diff --git a/pkgs/by-name/js/jspecify/deps.json b/pkgs/by-name/js/jspecify/deps.json
new file mode 100644
index 000000000000..c57c1108fa22
--- /dev/null
+++ b/pkgs/by-name/js/jspecify/deps.json
@@ -0,0 +1,469 @@
+{
+ "!comment": "This is a nixpkgs Gradle dependency lockfile. For more details, refer to the Gradle section in the nixpkgs manual.",
+ "!version": 1,
+ "https://plugins.gradle.org/m2": {
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+   "pom": "sha256-3Prn96stJjHK9pLazzn6yGK3GNEdCwu294+aW6gCjLo="
+  },
+  "biz/aQute/bnd#biz.aQute.bnd.gradle/7.0.0": {
+   "jar": "sha256-LMWmnBybMoqsR38mKt0K2MW8K355tbw5OWNCCl4EQhE=",
+   "pom": "sha256-x2EBfWRP4nI9Gxxlx38fGYKXT0RtqEBoianDvjp07B0="
+  },
+  "biz/aQute/bnd#biz.aQute.bnd.util/7.0.0": {
+   "jar": "sha256-OVddFQJJliqcbUbM5+Zy53fIqGIKHS0iDH8sCnmediM=",
+   "pom": "sha256-+dgDJLl2Hp3ipFoP6naPWZRH9AxuQZ8gje2MrxIYAMU="
+  },
+  "biz/aQute/bnd#biz.aQute.bndlib/7.0.0": {
+   "jar": "sha256-gKVp0AbzLpJc7kzor5Jrfm/aqqtcy/1f5MnN/5xN0t8=",
+   "pom": "sha256-mOuywO2iBtxb79bFJsjCAneApDvymekXyzwDXwOYp9I="
+  },
+  "biz/aQute/bnd#biz.aQute.repository/7.0.0": {
+   "jar": "sha256-ggIaWyICKD8J9XpW0zsh+rxvemSFC5FnNdaiZI8nYzc=",
+   "pom": "sha256-f1ar8LnsiL40/ZCDaYYdnlQwxnu6FROItbf0shvwOTU="
+  },
+  "biz/aQute/bnd#biz.aQute.resolve/7.0.0": {
+   "jar": "sha256-nVjTmv0Y/d2LTSHnC4Ui+KUmiH4UUH2UDcfK/p8NCZo=",
+   "pom": "sha256-UVIg7ZyoHFkzGz/zyuQfkUGMmn0Atavq0nEYS8rNp1Y="
+  },
+  "biz/aQute/bnd/builder#biz.aQute.bnd.builder.gradle.plugin/7.0.0": {
+   "pom": "sha256-gzK8DdCVA5r6+Tb/l4L6A3jKPvJNV+6Q++QsA3pVa9c="
+  },
+  "com/diffplug/durian#durian-collect/1.2.0": {
+   "jar": "sha256-sZTAuIAhzBFsIcHcdvScLB/hda9by3TIume527+aSMw=",
+   "pom": "sha256-i7diCGoKT9KmRzu/kFx0R2OvodWaVjD3O7BLeHLAn/M="
+  },
+  "com/diffplug/durian#durian-core/1.2.0": {
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+   "pom": "sha256-hwMg6QdVNxsBeW/oG6Ul/R3ui3A0b1VFUe7dQonwtmI="
+  },
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+   "pom": "sha256-NQkZQkMk4nUKPdwvobzmqQrIziklaYpgqbTR1uSSL/4="
+  },
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+   "module": "sha256-rVlQLGknZu48M0vkliigDctNka4aSPJjLitxUStDXPk=",
+   "pom": "sha256-GzxJFP1eLM4pZq1wdWY5ZBFFwdNCB3CTV4Py3yY2kIU="
+  },
+  "com/diffplug/spotless#com.diffplug.spotless.gradle.plugin/6.25.0": {
+   "pom": "sha256-9FyCsS+qzYWs1HTrppkyL6XeqIQIskfQ5L3pQSkIIjo="
+  },
+  "com/diffplug/spotless#spotless-lib-extra/2.45.0": {
