Previously reported error [NoSuchMethodError in o.j.java.locator.JarURLClassLocator:533]; SEVERE: Uncaught Exception java.lang.NoSuchMethodError: ADF; Oracle

Error Message:

 oracle.ideimpl.feedback2.client.FeedbackManagerImpl uncaughtException SEVERE: Uncaught Exception java.lang.NoSuchMethodError: oracle.ide.net.JarIndex.getInstance(Ljava/net/URL;Z)Loracle/ide/net/JarIndex;

Solution:

CHANGES

 You've recently applied a patch.

CAUSE

In this case, the issue was seen after applying a new ADF Bundle Patch.  The issue is not seen after applying the previous ADF BUNDLE PATCH 12.2.1.3.190924 (30347629) and only occurs with ADF BUNDLE PATCH 12.2.1.3.0.200311 (31021968) and up.

It's assumed that one of the fixes included in the newer ADF Bundle Patches requires a clean restart of JDeveloper, even though the patch readme does not include this step.

SOLUTION

Clear the JDeveloper cache.  To do this, start JDeveloper using the "-clean" option. 
For example, in a Linux development environment, the steps are like:

1. Open a terminal window and navigate to the JDeveloper executable directory (in the below command, replace the value of <ORACLE_HOME> with the path to your JDeveloper install directory).
   
   [oracle@machine ~]$ cd <ORACLE_HOME>/jdeveloper/jdev/bin
2. Start JDeveloper.
   
   [oracle@machine bin]$ jdev -clean

https://community.oracle.com/tech/developers/discussion/4198273/severe-performance-issues-with-jdeveloper-12-2-1-3