Re: Strange ClassNotFoundException: org.slf4j.Logger

[Joachim Van der Auwera]

I assume slf4j is on the classpath twice...

Thiago HP wrote:

Hi!

I'm having a very strange exception when trying to run a T5
application (www.arsmachina.com.br/project/example):
Error obtaining injected value for field
org.apache.tapestry5.corelib.components.Form.logger:
java.lang.ClassNotFoundException: org.slf4j.Logger
It seems to be a Tapestry classloading issue, as slf4j-api *is* in the
classpath.

At my home, when running from JettyLauncher (modified to run under
Java 6), runs OK. Under Run-Jetty-Run, the exception is thrown.
Running an embedded Jetty at my home, ok, at my work, exception
raised.

Thanks in advance.

Full stack trace:
 java.lang.RuntimeException: java.lang.ClassNotFoundException: caught
an exception while obtaining a class file for
org.apache.tapestry5.corelib.components.Form
        at 
org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl.findClass(ComponentInstantiatorSourceImpl.java:296)
        at 
org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl.findInstantiator(ComponentInstantiatorSourceImpl.java:272)
        at 
$ComponentInstantiatorSource_11ed4d10948.findInstantiator($ComponentInstantiatorSource_11ed4d10948.java)
        at 
org.apache.tapestry5.internal.services.PageElementFactoryImpl.newComponentElement(PageElementFactoryImpl.java:216)
        ... 144 more
Caused by: java.lang.ClassNotFoundException: caught an exception while
obtaining a class file for
org.apache.tapestry5.corelib.components.Form
        at javassist.Loader.findClass(Loader.java:359)
        at 
org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl$PackageAwareLoader.findClass(ComponentInstantiatorSourceImpl.java:92)
        at javassist.Loader.loadClass(Loader.java:311)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at 
org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl.findClass(ComponentInstantiatorSourceImpl.java:292)
        ... 147 more
Caused by: org.apache.tapestry5.internal.services.TransformationException:
Error obtaining injected value for field
org.apache.tapestry5.corelib.components.Form.logger:
java.lang.ClassNotFoundException: org.slf4j.Logger
        at 
org.apache.tapestry5.internal.services.ComponentClassTransformerImpl.transformComponentClass(ComponentClassTransformerImpl.java:176)
        at 
$ComponentClassTransformer_11ed4d10954.transformComponentClass($ComponentClassTransformer_11ed4d10954.java)
        at 
org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl.onLoad(ComponentInstantiatorSourceImpl.java:201)
        at javassist.Loader.findClass(Loader.java:340)
        ... 151 more
Caused by: java.lang.RuntimeException: Error obtaining injected value
for field org.apache.tapestry5.corelib.components.Form.logger:
java.lang.ClassNotFoundException: org.slf4j.Logger
        at 
org.apache.tapestry5.internal.transform.InjectWorker.transform(InjectWorker.java:68)
        at 
$ComponentClassTransformWorker_11ed4d109a4.transform($ComponentClassTransformWorker_11ed4d109a4.java)
        at 
$ComponentClassTransformWorker_11ed4d1099a.transform($ComponentClassTransformWorker_11ed4d1099a.java)
        at 
org.apache.tapestry5.internal.services.ComponentClassTransformerImpl.transformComponentClass(ComponentClassTransformerImpl.java:170)
        ... 154 more
Caused by: java.lang.RuntimeException:
java.lang.ClassNotFoundException: org.slf4j.Logger
        at 
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.toClass(InternalClassTransformationImpl.java:1765)
        at 
org.apache.tapestry5.internal.transform.InjectWorker.transform(InjectWorker.java:55)
        ... 157 more
Caused by: java.lang.ClassNotFoundException: org.slf4j.Logger
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at javassist.Loader.delegateToParent(Loader.java:428)
        at javassist.Loader.loadClass(Loader.java:314)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at 
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.toClass(InternalClassTransformationImpl.java:1761)

--
Joachim Van der Auwera
PROGS bvba, progs.be


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