R12.2 When Launch Account Hierarchy Manager (AHM) get "Error: The webpage cannot be found HTTP 400" or "Bad Request" "The request could not be understood by server due to malformed syntax"

(Doc ID 1918522.1)

Last updated on SEPTEMBER 28, 2016

Applies to:

Oracle General Ledger - Version 12.1 and later
Information in this document applies to any platform.
Account Hierarchy Manager (AHM)
Merged with 2064733.1

Symptoms

When attempting to launch Account Hierarchy Manager (AHM) it does not start and the following error occurs:

Error
-------
Bad Request
The request could not be understood by server due to malformed syntax.

Also:
Error: The webpage cannot be found  HTTP 400

Also:
Error: 400 Bad Request

The following is shown in the java console logfile:
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at oracle.forms.engine.Heartbeat.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
basic: Finished applet teardown
Exception in thread "AWT-EventQueue-2" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(Unknown Source)
at java.util.concurrent.locks.ReentrantLock.unlock(Unknown Source)
at java.awt.EventQueue.getNextEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

STEPS
-----------------------
The issue can be reproduced at will with the following steps:
1. General Ledger Super User
2. Navigate Setup > Accounts > Manager

Cause

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