JDK8 in WinXP

 As we all know JDK8 installer doesn't work in WinXP.
This is the best solution found at stackoverflow.com :

http://stackoverflow.com/questions/20965564/installing-jdk8-on-windows-xp-advapi32-dll-error#tab-top

This happens because Oracle dropped support for Windows XP (which doesn't have RegDeleteKeyExA used by the installer in its ADVAPI32.DLL by the way) as described in http://mail.openjdk.java.net/pipermail/openjfx-dev/2013-July/009005.html. Yet while the official support for XP has ended, the Java binaries are still (as of Java 8u20 EA b05 at least) XP-compatible - only the installer isn't...
Because of that, the solution is actually quite easy:

1. get 7-zip (or any other quality archiver), unpack the distribution .exe manually, it has one .zip file inside of it (tools.zip), extract it too,
   
2. use unpack200 from JDK8 to unpack all .pack files to .jar files (older unpacks won't work properly); JAVA_HOME environment variable should be set to your Java unpack root, e.g. "C:\Program Files\Java\jdk8" - you can specify it implicitly by e.g.
   

   SET JAVA_HOME=C:\Program Files\Java\jdk8

   • Unpack all files with a single command (in batch file):
     

     FOR /R %%f IN (*.pack) DO "%JAVA_HOME%\bin\unpack200.exe" -r -v "%%f" "%%~pf%%~nf.jar"

   • Unpack all files with a single command (command line from JRE root):
     

     FOR /R %f IN (*.pack) DO "bin\unpack200.exe" -r -v "%f" "%~pf%~nf.jar"

   • Unpack by manually locating the files and unpacking them one-by-one:
     

     %JAVA_HOME%\bin\unpack200 -r packname.pack packname.jar

   where packname is for example rt
3. point the tool you want to use (e.g. Netbeans) to the %JAVA_HOME% and you're good to go.

Note: you probably shouldn't do this just to use Java 8 in your web browser or for any similar reason (installing JRE 8 comes to mind); security flaws in early updates of major Java version releases are (mind me) legendary, and adding to that no real support for neither XP nor Java 8 on XP only makes matters much worse. Not to mention you usually don't need Java in your browser (see e.g. http://nakedsecurity.sophos.com/2013/01/15/disable-java-browsers-homeland-security/ - the topic is already covered on many pages, just Google it if you require further info). In any case, AFAIK the only thing required to apply this procedure to JRE is to change some of the paths specified above from \bin\ to \lib\ (the file placement in installer directory tree is a bit different) - yet I strongly advise against doing it.

See also: How can I get the latest JRE / JDK as a zip file rather than EXE or MSI installer?, JRE 1.7 returns: java/lang/NoClassDefFoundError: java/lang/Object

----------------

From
https://blogs.oracle.com/henrik/entry/the_future_of_java_on

Q: Can I install JDK 8 on Windows XP? Will it work?
A: The installer does not work on Windows XP. You can unpack it manually and it will likely run fine.

Project Euler #125

It is interesting how I analyzed this problem --> first attempt was doing an horrible brute force which  would take milliards of years to complete.

Classical problem, where I had to re-design the solution, after getting a couple of "duplicate numbers" (also incorporated to the problem). Simple & Hard. This is the taxonomy of problems I must create.

My performance is a little slow:

Last 10 Problems Solved

1	Problem 125	11 Sep 14 (14:56)
2	Problem 102	11 Jan 14 (13:58)

OC4J: precompiling JSP

JSPs can be precompiled by OC4J tool: ojspc
http://sqltech.cl/doc/oas10gR31/web.1013/b28961/ojspc.htm

Similar to my last post for WLS:

ojspc -verbose -addclasspath D:\web-oc4j-v3\dist\foo.jar;D:\web-oc4j-v3\dist\lib\bar.jar qux.jsp

As, you can see you need to add libraries to "addclasspath" and the jsp file, or wildcard.

Remember to define environment local variables:

i.e.:

set JAVA_HOME=C:\oracle\jdk150_11
set ORACLE_HOME=D:\oracle\oc4j_extended_101340
set PATH=%ORACLE_HOME%\j2ee\home\jsp\bin;%PATH%
set PATH=%JAVA_HOME%\bin;%PATH%

WLS: Precompile ear/war EJB/JSP

WLS has a very useful tool to precompile EJBs and JSPs so we can avoid extra overhead at runtime on the container.

It is called APPC, this tool calls underneath to jspc and ejbc to achieve this task.
http://docs.oracle.com/cd/E17904_01/web.1111/e13719/appc_ejbc.htm#EJBPG1088

After calling setDomainEnv.sh (.cmd) we can execute directly: weblogic.appc [files]

Also, we can compile only JSPs files with: weblogic.jspc [files]
http://docs.oracle.com/cd/E17904_01/web.1111/e13712/reference.htm#i57791

It is recommended to use it at development time as well, so we can hit compilation errors before the first request on the web container.

