org.apache.wink.server.internal.RequestProcessor logException ObjectCreationException (500 - Internal Server Error) occurred during the handlers chain invocation

As the name suggests this error is created while apache wink tries to create an object and it fails. The error is not clear but if you log the debug statements present in wink libraries, the thing will become crystal clear to you.

Here what happens when you start logging wink activities. This clearly shows that you are missing class "org.apache.poi.ss.usermodel.Workbook". This is contained in Apache poi library and you are missing this jar file. Apache wink depends on few more libraries, so if you see this error, enable logging on wink and find out the missing jar,

org.apache.wink.server.internal.RequestProcessor logException ObjectCreationException (500 - Internal Server Error) occurred during the handlers chain invocation
                                 org.apache.wink.common.internal.lifecycle.ObjectCreationException: java.lang.NoClassDefFoundError: org.apache.poi.ss.usermodel.Workbook
    at org.apache.wink.common.internal.lifecycle.CreationUtils.createObject(CreationUtils.java:72)
    at org.apache.wink.common.internal.lifecycle.PrototypeObjectFactory.getInstance(PrototypeObjectFactory.java:45)
    at org.apache.wink.server.internal.registry.ResourceInstance.getInstance(ResourceInstance.java:80)
    at org.apache.wink.server.internal.handlers.InvokeMethodHandler.handleRequest(InvokeMethodHandler.java:41)
    at org.apache.wink.server.handlers.AbstractHandler.handleRequest(AbstractHandler.java:33)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:61)
    at org.apache.wink.server.internal.handlers.CreateInvocationParametersHandler.handleRequest(CreateInvocationParametersHandler.java:48)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:61)
    at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleSubResourceMethod(FindResourceMethodHandler.java:178)
    at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleRequest(FindResourceMethodHandler.java:105)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:61)
    at org.apache.wink.server.internal.handlers.FindRootResourceHandler.handleRequest(FindRootResourceHandler.java:93)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:61)
    at org.apache.wink.server.internal.handlers.HeadMethodHandler.handleRequest(HeadMethodHandler.java:53)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:61)
    at org.apache.wink.server.internal.handlers.OptionsMethodHandler.handleRequest(OptionsMethodHandler.java:46)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:61)
    at org.apache.wink.server.internal.handlers.SearchResultHandler.handleRequest(SearchResultHandler.java:33)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:61)
    at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:48)
    at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:157)
    at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:133)
    at org.apache.wink.server.internal.servlet.RestServlet.service(RestServlet.java:109)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
    at com.ibm.websphere.jaxrs.server.IBMRestServlet.service(IBMRestServlet.java:45)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1661)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1602)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:149)
    at com.filenet.ae.toolkit.server.servlet.filter.PostprocessorFilter.doFilter(PostprocessorFilter.java:38)
    at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:125)
    at com.filenet.ae.toolkit.server.servlet.filter.ContainerBasedFilter.doFilter(ContainerBasedFilter.java:228)
    at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:125)
    at com.filenet.ae.toolkit.server.servlet.filter.PreprocessorFilter.doFilter(PreprocessorFilter.java:118)
    at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:125)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:80)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:908)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:507)
    at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:181)
    at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3994)
    at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:945)
    at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1592)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:191)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:453)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:515)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:306)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:277)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.determineNextChannel(SSLConnectionLink.java:1049)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink$MyReadCompletedCallback.complete(SSLConnectionLink.java:643)
    at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1818)
    at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)
    at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
    at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
    at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
    at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
    at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
    at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1660)
Caused by: java.lang.NoClassDefFoundError: org.apache.poi.ss.usermodel.Workbook
    at java.lang.J9VMInternals.verifyImpl(Native Method)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:73)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:135)
    at com.att.whsd.rest.resource.InbasketTaskList.<init>(InbasketTaskList.java:51)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:56)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:39)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:527)
    at org.apache.wink.common.internal.lifecycle.CreationUtils.createObject(CreationUtils.java:62)
    ... 76 more
Caused by: java.lang.ClassNotFoundException: org.apache.poi.ss.usermodel.Workbook
    at java.net.URLClassLoader.findClass(URLClassLoader.java:434)
    at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:201)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:677)
    at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:112)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:643)
    at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:62)
    at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:58)
    at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:511)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:643)
    at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:511)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:643)

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