diff -r a7241e5db601 -r 0d7c7fe65638 src/Pure/Admin/component_javamail.scala
--- a/src/Pure/Admin/component_javamail.scala	Mon Jan 08 23:44:02 2024 +0100
+++ b/src/Pure/Admin/component_javamail.scala	Tue Jan 09 17:35:56 2024 +0100
@@ -1,64 +1,98 @@
 /*  Title:      Pure/Admin/component_javamail.scala
     Author:     Fabian Huch, TU Muenchen
 
-Build Isabelle javax-mail component from official download. See also:
+Build Isabelle java mail component (previously javax-mail, now jakarta + eclipse angus)
+from official downloads. See also:
+
+  - https://jakarta.ee/specifications/mail
+  - https://mvnrepository.com/artifact/jakarta.mail/jakarta.mail-api
 
-  - https://javaee.github.io/javamail/
-  - https://mvnrepository.com/artifact/javax.mail/mail
+  - https://jakarta.ee/specifications/activation
+  - https://mvnrepository.com/artifact/jakarta.activation/jakarta.activation-api
+
+  - https://eclipse-ee4j.github.io/angus-mail/
+  - https://mvnrepository.com/artifact/org.eclipse.angus/angus-mail
+
+  - https://eclipse-ee4j.github.io/angus-activation/
+  - https://mvnrepository.com/artifact/org.eclipse.angus/angus-activation
 */
 
 package isabelle
 
 
 object Component_Javamail {
+  /* jars */
+
+  sealed case class Jar(group_id: String, artifact_id: String, version: String) {
+    override def toString: String = group_id + ":" + artifact_id
+
+    def file_name: String = artifact_id + "-" + version + ".jar"
+    def maven_dir: String = group_id.replace('.', '/') + "/" + artifact_id + "/" + version
+    def url(repo_url: String): String = repo_url + "/" + maven_dir + "/" + file_name
+  }
+
+  val jars =
+    List(
+      Jar("jakarta.mail", "jakarta.mail-api", "2.1.2"),
+      Jar("jakarta.activation", "jakarta.activation-api", "2.1.2"),
+      Jar("org.eclipse.angus", "angus-mail", "2.0.2"),
+      Jar("org.eclipse.angus", "angus-activation", "2.0.1"))
+
+
   /* build javamail */
 
-  val default_download_url =
-    "https://repo1.maven.org/maven2/javax/mail/mail/1.4.7/mail-1.4.7.jar"
+  val default_download_repo = "https://repo1.maven.org/maven2"
 
   def build_javamail(
-    download_url: String = default_download_url,
+    download_repo: String = default_download_repo,
     progress: Progress = new Progress,
     target_dir: Path = Path.current
   ): Unit = {
-    val Download_Name = """^.*/([^/]+)\.jar""".r
-    val download_name =
-      download_url match {
-        case Download_Name(download_name) => download_name
-        case _ => error("Malformed jar download URL: " + quote(download_url))
-      }
-    val component_name = "java" + download_name
-
-
     /* component */
 
+    val component_name = "javamail-" + Date.Format.alt_date(Date.now())
     val component_dir =
       Components.Directory(target_dir + Path.basic(component_name)).create(progress = progress)
 
-    File.write(component_dir.LICENSE,
-      Url.read("https://raw.githubusercontent.com/javaee/javamail/master/LICENSE.txt"))
+    File.write(component_dir.LICENSE, "See the file META-INF/LICENSE.txt in each jar file.")
 
 
     /* README */
 
     File.write(component_dir.README,
-      "This is " + component_name + " from\n" + download_url +
-        "\n\nSee also https://javaee.github.io/javamail and https://mvnrepository.com/artifact/javax.mail/mail" +
-        "\n\n        Fabian\n        " + Date.Format.date(Date.now()) + "\n")
+      "This is " + component_name + " from\n" + download_repo + """
+
+See also:
+  - https://jakarta.ee/specifications/mail
+  - https://mvnrepository.com/artifact/jakarta.mail/jakarta.mail-api
+
+  - https://jakarta.ee/specifications/activation
+  - https://mvnrepository.com/artifact/jakarta.activation/jakarta.activation-api
+
+  - https://eclipse-ee4j.github.io/angus-mail/
+  - https://mvnrepository.com/artifact/org.eclipse.angus/angus-mail
+
+  - https://eclipse-ee4j.github.io/angus-activation/
+  - https://mvnrepository.com/artifact/org.eclipse.angus/angus-activation
+
+
+Fabian
+        """ + Date.Format.date(Date.now()) + "\n")
 
 
     /* settings */
 
-    component_dir.write_settings("""
-classpath "$COMPONENT/lib/""" + download_name + """.jar"
-""")
+    val settings = jars.map(jar => "\nclasspath \"$COMPONENT/lib/" + jar.file_name + "\"")
+    component_dir.write_settings(settings.mkString)
 
 
-    /* jar */
+    /* jars */
 
-    val jar = component_dir.lib + Path.basic(download_name).jar
-    Isabelle_System.make_directory(jar.dir)
-    Isabelle_System.download_file(download_url, jar, progress = progress)
+    Isabelle_System.make_directory(component_dir.lib)
+    for (jar <- jars) {
+      val path = component_dir.lib + Path.basic(jar.file_name)
+      Isabelle_System.download_file(jar.url(download_repo), path, progress = progress)
+    }
   }
 
 
@@ -69,26 +103,26 @@
       Scala_Project.here,
       { args =>
         var target_dir = Path.current
-        var download_url = default_download_url
+        var download_repo = default_download_repo
 
         val getopts = Getopts("""
 Usage: isabelle component_javamail [OPTIONS] DOWNLOAD
 
   Options are:
     -D DIR       target directory (default ".")
-    -U URL       download URL
-                 (default: """" + default_download_url + """")
+    -U URL       download repository URL
+                 (default: """" + default_download_repo + """")
 
-  Build javamail component from the specified download URL (JAR).
+  Build javamail component from the specified download repository (maven).
 """,
           "D:" -> (arg => target_dir = Path.explode(arg)),
-          "U:" -> (arg => download_url = arg))
+          "U:" -> (arg => download_repo = arg))
 
         val more_args = getopts(args)
         if (more_args.nonEmpty) getopts.usage()
 
         val progress = new Console_Progress()
 
-        build_javamail(download_url = download_url, progress = progress, target_dir = target_dir)
+        build_javamail(download_repo = download_repo, progress = progress, target_dir = target_dir)
       })
 }