From 9d5ed33ef9b503f20506dbe3e410960069a99d0a Mon Sep 17 00:00:00 2001 From: Jason Zaugg Date: Fri, 23 Aug 2013 09:29:56 +0200 Subject: SI-7775 Harden against the shifting sands of System.getProperties If another thread writes a new system property (which can happen in pretty innocuous code such as `new Date`!), the compiler startup could fail with a `ConcurrentModificationException` as it iterated all bindings in the properties map in search of a boot classpath property for esoteric JVMs. This commit uses `Properties#getStringProperties` to get a snapshot of the keys that isn't backed by the live map, and iterates these instead. That method will also limit us to bindings with String values, which is all that we expect. --- src/compiler/scala/tools/reflect/WrappedProperties.scala | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'src') diff --git a/src/compiler/scala/tools/reflect/WrappedProperties.scala b/src/compiler/scala/tools/reflect/WrappedProperties.scala index c34edb8ba0..7ce0171c0b 100644 --- a/src/compiler/scala/tools/reflect/WrappedProperties.scala +++ b/src/compiler/scala/tools/reflect/WrappedProperties.scala @@ -26,9 +26,13 @@ trait WrappedProperties extends PropertiesTrait { override def envOrElse(name: String, alt: String) = wrap(super.envOrElse(name, alt)) getOrElse alt override def envOrNone(name: String) = wrap(super.envOrNone(name)).flatten - def systemProperties: Iterator[(String, String)] = { + def systemProperties: List[(String, String)] = { import scala.collection.JavaConverters._ - wrap(System.getProperties.asScala.iterator) getOrElse Iterator.empty + wrap { + val props = System.getProperties + // SI-7269 Be careful to avoid `ConcurrentModificationException` if another thread modifies the properties map + props.stringPropertyNames().asScala.toList.map(k => (k, props.get(k).asInstanceOf[String])) + } getOrElse Nil } } -- cgit v1.2.3