Authentication failed with error as "Invalid sign in" when tried to login oim console

When we tried to login to oimconsole with xelsysadm user, it failed and gave error as "Invalid sign in".

When we checked in oim managed server log, we found below message.
at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
Caused by: oracle.ucp.UniversalConnectionPoolException: Error during pool creation in Universal Connection Pool Manager MBean: oracle.ucp.UniversalConnectionPoolException: Error during pool creation in Universal Connection Pool Manager: oracle.ucp.UniversalConnectionPoolException: Universal Connection Pool already exists in the Universal Connection Pool Manager. Universal Connection Pool cannot be added to the Universal Connection Pool Manager
        at oracle.ucp.util.UCPErrorHandler.newUniversalConnectionPoolException(UCPErrorHandler.java:368)
        at oracle.ucp.util.UCPErrorHandler.throwUniversalConnectionPoolException(UCPErrorHandler.java:49)
        at oracle.ucp.util.UCPErrorHandler.throwUniversalConnectionPoolException(UCPErrorHandler.java:80)
        at oracle.ucp.admin.UniversalConnectionPoolManagerMBeanImpl.createConnectionPool(UniversalConnectionPoolManagerMBeanImpl.java:316)
        at oracle.ucp.jdbc.PoolDataSourceImpl.startPool(PoolDataSourceImpl.java:631)
        ... 117 more
Exception encountered when trying to login as admin {0}

javax.security.auth.login.LoginException: javax.security.auth.login.LoginException: java.lang.SecurityException: [Security:090304]Authentication Failed: User oiminternal javax.security.auth.login.FailedLoginException: [Security:090302]Authentication Failed: User oiminternal denied
        at weblogic.security.auth.login.UsernamePasswordLoginModule.login(UsernamePasswordLoginModule.java:199)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769)
        at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:684)
        at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
        at javax.security.auth.login.LoginContext.login(LoginContext.java:579)
        at Thor.API.Security.LoginHandler.weblogicLoginHandler.login(weblogicLoginHandler.java:62)
        at oracle.iam.platform.OIMClient.login(OIMClient.java:134)
        at oracle.iam.platform.OIMClient.login(OIMClient.java:114)
        at oracle.iam.platform.OIMInternalClient.loginAsOIMInternal(OIMInternalClient.java:102)
        at oracle.iam.scheduler.impl.util.SchedulerUtil.getSchedulerService(SchedulerUtil.java:841)


Reason:It seems that it's unable to get password for xelsysadm user from database.

Solution: Go to weblogic console and then

1.  myrealm->providers-> OIMAuthenticationProvider-> provider specific
2. Click lock and edit and update the correct OIM schema password and save it.
3. Once done, restart all Admin and managed servers