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By: jimpo
I am trying to use my own RequestHelper, RequestHelperFactory, and Href
implementation to make each link call a Javascript function (I recently found
out that I _might_ be able to solve the problem by using paging.banner.page.link
property, but would like to know the answer to this anyhow...). I use a .war
packet for my application:
war:
WEB-INF\lib\displaytag-1.0-rc2.jar
WEB-INF\classes\com\some\display\MyRequestHelper.class
WEB-INF\classes\com\some\display\MyRequestHelperFactory.class
WEB-INF\classes\com\some\display\MyHref.class
META-INF\Manifest.mf: ...Class-Path: some.jar, displaytag-1.0-rc2.jar
WEB-INF\classes\displaytag.properties:
...factory.requestHelper=com.some.display.MyRequestHelperFactory.class
but, when page tries to get drawn, I get a class loading problem:
java.lang.NoClassDefFoundError: org/displaytag/util/RequestHelperFactory
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at
weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLo
ader.java:476)
at
weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.
java:181)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at java.lang.ClassLoader.loadClass(ClassLoader.java:282)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at
weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.
java:223)
at
weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClas
sLoader.java:41)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at org.displaytag.util.ReflectHelper.classForName(ReflectHelper.java:43)
at
org.displaytag.properties.TableProperties.getClassPropertyInstance(TableProp
erties.java:1078)
at
org.displaytag.properties.TableProperties.getRequestHelperFactoryInstance(Ta
bleProperties.java:965)
at org.displaytag.tags.TableTag.initParameters(TableTag.java:731)
at org.displaytag.tags.TableTag.doStartTag(TableTag.java:620)
at org.displaytag.tags.el.ELTableTag.doStartTag(ELTableTag.java:320)
at jsp_servlet._some._page.__subpage._jspService(exceptions.jsp:56)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(Servle
tStubImpl.java:996)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:419)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:315)
at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(W
ebAppServletContext.java:6452)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubjec
t.java:321)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:3661)
at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2630)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
(using WebLogic 8.1 here). Actually that .war is still contained inside an .ear,
but I do not see how that could affect the problem. Displaytag works fine as
long as I do not use my own custom RequestHelper implementation.
I get the _feeling_ that J2EE classloading is able to locate displaytag classes
using displaytag.jar classloader, displaytag classes locate my custom
requesthelper
using their parent classloader (.war classloader), but my custom requesthelper
classes do not see the displaytag classes, since .war classloader cannot see
it's child classloader's (displaytag.jar classloader) classes. But I am not
sure whether I got the picture correctly....
Any tips on how to properly use custom requesthelper implementations?
Preferrably
so, that I can keep my custom classes part of the .war classes and do not have
to modify the displaytag distribution jar?
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