java - Spring: @Resource injection stopped working under JDK9

Question

In my @Configuration class I have dependendies like the following:

@Configuration
public class MyConfig {
    @Resource(name = "firstDataSource")
    private DataSource firstDataSource;

    // more code
}

The dependency injection worked in Oracle JDK 8: firstDataSource field was successfully injected with a non-null value.

Now I tried to run the application (with no modifications) in JDK 9. The result is that @Resource does not trigger dependency injection anymore: everything annotated with this annotation remains null.

What could be the reason for @Resource to stop working?

Spring 4.0.9 is used in the project.

Here is a test project demonstrating the problem: https://github.com/rpuch/test-spring-injection-jdk9

It contains a single test: MainTest which I run from my IDE. When I use JDK 8, it outputs

сен 29, 2017 10:45:13 PM org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@5f8ed237: startup date [Fri Sep 29 22:45:13 SAMT 2017]; root of context hierarchy
OK

But under JDK 9, it throws an exception during startup which is caused by the following:

Caused by: java.lang.IllegalStateException: bean1 is not injected
    at Bean2.<init>(Bean2.java:7)
    at Config2.bean2(Config2.java:16)

which happens when the dependency is not injected.

Answer 1

The java.xml.ws.annotation being deprecated in jdk9 is possibly the cause of what you're facing. Since the annotation @Resource is from the package javax.annotation exported by the same module.

You might want to provide javatm-common-annotations as an upgradeable module for java.xml.ws.annotation which exports the javax.annotation.

This standalone release of Java(TM) Common Annotations uses a Java Platform Module System "automatic" module name of java.annotation, to match the module name used in JDK 9.

The search on central suggests, you can use:-

<dependency>
    <groupId>javax.annotation</groupId>
    <artifactId>javax.annotation-api</artifactId>
    <version>1.3.1</version>
</dependency>

This runs fine on my machine with your shared code.

---

Also, a note about the code that you've shared. Since you're migrating to using JDK9, you should migrate to using latest springframework dependencies released as on 28-9-2017:-

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.0.0.RELEASE</version>
</dependency>

Edit : Do take a look at Roman's answer for an alternate to make use of --add-modules in case you are not planning to migrate to the javaee explosed module yet.