}
        }
        return matches;
    }

    protected Element getChild(Element element, String childName) {
        Element child = findChild(element, childName);
        if (child != null) {
            return child;
        }
        throw new RuntimeException(String.format("No <%s> element found in <%s>", childName, element.getTagName()));
    }

     *
     * @param message The error message, may be {@code null}.
     * @param lineNumber The one-based index of the line containing the error or {@code -1} if unknown.
     * @param columnNumber The one-based index of the column containing the error or {@code -1} if unknown.
     * @param cause The nested cause of this error, may be {@code null}.
     */

                            "name": "user_id",
                            "in": "query",
                            "schema": {
                                "anyOf": [{"type": "string"}, {"type": "null"}],
                                "title": "User Id",
                            },
                        }
                    ],
                    "responses": {
                        "200": {

                "test-grp", "test-artifact", VersionRange.createFromVersion("1.0"), "type", null, "system", "provided");
        Artifact artifact2 = factory.createDependencyArtifact(
                "test-grp", "test-artifact-2", VersionRange.createFromVersion("1.0"), "type", null, "system", "test");
        Artifact artifact3 = factory.createDependencyArtifact(
                "test-grp",

    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }

        if (MetadataGraphNode.class.isAssignableFrom(obj.getClass())) {
            MetadataGraphNode node2 = (MetadataGraphNode) obj;

            if (node2.metadata == null) {
                return metadata == null;
            }

            return metadata != null && metadata.toString().equals(node2.metadata.toString());

            xml.append("    </parent>\n");
        }

        if (groupId != null) {
            xml.append("    <groupId>").append(groupId).append("</groupId>\n");
        }
        if (artifactId != null) {
            xml.append("    <artifactId>").append(artifactId).append("</artifactId>\n");
        }
        if (version != null) {
            xml.append("    <version>").append(version).append("</version>\n");
        }

    private DefaultToolchainsReader reader = new DefaultToolchainsReader();

    @Test
    void testMergeNulls() {
        merger.merge(null, null, null);

        PersistedToolchains pt = new PersistedToolchains();
        merger.merge(pt, null, null);
        merger.merge(null, pt, null);
    }

    @Test
    void testMergeJdk() throws Exception {

                                "schema": {
                                    "anyOf": [
                                        {"type": "string"},
                                        {"type": "null"},
                                    ],
                                    "title": "Fatebook Tracker",
                                },
                            },
                            {

            }
            return formatter.format(Date(0L))
        }

        val buildTimestampFromReceipt = buildTimestampFromBuildReceipt.orNull
        if (buildTimestampFromReceipt != null) {
            println("Using timestamp from incoming build receipt: $buildTimestampFromReceipt")
            return buildTimestampFromReceipt
        }

        appendReproducibleNewLine()
    }.toString()

    private
    fun String.appendOrNull(s: String?) =
        if (s == null) null else "$this$s"

    private
    fun String.dropBlankLines(): String =
        lineSequence().filter(String::isNotBlank).joinToString("\n")

    private