Proprietary parts in the Sun's open source java release
Just found (1) that even the open source Sun's java release may have the poprietary parts for that the Sun itself has no right to put them under open source. The open source community surely will not be happy. The cited paper talks about fonts, but I know there are also other parts like omg.org.* classes that are normally generated from the IDL files with the "no-modify" licence. These files belong the the Object Management Group. From the API documentation, many Sun's CORBA classes also look like generated.
This may be a serious reason to think that the license may also be a GPL compatible, as the existing GNU Classpath project has the largely working implementation, including the manually written and documented omg.org classes. In other words, why to include the proprietary parts that are even not owned by Sun, when it is possible to find a replacements in the world of the Free software? Surely, Apache Harmony would also fit, but they do not have the manually written omg.org so far.