[OPENMEETINGS-2787] Startup script and clustering instructions are up…

…dated

openmeetings-server/src/main/assembly/scripts/openmeetings.service

@@ -31,7 +31,7 @@ Environment=CATALINA_HOME=/opt/openmeetings
 Environment=CATALINA_BASE=/opt/openmeetings
 Environment='JDK_JAVA_OPTIONS=--add-modules java.se --add-exports java.base/jdk.internal.ref=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.nio=ALL-UNNAMED --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.management/sun.management=ALL-UNNAMED --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED -XX:+DisableAttachMechanism'
 Environment='CATALINA_OPTS=-Xms1G -Xmx4G -server -XX:+UseParallelGC'
-Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'
+Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom -Dopenjpa.serialization.class.blacklist=* -Dopenjpa.serialization.class.whitelist=[B,java.util,org.apache.openjpa,org.apache.openmeetings.db.entity'
 
 ExecStart=/opt/openmeetings/bin/startup.sh
 ExecStop=/opt/openmeetings/bin/shutdown.sh

openmeetings-server/src/site/xdoc/Clustering.xml

@@ -83,6 +83,13 @@
 						set correct server address, login and password. Also uncomment following line:
 						<source><![CDATA[<property name="openjpa.RemoteCommitProvider" value="tcp(Addresses=127.0.0.1)" />]]></source>
 					</li>
+					<li>
+						<div class="bd-callout bd-callout-danger">
+							IMPORTANT: Please ensure your startup scripts has OpenJPA black/white list definition
+						</div>
+						<p>Here is an example:</p>
+						<code>JAVA_OPTS="-Dopenjpa.serialization.class.blacklist=* -Dopenjpa.serialization.class.whitelist=[B,java.util,org.apache.openjpa,org.apache.openmeetings.db.entity"</code>
+					</li>
 				</ul>
 			</subsection>
 			<subsection name="File systems">