Java 9 (JDK-9) support for guice

I am evaluating my projects with a pre-release Java 9 SDK. It’s using recent guice that fails to inject the dependencies. Guice is trying to alter some classes in java.base module via setAccessible(...) Reflection call. Many other DI frameworks suffer from the same issue.

Are you currently working on Java 9 support for guice?

I used Java(TM) SE Runtime Environment (build 9-ea+159) and guice 1.4.1. Build target is Java 1.8.

Here is the stack trace that occured when DI-ing:

Exception in thread "Thread-0" java.lang.ExceptionInInitializerError
      at com.google.inject.internal.cglib.reflect.$FastClass$Generator.getProtectionDomain(FastClass.java:73)
      at com.google.inject.internal.cglib.core.$AbstractClassGenerator.create(AbstractClassGenerator.java:206)
      at com.google.inject.internal.cglib.reflect.$FastClass$Generator.create(FastClass.java:65)
      at com.google.inject.internal.BytecodeGen.newFastClassForMember(BytecodeGen.java:252)
      at com.google.inject.internal.BytecodeGen.newFastClassForMember(BytecodeGen.java:203)
      at com.google.inject.internal.ProviderMethod.create(ProviderMethod.java:69)
      at com.google.inject.internal.ProviderMethodsModule.createProviderMethod(ProviderMethodsModule.java:275)
      at com.google.inject.internal.ProviderMethodsModule.getProviderMethods(ProviderMethodsModule.java:144)
      at com.google.inject.internal.ProviderMethodsModule.configure(ProviderMethodsModule.java:123)
      at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340)
      at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:349)
      at com.google.inject.spi.Elements.getElements(Elements.java:110)
      at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:138)
      at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:104)
      at com.google.inject.Guice.createInjector(Guice.java:99)
      at de.client.main.Factory.createInjector(Factory.java:248)
      at de.client.main.Main$1$1.run(Main.java:76)
      at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @a42cff
      at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:335)
      at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:278)
      at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:196)
      at java.base/java.lang.reflect.Method.setAccessible(Method.java:190)
      at com.google.inject.internal.cglib.core.$ReflectUtils$1.run(ReflectUtils.java:52)
      at java.base/java.security.AccessController.doPrivileged(Native Method)
      at com.google.inject.internal.cglib.core.$ReflectUtils.<clinit>(ReflectUtils.java:42)
      ... 21 more

I can surpass that issue using the VM args --add-opens java.base/java.lang=ALL-UNNAMED

[bartlomiej-dawidow]

Java 9 was released a few weeks ago, it’s high time to update Guice.

[anthraxx]

What exactly is left? I stronly think its solid enough for a release, any minor additional java9 related changes can go into a fixup point relese. Guice with java9 is really unusable and its just getting worse and wore the more time passes. Whatever is left, it seems good enough to get a release now and a possible fixup later.