fix(maven): Catch and log URL construction errors (#4572)

lib/datasource/maven/index.ts

@@ -91,10 +91,19 @@ async function downloadMavenXml(
   repoUrl: string,
   dependencyFilePath: string
 ): Promise<XmlDocument | null> {
-  const pkgUrl = new url.URL(
+  let pkgUrl;
-    `${dependency.dependencyUrl}/${dependencyFilePath}`,
+  try {
-    repoUrl
+    pkgUrl = new url.URL(
-  );
+      `${dependency.dependencyUrl}/${dependencyFilePath}`,
+      repoUrl
+    );
+  } catch (err) {
+    logger.debug(
+      { err, dependency, repoUrl, dependencyFilePath },
+      `Error constructing URL for ${dependency.display}`
+    );
+    return null;
+  }
 
   let rawContent: string;
   switch (pkgUrl.protocol) {

test/datasource/maven.spec.ts

@@ -215,7 +215,15 @@ describe('datasource/maven', () => {
       });
       expect(releases).toBeNull();
     });
-
+    it('should return null for invalid registryUrls', async () => {
+      const releases = await datasource.getPkgReleases({
+        ...config,
+        lookupName: 'mysql:mysql-connector-java',
+        // eslint-disable-next-line no-template-curly-in-string
+        registryUrls: ['${project.baseUri}../../repository/'],
+      });
+      expect(releases).toBeNull();
+    });
     it('should support scm.url values prefixed with "scm:"', async () => {
       const releases = await datasource.getPkgReleases({
         ...config,