It exists the Ant task as well: wlapcc

Sample:

java weblogic.jspc -forceGeneration -keepgenerated -verboseJspc -d d:\tmp\export\ -classpath .;D:\proj\webapp-wl-v4\web\WEB-INF\classes;D:\proj\webapp-wl-v4\foo.jar;D:\proj\webapp-wl-v4\lib\bar.jar index.jsp

Spring in WLS 12.1.3

Support for Spring Framework on WebLogic Server 12.1.3

WebLogic Server 12.1.3 supports the WebLogic Server/Spring integration features described in this document with Spring Framework versions 3.0.x, 3.1.x, and 4.0.x (note that version 3.2.x is not supported).

Other versions of Spring may be used in WebLogic Server applications without using the integration features described in this document, similar to the way other open source technologies may be used in WebLogic Server applications. In such cases, Oracle does not support the WebLogic Server/Spring integration features, but does provide support for WebLogic Server itself, and does provide problem resolution assistance if WebLogic Server is not providing documented capabilities.

http://docs.oracle.com/middleware/1213/wls/SPRNG/intro.htm#BHCDGJFA

JVM for VisualVM

When trying to execute VisualVM you may get:

Cannot find Java 1.7 or higher.
(for 1.3.8)
or

Cannot find Java 1.6 or higher.
 (for 1.3.4)

VisualVM only takes parameters form JVM through arguments or values given at:

visualvm_138/etc/visualvm.conf
(/Applications/VisualVM.app/Contents/Resources/visualvm/etc)

# Default location of JDK:
#
# It can be overridden on command line by using --jdkhome


# Be careful when changing jdkhome.
# There are two VisualVM launchers for Windows (32-bit and 64-bit) and
# installer points to one of those in the VisualVM application shortcut
# based on the Java version selected at installation time.
#
#visualvm_jdkhome="/path/to/jdk"

Modify :

visualvm_jdkhome="/path/to/jdk"

to your JDK path.

i.e.:

visualvm_jdkhome=C:\oracle\jdk1.7.0_45

visualvm_jdkhome=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home


This is the same for Netbeans 8.0.1 Portable, but the variable is called: netbeans_jdkhome

- log can be retrieve by:
visualvm -J-Djava.util.logging.config.file=${path_to_jdk_logging_config_file} 

or in the credits (about), there is a bottom to show the standard output (and path to it).

WLS Server timeout: ServerLifeCycleTimeoutVal

I wasn't able to start correctly my Admin Server, and the following BEA message appeared in the log:

<BEA-000378> <Server failed to shutdown within the configured timeout of 30 seconds. The server process will exit now.>

 This is for MBean attribute: ServerLifeCycleTimeoutVal

That can be set as System Property at java startup  command line:

        -Dweblogic.ServerLifeCycleTimeoutVal=XXX

where XXX are seconds for timeout.

This can be also configured thru Admin Console at:
(increasing the Server LifeCycle Timeout before executing the force shutdown)

   Domain -> Environment -> Servers -> YOUR_SERVER -> Control --> Start/Stop



More details at:

http://docs.oracle.com/cd/E21764_01/apirefs.1111/e14397/T3Srvr.html
http://docs.oracle.com/cd/E21764_01/web.1111/e13708/server_life.htm
http://docs.oracle.com/cd/E17904_01/apirefs.1111/e13951/core/index.html

"Blooper" Contest

A old contest I solved on 2009 from Kadon !

The prize:

N Is a Number: A Portrait of Paul Erdös (1993)

de George Paul Csicsery

Documental que habla de la vida del prolífico matemático Paul Erdös, su simpática excentricidad, reuniones con otros matemáticos alrededor del mundo en un época en la cual viajar tanto no era común.

Un húngaro judio sobreviviente de la segunda guerra donde la política también le importaba, pero como siempre la veia de una forma lúdica. Son varios cortos de conversaciones con él, sus anécdotas y la explicación de el coloquial Número de Erdös, con muy simples tomas de nivel amauter que sin duda lo hicieron otros colegas de él.

Del punto vista cineasta no atrae demasiado, pero si conocer de la vida de una de las grandes mentes matemáticas que ayudó a escribir más de 1500 papers y no es masivamente conocido.

Distinctive Recipes, 2nd Ed.: 12.1.2 + 12.1.1 (and 10.3.x)

This is the Second Edition of Oracle WebLogic Server 12c: Distinctive Recipes: Architecture, Development and Administration, where new recipes are added and several have changed a lot, including differences from 12.1.1 (and 11g) to the new architectural design of 12.1.2 (and beyond based on the road-map).

After Oracle acquisition, WLS always was considered the main tool for Middleware, and several changes were planned for it, now it is the time and this book provides detailed recipes to take advantage of them and resolves issues in a practical and quick way.

Important new chapters from new features were added, related to Node Managers, JMS and Distributed Destinations, Cluster Targeted JMS, Server Templates, among others.

It is a new upgrade for WLS 12.1.2, including tips & tricks to get the best of this world class application container.