Java 9, Hibernate and java.sql/javax.transaction

Question

I've tried to "upgrade" a project using Hibernate to Java 9, but I am having problems getting the module to function properly.

The relevant part of my module-info.java looks like this:

module test {

    ...

    requires java.base;
    requires hibernate.core;
    requires javax.transaction;
    requires java.sql;

}

and the relevant dependencies in my POM are

The problem is, if I run the program, I get a NoClassDefFoundError for javax.transaction.SystemException. I looked into this, and quite obviously, my module is missing a requires on javax.transaction.

So I add a module dependency on javax.transaction-api. I then go on and attempt to run the program again - now I'm missing java.sql.SQLException.

Here is what I am having a problem with: if I add a dependency on the module java.sql, which contains this class, I end up with a conflict:

module reads package javax.transaction.xa from both java.sql and javax.transaction.api

java.sql and javax.transaction.api contain different packages, and have one in common (javax.transaction.xa), but I require all of them.

How do I deal with this? Is there something simple I am missing?

Seems similar to a [linked comment](https://stackoverflow.com/questions/47852809/java-9-java-lang-classnotfoundexception-java-sql-sqlexception-in-spring-boot-a#comment82696084_47852809) and a relevant [reply from Alan](https://stackoverflow.com/questions/47852809/java-9-java-lang-classnotfoundexception-java-sql-sqlexception-in-spring-boot-a#comment82698260_47852809) — Naman, Jan 14 '18 at 02:11
There's a MR of JSR 907 in progress (https://www.jcp.org/en/jsr/detail?id=907) to fix this. Once that is fixed then I would expect a new version of the JTA API artifact to be published with the right module name and also exporting only javax.transaction. — Alan Bateman, Jan 14 '18 at 14:24

score 4 · Accepted Answer · answered Jun 06 '18 at 15:54

Use version 1.3 instead of 1.2 of javax.transaction-api, in this version javax.transaction.xa has been removed.

Maven dependency:

<dependency>
    <groupId>javax.transaction</groupId>
    <artifactId>javax.transaction-api</artifactId>
    <version>1.3</version>
</dependency>

1 Answers1