Reviewer and committer request for 7198496 (original) (raw)

David Holmes david.holmes at oracle.com
Wed Oct 3 13:17:40 UTC 2012

Paul,

On 3/10/2012 10:50 PM, Paul Sandoz wrote:

For the benefit of others; for some context see this recent thread:

http://markmail.org/search/?q=openjdk#query:openjdk%20list%3Anet.java.openjdk.core-libs-dev%20order%3Adate-backward+page:2+mid:inod424lqbey5fms+state:results Basically ServiceLoader is treating a null CL parameter as the system CL for loading the META-INF/services resources file and as the bootstrap CL for loading the classes of class names declared in those resource files. Which also means that calls to: ServiceLoader.load(serviceInterface) ServiceLoader.load(serviceInterface, Thread.currentThread().getContextClassLoader()); Will behave oddly if the TCCL is null, from the JavaDoc of Thread.getContextClassLoader(): http://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html#getContextClassLoader() Returns: the context ClassLoader for this Thread, or null indicating the system class loader (or, failing that, the bootstrap class loader)

The @return doc for getContextClassLoader is wrong, or at best mis-leading. A null return does NOT indicate the system class loader (which is never null) - it simply means there is no CCL for that thread. If anything null would represent the bootstrap loader.

David

Paul.

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