Fix some compile warnings (#2919)

* Fix some compile warnings
* Some classes made final
* JPA entities made not serializable

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-repository/hawkbit-repository-test/src/main/java/org/eclipse/hawkbit/repository/test/util/AbstractIntegrationTest.java

@@ -123,12 +123,10 @@ public abstract class AbstractIntegrationTest {
     protected static final Pageable UNPAGED = Pageable.unpaged();
 
     protected static final URI LOCALHOST = URI.create("http://127.0.0.1");
-    protected static final int DEFAULT_TEST_WEIGHT = 500;
     protected static final Random RND = TestdataFactory.RND;
 
     /**
-     * Number of {@link DistributionSetType}s that exist in every test case. One
-     * generated by using
+     * Number of {@link DistributionSetType}s that exist in every test case. One generated by using
      * {@link TestdataFactory#findOrCreateDefaultTestDsType()} and three
      * {@link SystemManagement#getTenantMetadata()};
      */

hawkbit-repository/hawkbit-repository-test/src/main/java/org/eclipse/hawkbit/repository/test/util/SecurityContextSwitch.java

@@ -139,6 +139,7 @@ public class SecurityContextSwitch {
         // in some cases it could be serializable, e.g. if got via {@link java.lang.reflect.AnnotatedElement} (see javadoc) or WithUserImpl,
         // and in some cases it used to be serialized, e.g. in {@link SecurityContextSerializer#JavaSerialization.serialize},
         // must not be made transient!
+        @SuppressWarnings("serial")
         private final WithUser annotation;
 
         WithUserSecurityContext(final WithUser annotation) {
@@ -197,6 +198,9 @@ public class SecurityContextSwitch {
 
     private static class WithUserImpl implements WithUser, Serializable {
 
+        @Serial
+        private static final long serialVersionUID = 1L;
+
         private final String principal;
         private final String tenant;
         private final boolean autoCreateTenant;