propertyName, valueClass == null ? null : valueClass.getName(),
                                    valueClass == null ? null : valueClass.getClassLoader(), convertedValue,
                                    targetClass == null ? null : targetClass.getName(),
                                    targetClass == null ? null : targetClass.getClassLoader() }).initCause(t);
                }

                }
            """
        ) {
            assertHasErrors(
                "Method com.example.Source.foo(): From non-null returning to null-unmarked returning breaking change.",
                "Method com.example.Source.baz(): From non-null returning to null-unmarked returning breaking change.",
            )
            assertHasNoWarning()

    }
    // ------------------------------------------------------------------------
    public MetadataGraphVertex addVertex(ArtifactMetadata md) {
        if (md == null) {
            return null;
        }

        checkVertices();

        MetadataGraphVertex v = findVertex(md);
        if (v != null) {
            return v;
        }

        v = new MetadataGraphVertex(md);

        // and we want artifact resolution to only return the system scoped artifact itself.
        //
        if (artifact.getScope() != null && artifact.getScope().equals(Artifact.SCOPE_SYSTEM)) {
            return new ResolutionGroup(null, null, null);
        }

        ResolutionGroup cached = cache.get(
                artifact,
                request.isResolveManagedVersions(),

        CIFSException last = null;
        final RequestWithPath rpath = request instanceof RequestWithPath r ? r : null;
        final String savedPath = rpath != null ? rpath.getPath() : null;
        final String savedFullPath = rpath != null ? rpath.getFullUNCPath() : null;

        final String fullPath = "\\" + loc.getServer() + "\\" + loc.getShare() + loc.getUNCPath();

            VersionResult result) {
        Versioning versioning = null;
        try {
            if (metadata != null) {
                try (SyncContext syncContext = syncContextFactory.newInstance(session, true)) {
                    syncContext.acquire(null, Collections.singleton(metadata));

                    if (metadata.getPath() != null && Files.exists(metadata.getPath())) {

    @Test
    @DisplayName("Setters accept null and getters return null")
    void settersAcceptNull() {
        TestSpnegoToken t = new TestSpnegoToken();
        t.setMechanismToken(null);
        t.setMechanismListMIC(null);
        assertNull(t.getMechanismToken(), "mechanismToken should be null after setting null");
        assertNull(t.getMechanismListMIC(), "mechanismListMIC should be null after setting null");
    }

        DefaultLifecycleRegistry lifecycles = new DefaultLifecycleRegistry(Collections.emptyList());
        BuildPlanExecutor builder = new BuildPlanExecutor(null, null, null, null, null, null, null, null, lifecycles);
        BuildPlanExecutor.BuildContext context = builder.new BuildContext();
        return context.calculateLifecycleMappings(projects, phase);
    }

    /*
    @Test

     * StringUtil.defaultString("aaa", "NULL") = "aaa"
     * StringUtil.defaultString("aaa", null)   = "aaa"
     * StringUtil.defaultString(null, null)    = null
     * </pre>
     *
     * @param str
     *            the string (can be <code>null</code>)
     * @param defaultStr
     *            the string to return if the argument is <code>null</code> (can be <code>null</code>)

        return treeRoot == null ? null : new MetadataGraph(treeRoot);
    }
    // ----------------------------------------------------------------------------
    public MetadataGraph getGraph(ArtifactScopeEnum scope)
            throws MetadataResolutionException, GraphConflictResolutionException {
        if (treeRoot == null) {
            return null;
        }

        if (conflictResolver == null) {