EBS 12.2 Upgrade : Unable to launch owm (oracle wallet manager) GUI failing with error after JDK upgrade

EBS 12.2 Upgrade : Unable to launch owm (oracle wallet manager) GUI failing with error after JDK upgrade:

Error Details:

applprod.prod $ owm&
applprod.prod $ Exiting
java.lang.NullPointerException
        at oracle.ewt.lwAWT.BufferedApplet.<init>(Unknown Source)
        at oracle.sysman.emSDK.client.appContainer.WebApplication.<init>(WebApplication.java:752)
        at oracle.security.admin.wltmgr.owma.OwmaApp.<init>(Unknown Source)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
        at java.lang.Class.newInstance(Class.java:383)
        at oracle.sysman.emSDK.client.appContainer.WebApplication.main(WebApplication.java:3316)
Done.

CAUSE: After multiple attempts, identified JDK version 1.7.0_381 that is release with Apr 2023 CPU is not applicable for standalone webtier

I followed below steps and able to launch OWM successfully:

applprod.prod $ . /prod/ebs122/EBSapps.env run

  E-Business Suite Environment Information

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

  RUN File System           : /prod/ebs122/fs1/EBSapps/appl

  PATCH File System         : /prod/ebs122/fs2/EBSapps/appl

  Non-Editioned File System : /prod/ebs122/fs_ne

  DB Host: crmtest-lh.integration.manchester.ac.uk  Service/SID: PRODEBS

  Sourcing the RUN File System ...

applprod.prod $ 

applprod.prod $ cd $NE_BASE/inst/$CONTEXT_NAME/certs/Apache

applprod.prod $ ls -tlr

total 21

-rw-r--r--   1 applprodoinstall    9781 Apr  2 11:32 ewallet.p12

applprod.prod $ echo $FILE_EDITION

run

applprod.prod $ . $FMW_HOME/SetWebtier.env

applprod.prod $ cd $FMW_HOME/webtier

applprod.prod $ ./jdk/bin/java -version

java version "1.7.0_421"

Java(TM) SE Runtime Environment (build 1.7.0_421-b06)

Java HotSpot(TM) Server VM (build 24.421-b06, mixed mode)

applprod.prod $ ls -ld jdk*

drwxr-xr-x   7 applprodoinstall      14 Apr  2 11:00 jdk

drwxr-xr-x   7 applprodoinstall      14 Mar 13  2024 jdk_421

drwxr-xr-x   8 applprodoinstall      14 Mar 17 14:41 jdk_7.85

drwxr-x---   7 applprodoinstall      13 Mar 17 14:34 jdk_bug24797348

applprod.prod $ 

NOTE: Current JDK version I am using 1.7.0_421 so try to replace it old version below 1.7.0_381 till you complete owm steps and later you can revert it to 1.7.0_421

Here I used existing old jdk backup version 85, you can download the same form oracle support

applprod.prod $ mv jdk jdk_421

applprod.prod $ cp -r jdk_7.85 jdk

applprod.prod $ ./jdk/bin/java -version

java version "1.7.0_85"

Java(TM) SE Runtime Environment (build 1.7.0_85-b33)

Java HotSpot(TM) Server VM (build 24.85-b07, mixed mode)

applprod.prod $ pwd

/prod/ebs122/fs1/FMW_Home/webtier

applprod.prod $ export PATH=$FMW_HOME/webtier/bin:$FMW_HOME/oracle_common/bin:$PATH

applprod.prod $ cd $NE_BASE/inst/$CONTEXT_NAME/certs/Apache

applprod.prod $ echo $DISPLAY

localhost:19.0

applprod.prod $ owm&

[1]     9172

applprod.prod $ pwd

/prod/ebs122/fs_ne/inst/PRODEBS_crmtk/certs/Apache

applprod.prod $ Done.

[1] +  Done                    owm&

applprod.prod $

Revert JDK to current version:

cd $FMW_HOME/webtier

applprod.prod $ mv jdk jdk_7.85

applprod.prod $ cp -r jdk_421 jdk

applprod.prod $./jdk/bin/java -version

java version "1.7.0_421"

Optional: Follow below steps if you want to view exiting wallet details and enable auto-login

owm &  
From the menu, click Wallet
Click Open
Answer Yes when prompted:
Your default wallet directory does not exist.
Do you want to continue?
On the Select Directory screen, change the directory to your fully qualified wallet directory $NE_BASE/inst/$CONTEXT_NAME/certs/Apache and click OK.
Enter your wallet password and click OK.
From the menu, click Wallet
select the Auto Login check box.
From the menu, click Wallet
Click Save
From the menu, click Wallet
Click Exit

Happy troubleshooting, please comment if you need any further help 👍