Craig
On Jul 31, 2006, at 10:15 PM, Patrick Linskey wrote: Yes, OpenJPA implements Statement, ResultSet, Connection, and maybe a couple other JDBC interfaces. See org.apache.openjpa.lib.jdbc.Delegating*. We do this for a number of reasons: to resolve database-specific bugs in a transparent fashion, to provide logging, to handle reference counting, etc. The pressing issue is that we must provide implementations of all of the methods in the various java.sql interfaces. The fact that we do not implement the new JDBC4 methods is why OpenJPA won't currently compile against JDK6. This is pretty easy to fix; take a look at org.apache.openjpa.lib.jdbc.DelegatingStatement to see how we handled this for JDBC3. Since we know that we never invoke the new methods, we can happily throw unsupported operation exceptions for the new methods. However, these unsupported methods do provide a challenge. While Kodo doesn't use any of these methods, our mechanism for implementing them is limiting, in that users who obtain Connections from Kodo will not be able to use the new JDBC3/JDBC4 methods in their own code. Ideally, we should provide some means for people to designate to OpenJPA that it should use a dynamic proxy to implement the unimplemented methods. This shouldn't be the default behavior, as the dynamic proxy will add overhead, but certainly could be desirable for some. I'll file an issue.
-Patrick -- Patrick Linskey BEA Systems, Inc.______________________________________________________________________ _ Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Monday, July 31, 2006 10:02 PM To: open-jpa-dev@incubator.apache.org Subject: Re: JDBC 4 (was: Was it just me?) You can access earlier versions of jdbc to compile against using special javac properties for library jars. But I don't know how maven deals with this. What specific errors are you getting when compiling against jdbc 4? I'm not aware of any additions that would make programs that compile against jdbc 3 not compile against jdbc 4. You don't *implement* any jdbc interfaces, do you? Craig On Jul 31, 2006, at 8:37 PM, Patrick Linskey wrote:BTW, you may be aware, but it doesn't compile on Java 6due to theJDBC interface changes. I'll add that to JIRA if its not there already.Yeah, we've had this problem in the past as well.Historically, we'vecreated special modified JDBC jars so that we can compileon earlierVM versions. How is this type of problem typically handledin Apache-land? Isn't this the other way around? If the additional methods are implemented to make it compile on Java 6, it will continue to be binary compatible with the earlier JDBC versions.Yes, that. Meant "so that we can run on earlier VM versions." So... how does Apache typically deal with this? The onlyalternate tothe way we've done things in the past is an approach thatuses dynamic_____________________________________________________________________ _proxies / auto-generated proxies / dynamically-modified classes. -Patrick_ Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.Craig RussellArchitect, Sun Java Enterprise System http://java.sun.com/products/ jdo408 276-5638 mailto:[EMAIL PROTECTED] P.S. A good JDO? O, Gasp!by email and then delete it.
Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:[EMAIL PROTECTED] P.S. A good JDO? O, Gasp!
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