.com> wrote:
> Dims,
>
> Great idea. I did just that and it worked for the most part, but I also had
> to tweak ClassLoaders.java around line 46.
>
> public ClassLoader get(int idx) {
> ClassLoader cl =
> (ClassLoader)classLoaders.elementAt(idx);
> try {
> cl.toString();
> return cl;
> } catch (NullPointerException e) {
> return
> Thread.currentThread().getContextClassLoader().getParent();
> }
> }
>
> It seems that the vector of ClassLoader's had a reference to the ClassLoader
> that was used for the containers first deployment, but when the container
> was stopped, that classLoader should have been thrown away. So, on
> redeployment, this method would return that old classloader which wasn't
> null, but also didn't work. i.e. (cl == null) would return false, but
> cl.toString() would throw the NPE for the 'dead' reference (is there a
> better term for this?). Anyway, it's not pretty, but it works for my needs.
>
> Thanks!
>
>
> On 1/15/06, Davanum Srinivas <da...@gmail.com> wrote:
> > Please get the latest sources for commons-discovery and build it
> > yourself to see if that works. I remember some check-ins, but don't
> > remember if there was a release after that.
> >
> > thanks,
> > dims
> >
> > On 1/15/06, Edward Blazer < 5.10madness@gmail.com> wrote:
> > > Hi,
> > >
> > > I've googled the topic to death but can't find a solution to the
> infamous
> > > NullPointerException caused by Axis/Commons-Discovery during a servlet
> > > restart (error occurs for many different vendors; jboss, jetty, others?)
> My
> > > application has an embedded server (jetty) for serving Axis WebServices,
> but
> > > also acts as a client of web-services. I've discovered that if I remove
> the
> > > Axis libraries from the applications classpath that it can restart
> without
> > > error, however this causes a problem when the application tries to
> consume
> > > web-services since Axis isn't in the classpath.
> > >
> > > Any ideas?
> > >
> > > Thanks
> > >
> > > java.lang.NullPointerException
> > > at
> > >
> org.mortbay.http.ContextLoader.getResource(ContextLoader.java:257)
> > > at
> > >
> org.apache.commons.discovery.jdk.JDK12Hooks.getResources
> > > (JDK12Hooks.java :149)
> > > at
> > >
> org.apache.commons.discovery.resource.DiscoverResources$1.getNextResources(DiscoverResources.java:153)
> > > at
> > >
> org.apache.commons.discovery.resource.DiscoverResources$1.getNextResource
> (DiscoverResources.java
> > > :129)
> > > at
> > >
> org.apache.commons.discovery.resource.DiscoverResources$1.hasNext(DiscoverResources.java:116)
> > > at
> > >
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassNames
> (DiscoverNamesInFile.java
> > > :186)
> > > at
> > >
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassName(DiscoverNamesInFile.java:170)
> > > at
> > >
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.hasNext
> (DiscoverNamesInFile.java
> > > :157)
> > > at
> > >
> org.apache.commons.discovery.resource.names.NameDiscoverers$1.getNextIterator(NameDiscoverers.java:143)
> > > at
> > >
> org.apache.commons.discovery.resource.names.NameDiscoverers$1.hasNext
> (NameDiscoverers.java
> > > :126)
> > > at
> > >
> org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.getNextResource(ResourceClassDiscoverImpl.java:159)
> > > at
> > >
> org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.hasNext
> > > (ResourceClassDiscoverImpl.java:147)
> > > at
> > >
> org.apache.axis.configuration.EngineConfigurationFactoryFinder$1.run(EngineConfigurationFactoryFinder.java:120)
> > > at java.security.AccessController.doPrivileged
> (Native
> > > Method)
> > > at
> > >
> org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:113)
> > > at
> > >
> org.apache.axis.transport.http.AxisServletBase.getEngineEnvironment
> (AxisServletBase.java
> > > :273)
> > > at
> > >
> org.apache.axis.transport.http.AxisServletBase.getEngine(AxisServletBase.java:172)
> > > at
> > >
> org.apache.axis.transport.http.AxisServletBase.getOption
> (AxisServletBase.java:396)
> > > at
> org.apache.axis.transport.http.AxisServletBase.init
> > > (AxisServletBase.java:112)
> > > at
> > >
> javax.servlet.GenericServlet.init(GenericServlet.java:168)
> > > at
> > >
> org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:383)
> > > at org.mortbay.jetty.servlet.ServletHolder.start
> > > (ServletHolder.java:243)
> > > at
> > >
> org.mortbay.jetty.servlet.ServletHandler.initializeServlets
> (ServletHandler.java:446)
> > > at
> > >
> org.mortbay.jetty.servlet.WebApplicationHandler.initializeServlets(WebApplicationHandler.java
> > > :321)
> > > at
> > > org.mortbay.jetty.servlet.WebApplicationContext.doStart
> (WebApplicationContext.java:509)
> > > at
> org.mortbay.util.Container.start(Container.java:72)
> > > at
> org.mortbay.http.HttpServer.doStart(HttpServer.java
> > > :708)
> > > at org.mortbay.util.Container.start
> (Container.java:72)
> > > at JettyTest2.start(JettyTest2.java:35)
> > > at JettyTest2.testDoubleStartStop(JettyTest2.java:30)
> > > at JettyTest2.main(JettyTest2.java:22)
> >
> >
> > --
> > Davanum Srinivas : http://wso2.com/blogs/
> >
>
>
--
Davanum Srinivas : http://wso2.com/blogs/
Re: ClassLoader NPE
Posted by Edward Blazer <5....@gmail.com>.
