Concerns about Sun's position as a competitor to Oracle were raised by antitrust regulators, open source advocates, customers, and employees over the acquisition.

[3] The DG COMP of the European Commission finally approved the takeover, apparently pressured by the U.S. DOJ Antitrust Division to do so, according to a diplomatic cable leaked in September 2011.

[6] At about the same time, Sun also began discussions with another company, widely rumored but not confirmed to be Hewlett-Packard, about a potential acquisition.

[7] The terms of the agreement between Oracle and Sun included dependencies on the antitrust laws of "the United States and Canada, European Union, China, Israel, Switzerland, Russia, Australia, Turkey, Korea, Japan, Mexico and South Africa".

[9] On September 3, 2009, the European Commission announced that it would not immediately approve the deal, but would instead perform a second round of investigation, focusing on the implications of Oracle's control of MySQL (acquired by Sun in 2008).

[10] On October 20, 2009, Sun filed with the U.S. Securities and Exchange Commission (SEC) its intention to cut 3,000 jobs globally over next 12 months, citing losses caused by delays in the acquisition process.

[11] On November 6, in its 10-Q filing for the 1st quarter of the 2010 fiscal year, Sun announced a 25% total revenue decrease compared to the 1st quarter of the previous year, due to "economic downturn, the uncertainty associated with our proposed acquisition by Oracle, increased competition and delays in customer purchasing decisions".

While the deal was still pending regulatory approval, the JRuby team collectively resigned from Sun and moved to Engine Yard.

[15] Most of Sun's executive management team, including CEO Jonathan Schwartz, resigned immediately after the acquisition was complete.

[17] In early 2010, troubling signals began to emerge concerning the future of OpenSolaris, including its absence from Oracle product roadmaps.

Since Oracle was no longer supporting all the development of an open version of Solaris, the OpenSolaris Governing Board disbanded shortly after this was revealed, ending the project.

In response, several forks were made with the intent to ensure the future success of MySQL despite being purchased by its biggest competitor.

On March 27, 2018, an appeals court ruled Google violated copyright laws when it used Oracle's open-source Java software to build the Android platform in 2009.

"There is nothing fair about taking a copyrighted work verbatim and using it for the same purpose and function as the original in a competing platform," a panel of three Federal Circuit judges concluded.

[34] Many community members decided to leave for LibreOffice, which already had the support of Red Hat, Novell, Google, and Canonical.

[54] Two other virtualization technologies acquired from Sun, Oracle Secure Global Desktop and VirtualBox, remained as products.