Merge ~vpa1977/ubuntu/+source/libmatthew-java:java21-ftbfs into ubuntu/+source/libmatthew-java:ubuntu/devel

[Vladimir Petko]

This MP resolves Java 21 ftbfs.
Note: this mp replaces -source with --release fixing #1049791 as old packaging produced bytecode with the level of the compiling jdk.

PPA: ppa:vpa1977/october-21 [1]

Changes:
 - Use java_compat_level variable provided by java-common to adjust -source/-target level to the minimum required by the default Java

Testing:
 - rebuild in default Java 21 ppa[2]
 - piuparts test [3]

[1] https://launchpad.net/~vpa1977/+archive/ubuntu/october-21
[2] https://launchpad.net/~vpa1977/+archive/ubuntu/gettext-21/+sourcepub/15775946/+listing-archive-extra
[3] https://bugs.launchpad.net/ubuntu/+source/libmatthew-java/+bug/2052572/comments/1

diff --git a/debian/changelog b/debian/changelog
index ad133b5..270f736 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,11 @@
+libmatthew-java (0.8.1-2ubuntu1) noble; urgency=medium
+
+  * d/rules: use java_compat_level variable provided by java-common to
+    adjust --release level to the minimum required by the
+    default Java (LP: #1049791, LP: #2052572).
+
+ -- Vladimir Petko <[e-mail]>  Wed, 07 Feb 2024 14:00:13 +1300
+
 libmatthew-java (0.8.1-2) unstable; urgency=medium
 
   * add patch to fix javadoc error (FTBFS with OpenJDK 17)
diff --git a/debian/control b/debian/control
index b9ca8a7..a8d4966 100644
--- a/debian/control
+++ b/debian/control
@@ -1,7 +1,8 @@
 Source: libmatthew-java
 Section: java
 Priority: optional
-Maintainer: Debian IoT Maintainers <[e-mail]>
+Maintainer: Ubuntu Developers <[e-mail]>
+XSBC-Original-Maintainer: Debian IoT Maintainers <[e-mail]>
 Uploaders: Thorsten Alteholz <[e-mail]>
 Build-Depends: debhelper-compat (= 11),
                docbook-to-man,
diff --git a/debian/rules b/debian/rules
index 1be0fb6..51c8e53 100755
--- a/debian/rules
+++ b/debian/rules
@@ -1,4 +1,5 @@
 #!/usr/bin/make -f
+include /usr/share/java/java_defaults.mk
 
 %:
 	dh $@ --with javahelper
@@ -9,7 +10,7 @@ override_dh_auto_build:
 			  JAVAH=/usr/lib/jvm/default-java/bin/javah \
 			  JAVADOC=/usr/lib/jvm/default-java/bin/javadoc \
 			  JAVADOCFLAGS="-quiet -author -link /usr/share/doc/default-jdk-doc/api/" \
-                          JVERCFLAGS="-source 1.7" \
+                          JVERCFLAGS="--release $(java_compat_level)" \
 			  JAR=/usr/bin/fastjar \
 			  PREFIX=/usr \
 			  all doc