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Martijn Burger
Martijn Burger

Reputation: 7543

Get catalina_opts in java

How can I get all the CATALINA_OPTS and/or JAVA_OPTS parameters in a Java web app?

I know I can read System.getProperties() to get all the system properties. However, it will just show all system properties, including the -D parameters passed via CATALINA_OPTS. Not any parameters like -Xmx, -Xms, etc.

I know I can read ManagementFactory.getRuntimeMXBean() to get all the Java parameters. However, this also shows just the -D parameters. Not any parameters like -Xmx, -Xms, etc.

Upvotes: 1

Views: 2286

Answers (2)

Pete Ford
Pete Ford

Reputation: 111

Environment variables can usually be accessed through System.getenv():

String javaOpts = System.getenv("JAVA_OPTS"); // gets one value
Map<String, String> all = System.getenv(); // gets all the environment strings

Upvotes: 5

Elliott Frisch
Elliott Frisch

Reputation: 201399

If I understand your question, you can use System.getenv(String) like so

String catalinaOpts = System.getenv("CATALINA_OPTS");
String javaOpts = System.getenv("JAVA_OPTS");
System.out.printf("JAVA_OPTS = %s CATALINA_OPTS = %s%n", javaOpts, catalinaOpts);

Upvotes: 3

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