org.hibernate.MappingException: Unknown entity when implementing finder

[Nha Trinh, modificado 7 Anos atrás.]

Hello Everyone,

I followed to this tutorial: https://dev.liferay.com/develop/tutorials/-/knowledge_base/7-0/dynamic-query
to create my custom finder by using dynamic query.

This is the finder method in my implementation finder: ProcessFinderImpl.java

	public List<process> findByDiseaseId(int diseaseId) {
		Session session = null;
		try {
			session = openSession();

			DynamicQuery diseaseProcessQuery = DynamicQueryFactoryUtil.forClass(DiseaseProcess.class);
			diseaseProcessQuery.add(RestrictionsFactoryUtil.eq("diseaseId", diseaseId))
					.setProjection(ProjectionFactoryUtil.property("processId"));

			DynamicQuery processQuery = DynamicQueryFactoryUtil.forClass(Process.class);
			processQuery.add(PropertyFactoryUtil.forName("processId").in(diseaseProcessQuery));

			List<process> processes = ProcessLocalServiceUtil.dynamicQuery(processQuery);

			return processes;
		} catch (Exception e) {
			try {
				throw new SystemException(e);
			} catch (SystemException se) {
				se.printStackTrace();
			}
		} finally {
			closeSession(session);
		}
		return null;
	}</process></process>

I want to use this finder through *LocalServiceUtil, so I created a method in *LocalServiceImpl.
This is the method in my local implementation service: ProcessLocalServiceImpl.java:

	public List<process> findByDiseaseId(int diseaseId) {
		ProcessFinder processFinder = getProcessFinder();
		return processFinder.findByDiseaseId(diseaseId);
	}</process>

Problem number 1 is Service Builder didn't generate the *FinderUtil (ProcessFinderUtil).
So in my local implementation service, instead of using ProcessFinderUtil.findByDiseaseId(diseaseId), I have to use getProcessFinder() from ProcessLocalServiceBaseImpl to get the finder and call findByDiseaseId(diseaseId).

Problem number 2 is this exception: org.hibernate.MappingException: Unknown entity

I am using Liferay 7.0 CE GA3.
Here is the module-hbm.xml:

<!--?xml version="1.0"?-->


<hibernate-mapping auto-import="false" default-lazy="false">
	<import class="vn.nice.model.Disease" />
	<import class="vn.nice.model.DiseaseProcess" />
	<import class="vn.nice.model.Process" />
	<class name="vn.nice.model.impl.DiseaseImpl" table="disease">
		<id column="disease_id" name="diseaseId" type="int">
			<generator class="increment" />
		</id>
		<property column="disease_code" name="diseaseCode" type="com.liferay.portal.dao.orm.hibernate.StringType" />
		<property column="disease_label" name="diseaseLabel" type="com.liferay.portal.dao.orm.hibernate.StringType" />
		<property column="disease_image" name="diseaseImage" type="com.liferay.portal.dao.orm.hibernate.StringType" />
	</class>
	<class name="vn.nice.model.impl.DiseaseProcessImpl" table="disease_process">
		<id column="disease_process_id" name="diseaseProcessId" type="int">
			<generator class="increment" />
		</id>
		<property column="disease_id" name="diseaseId" type="com.liferay.portal.dao.orm.hibernate.IntegerType" />
		<property column="disease_process_sort" name="diseaseProcessSort" type="com.liferay.portal.dao.orm.hibernate.IntegerType" />
		<property column="process_id" name="processId" type="com.liferay.portal.dao.orm.hibernate.IntegerType" />
	</class>
	<class name="vn.nice.model.impl.ProcessImpl" table="process">
		<id column="process_id" name="processId" type="int">
			<generator class="increment" />
		</id>
		<property column="process_code" name="processCode" type="com.liferay.portal.dao.orm.hibernate.StringType" />
		<property column="process_label" name="processLabel" type="com.liferay.portal.dao.orm.hibernate.StringType" />
	</class>
</hibernate-mapping>

Someone know what is my problem, please help.
Thanks in advance,

Nha.

[Victor Zorin, modificado 6 Anos atrás.]

Re: Problem number 2 is this exception: org.hibernate.MappingException: Unknown entity

There is an answer to the second problem. Try the following approach:

DynamicQueryFactoryUtil class has 2 methods forClass():
1. just taking the classname
2. taking the classname but you can also pass the ClassLoader

So, if you receive an "Unknown Entity" exception, put as a second argument your local class loader, e.g.

DynamicQuery diseaseProcessQuery = DynamicQueryFactoryUtil.forClass(DiseaseProcess.class, ProcessFinderImpl.class..getClassLoader() );

The 2nd argument will ensure that DynamicQueryFactoryUtil will use your package.
Worked for us.