Dims,
Great idea. I did just that and it worked for the most part, but I also had
to tweak ClassLoaders.java around line 46.
public ClassLoader get(int idx) {
ClassLoader cl = (ClassLoader)classLoaders.elementAt(idx);
try {
cl.toString();
return cl;
} catch (NullPointerException e) {
return Thread.currentThread
().getContextClassLoader().getParent();
}
}
It seems that the vector of ClassLoader's had a reference to the ClassLoader
that was used for the containers first deployment, but when the container
was stopped, that classLoader should have been thrown away. So, on
redeployment, this method would return that old classloader which wasn't
null, but also didn't work. i.e. (cl == null) would return false, but
cl.toString() would throw the NPE for the 'dead' reference (is there a
better term for this?). Anyway, it's not pretty, but it works for my needs.
Thanks!
On 1/15/06, Davanum Srinivas <da...@gmail.com> wrote:
>
> Please get the latest sources for commons-discovery and build it
> yourself to see if that works. I remember some check-ins, but don't
> remember if there was a release after that.
>
> thanks,
> dims
>
> On 1/15/06, Edward Blazer <5....@gmail.com> wrote:
> > Hi,
> >
> > I've googled the topic to death but can't find a solution to the
> infamous
> > NullPointerException caused by Axis/Commons-Discovery during a servlet
> > restart (error occurs for many different vendors; jboss, jetty, others?)
> My
> > application has an embedded server (jetty) for serving Axis WebServices,
> but
> > also acts as a client of web-services. I've discovered that if I remove
> the
> > Axis libraries from the applications classpath that it can restart
> without
> > error, however this causes a problem when the application tries to
> consume
> > web-services since Axis isn't in the classpath.
> >
> > Any ideas?
> >
> > Thanks
> >
> > java.lang.NullPointerException
> > at
> > org.mortbay.http.ContextLoader.getResource(ContextLoader.java:257)
> > at
> > org.apache.commons.discovery.jdk.JDK12Hooks.getResources
> > (JDK12Hooks.java :149)
> > at
> >
> org.apache.commons.discovery.resource.DiscoverResources$1.getNextResources
> (DiscoverResources.java:153)
> > at
> >
> org.apache.commons.discovery.resource.DiscoverResources$1.getNextResource(
> DiscoverResources.java
> > :129)
> > at
> > org.apache.commons.discovery.resource.DiscoverResources$1.hasNext(
> DiscoverResources.java:116)
> > at
> >
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassNames
> (DiscoverNamesInFile.java
> > :186)
> > at
> >
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassName
> (DiscoverNamesInFile.java:170)
> > at
> >
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.hasNext(
> DiscoverNamesInFile.java
> > :157)
> > at
> >
> org.apache.commons.discovery.resource.names.NameDiscoverers$1.getNextIterator
> (NameDiscoverers.java:143)
> > at
> > org.apache.commons.discovery.resource.names.NameDiscoverers$1.hasNext(
> NameDiscoverers.java
> > :126)
> > at
> >
> org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.getNextResource
> (ResourceClassDiscoverImpl.java:159)
> > at
> >
> org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.hasNext
> > (ResourceClassDiscoverImpl.java:147)
> > at
> > org.apache.axis.configuration.EngineConfigurationFactoryFinder$1.run(
> EngineConfigurationFactoryFinder.java:120)
> > at java.security.AccessController.doPrivileged(Native
> > Method)
> > at
> >
> org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(
> EngineConfigurationFactoryFinder.java:113)
> > at
> > org.apache.axis.transport.http.AxisServletBase.getEngineEnvironment(
> AxisServletBase.java
> > :273)
> > at
> > org.apache.axis.transport.http.AxisServletBase.getEngine(
> AxisServletBase.java:172)
> > at
> > org.apache.axis.transport.http.AxisServletBase.getOption(
> AxisServletBase.java:396)
> > at org.apache.axis.transport.http.AxisServletBase.init
> > (AxisServletBase.java:112)
> > at
> > javax.servlet.GenericServlet.init(GenericServlet.java:168)
> > at
> > org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java
> :383)
> > at org.mortbay.jetty.servlet.ServletHolder.start
> > (ServletHolder.java:243)
> > at
> > org.mortbay.jetty.servlet.ServletHandler.initializeServlets(
> ServletHandler.java:446)
> > at
> > org.mortbay.jetty.servlet.WebApplicationHandler.initializeServlets(
> WebApplicationHandler.java
> > :321)
> > at
> > org.mortbay.jetty.servlet.WebApplicationContext.doStart(
> WebApplicationContext.java:509)
> > at org.mortbay.util.Container.start(Container.java:72)
> > at org.mortbay.http.HttpServer.doStart(HttpServer.java
> > :708)
> > at org.mortbay.util.Container.start(Container.java:72)
> > at JettyTest2.start(JettyTest2.java:35)
> > at JettyTest2.testDoubleStartStop(JettyTest2.java:30)
> > at JettyTest2.main(JettyTest2.java:22)
>
>
> --
> Davanum Srinivas : http://wso2.com/blogs/
>
Re: ClassLoader NPE
Posted by Davanum Srinivas <da...@gmail.com>.
Please get the latest sources for commons-discovery and build it
yourself to see if that works. I remember some check-ins, but don't
remember if there was a release after that.
thanks,
dims
On 1/15/06, Edward Blazer <5....@gmail.com> wrote:
> Hi,
>
> I've googled the topic to death but can't find a solution to the infamous
> NullPointerException caused by Axis/Commons-Discovery during a servlet
> restart (error occurs for many different vendors; jboss, jetty, others?) My
> application has an embedded server (jetty) for serving Axis WebServices, but
> also acts as a client of web-services. I've discovered that if I remove the
> Axis libraries from the applications classpath that it can restart without
> error, however this causes a problem when the application tries to consume
> web-services since Axis isn't in the classpath.
>
> Any ideas?
>
> Thanks
>
> java.lang.NullPointerException
> at
> org.mortbay.http.ContextLoader.getResource(ContextLoader.java:257)
> at
> org.apache.commons.discovery.jdk.JDK12Hooks.getResources
> (JDK12Hooks.java :149)
> at
> org.apache.commons.discovery.resource.DiscoverResources$1.getNextResources(DiscoverResources.java:153)
> at
> org.apache.commons.discovery.resource.DiscoverResources$1.getNextResource(DiscoverResources.java
> :129)
> at
> org.apache.commons.discovery.resource.DiscoverResources$1.hasNext(DiscoverResources.java:116)
> at
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassNames(DiscoverNamesInFile.java
> :186)
> at
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassName(DiscoverNamesInFile.java:170)
> at
> org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.hasNext(DiscoverNamesInFile.java
> :157)
> at
> org.apache.commons.discovery.resource.names.NameDiscoverers$1.getNextIterator(NameDiscoverers.java:143)
> at
> org.apache.commons.discovery.resource.names.NameDiscoverers$1.hasNext(NameDiscoverers.java
> :126)
> at
> org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.getNextResource(ResourceClassDiscoverImpl.java:159)
> at
> org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.hasNext
> (ResourceClassDiscoverImpl.java:147)
> at
> org.apache.axis.configuration.EngineConfigurationFactoryFinder$1.run(EngineConfigurationFactoryFinder.java:120)
> at java.security.AccessController.doPrivileged(Native
> Method)
> at
> org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:113)
> at
> org.apache.axis.transport.http.AxisServletBase.getEngineEnvironment(AxisServletBase.java
> :273)
> at
> org.apache.axis.transport.http.AxisServletBase.getEngine(AxisServletBase.java:172)
> at
> org.apache.axis.transport.http.AxisServletBase.getOption(AxisServletBase.java:396)
> at org.apache.axis.transport.http.AxisServletBase.init
> (AxisServletBase.java:112)
> at
> javax.servlet.GenericServlet.init(GenericServlet.java:168)
> at
> org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:383)
> at org.mortbay.jetty.servlet.ServletHolder.start
> (ServletHolder.java:243)
> at
> org.mortbay.jetty.servlet.ServletHandler.initializeServlets(ServletHandler.java:446)
> at
> org.mortbay.jetty.servlet.WebApplicationHandler.initializeServlets(WebApplicationHandler.java
> :321)
> at
> org.mortbay.jetty.servlet.WebApplicationContext.doStart(WebApplicationContext.java:509)
> at org.mortbay.util.Container.start(Container.java:72)
> at org.mortbay.http.HttpServer.doStart(HttpServer.java
> :708)
> at org.mortbay.util.Container.start(Container.java:72)
> at JettyTest2.start(JettyTest2.java:35)
> at JettyTest2.testDoubleStartStop(JettyTest2.java:30)
> at JettyTest2.main(JettyTest2.java:22)
--
Davanum Srinivas : http://wso2.com/blogs/