2019-04-20 Saturday - Eclipse IDE v4.11 Release 2019-03 JSON Schema Validation Issues

During some recent testing of the latest release of the Eclipse IDE, v4.11, Release 2019-03 - I discovered some issues with JSON Schema Validation:

First:

While looking for a better JSON editor - I installed this plugin:

• Eclipse JSON Editor Plugin 
• https://marketplace.eclipse.org/content/json-editor-plugin 

But, I observed that

• It appears that when this plugin is installed - JSON Schema Validation (i.e. after registering the file pattern and schema URL via Window > Preferences > JSON > JSON Catalog) no longer works.

• I repeated this test several times, by uninstalling the plugin - confirming that Schema Validation worked - and then re-installing the plugin and confirming that Schema Validation no longer worked.

• I did not see any errors being logged to the Eclipse log file.

• Tested with Java JDK 12, on a Windows 10 laptop

 Issue #26 Submitted

• "Blocks JSON Schema Validation in Eclipse v4.11 (release 2019-03)"

• https://github.com/boothen/Json-Eclipse-Plugin/issues/26\

Second:

While experimenting with the JSON Schema Validation capabilities of the latest Eclipse release (v4.11, 2019-03) - I noted an error in the log (see my stackoverflow submission) - even though validation appeared to be working.

• relequestual replied soon after: "JSON Schema core dev here. Yeah this looks fine in terms of JSON Schema. No idea why an error is being throw" 

 Issue #546541 Submitted:

• "UnsupportedOperationException: Not a string: {"type":"string","format":"uri-reference"} thrown by JsonValue.java"
• https://bugs.eclipse.org/bugs/show_bug.cgi?id=546541
• (see my follow-up bug comments for additional information I found)

Subsequently:

• By changing the @schema string value from
•  "$schema": "http://json-schema.org/draft-07/schema#", 

• To:
•  "$schema": "http://json-schema.org/draft-04/schema#",

• It appears that the exception is no longer thrown. 

• However, when I change the string to either of the following: 
•  "$schema": "http://json-schema.org/draft-05/schema#",

• or
• "$schema": "http://json-schema.org/draft-06/schema#",

• ....a different error messages shows in the log - with a different exception is thrown. 

References:

• http://www.eclipse.org/webtools/
• http://git.eclipse.org/c/?q=webtools 
• http://git.eclipse.org/c/sourceediting/webtools.sourceediting.git/ 
• http://git.eclipse.org/c/sourceediting/webtools.sourceediting.git/tree/
• https://git.eclipse.org/c/sourceediting/webtools.sourceediting.git/tree/json/bundles/org.eclipse.json/src/org/eclipse/json/provisonnal/com/eclipsesource/json 
• https://git.eclipse.org/c/sourceediting/webtools.sourceediting.git/tree/json/bundles/org.eclipse.json/src/org/eclipse/json/provisonnal/com/eclipsesource/json/JsonValue.java

Observation: 

There are quite a few open bugs within the Eclipse WTP Source Editing and wst.json component - that have not been addressed in years...

• https://bugs.eclipse.org/bugs/buglist.cgi?bug_status=__open__&component=wst.json&list_id=18649565&product=WTP%20Source%20Editing