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+   "pom": "sha256-5x2LkRDdSNLn9KVLi/uozlWpbmteu9T0OpJGZJz1b7A="
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+   "module": "sha256-+x+8+TUAczrHWcp99E8P9mVTEze0LaAS4on/CINNiQ8=",
+   "pom": "sha256-WKd8IsQLIc8m29tCEwFu9HrM9bBwchfHkyqQ9D+PMNw="
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+   "pom": "sha256-q1ZuPYS2w/rHqPySXy279TzZdZywOvPAfQ3EN9OXqNo="
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+   "pom": "sha256-9EzGPWEvA7Hb/IKJLc2zL9t1vxYEn9hZVWHnx6M7xFE="
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+   "pom": "sha256-IoCOu0t12MQDfZzuEgitxlvHgqmIVzIjSjG3tXTF2Qw="
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+   "pom": "sha256-fd8NZzuvE+4XBkng91ll/M40v8Hd01UQ5iyY2MUH3Us="
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+  },
+  "org/sonatype/oss#oss-parent/7": {
+   "pom": "sha256-tR+IZ8kranIkmVV/w6H96ne9+e9XRyL+kM5DailVlFQ="
+  },
+  "org/tukaani#xz/1.9": {
+   "jar": "sha256-IRswbPxE+Plt86Cj3a91uoxSie7XfWDXL4ibuFX1NeU=",
+   "pom": "sha256-CTvhsDMxvOKTLWglw36YJy12Ieap6fuTKJoAJRi43Vo="
+  }
+ },
+ "https://repo.maven.apache.org/maven2": {
+  "aopalliance#aopalliance/1.0": {
+   "jar": "sha256-Ct3sZw/tzT8RPFyAkdeDKA0j9146y4QbYanNsHk3agg=",
+   "pom": "sha256-JugjMBV9a4RLZ6gGSUXiBlgedyl3GD4+Mf7GBYqppZs="
+  },
+  "com/github/ben-manes/caffeine#caffeine/3.0.5": {
+   "jar": "sha256-iptU01BqO5LuRrIXvO55GWshym1S3ClnxoaiBfsvnBU=",
+   "module": "sha256-MNqUAgRzgsSZ0djzcgH8Ead8mTTSxYa8WkKvrEr6wrI=",
+   "pom": "sha256-vM/bJH7Xa1K7sUMMIoLEO61BjtPGl7TiqVrQmbvyXPg="
+  },
+  "com/github/kevinstern#software-and-algorithms/1.0": {
+   "jar": "sha256-YauCQ5zvNzQ7FPUxVMRhYZN1NzpWuTOOiVcJ+1Tghkw=",
+   "pom": "sha256-7ZcfAJNU5owJQUyWT74aLIXCyLvUYBIrdJenuMXU84g="
+  },
+  "com/google#google/5": {
+   "pom": "sha256-4J00XnPKP7yn8+BfMN63Tp053Wt5qT/ujFEfI0F7aCg="
+  },
+  "com/google/auto#auto-common/1.2.1": {
+   "jar": "sha256-9D8p/ipuuvBLJZjN7sMqTjRtSalATpkPX8GcGfOijQ4=",
+   "pom": "sha256-E7S1AGKUn4sTQ5J8WBU207sFG4r+pQmqb5AvTeKLwbI="
+  },
+  "com/google/auto/service#auto-service-aggregator/1.0.1": {
+   "pom": "sha256-BIFGDbWZAzYrJvq9O9zV7CAHUPk5G7tlAv48fcLfPkw="
+  },
+  "com/google/auto/service#auto-service-annotations/1.0.1": {
+   "jar": "sha256-x77FS3tViLWWfocDQQkcVpEYHZVM8gOfG/Cm7rg3Rzs=",
+   "pom": "sha256-6bvxs9ZsoYAEpqB6INv6EMos6DZzSPdB3i/o/vzmjMI="
+  },
+  "com/google/auto/value#auto-value-annotations/1.9": {
