In JDK 9 build 148 javac throws NPE if a module that is compiled requires any other module outside of java.se and java.corba is specified as a root module

Example:
===============================
$ find src/
src/
src/m
src/m/module-info.java
src/m2
src/m2/module-info.java
$ cat src/m/module-info.java
module m {
  requires m2;
}
$ cat src/m2/module-info.java
module m2 {}
$ /set/java/re/jdk/9/promoted/ea/148/binaries/solaris-sparcv9/bin/javac --module-source-path src/ -d out src/m/module-info.java --add-modules java.corba
An exception has occurred in the compiler (9-ea). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
        at jdk.compiler/com.sun.tools.javac.code.Symtab.lookupPackage(Symtab.java:647)
        at jdk.compiler/com.sun.tools.javac.code.Symtab.enterClass(Symtab.java:710)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.enterClass(ClassReader.java:2533)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.classSigToType(ClassReader.java:788)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.sigToType(ClassReader.java:718)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.sigToType(ClassReader.java:668)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader$ProxyType.resolve(ClassReader.java:2998)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader$AnnotationDeproxy.resolvePossibleProxyType(ClassReader.java:2181)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader$AnnotationDeproxy.deproxyCompound(ClassReader.java:2031)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader$AnnotationDeproxy.deproxyCompoundList(ClassReader.java:2025)
        at jdk.compiler/com.sun.tools.javac.jvm.ClassReader$AnnotationCompleter.run(ClassReader.java:2245)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.flush(Annotate.java:177)
        at jdk.compiler/com.sun.tools.javac.comp.Annotate.unblockAnnotations(Annotate.java:134)
        at jdk.compiler/com.sun.tools.javac.comp.Enter.complete(Enter.java:591)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.readSourceFile(JavaCompiler.java:846)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.readSourceFile(JavaCompiler.java:821)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.readSourceFile(JavaCompiler.java:790)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.access$100(JavaCompiler.java:101)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler$1.complete(JavaCompiler.java:343)
        at jdk.compiler/com.sun.tools.javac.code.ClassFinder.fillIn(ClassFinder.java:357)
        at jdk.compiler/com.sun.tools.javac.code.ModuleFinder$1.complete(ModuleFinder.java:342)
        at jdk.compiler/com.sun.tools.javac.code.Symbol.complete(Symbol.java:633)
        at jdk.compiler/com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1273)
        at jdk.compiler/com.sun.tools.javac.comp.Modules$2.complete(Modules.java:516)
        at jdk.compiler/com.sun.tools.javac.code.Symtab.lambda$enterModule$10(Symtab.java:773)
        at jdk.compiler/com.sun.tools.javac.code.Symbol.complete(Symbol.java:633)
        at jdk.compiler/com.sun.tools.javac.comp.Modules.checkCyclicDependencies(Modules.java:1503)
        at jdk.compiler/com.sun.tools.javac.comp.Modules.access$400(Modules.java:127)
        at jdk.compiler/com.sun.tools.javac.comp.Modules$3.complete(Modules.java:602)
        at jdk.compiler/com.sun.tools.javac.code.Symbol.complete(Symbol.java:633)
        at jdk.compiler/com.sun.tools.javac.comp.Modules.computeTransitiveClosure(Modules.java:1159)
        at jdk.compiler/com.sun.tools.javac.comp.Modules.setupAllModules(Modules.java:1131)
        at jdk.compiler/com.sun.tools.javac.comp.Modules.lambda$initModules$0(Modules.java:233)
        at jdk.compiler/com.sun.tools.javac.comp.Modules.enter(Modules.java:265)
        at jdk.compiler/com.sun.tools.javac.comp.Modules.initModules(Modules.java:229)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.initModules(JavaCompiler.java:1048)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:942)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:307)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:160)
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:55)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:41)
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In the example above if m requires java.logging or if --add-modules doesn't specify java.corba nor java.se.ee, then compilation succeeds.