What do I do if the "Unable to instantiate default tuplizer" error message is returned when I query data by using Hibernate to use the JDBC driver for Tablestore? - Tablestore

Problem description

When I query data by using Hibernate to use the Java Database Connectivity (JDBC) driver for Tablestore, the following error occurs:

Exception in thread "main" org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
  at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:108)
  at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:133)
  at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:80)
  at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:322)
  at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:485)
  at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:133)
  at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
  at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:286)

Cause

The javassist-x.x.x.jar package is missing.

Solution

Install the javassist-x.x.x.jar package by using one of the following methods:

Install the javassist installation package javassist-x.x.x.jar and import the package to the project. For more information about the download path, see javassist installation package. In javassist-x.x.x.jar, x.x.x indicates the version number of javassist. Download a javassist installation package based on your business requirements.
Add dependencies to a Maven project.
Add the corresponding dependencies to the pom.xml file in the Maven project. The following sample code shows how to add content to <dependencies>. In this example, the 3.15.0-GA version is used.
```

<dependency>
    <groupId>org.javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.15.0-GA</version>
</dependency>
```