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Hello evry body,

I am folowwing the Guestbook tutorial : https://help.liferay.com/hc/en-us/articles/360029316371-Developer-Tutorials

I am facing a NoClassDefFoundError issue : 
Caused by: com.liferay.portal.kernel.portlet.PortletContainerException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/liferay/docs/guestbook/model/GuestbookEntry
    at com.liferay.portlet.internal.PortletContainerImpl._preserveGroupIds(PortletContainerImpl.java:424) ~[portal-impl.jar:?]
    at com.liferay.portlet.internal.PortletContainerImpl.render(PortletContainerImpl.java:211) ~[portal-impl.jar:?]
    at com.liferay.portlet.SecurityPortletContainerWrapper.render(SecurityPortletContainerWrapper.java:134) ~[portal-impl.jar:?]
    at com.liferay.portlet.RestrictPortletContainerWrapper.lambda$render$0(RestrictPortletContainerWrapper.java:124) ~[portal-impl.jar:?]
    at com.liferay.portlet.RestrictPortletContainerWrapper._render(RestrictPortletContainerWrapper.java:185) ~[portal-impl.jar:?]
    at com.liferay.portlet.RestrictPortletContainerWrapper.render(RestrictPortletContainerWrapper.java:122) ~[portal-impl.jar:?]
    at com.liferay.portal.kernel.portlet.PortletContainerUtil.render(PortletContainerUtil.java:214) ~[portal-kernel.jar:?]
    at com.liferay.portal.layoutconfiguration.util.PortletRenderer._render(PortletRenderer.java:149) ~[portal-impl.jar:?]
    at com.liferay.portal.layoutconfiguration.util.PortletRenderer.render(PortletRenderer.java:65) ~[portal-impl.jar:?]
    at com.liferay.portal.layoutconfiguration.util.RuntimePageImpl.doProcessTemplate(RuntimePageImpl.java:482) ~[portal-impl.jar:?]
    at com.liferay.portal.layoutconfiguration.util.RuntimePageImpl.doDispatch(RuntimePageImpl.java:339) ~[portal-impl.jar:?]
    at com.liferay.portal.layoutconfiguration.util.RuntimePageImpl.processTemplate(RuntimePageImpl.java:142) ~[portal-impl.jar:?]
    at com.liferay.portal.layoutconfiguration.util.RuntimePageImpl.processTemplate(RuntimePageImpl.java:167) ~[portal-impl.jar:?]
    at com.liferay.portal.kernel.layoutconfiguration.util.RuntimePageUtil.processTemplate(RuntimePageUtil.java:89) ~[portal-kernel.jar:?]
    at com.liferay.layout.taglib.servlet.taglib.RenderLayoutStructureTag._renderDropZoneLayoutStructureItem(RenderLayoutStructureTag.java:848) ~[?:?]
    at com.liferay.layout.taglib.servlet.taglib.RenderLayoutStructureTag._renderLayoutStructure(RenderLayoutStructureTag.java:1065) ~[?:?]
    at com.liferay.layout.taglib.servlet.taglib.RenderLayoutStructureTag._renderLayoutStructure(RenderLayoutStructureTag.java:1138) ~[?:?]
    at com.liferay.layout.taglib.servlet.taglib.RenderLayoutStructureTag.processStartTag(RenderLayoutStructureTag.java:169) ~[?:?]
    at com.liferay.taglib.util.IncludeTag.doStartTag(IncludeTag.java:116) ~[util-taglib.jar:?]
    at org.apache.jsp.layout.view.portlet_jsp._jspService(portlet_jsp:214) ~[?:?]
    ... 165 more

Here is my environnement conficuration (I submitted my project on github : https://github.com/stmEvBy/guestbook-tuto.git):

- eclipse 2022-03
- liferay eclipse plugin : liferay-ide-updatesite-3.9.6-ga7-202203281408.zip

- eclipse.ini : 
    -vm
    C:/myfolder/Amazon Corretto/jdk11.0.14_10/bin
    
- gradle.properties:
    distributionBase=GRADLE_USER_HOME
    distributionPath=wrapper/dists
    distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-bin.zip
    zipStoreBase=GRADLE_USER_HOME
    zipStorePath=wrapper/dists
        
- liferay bundle server:
    liferay-ce-portal-7.4.3.30-ga30
    
- bnd.bnd guestbook-web
    Bundle-Name: guestbook-web
    Bundle-SymbolicName: com.liferay.docs.guestbook.portlet
    Bundle-Version: 1.0.0
    Export-Package: com.liferay.docs.guestbook.portlet.constants
    
- bnd.bnd guestbook-service
    Bundle-Name: guestbook-service
    Bundle-SymbolicName: com.liferay.docs.guestbook.service
    Bundle-Version: 1.0.0
    Liferay-Require-SchemaVersion: 1.0.0
    Liferay-Service: true
    -dsannotations-options: inherit
    
