Tapestry should display more understandable error messages when it finds non
component classes inside component/page package
----------------------------------------------------------------------------------------------------------------------------
Key: TAPESTRY-2078
URL: https://issues.apache.org/jira/browse/TAPESTRY-2078
Project: Tapestry
Issue Type: Improvement
Affects Versions: 5.0
Reporter: Priit Karu
Priority: Minor
Currently Tapestry throws confusing error message (stacktrace with
java.lang.NoClassDefFoundError) when putting *non* component classes to the
Tapestry components/pages package and these classes do not follow the same
restrictions as component classes.
For example if there is a value holder class defined within page package or a
sub package inside page package with protected/public variables then
NoClassDefFoundError is thrown. If they are changed to private (like component
classes should) then the error goes away and class is again found;-)
Tapestry application path is org.example.myapp and there is a simple value
object class Test defined (and used inside page Start).
-------------------->>--------------------<code>
package org.example.myapp.pages.test;
public class Test {
protected String test = "blaah";
public String getTest() {
return test;
}
}
-----
package org.example.myapp.pages;
import org.example.myapp.pages.test.Test;
/**
* Start page of application myapp.
*/
public class Start
{
private Test test = new Test();
public Test getTest() {
return test;
}
}
-----
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
<head>
<title>myapp Start Page</title>
</head>
<body>
<h1>myapp Start Page</h1>
<p> ${test.test}. </p>
</body>
</html>
</code>-------------------->>--------------------
Then the following stacktrace is generated:
# java.lang.NoClassDefFoundError
org/example/myapp/pages/test/Test
Stack trace
* org.example.myapp.pages.Start.initializer(Start.java:27)
* org.example.myapp.pages.Start.<init>(Start.java)
* sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
* sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
* sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)
* java.lang.reflect.Constructor.newInstance(Unknown Source)
*
org.apache.tapestry.internal.services.ReflectiveInstantiator.newInstance(ReflectiveInstantiator.java:79)
*
org.apache.tapestry.internal.structure.InternalComponentResourcesImpl.<init>(InternalComponentResourcesImpl.java:70)
*
org.apache.tapestry.internal.structure.ComponentPageElementImpl.<init>(ComponentPageElementImpl.java:528)
*
org.apache.tapestry.internal.structure.ComponentPageElementImpl.<init>(ComponentPageElementImpl.java:572)
*
org.apache.tapestry.internal.services.PageElementFactoryImpl.newRootComponentElement(PageElementFactoryImpl.java:311)
*
org.apache.tapestry.internal.services.PageLoaderProcessor.loadRootComponent(PageLoaderProcessor.java:354)
*
org.apache.tapestry.internal.services.PageLoaderProcessor.loadPage(PageLoaderProcessor.java:339)
*
org.apache.tapestry.internal.services.PageLoaderImpl.loadPage(PageLoaderImpl.java:60)
*
org.apache.tapestry.internal.services.PagePoolImpl.checkout(PagePoolImpl.java:69)
*
org.apache.tapestry.internal.services.RequestPageCacheImpl.get(RequestPageCacheImpl.java:43)
*
org.apache.tapestry.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:55)
*
org.apache.tapestry.internal.services.RootPathDispatcher.dispatch(RootPathDispatcher.java:52)
*
org.apache.tapestry.services.TapestryModule$12.service(TapestryModule.java:905)
* org.example.myapp.services.AppModule$1.service(AppModule.java:92)
*
org.apache.tapestry.internal.services.LocalizationFilter.service(LocalizationFilter.java:43)
*
org.apache.tapestry.services.TapestryModule$2.service(TapestryModule.java:487)
*
org.apache.tapestry.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79)
*
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:94)
*
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:85)
*
org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:77)
*
org.apache.tapestry.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:107)
*
org.apache.tapestry.services.TapestryModule$11.service(TapestryModule.java:888)
* org.apache.tapestry.TapestryFilter.doFilter(TapestryFilter.java:164)
*
org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
*
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:471)
*
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
* org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
*
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633)
* org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
* org.mortbay.http.HttpServer.service(HttpServer.java:909)
* org.mortbay.http.HttpConnection.service(HttpConnection.java:820)
* org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:986)
* org.mortbay.http.HttpConnection.handle(HttpConnection.java:837)
*
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:245)
* org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
* org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
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