+   "jar": "sha256-+lRp9MRO5Zii2PAzqwqdy8ZJigxeDJmN+gwq31E1gEQ=",
+   "pom": "sha256-kiCj2r51x5M08GGw5A34M0SGZrrCiouCO8Ho/VL4yYo="
+  },
+  "com/google/auto/value#auto-value-parent/1.9": {
+   "pom": "sha256-Lj2d/2OWAcq4gdfhcIBry9jgMffr/yWcu0W+V7TL14c="
+  },
+  "com/google/code/findbugs#jsr305/3.0.2": {
+   "jar": "sha256-dmrSoHg/JoeWLIrXTO7MOKKLn3Ki0IXuQ4t4E+ko0Mc=",
+   "pom": "sha256-GYidvfGyVLJgGl7mRbgUepdGRIgil2hMeYr+XWPXjf4="
+  },
+  "com/google/errorprone#error_prone_annotation/2.20.0": {
+   "jar": "sha256-vxzaySKIajd7p3JCooEo9+tADXxzyQXff7p26qw1fmc=",
+   "pom": "sha256-IiHmp48/e26RUynjfoKk1oKEKxWuKM9yukunHMBoKTE="
+  },
+  "com/google/errorprone#error_prone_annotations/2.20.0": {
+   "jar": "sha256-oTbT3OZxaNiHURFfoiO+yA6ubMBiqi+Bc+g0SpgjXsQ=",
+   "pom": "sha256-lPUGU69lm+HRoNeF+Xy6doVx95TS5lX8PSLk7uZRKzk="
+  },
+  "com/google/errorprone#error_prone_check_api/2.20.0": {
+   "jar": "sha256-thTVZZmyzoi8lmEdiUO3RlchSjJV3r5euDoLldal+Zc=",
+   "pom": "sha256-BbHZZjPswo4T2Wjcco+CO9MCyuEoeOQxiOSe3fGP9bo="
+  },
+  "com/google/errorprone#error_prone_core/2.20.0": {
+   "jar": "sha256-noHXvKX6GDtUBZ/Kx0+949/u3kY5Dn46F+4Lxm2ERxM=",
+   "pom": "sha256-yoqZNJJyasGFAEokY9RSdOJk9VxtcUEaw30yc9sTFeE="
+  },
+  "com/google/errorprone#error_prone_parent/2.20.0": {
+   "pom": "sha256-4Li8d/x5TSLVCqSFGJbYICphZhAWGxPL/yoUj/HhAsI="
+  },
+  "com/google/errorprone#error_prone_type_annotations/2.20.0": {
+   "jar": "sha256-MNugplH9X7qPyugfkpOMWQIwMA+SZeqEn0MUlPf5LBY=",
+   "pom": "sha256-1r8/bVHn1ynBmTMkZtVp3Gay7yHuwSnD0aC4kSDYzz8="
+  },
+  "com/google/errorprone#javac/9+181-r4173-1": {
+   "jar": "sha256-HY00eg4VefP8hqwE0ZdOSJr8ZjV/AAmsmASnrDCRLtY=",
+   "pom": "sha256-FWnAgfqDWKBhZDcvn1Qbig6l7Alkkx9fdOrTb/UrQBU="
+  },
+  "com/google/guava#failureaccess/1.0.1": {
+   "jar": "sha256-oXHuTHNN0tqDfksWvp30Zhr6typBra8x64Tf2vk2yiY=",
+   "pom": "sha256-6WBCznj+y6DaK+lkUilHyHtAopG1/TzWcqQ0kkEDxLk="
+  },
+  "com/google/guava#guava-parent/26.0-android": {
+   "pom": "sha256-+GmKtGypls6InBr8jKTyXrisawNNyJjUWDdCNgAWzAQ="
+  },
+  "com/google/guava#guava-parent/31.1-jre": {
+   "pom": "sha256-RDliZ4O0StJe8F/wdiHdS7eWzE608pZqSkYf6kEw4Pw="
+  },
+  "com/google/guava#guava/31.1-jre": {
+   "jar": "sha256-pC7cnKt5Ljn+ObuU8/ymVe0Vf/h6iveOHWulsHxKAKs=",
+   "pom": "sha256-kZPQe/T2YBCNc1jliyfSG0TjToDWc06Y4hkWN28nDeI="
+  },
+  "com/google/guava#listenablefuture/9999.0-empty-to-avoid-conflict-with-guava": {
