JAVA_HOME at last.

Author: dsevilla

hbase/sesion5.ipynb

@@ -52,13 +52,35 @@
     "    !sudo apt-get install -y -qq default-jdk"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Search for the first java interpreter. This code should work. If not, adjust JAVA_HOME manually.\n",
+    "import os\n",
+    "from pathlib import Path\n",
+    "\n",
+    "def find_java_home() -> str | None:\n",
+    "  p  = Path('/usr/lib/jvm')\n",
+    "  (_, dirs, _) = next(os.walk(p))\n",
+    "  for d in dirs:\n",
+    "    inner_java: Path = p / d / 'bin' / 'java'\n",
+    "    if inner_java.is_file():\n",
+    "        return str(p.joinpath(d).absolute())\n",
+    "  return None\n",
+    "\n",
+    "JAVA_HOME = os.getenv('JAVA_HOME', find_java_home())"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 3,
    "metadata": {},
    "outputs": [],
    "source": [
-    "%env JAVA_HOME=/usr/lib/jvm/default-java"
+    "%env JAVA_HOME=$JAVA_HOME"
    ]
   },
   {

hbase/sesion6.ipynb

@@ -58,7 +58,29 @@
       "metadata": {},
       "outputs": [],
       "source": [
-        "%env JAVA_HOME=/usr/lib/jvm/default-java"
+        "# Search for the first java interpreter. This code should work. If not, adjust JAVA_HOME manually.\n",
+        "import os\n",
+        "from pathlib import Path\n",
+        "\n",
+        "def find_java_home() -> str | None:\n",
+        "  p  = Path('/usr/lib/jvm')\n",
+        "  (_, dirs, _) = next(os.walk(p))\n",
+        "  for d in dirs:\n",
+        "    inner_java: Path = p / d / 'bin' / 'java'\n",
+        "    if inner_java.is_file():\n",
+        "        return str(p.joinpath(d).absolute())\n",
+        "  return None\n",
+        "\n",
+        "JAVA_HOME = os.getenv('JAVA_HOME', find_java_home())"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "%env JAVA_HOME=$JAVA_HOME"
       ]
     },
     {