Hibernate error "unable to locate persister"

java hibernate maven jpa

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When the entities are residing in a different jar, you have to include it in persistence.xml. <jar-file>entities-packaged.jar</jar-file>. Different options are explained here

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maxenglander

Mostly self-taught developer. Hooked on computing since my first exposure to Linux in high school. My first internships were developing medical devices for a research lab at Siemens. After entering the real world, I spent the first four years of my career working for ad- and marketing- tech companies. Now I'm developing mental wellness technology for a startup.

Updated on July 13, 2022

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maxenglander almost 2 years
I am trying to execute some Java with the Maven exec plugin, and am getting an error Caused by: org.hibernate.UnknownEntityTypeException: Unable to locate persister: my.biz.CoolEntity. I tried a number of failed solutions, before ultimately finding a hacky fix. Based on the hacky fix, I believe the issue to be a runtime classpath error.

I am looking for an answer that will tell me how to address the problem without resorting to copying the needed files into place, as I do in the hacky fix.

Background

I have a Maven project "Project A" which has dependencies upon Hibernate 5.0.1.Final as well as another project "Project B". Project B contains my JPA entity classes, including my.biz.CoolEntity.

Normally, I build everything into a shaded JAR and run/deploy that, without any issues.

Hibernate issue

Recently, I began using Maven's exec:java goal, but am running into what on the surface is a Hibernate issue. when I run mvn exec:java -DmainClass=my.biz.CoolEntity, I get this error:
```
Caused by: org.hibernate.UnknownEntityTypeException: Unable to locate persister: my.biz.CoolEntity
        at org.hibernate.internal.SessionFactoryImpl.locateEntityPersister(SessionFactoryImpl.java:792) ~[hibernate-core-5.0.1.Fi
nal.jar:5.0.1.Final]
        at org.hibernate.internal.SessionImpl.locateEntityPersister(SessionImpl.java:2641) ~[hibernate-core-5.0.1.Final.jar:5.0.1
.Final]
        at org.hibernate.internal.SessionImpl.access$2500(SessionImpl.java:164) ~[hibernate-core-5.0.1.Final.jar:5.0.1.Final]
        at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2579) ~[hibernate-core-5.0.1.Final
.jar:5.0.1.Final]
        at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2566) ~[hibernate-core-5.0.1.Final
.jar:5.0.1.Final]
        at org.hibernate.internal.SessionImpl.byId(SessionImpl.java:1044) ~[hibernate-core-5.0.1.Final.jar:5.0.1.Final]
        at org.hibernate.internal.SessionImpl.get(SessionImpl.java:955) ~[hibernate-core-5.0.1.Final.jar:5.0.1.Final]
        at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1075) ~[hibernate-entitymanager-5.
0.1.Final.jar:5.0.1.Final] 
```
Failed attempts

I tried making use of the exec plugin's <additionalClasspathElements> and <includePluginDependencies>. The first solution didn't result in any different, and the second resulted in a compile-time error.

Hacky fix

What ended up working for me was copying the compiled classes from Project B into Project A.