+   "jar": "sha256-s3KgN9QjCqV/vv/e8w/WEj+cDC24XQrO0AyRuXTzP5k=",
+   "pom": "sha256-GNSx2yYVPU5VB5zh92ux/gXNuGLvmVSojLzE/zi4Z5s="
+  },
+  "com/google/inject#guice-parent/5.1.0": {
+   "pom": "sha256-Y9XAxkF5feumwFHEfV9pI/OhA+9x5OvDqF0Bw+h4WWw="
+  },
+  "com/google/inject#guice/5.1.0": {
+   "jar": "sha256-QTDlC/rEgJnIYPDZA7kYYMgaJJyQ84JF+P7Vj8gXvCY=",
+   "pom": "sha256-s7jcZSE9Yj+3DteVjb3WFjJCVrqDajFlJWDDiJmf2c0="
+  },
+  "com/google/j2objc#j2objc-annotations/1.3": {
+   "jar": "sha256-Ia8wySJnvWEiwOC00gzMtmQaN+r5VsZUDsRx1YTmSns=",
+   "pom": "sha256-X6yoJLoRW+5FhzAzff2y/OpGui/XdNQwTtvzD6aj8FU="
+  },
+  "com/google/protobuf#protobuf-bom/3.19.6": {
+   "pom": "sha256-8tqbt1IIO0yJDV69ZjFMRyb1M67+dvbCQn6dcfKIIxE="
+  },
+  "com/google/protobuf#protobuf-java/3.19.6": {
+   "jar": "sha256-apot/5Hc9x+FvnGulx9hZLWmMdzTS/8I8GGFNcpErQI=",
+   "pom": "sha256-0QlO6w21FqBQC7C+xZATbmBoqD0P94K3wcdxqeidHaQ="
+  },
+  "com/google/protobuf#protobuf-parent/3.19.6": {
+   "pom": "sha256-rM3kgjBu27qah3rfuxBoD+pME2tueX5TupuEaeolqlw="
+  },
+  "io/github/eisop#dataflow-errorprone/3.34.0-eisop1": {
+   "jar": "sha256-ibT10r1QWfBnxZgqDlmIuH38ioI0eV1oxvMXiEbeMxk=",
+   "pom": "sha256-JaaDYJh6NnhrrYk/EEAXAM1iVkRhR0wdosukpTmpzgY="
+  },
+  "io/github/java-diff-utils#java-diff-utils/4.0": {
+   "jar": "sha256-gQIyN052qVSUnw4hhc19lRWt25GM89o0gfd+B8NWtJo=",
+   "pom": "sha256-ujdnHK74ki0M+eDt8437+8a8ztiRbD1XWzdYp+wog0c="
+  },
+  "javax/inject#javax.inject/1": {
+   "jar": "sha256-kcdwRKUMSBY2wy2Rb9ickRinIZU5BFLIEGUID5V95/8=",
+   "pom": "sha256-lD4SsQBieARjj6KFgFoKt4imgCZlMeZQkh6/5GIai/o="
+  },
+  "org/apiguardian#apiguardian-api/1.1.0": {
+   "pom": "sha256-qUW5y1zZt3sscRhE5lnEPsBw71nZ9Qn6n0wYYbSGJxE="
+  },
+  "org/apiguardian#apiguardian-api/1.1.2": {
+   "jar": "sha256-tQlEisUG1gcxnxglN/CzXXEAdYLsdBgyofER5bW3Czg=",
+   "module": "sha256-4IAoExN1s1fR0oc06aT7QhbahLJAZByz7358fWKCI/w=",
+   "pom": "sha256-MjVQgdEJCVw9XTdNWkO09MG3XVSemD71ByPidy5TAqA="
+  },
+  "org/checkerframework#checker-qual/3.12.0": {
+   "module": "sha256-0EeUnBuBCRwsORN3H6wvMqL6VJuj1dVIzIwLbfpJN3c=",
+   "pom": "sha256-d1t6425iggs7htwao5rzfArEuF/0j3/khakionkPRrk="
+  },
+  "org/checkerframework#checker-qual/3.19.0": {
+   "jar": "sha256-qCfEkYPzpjInfSegpGc2hss0FQdEe51XAmEJS9dIqmg=",
+   "module": "sha256-U+GJnd48UTyh79N2q/+sDmkH6OhKvV+WYkJjTJXk0Vc=",
+   "pom": "sha256-KbqcXOGpS3AL2CPE7WEvWCe1kPGaSXdf1+uPmX+Ko3E="
+  },
+  "org/eclipse/jgit#org.eclipse.jgit-parent/4.4.1.201607150455-r": {
