James Gosling, the co-creator of the Java programming language, has resigned from Oracle, he announced in a blog entry.
Gosling resigned on 2 April and has not yet taken a job elsewhere, he reported.
"As to why I left, it's difficult to answer: just about anything I could say that would be accurate and honest would do more harm than good," he wrote.
Gosling was the chief technology officer for Oracle's client software group and, before that, the chief technology officer of Sun's developer products group.
In 1991, he led a small group of engineers in a project, then called Oak, to build an object-oriented programming language that would run on a virtual machine, which would allow programs to run on multiple platforms, such as television set-top boxes. This work evolved into Java, which took off in conjunction with the growing use of the Internet, thanks in part to its inclusion into the Netscape browser.
Gosling follows a number of other noted ex-Sun employees out the door since Oracle's purchase of the company was finalised in January, including CEO Jonathan Schwartz, and XML co-inventor Tim Bray.
Less than a month ago, Gosling had stressed the importance of Java to Oracle. "Oracle has certainly been incredibly committed to keeping Java and the whole ecosystem as strong and as healthy as can be," he said, during a talk at a Java symposium in Las Vegas.
But around the same time he also expressed dismay over the growing politicization of the Java Community Process.
Fellow ex-Sun alumni Bray tweeted that he was "astounded that Gosling held on so long."