Restore backwards compatibility

src/main/org/apache/tools/ant/taskdefs/Concat.java

@@ -595,7 +595,7 @@ public class Concat extends Task implements ResourceCollection {
      */
     @Deprecated
     public void setForce(boolean forceOverwrite) {
-        setOverwrite(forceOverwrite);
+        this.forceOverwrite = forceOverwrite;
     }
 
     /**
@@ -605,8 +605,9 @@ public class Concat extends Task implements ResourceCollection {
      *              input files.
      * @since Ant 1.8.2
      */
+    @SuppressWarnings("deprecated")
     public void setOverwrite(boolean forceOverwrite) {
-        this.forceOverwrite = forceOverwrite;
+        setForce(forceOverwrite);
     }
 
     /**

src/main/org/apache/tools/ant/taskdefs/compilers/DefaultCompilerAdapter.java

@@ -697,7 +697,8 @@ public abstract class DefaultCompilerAdapter
      */
     @Deprecated
     protected boolean assumeJava19() {
-        return assumeJava9();
+        return assumeJavaXY("javac1.9", JavaEnvUtils.JAVA_9)
+                || assumeJavaXY("javac9", JavaEnvUtils.JAVA_9);
     }
 
     /**
@@ -705,9 +706,9 @@ public abstract class DefaultCompilerAdapter
      * @return true if JDK 9
      * @since Ant 1.9.8
      */
+    @SuppressWarnings("deprecated")
     protected boolean assumeJava9() {
-        return assumeJavaXY("javac1.9", JavaEnvUtils.JAVA_9)
-                || assumeJavaXY("javac9", JavaEnvUtils.JAVA_9);
+        return assumeJava19();
     }
 
     /**