After going thru the steps 1-3 i.e. after the summary of the check out, I click to the button "next".
My local URL:
http://127.0.0.1:8080/magnoliaPublic/demo-project/shop/shoppingCart/checkoutForm/confirmation.html?mgnlFormToken=qJ5dckZfsWT0wURQgRTT2QyQEqrxq2f1

The following error occures:

HTTP Status 500 -
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception

java.lang.RuntimeException: java.lang.NoSuchMethodError: javax.jcr.Node.getIdentifier()Ljava/lang/String;
info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:159)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:75)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:64)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:88)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:82)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:86)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:120)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:105)
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:216)

root cause

java.lang.NoSuchMethodError: javax.jcr.Node.getIdentifier()Ljava/lang/String;
org.apache.jackrabbit.ocm.manager.objectconverter.impl.SimpleFieldsHelper.refreshUuidPath(SimpleFieldsHelper.java:151)
org.apache.jackrabbit.ocm.manager.objectconverter.impl.ObjectConverterImpl.insert(ObjectConverterImpl.java:228)
info.magnolia.module.ocm.ext.MgnlDefaultCollectionConverterImpl.insertManageableCollection(MgnlDefaultCollectionConverterImpl.java:147)
info.magnolia.module.ocm.ext.MgnlDefaultCollectionConverterImpl.doInsertCollection(MgnlDefaultCollectionConverterImpl.java:119)
org.apache.jackrabbit.ocm.manager.collectionconverter.impl.AbstractCollectionConverterImpl.insertCollection(AbstractCollectionConverterImpl.java:80)
org.apache.jackrabbit.ocm.manager.objectconverter.impl.ObjectConverterImpl.insertCollectionFields(ObjectConverterImpl.java:906)
org.apache.jackrabbit.ocm.manager.objectconverter.impl.ObjectConverterImpl.insert(ObjectConverterImpl.java:227)
info.magnolia.module.ocm.ext.MgnlObjectConverterImpl.insert(MgnlObjectConverterImpl.java:155)
org.apache.jackrabbit.ocm.manager.impl.ObjectContentManagerImpl.insert(ObjectContentManagerImpl.java:409)
info.magnolia.module.shop.processors.SaveAndConfirmFormProcessor.internalProcess(SaveAndConfirmFormProcessor.java:99)
info.magnolia.module.form.processors.AbstractFormProcessor.process(AbstractFormProcessor.java:67)
info.magnolia.module.form.paragraphs.models.AbstractFormEngine.executeProcessors(AbstractFormEngine.java:128)
info.magnolia.module.form.engine.FormEngine.processSubmission(FormEngine.java:163)
info.magnolia.module.form.engine.FormEngine.handleRequest(FormEngine.java:100)
info.magnolia.module.form.paragraphs.models.AbstractFormModel.execute(AbstractFormModel.java:77)
info.magnolia.module.templating.ModelExecutionFilter.doFilter(ModelExecutionFilter.java:126)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.InterceptFilter.doFilter(InterceptFilter.java:121)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.AggregatorFilter.doFilter(AggregatorFilter.java:104)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:64)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.RepositoryMappingFilter.doFilter(RepositoryMappingFilter.java:91)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:76)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:69)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:57)
info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:147)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:75)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:64)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:88)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:82)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:86)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:120)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:105)
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:216)