Java 9 Compatibility

[guw]

With Java 9 being GA we need to check whether the Apex Language Service supports running with a Java 9 Development Kit.

GPL Binaries (from Oracle) here:
http://jdk.java.net/9

Just Linux for now.

Oracle Java 9 Downloads:
http://www.oracle.com/technetwork/java/javase/downloads/index.html

[guw]

@vazexqi @kaplanjosh This is something we should probably have on the todo list.

[fcathala]

Note that Java 9 is not just Linux but all platforms. It looks to me like Oracle is pushing v9: http://www.oracle.com/technetwork/java/javase/downloads/jre9-downloads-3848532.html

[vazexqi]

Jan 18, 2018 5:47:49 PM com.google.common.util.concurrent.ServiceManager$ServiceListener failed
SEVERE: Service Apex Prelude Service [FAILED] has failed in the STARTING state.
java.lang.NoClassDefFoundError: javax/xml/ws/Holder
    at apex.jorje.semantic.ast.visitor.ValidationScope.push(ValidationScope.java:75)
    at apex.jorje.semantic.ast.statement.BlockStatement.validate(BlockStatement.java:151)
    at apex.jorje.semantic.ast.statement.MethodBlockStatement.validate(MethodBlockStatement.java:82)
    at apex.jorje.semantic.ast.member.Method.validate(Method.java:168)
    at apex.jorje.semantic.ast.compilation.UserClass.validate(UserClass.java:183)
    at apex.jorje.semantic.compiler.CodeUnit.validate(CodeUnit.java:233)
    at apex.jorje.semantic.compiler.CompilerOperations$ValidateOperation.invoke(CompilerOperations.java:107)
    at apex.jorje.semantic.compiler.CompilerStageProcessor.processFirstStage(CompilerStageProcessor.java:133)
    at apex.jorje.semantic.compiler.CompilerStageProcessor.processToStage(CompilerStageProcessor.java:103)
    at apex.jorje.semantic.compiler.ApexCompiler.compile(ApexCompiler.java:115)
    at apex.jorje.lsp.impl.services.StandardCompilerService.compile(StandardCompilerService.java:122)
    at apex.jorje.lsp.impl.services.ApexPreludeManagedService.scanApexStandardLibraryIfNecessary(ApexPreludeManagedService.java:168)
    at apex.jorje.lsp.impl.services.ApexPreludeManagedService.startUp(ApexPreludeManagedService.java:98)
    at com.google.common.util.concurrent.AbstractIdleService$DelegateService$1.run(AbstractIdleService.java:60)
    at com.google.common.util.concurrent.Callables$3.run(Callables.java:100)
    at java.base/java.lang.Thread.run(Thread.java:844)

This is because of https://stackoverflow.com/questions/43574426/how-to-resolve-java-lang-noclassdeffounderror-javax-xml-bind-jaxbexception-in-j

We would either change jorje to not use javax/xml/ws/Holder or we special case for Java 9.

However, because Java 9 doesn't seem to be a long-term release according to http://www.oracle.com/technetwork/java/eol-135779.html, I'm thinking of holding off until 18.9^ (LTS) comes out.

[vazexqi]

According to http://www.oracle.com/technetwork/java/eol-135779.html Java 9 SE is not a long-term release. The next long-term release is Java 11 (18.9-LTS) which will be out September 2018. We will support it then.

I'm closing this issue now.

[matteobosc]

Java 11 (18.9-LTS) is out since almost three months, still no support for this extension. Apex autocomplete and DB definition are key functionality for Salesforce developers. Do you have a milestone for the new stable Java support?