Atlassian Confluence SDK Problem starting App 404

when starting a Confluence plugin I always get the following error:

[INFO] [talledLocalContainer] 2020-08-06 20:48:58,116 ERROR [main] [ContainerBase.[Catalina].[localhost].[/confluence]] log Exception sending context initialized event to listener instance of class [com.atlassian.confluence.setup.ConfluenceConfigurationListener]
INFO] [talledLocalContainer] java.lang.ExceptionInInitializerError
[INFO] [talledLocalContainer] 	at com.ibm.icu.text.Collator.<clinit>(Collator.java:946)
[INFO] [talledLocalContainer] 	at java.lang.Class.forName0(Native Method)
[INFO] [talledLocalContainer] 	at java.lang.Class.forName(Class.java:264)
[INFO] [talledLocalContainer] 	at org.h2.value.CompareMode.<clinit>(CompareMode.java:57)
[INFO] [talledLocalContainer] 	at org.h2.engine.SessionRemote.<init>(SessionRemote.java:95)
[INFO] [talledLocalContainer] 	at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:116)
[INFO] [talledLocalContainer] Aug 06, 2020 8:48:58 PM org.apache.catalina.core.StandardContext startInternal
[INFO] [talledLocalContainer] 	at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:100)
[INFO] [talledLocalContainer] 	at org.h2.Driver.connect(Driver.java:69)
[INFO] [talledLocalContainer] SEVERE: One or more listeners failed to start. Full details will be found in the appropriate container log file
[INFO] [talledLocalContainer] 	at org.h2.server.TcpServer.initManagementDb(TcpServer.java:92)
[INFO] [talledLocalContainer] 	at org.h2.server.TcpServer.start(TcpServer.java:238)
[INFO] [talledLocalContainer] Aug 06, 2020 8:48:58 PM org.apache.catalina.core.StandardContext startInternal
[INFO] [talledLocalContainer] 	at org.h2.tools.Server.start(Server.java:484)
[INFO] [talledLocalContainer] SEVERE: Context [/confluence] startup failed due to previous errors
[...]
[INFO] [talledLocalContainer] Aug 06, 2020 8:49:07 PM org.apache.coyote.AbstractProtocol start
[INFO] [talledLocalContainer] INFO: Starting ProtocolHandler ["http-nio-1990"]
[INFO] [talledLocalContainer] Aug 06, 2020 8:49:07 PM org.apache.coyote.AbstractProtocol start
[INFO] [talledLocalContainer] INFO: Starting ProtocolHandler ["ajp-nio-8009"]
[INFO] [talledLocalContainer] Aug 06, 2020 8:49:07 PM org.apache.catalina.startup.Catalina start
[INFO] [talledLocalContainer] INFO: Server startup in 29245 ms
[INFO] [talledLocalContainer] Tomcat 9.x started on port [1990]
[INFO] confluence started successfully in 103s at http://localhost:1990/confluence
[INFO] Type Ctrl-C to shutdown gracefully

I have tried several plugins and in Windows, Mac and Ubuntu. Unfortunately I always get this error when starting the current and also an older SDK. I have tried Oracle and OpenJdk, both version 8.
The result is a 404 page when calling http://127.0.0.1:1990/confluence

My Setting

ATLAS Version:    8.2.2
ATLAS Home:       /usr/share/atlassian-plugin-sdk-8.2.2
ATLAS Scripts:    /usr/share/atlassian-plugin-sdk-8.2.2/bin
ATLAS Maven Home: /usr/share/atlassian-plugin-sdk-8.2.2/apache-maven-3.5.4
AMPS Version:     8.1.0
--------
Executing: /usr/share/atlassian-plugin-sdk-8.2.2/apache-maven-3.5.4/bin/mvn --version -gs /usr/share/atlassian-plugin-sdk-8.2.2/apache-maven-3.5.4/conf/settings.xml
Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-17T20:33:14+02:00)
Maven home: /usr/share/atlassian-plugin-sdk-8.2.2/apache-maven-3.5.4
Java version: 1.8.0_265, vendor: Private Build, runtime: /usr/lib/jvm/java-8-openjdk-amd64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.4.0-42-generic", arch: "amd64", family: "unix"

The Tomcat log does not contain any errors...

Do you have the same problem, or do you know a solution?

For all who also have this problem - the solution is to use a Java 8 version older than u261 or a Confluence version bigger than 7.0.0

Just to help others who come to this question as well with the same issue as both of us, You need to edit the pom.xml file and update the following properties:

• project > properties > confluence.version
• project > properties > confluence.data.version

The values are the version found on the confluence server page.
Finally, make sure to run atlas-clean then you can run atlas-run.