我几天前开始学习Ofbiz但是我没有遵循Ofbiz教程第3部分CRUD（https://cwiki.apache.org/confluence/display/OFBIZ/OFBiz+Tutorial+-+A+Beginners+Development+Guide）。当我开始运行createPracticePerson服务时，我得到了
JavaEventHandler |E| Problems Processing Event
java.lang.NullPointerException
at org.ofbiz.service.engine.GenericEngineFactory.getGenericEngine (GenericEngineFactory.java:53) ~[bin/:?]
at org.ofbiz.service.ServiceDispatcher.getGenericEngine(ServiceDispatcher.java:799) ~[bin/:?] ...
我已尝试使用其他教程作为参考（http://ofbiz.us/developing-enterprise-application-with-apache-ofbiz-platform），但仍然会收到相同的错误消息。我已经包含了一些xml文件以供参考。感谢
的ofbiz-component.xml文件
<ofbiz-component name="practice"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/ofbiz-component.xsd">
<resource-loader name="main" type="component"/>
<classpath type="dir" location="config"/>
<classpath type="jar" location="build/lib/*"/>
<service-resource type="model" loader="main" location="servicedef/services.xml"/>
<webapp name="practice"
title="Practice"
server="default-server"
base-permission="OFBTOOLS"
location="webapp/practice"
mount-point="/practice"
app-bar-display="true"/>
</ofbiz-component>
service.xml中
<services xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/services.xsd">
<description>Practice Services</description>
<vendor>OFBiz</vendor>
<version>1.0</version>
<service name="createPracticePerson" default-entity-name="Person" engine="engine-auto"
invoke="create" auth="true">
<description>Create a Person</description>
<auto-attributes include="pk" mode="OUT" optional="false"/>
<auto-attributes include="nonpk" mode="IN" optional="true"/>
<override name="comments" optional="true"/>
</service>
</services>
controller.xml
<?xml version="1.0" encoding="UTF-8"?>
<site-conf xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/site-conf.xsd">
<include location="component://common/webcommon/WEB-INF/common-controller.xml"/>
<include location="component://commonext/webapp/WEB-INF/controller.xml"/>
<description>Practice Component Site Configuration File</description>
<owner>Copyright 2001-2009 The Apache Software Foundation</owner>
<handler name="screenxml" type="view" class="org.ofbiz.widget.screen.ScreenXmlViewHandler"/>
<handler name="service" type="request" class="org.ofbiz.webapp.event.ServiceEventHandler"/>
<handler name="service-multi" type="request" class="org.ofbiz.webapp.event.ServiceMultiEventHandler"/>
<!-- Request Mappings -->
<request-map uri="main">
<security https="true" auth="true"/>
<response name="success" type="view" value="main"/>
<response name="error" type="view" value="main"/>
</request-map>
<request-map uri="personForm">
<security https="true" auth="true"/>
<response name="success" type="view" value="personForm"/>
<response name="error" type="view" value="personForm"/>
</request-map>
<request-map uri="createPracticePerson">
<security https="true" auth="true"/>
<event type="service" invoke="createPracticePerson"/>
<response name="success" type="view" value="personForm"/>
<response name="error" type="view" value="personForm"/>
</request-map>
<!-- end of request mappings -->
<!-- View Mappings -->
<view-map name="main" type="screen" page="component://practice/widget/PracticeScreens.xml#main"/>
<view-map name="personForm" type="screen" page="component://practice/widget/PracticeScreens.xml#personForm"/>
<!-- end of view mappings -->
</site-conf>
PracticeForm.xml
<?xml version="1.0" encoding="UTF-8"?>
<forms xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/widget-form.xsd">
<form name="ListPersons" type="list" list-name="persons" list-entry-name="person" target="updatePracticePerson" paginate-target="personForm">
<auto-fields-service service-name="updatePracticePerson" default-field-type="edit" map-name="person"/>
<field name="partyId"><hidden/></field>
<field name="submitButton" title="Update" widget-style="smallSubmit"><submit button-type="button"/></field>
<field name="deletePracticePerson" title="Delete Person" widget-style="buttontext">
<hyperlink target="deletePracticePerson?partyId=${person.partyId}" description="Delete"/>
</field>
</form>
<form name="CreatePerson" type="single" target="createPracticePerson">
<auto-fields-service service-name="createPracticePerson"/>
<field name="submitButton" title="${uiLabelMap.CommonAdd}" widget-style="smallSubmit"><submit button-type="button"/></field>
</form>
</forms>
PracticeScreens.xml
<?xml version="1.0" encoding="UTF-8"?>
<screens xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/widget-screen.xsd">
<screen name="main">
<section>
<actions>
<property-map resource="CommonUiLabels" map-name="uiLabelMap" global="true"/>
<property-map resource="PracticeUiLabels" map-name="uiLabelMap" global="true"/>
<set field="headerItem" value="main"/>
<set field="titleProperty" value="main page"/>
</actions>
<widgets>
<decorator-screen name="main-decorator" location="${parameters.commonDecoratorLocation}">
<decorator-section name="body">
<label text="${uiLabelMap.PracticeApplication}"/>
</decorator-section>
</decorator-screen>
<!-- <label>This is first practice</label> -->
</widgets>
</section>
</screen>
<screen name="personForm">
<section>
<actions>
<set field="headerItem" value="personForm"/>
<set field="titleProperty" value="PageTitlePracticePersonForm"/>
<entity-condition entity-name="Person" list="persons"/>
</actions>
<widgets>
<decorator-screen name="main-decorator" location="${parameters.commonDecoratorLocation}">
<decorator-section name="body">
<label text="Person List" style="h2"/>
<include-form name="ListPersons" location="component://practice/widget/PracticeForms.xml"></include-form>
<include-form name="CreatePerson" location="component://practice/widget/PracticeForms.xml"></include-form>
</decorator-section>
</decorator-screen>
</widgets>
</section>
</screen>
</screens>
答案 0 :(得分：0)
您是否实现了createPracticePerson服务，该服务实际创建了practicePerson？本教程中有一个minilang实现。