Fixed Javadoc warnings

Author: cowwoc

guava/pom.xml

@@ -56,6 +56,11 @@
 								<option>--override-methods</option>
 								<option>summary</option>
 							</additionalOptions>
+							<!--
+							Workaround for "The code being documented uses modules but the packages defined in
+							https://guava.dev/releases/${guava.version}/api/docs/ are in the unnamed module.
+							-->
+							<source>8</source>
 							<validateLinks>true</validateLinks>
 							<links>
 								<link>https://guava.dev/releases/${guava.version}/api/docs/</link>

jackson/pom.xml

@@ -56,6 +56,12 @@
 								<option>--override-methods</option>
 								<option>summary</option>
 							</additionalOptions>
+							<!--
+							Workaround for "The code being documented uses modules but the packages defined in
+							https://javadoc.io/doc/tools.jackson.core/jackson-databind/${jackson.version}/ are in the
+							unnamed module.
+							-->
+							<source>8</source>
 							<validateLinks>true</validateLinks>
 							<links>
 								<!-- BUG: https://github.com/maxcellent/javadoc.io/issues/200 -->

pom.xml

@@ -208,6 +208,11 @@
 									<option>--override-methods</option>
 									<option>summary</option>
 								</additionalOptions>
+								<!--
+								Workaround for "The code being documented uses modules but the packages defined in
+								https://guava.dev/releases/${guava.version}/api/docs/ are in the unnamed module.
+								-->
+								<source>8</source>
 								<validateLinks>true</validateLinks>
 								<links>
 									<link>https://guava.dev/releases/${guava.version}/api/docs/</link>