+   "pom": "sha256-p3SkgFVcUSpqo47j/00FmVTUeLvh6QB9zRFdz4CaGKM="
+  },
+  "org/eclipse/jgit#org.eclipse.jgit/4.4.1.201607150455-r": {
+   "jar": "sha256-CyRHsyToY1HjXgjgkUNhlKhG1GnXnpdkQ5hTPHPQH+A=",
+   "pom": "sha256-SCeAj6Q/+4NN512OpzT0ImVPlFwxtM/+P7xdWjepUIk="
+  },
+  "org/junit#junit-bom/5.7.0": {
+   "module": "sha256-Jd5FSzrdZ2VNZpG1PedZO1ApZ7X/VJVHsQTXlh8aUr0=",
+   "pom": "sha256-NfsV+NC+4rWQCiKDJ2I2ZVL5o0nFbO1guhI85Hc4/wA="
+  },
+  "org/junit#junit-bom/5.9.3": {
+   "module": "sha256-tAH9JZAeWCpSSqU0PEs54ovFbiSWHBBpvytLv87ka5M=",
+   "pom": "sha256-TQMpzZ5y8kIOXKFXJMv+b/puX9KIg2FRYnEZD9w0Ltc="
+  },
+  "org/junit/jupiter#junit-jupiter-api/5.9.3": {
+   "jar": "sha256-2JXj7t9PobEN4xqRvlWjAbswe/GO8yWz+l2z+A7pLRw=",
+   "module": "sha256-ba7jABTiBFWh7MbW0LOsYERECtE+9CA5jikZCYDpuHo=",
+   "pom": "sha256-f3KVZWK+1JEdMhf5DeCw0kDdklb4V99aJLvrAVS0FBs="
+  },
+  "org/junit/jupiter#junit-jupiter-engine/5.9.3": {
+   "jar": "sha256-tV4wSxzS6PEWwat3pdw+yoxNm0amnghLY6ylHN61Xw8=",
+   "module": "sha256-lY9TIPRbNNCmZ24W/1ScsBDhQm3KUs/bEFh2vM9Pdog=",
+   "pom": "sha256-D1/XZ2n95tJHMI+Dbf8TTItS9lpC5UuNCtoEFvMKc3o="
+  },
+  "org/junit/platform#junit-platform-commons/1.9.3": {
+   "jar": "sha256-hRkVffgTwhDoX8FBS3QQnj2F9D1wklY+1wTEPEjw1eY=",
+   "module": "sha256-eWpB8nJB+2dgjwGazPTBw2cVe3MjinavhvbeuuNZnrQ=",
+   "pom": "sha256-4Xof3keC8vwjtC3sp1wLBWbVwphQ0DBr5lxdpzuAIXg="
+  },
+  "org/junit/platform#junit-platform-engine/1.9.3": {
+   "jar": "sha256-DDlVPZoDUQdXIn9aHGzGUwKHsaMh7WJYRQZkh0qioWo=",
+   "module": "sha256-nQVThnLcRrITlxJjbv3B8Xg9Q5qhwktp0Ckrgci36o8=",
+   "pom": "sha256-HFq3/OvjpgEYOXm6r78vQOVUOIKnyiPp+etxkZWnR9U="
+  },
+  "org/junit/platform#junit-platform-launcher/1.7.0": {
+   "module": "sha256-zpTSugJQT8kavcC3lzUOUlKHGdBJ7swEOCh+yVuWS6Q=",
+   "pom": "sha256-JNBcKPWp6tLAZ4/REnnqgfHLfvnUY0QdkQT60VADgpo="
+  },
+  "org/junit/platform#junit-platform-launcher/1.9.3": {
+   "jar": "sha256-hRXpGAignIya9eNZGFtZkbXna4rc8YW5o9q07I5bqP8=",
+   "module": "sha256-RbWyPx6RsuZm2Z8Mk1V7bdL2ffBiftKaZpKws4hfGa0=",
+   "pom": "sha256-C3zLRCXoIJoDNc+D1jzDZyv42REMaWbv55d9EWZkjyc="
+  },
+  "org/opentest4j#opentest4j/1.2.0": {
+   "jar": "sha256-WIEt5giY2Xb7ge87YtoFxmBMGP1KJJ9QRCgkefwoavI=",
+   "pom": "sha256-qW5nGBbB/4gDvex0ySQfAlvfsnfaXStO4CJmQFk2+ZQ="
+  },
+  "org/pcollections#pcollections/3.1.4": {
+   "jar": "sha256-NPV5ugdcjaLIoP7dDwTiHqwvtsZg2Q0Pq7Vz6LTcaRg=",
+   "pom": "sha256-umQabIK+0ira2CImO960nS1/iE1NQg2hXAPEJMajjB8="
