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public void init() {
  getCspSettings().blocking().disabled();
}

For more details see CSP paragraph .

Changes

Component placeholders and form hidden fields

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Wicket used custom classes from package org.apache.wicket.util.time to handle and manipulate time entities such as "duration" or "current instant".
These classes have been replaced with standard Java 8 classes java.time.Duration and java.time.Instant.

Deprecate src/main/java/org/apache/wicket/util/collections/MicroMap.java from wicket-util 

Jira
server ASF JIRA columns key,summary,type,created,updated,due,assignee,reporter,priority,status,resolution serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key WICKET-6783

Map#of(Object, Object) should be used instead

Deprecate ModalWindow from wicket-extension

Jira
server ASF JIRA columns key,summary,type,created,updated,due,assignee,reporter,priority,status,resolution serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key WICKET-6666

ModalWindow was deprecated and its usage should be replaced with the new ModalDialog implementation.

Removals

Utility class available in JDK is removed 

Jira
server ASF JIRA columns key,summary,type,created,updated,due,assignee,reporter,priority,status,resolution serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key WICKET-6783

wicket-util/src/main/java/org/apache/wicket/util/collections/ConcurrentHashSet.java

Removed from wicket-core all the deprecated classes

Jira
server ASF JIRA columns key,summary,type,created,updated,due,assignee,reporter,priority,status,resolution serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key WICKET-6562

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