java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory

Question

I am getting the error as mentioned below, while running the feed utility. I am trying to load an image "logo.png". The slf4j jar file is also available in the runtime classpath. But still I am getting this error.

Oct 16, 2012 7:34:11 PM com.ibm.commerce.foundation.dataload.FeedRetriever  invokeDataLoad
SEVERE: An error occurred while performing data load.
Throwable occurred: com.ibm.commerce.foundation.dataload.exception.DataLoadException: 
An error occurred while executing the data load. 

java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory

    at com.ibm.commerce.foundation.dataload.DataLoaderMain.execute(DataLoaderMain.java:664)
    at com.ibm.commerce.content.commands.DataLoadInvoker.execute(DataLoadInvoker.java:101)
    at com.ibm.commerce.foundation.dataload.FeedRetriever.invokeDataLoad(FeedRetriever.java:244)
    at com.ibm.commerce.foundation.dataload.FeedRetriever.execute(FeedRetriever.java:172)
    at com.ibm.commerce.foundation.dataload.FeedRetriever.main(FeedRetriever.java:321)
Caused by: java.lang.RuntimeException: java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory
    at com.ibm.commerce.foundation.dataload.DataLoaderMain.execute(DataLoaderMain.java:488)
    ... 4 more
Caused by: java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory
    at org.apache.wink.client.ClientConfig.<clinit>(ClientConfig.java:52)
    at java.lang.J9VMInternals.initializeImpl(Native Method)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:167)
    at com.ibm.commerce.foundation.dataload.feedreader.AtomReader.getFeed(AtomReader.java:104)
    at com.ibm.commerce.foundation.dataload.feedreader.AtomReader.getEntries(AtomReader.java:147)
    at com.ibm.commerce.foundation.dataload.feedreader.AtomReader.getEntries(AtomReader.java:1)
    at com.ibm.commerce.foundation.dataload.feedreader.BaseFeedReader.init(BaseFeedReader.java:252)
    at com.ibm.commerce.foundation.dataload.AbstractBusinessObjectLoader.initializeDataReaders(AbstractBusinessObjectLoader.java:1344)
    at com.ibm.commerce.foundation.dataload.AbstractBusinessObjectLoader.init(AbstractBusinessObjectLoader.java:369)
    at com.ibm.commerce.foundation.dataload.BusinessObjectLoader.init(BusinessObjectLoader.java:65)
    at com.ibm.commerce.foundation.dataload.DataLoaderMain.execute(DataLoaderMain.java:431)
    ... 4 more
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
    at java.lang.ClassNotFoundException.<init>(ClassNotFoundException.java:76)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:396)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:660)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:358)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:626)
    ... 16 more
Oct 16, 2012 7:34:11 PM com.ibm.commerce.foundation.dataload.FeedRetriever main
SEVERE: An error occurred while performing data load.
Throwable occurred: com.ibm.commerce.foundation.dataload.exception.DataLoadException: An error has occurred.  If this problem persists, contact product support.
    at com.ibm.commerce.foundation.dataload.FeedRetriever.invokeDataLoad(FeedRetriever.java:247)
    at com.ibm.commerce.foundation.dataload.FeedRetriever.execute(FeedRetriever.java:172)
    at com.ibm.commerce.foundation.dataload.FeedRetriever.main(FeedRetriever.java:321)

Answer 1

Add a SLF4J implementation (as you only have its API):

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.26</version>
</dependency>