- bnd.bnd guestbook-api
    Bundle-Name: guestbook-api
    Bundle-SymbolicName: com.liferay.docs.guestbook.api
    Bundle-Version: 1.0.0
    Export-Package:\
        com.liferay.docs.guestbook.exception,\
        com.liferay.docs.guestbook.model,\
        com.liferay.docs.guestbook.service,\
        com.liferay.docs.guestbook.service.persistence
    -check: EXPORTS
    -includeresource: META-INF/service.xml=../guestbook-service/service.xml
    
- service.xml
    <?xml version="1.0"?>
    <!DOCTYPE service-builder PUBLIC "-//Liferay//DTD Service Builder 7.4.0//EN" "http://www.liferay.com/dtd/liferay-service-builder_7_4_0.dtd">
    <service-builder dependency-injector="ds"
        package-path="com.liferay.docs.guestbook" mvcc-enabled="true">
        <author>liferay</author>
        <namespace>GB</namespace>
        <entity name="Guestbook" local-service="true" uuid="true"
            remote-service="true">

            <!-- Guestbook fields -->

            <column name="guestbookId" primary="true" type="long" />
            <column name="name" type="String" />

            <!-- Group instance -->

            <column name="groupId" type="long" />
            <column name="companyId" type="long" />

            <!-- Audit fields -->

            <column name="userId" type="long" />
            <column name="userName" type="String" />
            <column name="createDate" type="Date" />
            <column name="modifiedDate" type="Date" />

            <!-- Status fields -->

            <column name="status" type="int" />
            <column name="statusByUserId" type="long" />
            <column name="statusByUserName" type="String" />
            <column name="statusDate" type="Date" />

            <finder name="GroupId" return-type="Collection">
                <finder-column name="groupId" />
            </finder>

        </entity>

        <entity name="GuestbookEntry" local-service="true"
            remote-service="true" uuid="true">

            <!-- Guestbook Entry fields -->
            <!-- [Implementing Service Methods] refresh service - refresh api - gradle refresh service - gradle refresh api -->
            <column name="entryId" primary="true" type="long" />
            <column name="name" type="String" />
            <column name="email" type="String" />
            <column name="message" type="String" />
            <column name="guestbookId" type="long" />

            <!-- Group instance -->

            <column name="groupId" type="long" />
            <column name="companyId" type="long" />

            <!-- Audit fields -->

            <column name="userId" type="long" />
            <column name="userName" type="String" />
            <column name="createDate" type="Date" />
            <column name="modifiedDate" type="Date" />

            <!-- Status fields -->

            <column name="status" type="int" />
            <column name="statusByUserId" type="long" />
            <column name="statusByUserName" type="String" />
            <column name="statusDate" type="Date" />

            <order>
                <order-column name="createDate" order-by="desc" />
            </order>

            <finder name="G_G" return-type="Collection">
                <finder-column name="groupId" />
                <finder-column name="guestbookId" />
            </finder>
        </entity>

        <exceptions>
            <exception>GuestbookEntryEmail</exception>
            <exception>GuestbookEntryMessage</exception>
            <exception>GuestbookEntryName</exception>
            <exception>GuestbookName</exception>
        </exceptions>

    </service-builder>

- edit_entry.jsp

    <%@ include file="../init.jsp" %>
    
    <% 

    long entryId = com.liferay.portal.kernel.util.ParamUtil.getLong(renderRequest, "entryId");

    com.liferay.docs.guestbook.model.GuestbookEntry entry = null;
    if (entryId > 0) {
      entry = com.liferay.docs.guestbook.service.GuestbookEntryLocalServiceUtil.getGuestbookEntry(entryId);
    }

    long guestbookId = com.liferay.portal.kernel.util.ParamUtil.getLong(renderRequest, "guestbookId");

    %>

    <portlet:renderURL var="viewURL">
        <portlet:param name="mvcPath" value="/guestbook/view.jsp"></portlet:param>
    </portlet:renderURL>

    <portlet:actionURL name="addEntry" var="addEntryURL" />

    <aui:form action="<%= addEntryURL %>" name="<portlet:namespace />fm">

    <aui:model-context bean="<%= entry %>" model="<%= com.liferay.docs.guestbook.model.GuestbookEntry.class %>" />

        <aui:fieldset>

            <aui:input name="name" />
            <aui:input name="email" />
            <aui:input name="message" />
            <aui:input name="entryId" type="hidden" />
            <aui:input name="guestbookId" type="hidden" value='<%= entry == null ? guestbookId : entry.getGuestbookId() %>'/>

        </aui:fieldset>

        <aui:button-row>

            <aui:button type="submit"></aui:button>
            <aui:button type="cancel" onClick="<%= viewURL.toString() %>"></aui:button>

        </aui:button-row>
    </aui:form>

Does the problem come form the service.xml or is it a configuration problem?