Solution:Unable to load perf ormance pack. Using Java I/O instead. Please ensure that wlntio.dll

Today, I am going to explain the installation steps & configuration of Oracle Weblogic 10.3.4 for SOA suite 11g (11.1.1.4) in a 64-bit windows environment. Because, of late, I have been seeing a lots of queries in forums with same query/issue (BEA-000438: loading performance pack issue) with no relevant answers. Probably this post would help in resolving all the issues;

1. First things first; Ensure that you download the correct version of the Weblogic installer (wls1034_generic.jar)

2. Download the 64-bit JDK/JRE of Oracle Java (Latest version on date is jdk-6u24-windows-x64.exe)
3. The generic 64-bit Weblogic installer doesn't come bundled with a 64-bit JVM. Hence install the Java downloaded in step 2 on your windows environment. Care must be taken to ensure that the default installation directory (C:\Program Files) is changed - Catch here is that Weblogic doesn't recognize WELL the Java installation directory with a space in folder name. So be sure to install the Java in a folder path where none of the folder names have a space (Eg. C:\Java)
4. Now from the command prompt, execute the following command to install the Weblogic 10.3.4 64-bit;
java -D64 -jar wls1034_generic.jar
[-D64 ensures that the weblogic installation is going to be on the 64-bit JDK.]
5. Follow steps to install the Weblogic 10.3.4 server - Installation will prompt for the JDK selection, choose C:\Java (You will find this information in documentation)
6. Now, when you start the server, you may find the following error;


<Error> <Socket> <BEA-000438> <Unable to load perf
ormance pack. Using Java I/O instead. Please ensure that wlntio.dll is in: 'C:\O
racle\fmwhome\wlserver_10.3\server\native\win\32;C:\Oracle\fmwhome\wlserver_10.3
\server\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Oracle\fmwhome\wlserver_10.3\serve
r\native\win\32\;C:\Oracle\fmwhome\wlserver_10.3\server\bin;C:\Program~\Java\jdk
1.6.0_24\jre\bin;C:\Program~\Java\jdk1.6.0_24\bin;C:\Oracle\fmwhome\wlserver_10.
3\server\native\win\32\oci920_8;C:\oraclexe\app\oracle\product\10.2.0\server\bin
;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem'

7. Go to the following location <<Weblogic_Home_Directory>>\wlserver_10.3\server\native\win\x64. Copy the wlntio.dll file and paste it under C:\Java\bin directory (if you have choosen to install Java in C:\Java).
8. Now, start the server and the error must be gone - Performance pack is now loaded in Weblogic 10.3.4