Recover weblogic Admin password.

Go to OEM instance home. In my case /ssd/oracle/gc_inst is instance home.

cd /ssd/oracle/gc_inst1/

Change directory to user_projects/domains/GCDomain/servers/EMGC_ADMINSERVER/security/
and open file boot.properties.

[root@core gc_inst]# cd user_projects/domains/GCDomain/servers/EMGC_ADMINSERVER/security/

[root@core security]# cat boot.properties 

# Generated by Configuration Wizard on Thu Jun 23 11:59:29 NPT 2016

username={AES}gSDr8lmhI2OXWEXXXXXXXXXXX+ZOmnyOkOtaRUZmJo8=

password={AES}fUCumT2yS3YBWvXXXXXXXXXXXx0NkHtdaBytrg1fBE=

[oracle@core servers]$ pwd
/ssd/oracle/gc_inst/user_projects/domains/GCDomain/servers
[oracle@core servers]$

Note the username data value and password data value.

Create a java file that will decrypt the encrypted form of the password. I have created java file with name recoverpwd.java with content below.

[root@core security]# cat > /tmp/recoverpwd.java

public class recoverpwd {

 public static void main(String[] args)

 {

  System.out.println(

  new weblogic.security.internal.encryption.ClearOrEncryptedService(

  weblogic.security.internal.SerializedSystemIni.getEncryptionService(args[0]

   )).decrypt(args[1]));

  }

}

Compile java with following command

javac /tmp/recoverpwd.java 

ls /tmp/recoverpwd.class

Export oracle environment with following command

 . /ssd/oracle/gc_inst1/user_projects/domains/GCDomain/bin/setDomainEnv.sh 

Verify environment variables are set properly

echo $DOMAIN_HOME

Decrypt password with the java and the encrypted password.

cd /tmp/

java -cp $CLASSPATH:. recoverpwd \
$DOMAIN_HOME {AES}gSDr8lmhI2OXWEMpOmMLy3UkN+ZOmnyOkOtaRUZmJo8=