Some Dec/2013 Notes

1) Some useful JVM params
http://blog.joda.org/2011/08/printcompilation-jvm-flag.html
https://wikis.oracle.com/display/HotSpotInternals/PrintAssembly
http://classparser.blogspot.sg/2010/03/hsdis-i386dll.html

2) UEditor from baidu

http://ueditor.baidu.com

3) How to check if it’s a postback in jsf 1 & 2:

http://stackoverflow.com/a/5266472/382180

4) A nice timeline javascript library:

http://timeline.knightlab.com/

5) Oracle autonomous_transaction (difference with nested transaction; autonomous proecedure/function/trigger etc):

http://docs.oracle.com/cd/B19306_01/appdev.102/b14261/autonotransaction_pragma.htm

Useful for logging, shadow table etc.

6) Oracle database never block a read on rows even if the rows is/are locked by another session; the resultset will be a fixed snapshot, the rows are fixed (multi-version):

eg: one session opened a cursor to read selection result on a table, during which all rows are deleted and committed in another session, the first session could continue reading the rows using that cursor.

7) Some developer tools collection, could check this list first whenever one needs a tool:

http://www.hanselman.com/blog/ScottHanselmans2014UltimateDeveloperAndPowerUsersToolListForWindows.aspx

8) Guava v15.0 couldn’t be deployed to Weblogic 12c:

http://stackoverflow.com/a/19627096/382180

9) Java XML Parser error: “Exception in thread “main” java.lang.UnsupportedOperationException: This parser does not support specification “null” version “null” “

Solution one, add following jvm setting:

-Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl

Other solutions:

http://www.jroller.com/navanee/entry/unsupportedoperationexception_this_parser_does_not

http://colorcoding.wordpress.com/2010/02/17/unsupportedoperationexception-and-xml-parser-versions/

10) BTrace Project, it could change running jvm’s classes:

https://kenai.com/projects/btrace/pages/Home

11) Workaround for Lov bug: selected invalid Lov value appears not set immediately but validation error message is shown when user moves to the next row.

Workaround is: set ExceptionMode of the data control to “immediate” in DataBinding.cpx file.

http://andrejusb.blogspot.sg/2013/12/workaround-for-infamous-bug-13626875.html

12) Git revert local changes:

http://stackoverflow.com/questions/52704/how-do-you-discard-unstaged-changes-in-git

Quick workaround is:

git stash save --keep-index

git stash drop

13) af:tree af:treeTable get node depth:
https://community.oracle.com/thread/2154226

<af:outputText value="#{bindings.Employees.treeModel.depth}"/>

14) af:fileDownloadActionListener or af:exportCollectionActionListener not working (the bean method is not called)
https://community.oracle.com/message/10902026
I think I encounter same problem of this post, workaround is disable ppr in adf-config.xml
but one need to revisit existing functions if it’s relying on this feature.