Spring Boot: Unable to look up data source - spring-boot

Question

I'm running an application framework (jbpm) on Spring Boot which requires looking up a Datasource.
I'm facing the following error:
java.lang.RuntimeException: Unable to look up data source: java:jboss/datasources/ExampleDS - Need to specify class name in environment or system property, or in an application resource file: java.naming.factory.initial
at org.jbpm.process.workitem.executesql.ExecuteSqlWorkItemHandler.<init>(ExecuteSqlWorkItemHandler.java:83) ~[execute-sql-workitem-7.52.0.Final.jar:7.52.0.Final]
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
I have got the following properties in application.properties:
spring.datasource.username=sa
spring.datasource.password=sa
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driver-class-name=org.h2.Driver
#hibernate configuration
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.H2Dialect
I have also added in my configuration class the following:
#Bean
public DataSource jndiDataSource() throws IllegalArgumentException, NamingException {
JndiObjectFactoryBean bean = new JndiObjectFactoryBean();
bean.setJndiName("java:jboss/datasources/ExampleDS");
bean.setProxyInterface(DataSource.class);
bean.setLookupOnStartup(false);
bean.afterPropertiesSet();
return (DataSource) bean.getObject();
}
I have checked the code of the jbpm handler:
https://github.com/kiegroup/jbpm-work-items/blob/main/execute-sql-workitem/src/main/java/org/jbpm/process/workitem/executesql/ExecuteSqlWorkItemHandler.java#L79
I see this is the code which does the lookup:
this.ds = InitialContext.doLookup(dataSourceName);
What am I missing in my code/configuration?
Thanks
Edit: here's the core section of pom.xml:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.10.RELEASE</version>
</parent>
<properties>
<version.org.kie>7.52.0.Final</version.org.kie>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<narayana.version>5.9.0.Final</narayana.version>
<fabric8.version>3.5.40</fabric8.version>
</properties>
<dependencies>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-server-spring-boot-starter</artifactId>
<version>${version.org.kie}</version>
</dependency>
<dependency>
<groupId>org.jbpm.contrib</groupId>
<artifactId>execute-sql-workitem</artifactId>
<version>${version.org.kie}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>