Dynamically change the kernel startup parameters #12

Author: stariy95

README.md

@@ -138,7 +138,7 @@ To change JVM parameters use the `JJAVA_JVM_OPTS` environment variable with a st
 For example to enable assertions and set a limit on the heap size to `128m`:
 
 ```bash
-set JJ_JVM_OPTS=-ea -Xmx128m
+set JJAVA_JVM_OPTS='-ea -Xmx128m'
 ```
 
 [//]: # ( "-agentlib:jdwp=transport=dt_socket,server=y,address=5005,suspend=n",)

assembly/zip/launcher.py

@@ -6,15 +6,17 @@
 def launch_kernel():
     kernel_path = sys.argv[1]
     connection_file = sys.argv[2]
+
+    args = ['java', '--add-opens', 'jdk.jshell/jdk.jshell=ALL-UNNAMED', '-jar', kernel_path, connection_file]
+
     jvm_options = os.getenv('JJAVA_JVM_OPTS', '')
+    if jvm_options:
+        i = 0
+        for opt in jvm_options.split(' '):
+            i += 1
+            args.insert(i, opt)
 
-    subprocess.run(['java',
-                    jvm_options,
-                    '--add-opens',
-                    'jdk.jshell/jdk.jshell=ALL-UNNAMED',
-                    '-jar',
-                    kernel_path,
-                    connection_file])
+    subprocess.run(args)
 
 
 if __name__ == '__main__':