NullPointerException while implementing Hibernate custom Naming Strategies

Resolution

Disclaimer: Links contained herein to external website(s) are provided for convenience only. Red Hat has not reviewed the links and is not responsible for the content or its availability. The inclusion of any link to an external website does not imply endorsement by Red Hat of the website or their entities, products or services. You agree that Red Hat is not responsible or liable for any loss or expenses that may result due to your use of (or reliance on) the external site or content.

Replace the code of CustomNamingStratiges class which implements PhysicalNamingStrategy with the below code:

import org.hibernate.boot.model.naming.Identifier;
import org.hibernate.boot.model.naming.PhysicalNamingStrategy;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;

public class CustomPhysicalNamingStrategy implements PhysicalNamingStrategy {

    @Override
    public Identifier toPhysicalCatalogName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
        return formatIdentifier(identifier);
    }

    @Override
    public Identifier toPhysicalColumnName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
        return formatIdentifier(identifier);
    }

    @Override
    public Identifier toPhysicalSchemaName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
        return formatIdentifier(identifier);
    }

    @Override
    public Identifier toPhysicalSequenceName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
        return formatIdentifier(identifier);
    }

    @Override
    public Identifier toPhysicalTableName(final Identifier identifier, final JdbcEnvironment jdbcEnv) {
        return formatIdentifier(identifier);
    }

// use your specific formatter or converter method for your use-case
    private Identifier formatIdentifier(final Identifier identifier) {
        if (identifier == null) {
            return identifier;
        }


        String name = identifier.getText(); 
        String newName = name.substring(0, 1).toUpperCase() + name.substring(1);
        return Identifier.toIdentifier(newName, identifier.isQuoted());
    }

}

Also add this CustomNamingStratiges class in application.properties file like below:

quarkus.hibernate-orm.physical-naming-strategy = xxxx.xxxxx.xxxxxx.CustomPhysicalNamingStrategy

Please note that the above code is just an example and the method formatIdentifier() will format the column name like below:

username --> Username

You need to use your own specific converter method for your use case.

For more information please check this link: Hibernate 5 Naming Strategy Configuration