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https://issues.apache.org/jira/browse/NETBEANS-5127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17288619#comment-17288619
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Austin Stephens commented on NETBEANS-5127:
-------------------------------------------
This does not seem to require using a db class file, but I don't have a
reproducible test case yet.
> Null pointer exception using the "Entity Classes from Database" wizard
> ----------------------------------------------------------------------
>
> Key: NETBEANS-5127
> URL: https://issues.apache.org/jira/browse/NETBEANS-5127
> Project: NetBeans
> Issue Type: Bug
> Components: javaee - Persistence
> Affects Versions: 12.2
> Environment: Windows 10; Product Version: Apache NetBeans IDE 12.2
> Java: 15; OpenJDK 64-Bit Server VM 15+36-1562
> Derby DB v10.14.2.0
> Wildfly 21.0.1
> Reporter: Stephen Brooksbank
> Priority: Major
> Attachments: messages.log
>
>
> I'm getting a null pointer exception when trying to generate database entity
> classes using the wizard:
> {{java.lang.NullPointerException: Cannot invoke
> "com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors.iterator()"
> because "this.discoveredProcs" is null}}
> NOTE: This is a regression issue, as it works correctly using Netbeans 12.1.
> I'm using Apache Derby DB and Wildfly.There are two unmapped entities in the
> database (one-to-many relationship), and the persistence context is set up to
> use JTA.
> What gets generated is two "stub" java class files containing only the basic
> class definition without any content
> {{package com.brooksbank.weldexamples.db;}}
> {{/**}}
> * @author sjbro
> */
> {{public class Codetypes {}}
> {{}}}
> The persistance context is :
> {{<?xml version="1.0" encoding="UTF-8"?>}}
> <persistence
> version="2.2"
> xmlns="http://xmlns.jcp.org/xml/ns/persistence";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
> [http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd]";>
> <persistence-unit name="com.brooksbank_weldExamples_war_1.0PU"
> transaction-type="JTA">
> <provider>org.hibernate.ejb.HibernatePersistence</provider>
> <jta-data-source>java:/weldExamplesDS</jta-data-source>
> </persistence-unit>
> {{</persistence>}}
> The datasource is defined in wildfly as:
> {\{ <datasource jndi-name="java:/weldExamplesDS"
> pool-name="weldExamplesDSPool">}}
> \{{
> <connection-url>jdbc:derby://localhost:1527/WeldExamplesDB</connection-url>}}
> \{{ <driver-class>org.apache.derby.jdbc.ClientDriver</driver-class>}}
> \{{ <driver>derbyclient.jar</driver>}}
> \{{ <security>}}
> \{{ <user-name>******</user-name>}}
> \{{ <password>******</password>}}
> \{{ </security>}}
> \{{ </datasource>}}
> The connection to the database works for other database record types and the
> wizard pulls up the list of entities correctly to select from.
>
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