+  },
+  "org/sonatype/oss#oss-parent/7": {
+   "pom": "sha256-tR+IZ8kranIkmVV/w6H96ne9+e9XRyL+kM5DailVlFQ="
+  },
+  "org/sonatype/oss#oss-parent/9": {
+   "pom": "sha256-+0AmX5glSCEv+C42LllzKyGH7G8NgBgohcFO8fmCgno="
+  }
+ }
+}
diff --git a/pkgs/by-name/js/jspecify/package.nix b/pkgs/by-name/js/jspecify/package.nix
index 9cd7fbff736c..1cfc2178590f 100644
--- a/pkgs/by-name/js/jspecify/package.nix
+++ b/pkgs/by-name/js/jspecify/package.nix
@@ -1,34 +1,63 @@
 {
   lib,
-  stdenvNoCC,
-  fetchMavenArtifact,
+  stdenv,
+  fetchFromGitHub,
+  writeShellScript,
+  nix-update,
+  gradle,
+  jdk21,
   jre_minimal,
 }:
 
-stdenvNoCC.mkDerivation (finalAttrs: {
+stdenv.mkDerivation (finalAttrs: {
   pname = "jspecify";
   version = "1.0.0";
 
-  src = fetchMavenArtifact {
-    groupId = "org.jspecify";
-    artifactId = "jspecify";
-    version = finalAttrs.version;
-    hash = "sha256-H61ua+dVd4Hk0zcp1Jrhzcj92m/kd7sMxozjUer9+6s=";
+  src = fetchFromGitHub {
+    owner = "jspecify";
+    repo = "jspecify";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-WgVRaGm9lYhMeMM6QWUezXtUsXkaK/iPt1gj2koWNu8=";
   };
 
+  nativeBuildInputs = [
+    gradle
+    jdk21
+  ];
+
+  mitmCache = gradle.fetchDeps {
+    inherit (finalAttrs) pname;
+    data = ./deps.json;
+  };
+
+  # JSpecify's build.gradle reads JAVA_VERSION (defaults to 11). Pin it so Gradle's
+  # toolchain machinery resolves to the JDK we provide instead of trying
+  # to auto-download one.
+  env.JAVA_VERSION = lib.versions.major jdk21.version;
+
+  gradleBuildTask = "assemble";
+
+  doCheck = true;
+
   installPhase = ''
     runHook preInstall
 
-    install -Dm444 ${finalAttrs.src.jar} $out/share/java/${finalAttrs.pname}-${finalAttrs.version}.jar
+    install -Dm644 build/libs/jspecify-${finalAttrs.version}.jar \
+      $out/share/java/jspecify-${finalAttrs.version}.jar
 
     runHook postInstall
   '';
 
+  passthru.updateScript = writeShellScript "update-jspecify" ''
+    ${lib.getExe nix-update} jspecify
+    $(nix-build -A jspecify.mitmCache.updateScript)
+  '';
+
   meta = {
     homepage = "https://jspecify.dev";
     description = "Standard Annotations for Java Static Analysis";
     license = lib.licenses.asl20;
-    sourceProvenance = with lib.sourceTypes; [ binaryBytecode ];
+    sourceProvenance = with lib.sourceTypes; [ fromSource ];
     inherit (jre_minimal.meta) platforms;
     maintainers = with lib.maintainers; [ msgilligan ];
   };