Replacement for JDK8 APIs

[Jonathan Gibbons]

Stéphan,

You say you are using com.sun.tools.javac.api.JavacTrees. Although that 
class is not exported from jdk.compiler, it is an implementation of the 
interface com.sun.source.util.Trees, which is exported.  Is the 
interface sufficient to your needs? If not, what methods are you calling?

-- Jon


On 11/27/16 1:16 AM, Stéphane Nicoll wrote:
> Hey,
>
> Thanks for all the feedback so far. Any idea about the annotation processor
> question? Is there a dedicated dev list for it maybe?
>
> Thank you,
> S.
>
>
> On Thu, Nov 24, 2016 at 3:22 PM, Stéphane Nicoll <snicoll at pivotal.io> wrote:
>
>> Hi,
>>
>> I am working on the Spring Boot project[1] and I am trying to make sure
>> our codebase compiles with the current JDK9 build[2]. So far I've hit two
>> major issues:
>>
>> We use "sun.misc.VMSupport" to retrieve the port being used by the Java
>> remote debugging. You can find the actual code in RemoteDebugPortProvider[3]
>>
>> We have an annotation processor that inspects all classes annotated with
>> @ConfigurationProperties and generates some meta-data about them. One
>> important piece of this is to extract the default value assigned to fields.
>> Consider the following example
>>
>> @ConfigurationProperties
>> public class Foo {
>>
>>    private static final String DEFAULT_NAME = "name";
>>
>>    private String name = DEFAULT_NAME;
>>
>>    private Integer counter = 42;
>>
>>    private List<String> hosts = Collections.singletonList("localhost");
>>
>>
>> }
>>
>> What we've build is a visitor that navigates to those elements and
>> extracts the default values assigned to each field, including navigating to
>> parent element (the "name" constant there) or inferring value from method
>> parameters ("localhost"). The  current code relies on a feature of the JDK
>> that is no longer exported[4]:
>>
>>
>> java.lang.IllegalAccessException: class org.springframework.boot.
>> configurationprocessor.fieldvalues.javac.Trees cannot access class
>> com.sun.tools.javac.api.JavacTrees (in module jdk.compiler) because
>> module jdk.compiler does not export com.sun.tools.javac.api to unnamed
>> module @5a7fe64
>> <https://github.com/spring-projects/spring-boot/commit/5a7fe64f>
>>
>> Does anybody has some insight as how we could migrate those two use cases?
>> In particular, the second use case could be implemented with a contract of
>> javax.lang.model but we haven't found how to do it.
>>
>> Thank you,
>> S.
>>
>>
>>
>> [1] https://github.com/spring-projects/spring-boot
>> [2] https://github.com/spring-projects/spring-boot/issues/7226
>> [3] https://github.com/spring-projects/spring-boot/blob/
>> master/spring-boot-devtools/src/main/java/org/
>> springframework/boot/devtools/tunnel/server/RemoteDebugPortProvider.java
>> [4] https://github.com/spring-projects/spring-boot/blob/
>> master/spring-boot-tools/spring-boot-configuration-
>> processor/src/main/java/org/springframework/boot/configurationprocessor/
>> fieldvalues/javac/Trees.java
>>
>>
>>
>>
>>