Created attachment 152352 [details]
Maven projects demoing failure of including parameter names

There seems to be an issue regarding the use of javac's -parameters in Maven projects. When configuring the compiler plugin like so:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <target>1.8</target>
        <source>1.8</source>
        <compilerArgs>
            <arg>-parameters</arg>
        </compilerArgs>	
    </configuration>
</plugin>	  

i expect that the parameter names are retained, for concrete classes as well as abstract classes, interfaces and constructors according to the new Java 8 features regarding parameter names (http://docs.oracle.com/javase/tutorial/reflect/member/methodparameterreflection.html).


The concrete example for me using this is Spring Data JPA, where you can declare interfaces and abstract methods that are translated into JPA queries or mapped to existing named queries with named parameters. You can either choose to add an annotion to the interface methods (like i did before) or optain the mapping from parameter names.

Attached is a project that demonstrate the problem. There's a JPA entity with two named queries and a Spring Data JPA Repository that make use of those queries.
The queries contains named parameters. First repo method is annotated with the parameter name, the second not. Spring Data JPA generates implementation on the fly (don’t ask me how). Before Java 8 omitting the @Param wasn’t possible even with debug enabled because there’s no implementation of that method.

Running this in NetBeans 8.0.2
Product Version: NetBeans IDE 8.0.2 (Build 201411181905)
Java: 1.8.0_31; Java HotSpot(TM) 64-Bit Server VM 25.31-b07
Runtime: Java(TM) SE Runtime Environment 1.8.0_31-b13
System: Mac OS X version 10.10.2 running on x86_64; UTF-8; de_DE (nb)
User directory: /Users/msimons/Library/Application Support/NetBeans/8.0.1
Cache directory: /Users/msimons/Library/Caches/NetBeans/8.0.1

Basically the generated parameters seem to stay intact when i hit clean & build, then run or debug.
The moment i change the customer repository (just adding an empty line is enough), then debug, the call to findOneByUpperCaseNameWithoutAnnotation fails because Spring Data doesn’t fill the parameter name.

There's an additional readme inside the attached archive.