Fix deprecated API usage and update Java source/target to 17

[Copilot]

The build produces deprecation warnings and uses APIs marked for removal when compiled with Java 21 (the CI runtime). Java 8 source/target is also flagged as obsolete and will stop working in a future JDK.

Changes

• pom.xml: maven.compiler.source/target 1.8 → 17
• DbInitializer.java, StandaloneUtil.java, MainFrame.java: Replace deprecated Class.newInstance() with getDeclaredConstructor().newInstance()
• MainFrame.java: getMenuShortcutKeyMask() → getMenuShortcutKeyMaskEx(); fix raw Class types to Class<?>; add serialVersionUID
• TomcatManager.java: Replace AccessControlException (deprecated for removal) with SecurityException
• .gitignore: Add *.class

// Before
Class.forName("org.mariadb.jdbc.Driver").newInstance();
int key = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
Class Application = Class.forName("com.apple.eawt.Application");

// After
Class.forName("org.mariadb.jdbc.Driver").getDeclaredConstructor().newInstance();
int key = Toolkit.getDefaultToolkit().getMenuShortcutKeyMaskEx();
Class<?> applicationClass = Class.forName("com.apple.eawt.Application");

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• mavenrepo.openmrs.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/openmrs-standalone/openmrs-standalone org.codehaus.plexus.classworlds.launcher.Launcher clean install -pl . (dns block)
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/openmrs-standalone/openmrs-standalone org.codehaus.plexus.classworlds.launcher.Launcher clean compile -pl pom-step-05.xml (dns block)
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/openmrs-standalone/openmrs-standalone org.codehaus.plexus.classworlds.launcher.Launcher compile -pl pom-step-05.xml -Dmaven.test.skip=true (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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