Liferays Service Builder - 多对多关系

Question

我正在尝试many-to-many在我自己的实体和liferay Group实体之间创建.我的service.xml看起来像这样

<entity name="EntityA" local-service="true" remote-service="false">

    <column name="entityAId" type="long" primary="true" />

    <column name="title" type="String" />
    <column name="summary" type="String" />
    <column name="authorId" type="long" />

    <column name="attachments" type="Collection" entity="EntityAAttachment" mapping-key="entityAId" />
    <column name="groups" type="Collection" entity="com.liferay.portal.Group" mapping-table="EntityAs_Groups" />

</entity>

根据service.xml的DTD,这应该生成多对多关系但我只能得到它

Method public java.util.List com.liferay.portal.tools.servicebuilder.ServiceBuilder.getMappingEntities(java.lang.String) throws java.io.IOException threw an exception when invoked on com.liferay.portal.tools.servicebuilder.ServiceBuilder@21ff3fcf
The problematic instruction:
----------
==> list serviceBuilder.getMappingEntities(column.mappingTable) as mapColumn [on line 201, column 49 in com/liferay/portal/tools/servicebuilder/dependencies/model_impl.ftl]
----------
Java backtrace for programmers:
----------
freemarker.template.TemplateModelException: Method public java.util.List com.liferay.portal.tools.servicebuilder.ServiceBuilder.getMappingEntities(java.lang.String) throws java.io.IOException threw an exception when invoked on com.liferay.portal.tools.servicebuilder.ServiceBuilder@21ff3fcf
    at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
    at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:93)
    at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
    at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.Environment.visit(Environment.java:299)
    at freemarker.core.CompressedBlock.accept(CompressedBlock.java:73)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.IfBlock.accept(IfBlock.java:82)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179)
    at freemarker.core.Environment.visit(Environment.java:417)
    at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.Environment.process(Environment.java:190)
    at freemarker.template.Template.process(Template.java:237)
    at com.liferay.portal.freemarker.FreeMarkerUtil.process(FreeMarkerUtil.java:49)
    at com.liferay.portal.freemarker.FreeMarkerUtil.process(FreeMarkerUtil.java:39)
    at com.liferay.portal.tools.servicebuilder.ServiceBuilder._processTemplate(ServiceBuilder.java:4447)
    at com.liferay.portal.tools.servicebuilder.ServiceBuilder._createModelImpl(ServiceBuilder.java:2420)
    at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:1023)
    at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:404)
    at com.liferay.portal.tools.servicebuilder.ServiceBuilder.main(ServiceBuilder.java:176)
Caused by: java.lang.NullPointerException
    at com.liferay.portal.tools.servicebuilder.ServiceBuilder.getMappingEntities(ServiceBuilder.java:1366)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:840)
    at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
    ... 32 more

我在这里做错了什么？我正在使用最新的Liferay stable 6.0.5

Answer 1

有关 Liferay Servie 构建器的更多信息请查看这篇文章。

http://liferaydemystified.blogspot.com/2011/04/mvc-portlet-development-service-builder.html