During my first experiments with my new toolkit based on WCS v8 mod pack1, I almost instantly faced an exception just after the startup of the test server:

[4/18/16 15:07:06:039 CEST] 00000216 BusinessObjec W com.ibm.commerce.foundation.server.command.bod.BusinessObjectDocumentProcessor static com.ibm.db2.jcc.am.SqlDataException
                                 java.lang.ClassNotFoundException: com.ibm.db2.jcc.am.SqlDataException
	at java.lang.Class.forNameImpl(Native Method)
	at java.lang.Class.forName(Class.java:256)
	at com.ibm.commerce.foundation.server.command.bod.BusinessObjectDocumentProcessor.<clinit>(BusinessObjectDocumentProcessor.java:141)
	at java.lang.J9VMInternals.initializeImpl(Native Method)
	at java.lang.J9VMInternals.initialize(J9VMInternals.java:235)
	at com.ibm.commerce.marketing.facade.server.MarketingFacadeImpl.processMarketingTrigger(MarketingFacadeImpl.java:107)
	at com.ibm.commerce.marketing.facade.server.EJSLocalStatelessMarketing_0e493592.processMarketingTrigger(EJSLocalStatelessMarketing_0e493592.java:233)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)
	at java.lang.reflect.Method.invoke(Method.java:620)
	at com.ibm.commerce.foundation.internal.client.services.invocation.impl.LocalEJBInvocationBindingImpl.invoke(LocalEJBInvocationBindingImpl.java:211)
	at com.ibm.commerce.foundation.internal.client.services.invocation.InvocationService.invoke(InvocationService.java:113)
	at com.ibm.commerce.foundation.client.facade.bod.AbstractBusinessObjectDocumentFacadeClient.internalSendBusinessObjectDocument(AbstractBusinessObjectDocumentFacadeClient.java:813)
	at com.ibm.commerce.foundation.client.facade.bod.AbstractBusinessObjectDocumentFacadeClient.sendBusinessObjectDocument(AbstractBusinessObjectDocumentFacadeClient.java:529)
	at com.ibm.commerce.marketing.facade.client.AbstractMarketingFacadeClient.processMarketingTrigger(AbstractMarketingFacadeClient.java:487)
	at com.ibm.commerce.marketing.facade.client.MarketingFacadeClient.processMarketingTrigger(MarketingFacadeClient.java:707)
	at com.ibm.commerce.marketing.facade.client.MarketingFacadeClient.processMarketingTrigger(MarketingFacadeClient.java:811)
	at com.ibm.commerce.marketing.internal.runtime.engine.SaveMarketingStatisticsCmdImpl.performExecute(SaveMarketingStatisticsCmdImpl.java:108)
	at com.ibm.commerce.command.ECCommandTarget.executeCommand(ECCommandTarget.java:157)
	at com.ibm.websphere.command.TargetableCommandImpl.execute(TargetableCommandImpl.java:139)
	at com.ibm.websphere.command.CacheableCommandImpl.execute(CacheableCommandImpl.java:139)
	at com.ibm.commerce.command.MeasuredCacheableCommandImpl.execute(MeasuredCacheableCommandImpl.java:68)
	at com.ibm.commerce.command.AbstractECTargetableCommand.execute(AbstractECTargetableCommand.java:199)
	at com.ibm.commerce.component.BaseComponentImpl.executeCommand(BaseComponentImpl.java:202)
	at com.ibm.commerce.component.WebAdapterComponentImpl.executeCommand(WebAdapterComponentImpl.java:46)
	at com.ibm.commerce.component.objimpl.WebAdapterServiceBeanBase.executeCommand(WebAdapterServiceBeanBase.java:58)
	at com.ibm.commerce.component.objects.EJSLocalStatelessWebAdapterService_ce749a4a.executeCommand(EJSLocalStatelessWebAdapterService_ce749a4a.java:31)
	at com.ibm.commerce.component.objects.WebAdapterServiceAccessBean.executeCommand(WebAdapterServiceAccessBean.java:160)
	at com.ibm.commerce.scheduler.SchedulerJob.process(SchedulerJob.java:562)
	at com.ibm.commerce.scheduler.SchedulerSecurityPriviledgedAction.run(SchedulerSecurityPriviledgedAction.java:59)
	at com.ibm.commerce.scheduler.SchedulerJob.run(SchedulerJob.java:1115)
	at com.ibm.commerce.threadmanagement.internal.BaseWork.run(BaseWork.java:139)
	at com.ibm.ws.asynchbeans.J2EEContext.run(J2EEContext.java:1178)
	at com.ibm.ws.asynchbeans.WorkWithExecutionContextImpl.go(WorkWithExecutionContextImpl.java:199)
	at com.ibm.ws.asynchbeans.CJWorkItemImpl.run(CJWorkItemImpl.java:236)
	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1881)

 Investigating a bit I found a possible solution.

 Working with the Aurora starter store- provided with the FEP7- could bring some misconfiguration, in particular on the Developer version, lead to "break" the front-end, like in this case:

The above screenshot reports just the top part of the front page were is visible an issue rendering the menu. Looking at the log, an exception gets a glimpse on the possible reason:

 
[5/7/14 16:47:12:451 CEST] 00000148 LoggingHelper E /GenericJSPPageError.jsp - java.io.FileNotFoundException: http://myserverhostname:80/search/resources/store/11451/categoryview/@top?catalogId=10401&depthAndLimit=11%2C11&responseFormat=json&responseFormat=json&langId=-1
                                 java.lang.RuntimeException: java.io.FileNotFoundException: http://myserverhostname:80/search/resources/store/11451/categoryview/@top?catalogId=10401&depthAndLimit=11%2C11&responseFormat=json&responseFormat=json&langId=-1
	at com.ibm.commerce.foundation.internal.client.util.RESTHandler.execute(RESTHandler.java:122)
	...
	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1656)
Caused by: java.io.FileNotFoundException: http://myserverhostname:80/search/resources/store/11451/categoryview/@top?catalogId=10401&depthAndLimit=11%2C11&responseFormat=json&responseFormat=json&langId=-1
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	...com.ibm.commerce.foundation.internal.client.util.RESTUtil.getWithMultiValuedParams(RESTUtil.java:172)
	at com.ibm.commerce.foundation.internal.client.util.RESTHandler.execute(RESTHandler.java:116)
	... 103 more
Caused by: java.io.FileNotFoundException: http://myserverhostname:80/search/resources/store/11451/categoryview/@top?catalogId=10401&depthAndLimit=11%2C11&responseFormat=json&responseFormat=json&langId=-1
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1457)
	at com.ibm.commerce.foundation.internal.client.util.RESTUtil.getWithMultiValuedParams(RESTUtil.java:136)
	... 104 more