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From "Robert Scholte" <>
Subject Re: [SUREFIRE] Issues with classpath and module path
Date Tue, 22 Nov 2016 20:54:49 GMT
On Tue, 22 Nov 2016 20:51:44 +0100, Benedikt Ritter <>  

> Hello again,
> Benedikt Ritter <> schrieb am Fr., 18. Nov. 2016 um
> 08:40 Uhr:
>> Hi,
>> I had the pleasure to meet Robert Scholte and Herve Boutemy here at
>> ApacheCon in Seville. We talked al little bit about the progress of the
>> JUnit 5 integration. This let us to create two sample projects which may
>> indicate problems both within surefire and within JUnit. We're still
>> investigating whether this are really issues. I'm in contact with the  
>> JUnit
>> team to find out what they might need to fix and I'm reaching out to the
>> Maven community to find out what we need to fix.
>> The first sample project is
>> It uses the configuration described at
>> to
>> configure the JUnit Jupiter test engine to run some tests. What we want  
>> to
>> find out is, whether the test class can see the classes of the test  
>> engine
>> (which they should not) and whether the production classes can see the  
>> test
>> classes or the test engine classes (which they should not). This is what
>> Robert called the "classpath problem", because everything in mangled
>> together in one classpath. This probably needs to be fixed inside JUnit.
>> Unfortunately currently the configuration described in the JUnit docs  
>> does
>> not work. So instead of configuring the jupiter engine, it just reports
>> that it can not find any engines.
> I've fixed the problem. The build now works an it fails for the right
> reason :-)
> I tried to explain this problem to Marc Philipp from JUnit but I failed  
> to
> understand why this is an issue at all. I mean, okay it may be cleaner if
> we had separate classloaders, but what would be a really error scenario a
> user might encounter when the same Classloader loads production and test
> classes?
>> The second example is and it is
>> about JUnit and Java 9 modules. Robert was sure that there is a problem
>> with modules and that it needs to be fixed in surefire. However we did  
>> not
>> get that example working at all, so Robert decided to investigate this  
>> some
>> more when he is back home.
>> Here is what we expect to fail: Suppose we have a package com.example  
>> with
>> some classes. Then we add some tests in src/test/java in the same  
>> package.
>> When we compile this and execute the tests, Java 9 should report that  
>> there
>> are several jars providing classes for the com.example package.
> I've also applied the fix from above to the java9 example.
> Marc Philipp and I agreed upon tackling the Java 9 issue from both (maven
> and junit) sites. He will talk to Sam Brannen from the Spring project and
> ask them how they do reflection in Java 9. Furthermore he things about
> writing to the OpenJDK Mailing list.
> On the Maven site, Robert wanted to take a look into this. @Robert: Did  
> you
> have some time to investigate this some more?

No, not yet. But I've found the description: , read Patching module content


> Regards,
> Benedikt
>> Hope I was able to give you a heads up on what we were talking about :-)
>> Regards,
>> Benedikt

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