Cannot set conditional debug breakpoint or evaluate expressions in external maven sources (like Spring)

[phillipuniverse]

Final output:

Conditional Breakpoint has Compilation error(s).

Reason:
Unable to compile conditional breakpoint - missing Java project context.

Reproduction steps:

1. Download the latest STS from https://spring.io/tools (I got 4-4.0.1.RELEASE-e4.9.0-macosx.cocoa.x86_64.dmg)
2. I added the Lombok jar and -javaagent to the .app folder in order to use Lombok annotations
3. Went to File -> New Project -> Spring Starter Project and hit next until the project was created (just accepted all the defaults)
4. In the generated pom.xml, I changed it around to add spring-boot-starter-web and JUnit Jupiter
5. Changed the DemoApplicationTests to look like this:

   @ExtendWith(SpringExtension.class)
   @SpringBootTest
   public class DemoApplicationTests {
   
       @Configuration
       static class Config {
   	
       }
   
       @Component
       static class BeanFromTest {
   
       }
   
       @Autowired
       ApplicationContext ctx;
   
       @Test
       public void containsBean() {
           assertNotNull(ctx.getBean(BeanFromTest.class));
       }
   
    }

6. CMD + Shift + T to open DefaultListableBeanFactory, set a breakpoint in registerBeanDefinition() to hit when the BeanFromTest is registered
7. Hit 'Debug as Junit Test' to debug the test

The breakpoint hits on every single invocation because of the "Unable to compile conditional breakpoint - Missing Java Project Context". Also if you look in the screenshot, you'll see that 2 instances of DefaultListableBeanFactory are opened: 1 that has the little Java bytecode argument (which is where I originally set the breakpoint) and one that just has a J, which was opened when the breakpoint hit. The J icon usually means that the project is not a Java project.

Also might be interesting is that before running the JUnit test at all, I had previously downloaded the sources for spring-context so that was already in my ~/.m2/repository. It did not need to download it on-demand.

I also cannot do things I normally can in Java debugging, like right-click and "Inspect" with 'Unable to evaluate the selected expression' (even though hovering works):

[phillipuniverse]

Exact project ready to import: failing-conditional-breakpoint.zip

[phillipuniverse]

Bummer, this also happens in core Eclipse. Opened issue at https://bugs.eclipse.org/bugs/show_bug.cgi?id=542089, I'll close this one.

[martinlippert]

Thanks for double checking with a vanilla Eclipse and reporting over there. Much appreciated.