Question

我正在使用服务构建器在我的liferay 6.1钩子中创建新实体。我想在我的一个自定义实体和门户网站的用户实体之间创建多对多的关系。所以我做了以下事情：

<entity name="MyEntity" local-service="true" remote-service="true">
<column name="myEntityId" type="long" primary="true"></column>
<column name="users" type="Collection" entity="com.liferay.portal.User" mapping-table="Users_Garages"></column>
<reference entity="User" package-path="com.liferay.portal"></reference>
</entity>

但是，当我构建服务构建器时，我得到以下异常：

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@28a6a735
The problematic instruction:
----------
==> list serviceBuilder.getMappingEntities(column.mappingTable) as mapColumn [on line 260, column 41 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@28a6a735
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:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.visit(Environment.java:310)
at freemarker.core.CompressedBlock.accept(CompressedBlock.java:73)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179)
at freemarker.core.Environment.visit(Environment.java:428)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.process(Environment.java:199)
at freemarker.template.Template.process(Template.java:237)
at com.liferay.portal.freemarker.FreeMarkerUtil.process(FreeMarkerUtil.java:47)
at com.liferay.portal.freemarker.FreeMarkerUtil.process(FreeMarkerUtil.java:37)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder._processTemplate(ServiceBuilder.java:4983)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder._createModelImpl(ServiceBuilder.java:2293)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:671)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder.main(ServiceBuilder.java:151)
Caused by: java.lang.NullPointerException
at com.liferay.portal.tools.servicebuilder.ServiceBuilder.getMappingEntities(ServiceBuilder.java:1048)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:866)
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
... 27 more

对此有何帮助？

谢谢

Answer 1

再创建一个实体，它将存储两个表的主键。通过这个你可以映射多对多的关系表。

表格：用户 2.真实性 3.user_myentity

钩子中自定义实体和用户实体之间的多对多关系

1 个答案: